CPC H04W 74/0808 (2013.01) [H04W 72/23 (2023.01)] | 20 Claims |
1. A method comprising:
receiving, by a wireless device, radio resource control (RRC) messages comprising configuration parameters of a plurality of carriers of an unlicensed cell, wherein the plurality of carriers comprise a downlink carrier and two or more uplink carriers comprising a normal uplink carrier and a supplementary uplink carrier;
determining a first contention window for a first listen before talk (LBT) procedure for a first channel of the normal uplink carrier;
based on switching from the normal uplink carrier to the supplementary uplink carrier, determining a second contention window to be a minimum contention window, of a plurality of contention windows, for a second LBT procedure of a second channel of the supplementary uplink carrier; and
transmitting, via the supplementary uplink carrier, a transport block based on the second LBT procedure using the second contention window.
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