Patent ID: 11929833
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 20:
21. A wireless device for a cellular communications network enabled to transmit autonomous uplink transmissions in an unlicensed spectrum, the wireless device comprising:
at least one processor, memory and transceiver collectively configured to:
perform autonomous uplink transmissions in the unlicensed spectrum for one or more HARQ processes;
receive, from a network node, HARQ feedback comprising a bit map of a set of all HARQ processes configured for at least one cell and a corresponding bit acknowledgement mapped to each configured HARQ process;
in response to determining that no HARQ feedback for a predetermined autonomous uplink transmission is received from the network node within a predetermined time period, retransmit the predetermined autonomous uplink transmission;
use a timer to determine a number of subframes since an initial transmission of the predetermined autonomous uplink transmission; and
perform retransmission in response to the timer exceeding a configured threshold.