METHOD OF ACCESS AND LINK ADAPTATION FOR COVERAGE ENHANCED WIRELESS TRANSMISSIONS

摘要

Coverage enhancement of channels in a wireless communication system such as Long Term Evolution (LTE) and LTE-Advanced (LTE-A). Coverage enhancement may include repetition of a channel in the time and/or frequency domain, power boosting of the channel, and reference signal improvement for better channel estimation accuracy. Link adaptation techniques are described, where the link adaptation is dependent on a coverage enhancement (CE) or repetition level. An example method for link adaptation in a Wireless Transmit/Receive Unit (WTRU) in coverage enhancement (CE) mode includes determining the number of repetitions for an uplink channel, deriving the transmission power for the uplink channel based on the number of repetitions, and transmitting the channel with the determined number of repetitions at the transmission power level. Link adaptation based on CE level or repetition level is described for uplink and downlink channels including data, control, access, and broadcast channels.