Repetition-based uplink for low latency communications in a new radio wireless communication system
A method and apparatus for enabling repetitive transmissions for low latency systems is disclosed. For example, a base station may determine whether an uplink coverage parameter for a UE communicating with the network entity on an uplink communication channel satisfies an uplink coverage threshold, and transmit an activation message for repetition-based uplink communications to the UE based on a determination that the uplink coverage parameter for the UE communicating with the network entity on the uplink communication channel satisfies the uplink coverage threshold. Further, a UE may receive an activation message for repetition-based uplink communications from a network entity, and perform repetitive transmissions on the uplink communication channel for the duration indicated by the one or more transmission parameters in the activation message, the repetitive transmissions being configured based on the uplink sTTI pattern.
1. An apparatus for wireless communications, comprising:
a modem;
a memory; and
one or more processors, the memory and the one or more processors, in conjunction with the modem being configured to:
receive an activation message from a network entity, the activation message comprising one or more transmission parameters,
a duration for transmissions on an uplink communication channel and an uplink short Transmission Time Interval (sTTI) pattern for the transmissions on the uplink communication channel being indicated by the one or more transmission parameters;
perform repetitive transmissions on the uplink communication channel for the duration and based on the uplink sTTI pattern, the duration comprising a number of sTTIs for the repetitive transmissions in one or more subframes, the repetitive transmissions being performed in two or more subframes, one of the number of sTTIs comprising two symbols;
transmit a Demodulation Reference Signal (DMRS) within each of the one or more subframes based on the one or more transmission parameters; and
receive a configuration message, the configuration message comprising one or more configuration parameters,
the duration being further indicated the one or more configuration parameters,
the activation message being included within a downlink control information (DCI) message, and
the configuration message being included within a Radio Resource Control (RRC) message.
2. A method for wireless communication at a user equipment (UE), comprising:
receiving an activation message from a network entity, the activation message comprising one or more transmission parameters,
a duration for transmissions on an uplink communication channel and an uplink short Transmission Time Interval (sTTI) pattern for the transmissions on the uplink communication channel being indicated by the one or more transmission parameters;
performing repetitive transmissions on the uplink communication channel for the duration and based on the uplink sTTI pattern, the duration comprising a number of sTTIs for the repetitive transmissions in one or more subframes, the repetitive transmissions being performed in two or more subframes, one of the number of sTTIs comprising two symbols;
transmitting a Demodulation Reference Signal (DMRS) within each of the one or more subframes based on the one or more transmission parameters; and
receiving a configuration message, the configuration message comprising one or more configuration parameters,
the duration being further indicated the one or more configuration parameters,
the activation message being included within a downlink control information (DCI) message, and
the configuration message being included within a Radio Resource Control (RRC) message.
3. An apparatus for wireless communications, comprising:
a memory;
a modem; and
one or more processors, the one or more processors and the memory, in conjunction with the modem, are configured to:
transmit an activation message, the activation message comprising one or more transmission parameters,
a duration for transmissions on an uplink communication channel and an uplink short Transmission Time Interval (sTTI) pattern for the transmissions on the uplink communication channel being indicated by the one or more transmission parameters;
receive repetitive transmissions on the uplink communication channel for the duration and based on the uplink sTTI pattern, the duration comprising a number of sTTIs for the repetitive transmissions in one or more subframes, the repetitive transmissions being performed in two or more subframes, one of the number of sTTIs comprising two symbols, the one or more subframes further comprising within each of the one or more subframes a Demodulation Reference Signal (DMRS) based on the one or more transmission parameters; and
transmit a configuration message, the configuration message comprising one or more configuration parameters,
the duration being further indicated the one or more configuration parameters,
the activation message being included within a downlink control information (DCI) message, and
the configuration message being included within a Radio Resource Control (RRC) message.