Sounding reference signal configuration and transport block size scaling in low latency systems

A method for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, comprising:

• transmitting an indication of a first configuration for sounding reference signal (SRS) transmissions during TTIs having the first TTI duration and an indication of a second configuration for SRS transmissions during TTIs having the second TTI duration;
• receiving an SRS during a TTI, wherein a configuration of the SRS is based at least in part on either the first configuration or the second configuration;
• and
• determining at least a channel quality of a channel used to transmit data during the TTI based at least in part on the SRS.

A method for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, comprising:

• identifying data to transmit during a TTI having the first TTI duration;
• determining a number of resource elements available for transmission of the data during the TTI having the first TTI duration;
• and
• determining a transport block size (TBS) for transmission of the data during the TTI having the first TTI duration based at least in part on the determined number of resource elements available for transmission of the data during the TTI having the first TTI duration.

An apparatus for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, comprising:

• means for receiving a grant in downlink control information (DCI) or shortened DCI (sDCI);
• means for identifying a sounding reference signal (SRS) to be transmitted based at least in part on receiving the grant;
• means for determining a configuration for the SRS based at least in part on the grant being received in the DCI or the sDCI;
• and
• means for transmitting the SRS during a TTI having the first TTI duration or a TTI having the second TTI duration based at least in part on the configuration.

An apparatus for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, comprising:

• means for transmitting an indication of a first configuration for sounding reference signal (SRS) transmissions during TTIs having the first TTI duration and an indication of a second configuration for SRS transmissions during TTIs having the second TTI duration;
• means for receiving an SRS during a TTI, wherein a configuration of the SRS is based at least in part on either the first configuration or the second configuration;
• and
• means for determining at least a channel quality of a channel used to transmit data during the TTI based at least in part on the SRS.

An apparatus for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, comprising:

• means for identifying data to transmit during a TTI having the first TTI duration;
• means for determining a number of resource elements available for transmission of the data during the TTI having the first TTI duration;
• and
• means for determining a transport block size (TBS) for transmission of the data during the TTI having the first TTI duration based at least in part on the determined number of resource elements available for transmission of the data during the TTI having the first TTI duration.

A mobile device for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• receive a grant in downlink control information (DCI) or shortened DCI (sDCI);
• identify a sounding reference signal (SRS) to be transmitted based at least in part on receiving the grant;
• determine a configuration for the SRS based at least in part on the grant being received in the DCI or the sDCI;
• and
• transmit the SRS during a TTI having the first TTI duration or a TTI having the second TTI duration based at least in part on the configuration.

A network device for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• transmit an indication of a first configuration for sounding reference signal (SRS) transmissions during TTIs having the first TTI duration and an indication of a second configuration for SRS transmissions during TTIs having the second TTI duration;
• receive an SRS during a TTI, wherein a configuration of the SRS is based at least in part on either the first configuration or the second configuration;
• and
• determine at least a channel quality of a channel used to transmit data during the TTI based at least in part on the SRS.

An apparatus for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• identify data to transmit during a TTI having the first TTI duration;
• determine a number of resource elements available for transmission of the data during the TTI having the first TTI duration;
• and
• determine a transport block size (TBS) for transmission of the data during the TTI having the first TTI duration based at least in part on the determined number of resource elements available for transmission of the data during the TTI having the first TTI duration.

A non-transitory computer readable medium storing code for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, the code comprising instructions executable by a processor to:

• receive a grant in downlink control information (DCI) or shortened DCI (sDCI);
• identify a sounding reference signal (SRS) to be transmitted based at least in part on receiving the grant;
• determine a configuration for the SRS based at least in part on the grant being received in the DCI or the sDCI;
• and
• transmit the SRS during a TTI having the first TTI duration or a TTI having the second TTI duration based at least in part on the configuration.

A non-transitory computer readable medium storing code for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, the code comprising instructions executable by a processor to:

• transmit an indication of a first configuration for sounding reference signal (SRS) transmissions during TTIs having the first TTI duration and an indication of a second configuration for SRS transmissions during TTIs having the second TTI duration;
• receive an SRS during a TTI, wherein a configuration of the SRS is based at least in part on either the first configuration or the second configuration;
• and
• determine at least a channel quality of a channel used to transmit data during the TTI based at least in part on the SRS.

A non-transitory computer readable medium storing code for wireless communication in a system that supports a first transmission time interval (TTI) duration and a second TTI duration that is greater than the first TTI duration, the code comprising instructions executable by a processor to:

• identify data to transmit during a TTI having the first TTI duration;
• determine a number of resource elements available for transmission of the data during the TTI having the first TTI duration;
• and
• determine a transport block size (TBS) for transmission of the data during the TTI having the first TTI duration based at least in part on the determined number of resource elements available for transmission of the data during the TTI having the first TTI duration.