Method and apparatus of retransmission using adjacent configured grant resource in wireless communications systems
A communication method and a system for converging a 5th generation (5G) communication system for supporting higher data rates beyond a 4th generation (4G) system with an Internet of things (IoT) technology are provided. The communication method includes intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety-related services.
1. A method performed by a terminal in a communication system, the method comprising:
receiving, from a base station, a radio resource control (RRC) message including configured grant configuration information;
identifying a configured uplink grant being prioritized over another uplink grant based on the configured grant configuration information;
identifying a hybrid automatic repeat request (HARQ) process associated with the configured uplink grant;
considering that a medium access control (MAC) protocol data unit (PDU) to transmit has been obtained for the HARQ process, in case that a previous configured uplink grant for the HARQ process was not prioritized, the MAC PDU had already been obtained for the HARQ process, and a transmission of the obtained MAC PDU has not been completely performed; and
transmitting, to the base station, the MAC PDU for the HARQ process based on the configured uplink grant, without obtaining the MAC PDU from an HARQ buffer of the HARQ process.
2. The method of claim 1 , wherein the configured grant configuration information includes at least one of information on a frequency hopping, information on a modulation and coding scheme (MCS) table, information on a resource allocation type, information indicating whether a power control loop is used, information on a periodicity, information on a configured grant timer value, or information on a number of one or more HARQ processes.
3. The method of claim 2 , further comprising starting or restarting a configured grant timer for the HARQ process based on the configured grant timer value.
4. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller configured to:
receive, from a base station via the transceiver, a radio resource control (RRC) message including configured grant configuration information,
identify a configured uplink grant being prioritized over another uplink grant based on the configured grant configuration information,
identify a hybrid automatic repeat request (HARQ) process associated with the configured uplink grant,
consider that a medium access control (MAC) protocol data unit (PDU) to transmit has been obtained for the HARQ process, in case that a previous configured uplink grant for the HARQ process was not prioritized, the MAC PDU had already been obtained for the HARQ process, and a transmission of the obtained MAC PDU has not been completely performed, and
transmit, to the base station via the transceiver, the MAC PDU for the HARQ process based on the configured uplink grant, without obtaining the MAC PDU from an HARQ buffer of the HARQ process.
5. The terminal of claim 4 , wherein the configured grant configuration information includes at least one of information on a frequency hopping, information on a modulation and coding scheme (MCS) table, information on a resource allocation type, information indicating whether a power control loop is used, information on a periodicity, information on a configured grant timer value, or information on a number of one or more HARQ processes.
6. The terminal of claim 5 , wherein the controller is further configured to start or restart a configured grant timer for the HARQ process based on the configured grant timer value.