Method of prioritizing random access for multimedia priority and mission critical services and apparatus thereof

Abstract

A communication method and system for converging a 5th generation (5G) communication system for supporting higher data rates beyond a 4th generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system includes intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The method includes receiving and selectively applying at least one of a first set of random access prioritization parameters, a second set of random access prioritization parameters, or a third set of random access prioritization parameters, based on whether a random access procedure is initiated for beam failure recovery or handover.

What is claimed is: 
     
         1 . A method performed by a first terminal in a wireless communication system, the method comprising:
 identifying whether a hybrid automatic repeat request (HARQ) feedback is enabled for a groupcast;   identifying whether a number of candidate physical sidelink feedback channel (PSFCH) resources associated with a sidelink grant is greater than or equal to a group size, in case that the HARQ feedback is enabled for the groupcast;   selecting either a positive-negative acknowledgement or a negative-only acknowledgement, in case that the number of the candidate PSFCH resources associated with the sidelink grant is greater than or equal to the group size; and   transmitting, to a second terminal, sidelink control information (SCI) indicating that the HARQ feedback is enabled and a result of a selection.   
     
     
         2 . The method of  claim 1 , further comprising:
 selecting the negative-only acknowledgement, in case that the group size is greater than the number of the candidate PSFCH resources associated with the sidelink grant; and   transmitting, to the second terminal, the SCI indicating that the HARQ feedback is enabled and the negative-only acknowledgement.   
     
     
         3 . The method of  claim 1 , wherein, in case that the negative-only acknowledgement is selected, only a HARQ negative-acknowledgment (NACK) is received from the second terminal when a data is not successfully decoded by the second terminal. 
     
     
         4 . The method of  claim 1 , wherein the group size corresponded to a number of group members for the groupcast. 
     
     
         5 . A method performed by a second terminal in a wireless communication system, the method comprising:
 receiving, sidelink control information (SCI) indicating that a hybrid automatic repeat request (HARQ) feedback is enabled;   identifying whether a negative-only acknowledgement is indicated by the SCI;   identifying whether second terminal location information is available; and   transmitting a negative acknowledgement for a data which is not successfully decoded, in case that the negative-only acknowledgement is indicated by the SCI and the second terminal location information is not available.   
     
     
         6 . The method of  claim 5 , further comprising:
 identifying a distance between a first terminal and the second terminal, in case that the negative-only acknowledgement is indicated by the SCI and the second terminal location information is available,   wherein the negative acknowledgement for the data which is not successfully decoded is transmitted based on the identified distance.   
     
     
         7 . The method of  claim 6 , wherein the distance between the first terminal and the second terminal is identified based on a communication range. 
     
     
         8 . The method of  claim 5 , wherein the negative acknowledgement for the data which is not successfully decoded is transmitted without identifying a distance between a first terminal and the second terminal in case that the negative-only acknowledgement is indicated by the SCI and the second terminal location information is not available. 
     
     
         9 . A first terminal in a wireless communication system, the first terminal comprising:
 a transceiver; and   at least one processor configured to:
 identify whether a hybrid automatic repeat request (HARQ) feedback is enabled for a groupcast, 
 identify whether a number of candidate physical sidelink feedback channel (PSFCH) resources associated with a sidelink grant is greater than or equal to a group size, in case that the HARQ feedback is enabled for the groupcast, 
 select either a positive-negative acknowledgement or a negative-only acknowledgement, in case that the number of the candidate PSFCH resources associated with the sidelink grant is greater than or equal to the group size, and 
 transmit, to a second terminal via the transceiver, sidelink control information (SCI) indicating that the HARQ feedback is enabled and a result of a selection. 
   
     
     
         10 . The first terminal of  claim 9 , wherein the at least one processor is further configured to:
 select the negative-only acknowledgement, in case that the group size is greater than the number of the candidate PSFCH resources associated with the sidelink grant, and   transmit, to the second terminal via the transceiver, the SCI indicating that the HARQ feedback is enabled and the negative-only acknowledgement.   
     
     
         11 . The first terminal of  claim 9 , wherein, in case that the negative-only acknowledgement is selected, only a HARQ negative-acknowledgment (NACK) is received from the second terminal when a data is not successfully decoded by the second terminal. 
     
     
         12 . The first terminal of  claim 9 , wherein the group size corresponded to a number of group members for the groupcast. 
     
     
         13 . A second terminal in a wireless communication system, the second terminal comprising:
 a transceiver; and   at least one processor configured to:
 receive, via the transceiver, sidelink control information (SCI) indicating that a hybrid automatic repeat request (HARQ) feedback is enabled, 
 identify whether a negative-only acknowledgement is indicated by the SCI, 
 identify whether second terminal location information is available, and 
 transmit, via the transceiver, a negative acknowledgement for a data which is not successfully decoded, in case that the negative-only acknowledgement is indicated by the SCI and the second terminal location information is not available. 
   
     
     
         14 . The second terminal of  claim 13 , wherein the at least one processor is further configured to:
 identify a distance between a first terminal and the second terminal, in case that the negative-only acknowledgement is indicated by the SCI and the second terminal location information is available,   wherein the negative acknowledgement for the data which is not successfully decoded is transmitted based on the identified distance.   
     
     
         15 . The second terminal of  claim 14 , wherein the distance between the first terminal and the second terminal is identified based on a communication range. 
     
     
         16 . The second terminal of  claim 13 , wherein the negative acknowledgement for the data which is not successfully decoded is transmitted without identifying a distance between a first terminal and the second terminal in case that the negative-only acknowledgement is indicated by the SCI and the second terminal location information is not available.