Method and apparatus for random access in repetition mode in wireless mobile communication system

Abstract

A method for random access is provided. Method for random access includes receiving a SIB 1, selecting a normal uplink or a supplementary uplink based on rsrp-ThresholdSSB-SUL, selecting message 3 repetition mode based on a rsrp-Threshold2 of the supplementary uplink if the supplementary uplink is selected, selecting a SSB based on a rsrp-ThresholdSSB in the fourth random access related information if message 3 repetition mode is selected, selecting a preamble group based on a preamble reception target power in a first information element of the fourth random access related information and a first offset in a second information element of the fourth random access related information, determining transmission power of a preamble based on the preamble reception target power and a prach-ConfigurationIndex in the fourth random access related information, transmitting the preamble, receiving a RAR via a specific SearchSpace and determining a number of message 3 repetition.

What is claimed is: 
     
         1 . A method performed by a wireless device, the method comprising:
 receiving system information of a cell, wherein the system information comprises a plurality of configuration parameters associated with random access, and wherein the plurality of configuration parameters associated with random access comprises:
 a first configuration parameter of uplink; 
 a second configuration parameter of the uplink; 
 a first configuration parameter of supplementary uplink, wherein the first configuration parameter of the supplementary uplink comprises a first power offset; and 
 a second configuration parameter of the supplementary uplink, wherein the second configuration parameter of the supplementary uplink comprises a second power offset; 
   selecting, based on a first reference signal received power (RSRP) threshold, a supplemental uplink (SUL) carrier for performing random access;   determining, based on a second RSRP threshold, an uplink transmission repetition for the random access;   selecting, based on an RSRP threshold of the second configuration parameter of the supplementary uplink, a synchronization signal block (SSB);   selecting, based on a preamble power parameter of the second configuration parameter of the supplementary uplink and based on the second power offset of the second configuration parameter of the supplementary uplink, a preamble group;   transmitting, based on the preamble power parameter of the second configuration parameter of the supplementary uplink, a random access preamble;   receiving, based on a search space, a random access response (RAR); and   determining, based on an uplink grant of the RAR, a number of repetitions for an uplink transmission scheduled by the uplink grant of the RAR.   
     
     
         2 . The method of  claim 1 , wherein:
 the first power offset is a first delta preamble parameter of the first configuration parameter of the supplementary uplink; and   the second power offset is a second delta preamble parameter of the second configuration parameter of the supplementary uplink.   
     
     
         3 . The method of  claim 4 , wherein the preamble power parameter of the second configuration parameter of the supplementary uplink is a preamble received target power parameter of the second configuration parameter of the supplementary uplink. 
     
     
         4 . The method of  claim 2 , further comprising:
 selecting, based on the second delta preamble parameter being configured in the second configuration parameter of the supplementary uplink, the second delta preamble parameter between the first delta preamble parameter and the second delta preamble parameter.   
     
     
         5 . The method of  claim 2 , wherein the first delta preamble parameter is a msg3-DeltaPreamble configured in a PUSCH-ConfigCommon for the supplementary uplink. 
     
     
         6 . The method of  claim 2 , wherein the first RSRP threshold is present in the first configuration parameter of the uplink, and wherein the first RSRP threshold is absent in the second configuration parameter of the uplink. 
     
     
         7 . The method of  claim 6 , wherein the first RSRP threshold is present in the first configuration parameter of the supplementary uplink, and wherein the first RSRP threshold is absent in the second configuration parameter of the supplementary uplink. 
     
     
         8 . The method of  claim 1 , wherein:
 the second configuration parameter of the uplink comprises a random access configuration for message 3 (Msg3) repetition on the uplink;   the second configuration parameter of the supplementary uplink comprises a random access configuration for Msg3 repetition on the supplementary uplink; and   the determined uplink transmission repetition for the random access comprises Msg3 repetition for the random access.   
     
     
         9 . The method of  claim 1 , wherein:
 the first configuration parameter of the uplink comprises a first RSRP threshold for SSB selection;   the second configuration parameter of the uplink comprises a second RSRP threshold for SSB selection;   the first configuration parameter of the supplementary uplink comprises a third RSRP threshold for SSB selection;   the second configuration parameter of the supplementary uplink comprises a fourth RSRP threshold for SSB selection; and   the selecting, based on the RSRP threshold of the second configuration parameter of the supplementary uplink, the SSB comprises:
 selecting, based on the fourth RSRP threshold for SSB selection, the SSB. 
   
     
     
         10 . The method of  claim 1 , wherein the first configuration parameter of the supplementary uplink comprises at least one parameter of a first RACH-ConfigCommon for the supplementary uplink, and
 wherein the second configuration parameter of the supplementary uplink comprises at least one parameter of a second RACH-ConfigCommon for the supplementary uplink.   
     
     
         11 . The method of  claim 1 , wherein the first configuration parameter of the uplink comprises at least one parameter of a RACH-ConfigCommon for the uplink and at least one parameter of a PUSCH-ConfigCommon for the uplink, and
 wherein the first configuration parameter of the supplementary uplink comprises at least one parameter of a RACH-ConfigCommon for the supplementary uplink and at least one parameter of a PUSCH-ConfigCommon for the supplementary uplink.   
     
     
         12 . The method of  claim 1 , further comprising:
 repeatedly performing, based on the number of repetitions for the uplink transmission scheduled by the uplink grant of the RAR, the uplink transmission.   
     
     
         13 . The method of  claim 1 , wherein the random access corresponds to a four-step random access procedure configured for the SUL carrier, and
 wherein the system information is system information block 1 (SIB1).   
     
     
         14 . The method of  claim 1 , wherein the second configuration parameter of the supplementary uplink further comprises a prach-ConfigurationIndex, and
 wherein the transmitting the random access preamble is further based on a power offset value associated with the prach-ConfigurationIndex of the second configuration parameter of the supplementary uplink.   
     
     
         15 . The method of  claim 14 , wherein the power offset value is a DELTA_PREAMBLE value corresponding to a preamble format of the prach-ConfigurationIndex of the second configuration parameter of the supplementary uplink. 
     
     
         16 . The method of  claim 15 , wherein the transmitting the random access preamble comprises:
 determining, based on the preamble power parameter of the second configuration parameter of the supplementary uplink and based on the DELTA_PREAMBLE value, a transmission power of the random access preamble.   
     
     
         17 . The method of  claim 1 , wherein the preamble power parameter of the second configuration parameter of the supplementary uplink comprises:
 a preambleReceivedTargetPower of the second configuration parameter of the supplementary uplink.   
     
     
         18 . The method of  claim 17 , further comprising:
 performing, based on the preambleReceivedTargetPower of the second configuration parameter of the supplementary uplink and based on the second power offset of the second configuration parameter of the supplementary uplink, the uplink transmission.   
     
     
         19 . The method of  claim 18 , wherein the performing the uplink transmission comprises:
 determining, based on the preambleReceivedTargetPower of the second configuration parameter of the supplementary uplink and based on the second power offset of the second configuration parameter of the supplementary uplink, a physical uplink shared channel (PUSCH) transmission power of the uplink transmission.   
     
     
         20 . The method of  claim 18 , wherein the performing the uplink transmission is further based on a msg3-Alpha for the supplementary uplink.