Method and apparatus of transmitting control information in wireless communication systems

Abstract

The present disclosure relates to communication schemes for combining 5G communication systems with IoT technology to support higher data transmission rate as post-4G systems and systems for the same. The present disclosure may be used in intelligent services (e.g., smart home, smart building, smart city, smart car, or connected car, health-care, digital education, retail business, security and safety-related services, etc.) based on the 5G communication technology and IoT-related techniques. According to an embodiment of the present disclosure, a method for transmitting control information in a wireless communication system comprises generating a header including a plurality of MAC subheaders and a medium access control (MAC) control information including a control field indicating whether there are included information related to a power headroom for a primary cell (PCell) and information regarding secondary cells (SCells) reportable to an extended power headroom and transmitting a payload including the MAC control information and the header, wherein the control field indicating activation or deactivation of at least one of the SCells.

What is claimed is: 
     
       1. A method of a user equipment (UE) in a wireless communication system, the method comprising:
 receiving, from a base station (BS), a master information block (MIB) including information related to a number of repetition transmission of a first system information block (SIB);   receiving, from the BS, the first SIB based on the information related to the number of repetition transmission, the first SIB including scheduling information of a second SIB; and   receiving, from the BS, the second SIB based on the scheduling information.   
     
     
       2. The method of  claim 1 ,
 wherein the first SIB is repeatedly received based on the number of repetition transmission and is used for a machine type communication UE, and   wherein the scheduling information includes at least one of information on a frequency resource or information on frequency hopping used for transmission of the second SIB for the machine type communication UE.   
     
     
       3. The method of  claim 1 , further comprising:
 receiving, from the BS, information indicating system information update on a downlink control channel.   
     
     
       4. The method of  claim 1 ,
 wherein the first SIB further includes information indicating an extended system frame number (SFN) for a machine type communication UE, and   wherein the first SIB or the second SIB further includes at least one of:
 information indicating a number of repetition transmission of a preamble associated with a random access for the machine type communication UE, 
 information on a physical random access channel (PRACH) resource associated with the random access for the machine type communication UE, or 
 information on at least one threshold associated with the PRACH resource for the machine type communication UE. 
   
     
     
       5. The method of  claim 4 , further comprising:
 measuring a reference signal received power (RSRP);   determining a repetition level for the repetition transmission of the preamble based on a comparison result of the RSRP with the at least one threshold; and   transmitting, to the BS, the preamble based on the number of the repetition transmission associated with the determined repetition level.   
     
     
       6. A user equipment (UE) in a wireless communication system, the UE comprising:
 a transceiver; and   at least one processor coupled with the transceiver and configured to:
 receive, from a base station (BS), a master information block (MIB) including information related to a number of repetition transmission of a first system information block (SIB), 
 receive, from the BS, the first SIB based on the information related to the number of repetition transmission, the first SIB including scheduling information of a second SIB, and 
 receive, from the BS, the second SIB based on the scheduling information. 
   
     
     
       7. The UE of  claim 6 ,
 wherein the first SIB is repeatedly received based on the number of repetition transmission and is used for a machine type communication UE, and   wherein the scheduling information includes at least one of information on a frequency resource or information on frequency hopping used for transmission of the second SIB for the machine type communication UE.   
     
     
       8. The UE of  claim 7 , wherein the at least one processor is further configured to receive, from the BS, information indicating system information update on a downlink control channel. 
     
     
       9. The UE of  claim 7 ,
 wherein the first SIB further includes information indicating an extended system frame number (SFN) for a machine type communication UE, and   wherein the first SIB or the second SIB further includes at least one of:
 information indicating a number of repetition transmission of a preamble associated with a random access for the machine type communication UE, 
 information on a physical random access channel (PRACH) resource associated with the random access for the machine type communication UE, or 
 information on at least one threshold associated with the PRACH resource for the machine type communication UE. 
   
     
     
       10. The UE of  claim 9 , wherein the at least one processor is further configured to:
 measure a reference signal received power (RSRP),   determine a repetition level for the repetition transmission of the preamble based on a comparison result of the RSRP with the at least one threshold, and   transmit, to the BS, the preamble based on the number of the repetition transmission associated with the determined repetition level.   
     
     
       11. A method of a base station (BS) in a wireless communication system, the method comprising:
 transmitting a master information block (MIB) including information related to a number of repetition transmission of a first system information block (SIB);   transmitting the first SIB based on the information related to the number of repetition transmission, the first SIB including scheduling information of a second SIB; and   transmitting the second SIB based on the scheduling information.   
     
     
       12. The method of  claim 11 ,
 wherein the first SIB is repeatedly transmitted based on the number of repetition transmission and is used for a machine type communication UE, and   wherein the scheduling information includes at least one of information on a frequency resource or information on frequency hopping used for transmission of the second SIB for the machine type communication UE.   
     
     
       13. The method of  claim 11 , further comprising:
 transmitting information indicating system information update on a downlink control channel.   
     
     
       14. The method of  claim 11 ,
 wherein the first SIB further includes information indicating an extended system frame number (SFN) for a machine type communication UE, and   wherein the first SIB or the second SIB further includes at least one of:
 information indicating a number of repetition transmission of a preamble associated with a random access for the machine type communication UE, 
 information on a physical random access channel (PRACH) resource associated with the random access for the machine type communication UE, or 
 information on at least one threshold associated with the PRACH resource for the machine type communication UE. 
   
     
     
       15. The method of  claim 14 , further comprising:
 receiving, from the machine type communication UE, the preamble based on the number of the repetition transmission associated with a repetition level,   wherein the repetition level is determined by the machine type communication UE for the repetition transmission of the preamble based on a comparison result of the RSRP with the at least one threshold.   
     
     
       16. A base station (BS) in a wireless communication system, the BS comprising:
 a transceiver; and   at least one processor coupled with the transceiver and configured to:
 transmit a master information block (MIB) including information related to a number of repetition transmission of a first system information block (SIB), 
 transmit the first SIB based on the information related to the number of repetition transmission, the first SIB including scheduling information of a second SIB, and 
 transmit the second SIB based on the scheduling information. 
   
     
     
       17. The BS of  claim 16 ,
 wherein the first SIB is repeatedly transmitted based on the number of repetition transmission and is used for a machine type communication UE, and   wherein the scheduling information includes at least one of information on a frequency resource or information on frequency hopping used for transmission of the second SIB for the machine type communication UE.   
     
     
       18. The BS of  claim 16 , wherein the at least one processor is further configured to transmit information indicating system information update on a downlink control channel. 
     
     
       19. The BS of  claim 16 ,
 wherein the first SIB further includes information indicating an extended system frame number (SFN) for a machine type communication UE, and   wherein the first SIB or the second SIB further includes at least one of:
 information indicating a number of repetition transmission of a preamble associated with a random access for the machine type communication UE, 
 information on a physical random access channel (PRACH) resource associated with the random access for the machine type communication UE, or 
 information on at least one threshold associated with the PRACH resource for the machine type communication UE. 
   
     
     
       20. The BS of  claim 19 ,
 wherein the at least one processor is further configured to receive, from the machine type communication UE, the preamble based on the number of the repetition transmission associated with a repetition level, and   wherein the repetition level is determined by the machine type communication UE for the repetition transmission of the preamble based on a comparison result of the RSRP with the at least one threshold.   
     
     
       21. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
 receiving, from a base station, a system information block (SIB) including information about a plurality of random access preamble groups for a plurality of coverage extension (CE) levels and information about at least one threshold for the plurality of CE levels;   identifying a CE level for the UE among the plurality of CE levels based on the information about the at least one threshold for the plurality of CE levels and a measured reference signal received power (RSRP);   identifying a random access preamble included in a random access preamble group based on the identified CE level and the information about the plurality of random access preamble groups for the plurality of CE levels;   transmitting, to the base station, the random access preamble based on a number of repetitions required for preamble transmission corresponding to the identified CE level; and   receiving, from the base station. a random access response (RAR) message as a response to the transmitting the random access preamble,   wherein the information about the plurality of random access preamble groups for the plurality of CE levels includes a first value and a second value of each of the plurality of random access preamble groups for the plurality of CE levels,   the first value corresponds to a first preamble of the each of the plurality of random access preamble groups for the plurality of CE levels, and   the second value corresponds to a last preamble of the each of the plurality of random access preamble groups for the plurality of CE levels.   
     
     
       22. The method of  claim 21 , wherein the information about the plurality of random access preamble groups for the plurality of CE levels includes information related to random access preambles included in the random access preamble group. 
     
     
       23. The method of  claim 21 , further comprising:
 transmitting, to the base station, a message based on the RAR message,   wherein the RAR message includes information on a frequency for the transmitting the message.   
     
     
       24. The method of  claim 21 , wherein the receiving the RAR message as the response to the transmitting the random access preamble comprises:
 receiving, from the base station, the RAR message in a downlink frequency corresponding to the CE level based on the SIB.   
     
     
       25. The method of  claim 21 , further comprising:
 receiving, from the base station, a master information block (MIB) including configuration information for the UE,   wherein the SIB is received based on the MIB, and the SIB corresponds to system information block type2.   
     
     
       26. A method performed by a base station (BS) in a wireless communication system, the method comprising:
 transmitting. to a user equipment (UE), a system information block (SIB) including information about a plurality of random access preamble groups for a plurality of coverage extension (CE) levels and information about at least one threshold for the plurality of CE levels;   receiving, from the UE, a random access preamble based on the SIB, wherein the random access preamble is received based on a number of repetitions required for preamble transmission corresponding to a CE level; and   transmitting, to the UE, a random access response (RAR) message as a response to the receiving the random access preamble,   wherein the random access preamble included in a random access preamble group is identified based on the CE level and the information about the plurality of random access preamble groups for the plurality of CE levels,   wherein the CE level among the plurality of CE levels is identified based on the information about the at least one threshold for the plurality of CE levels and a measured reference signal received power (RSRP), and   wherein the information about the plurality of random access preamble groups for the plurality of CE levels includes a first value and a second value of each of the plurality of random access preamble groups for the plurality of CE levels,   the first value corresponds to a first preamble of the each of the plurality of random access preamble groups for the plurality of CE levels, and   the second value corresponds to a last preamble of the each of the plurality of random access preamble groups for the plurality of CE levels.   
     
     
       27. The method of  claim 26 , wherein the information about the plurality of random access preamble groups for the plurality of CE levels includes information related to random access preambles included in the random access preamble group. 
     
     
       28. The method of  claim 26 , further comprising:
 receiving, from the UE, a message based on the RAR message,   wherein the RAR message includes information on a frequency for the receiving the message.   
     
     
       29. The method of  claim 26 , wherein the transmitting, to the UE, the RAR message as the response to the receiving the random access preamble comprises:
 transmitting, to the UE, the RAR message in a downlink frequency corresponding to the CE level based on the SIB.   
     
     
       30. The method of  claim 26 , further comprising:
 transmitting, to the UE, a master information block (MIB) including configuration information for the UE,   wherein the SIB is transmitted based on the MIB, and the SIB corresponds to system information block type2.   
     
     
       31. A user equipment (UE) in a wireless communication system, the UE comprising:
 a transceiver; and   at least one processor coupled with the transceiver and configure to:
 receive, from a base station, a system information block (SIB) including information about a plurality of random access preamble groups for a plurality of coverage extension (CE) levels and information about at least one threshold for the plurality of CE levels, 
 identify a CE level for the UE among the plurality of CE levels based on the information about the at least one threshold for the plurality of CE levels and a measured reference signal received power (RSRP), 
 identify a random access preamble included in a random access preamble group based on the identified CE level and the information about the plurality of random access preamble groups for the plurality of CE levels, 
 transmit, to the base station, the random access preamble based on a number of repetitions required for preamble transmission corresponding to the identified CE level, and 
 receive, from the base station, a random access response (RAR) message as a response to the transmitting the random access preamble, 
   wherein the information about the plurality of random access preamble groups for the plurality of CE levels includes a first value and a second value of each of the plurality of random access preamble groups for the plurality of CE levels,   the first value corresponds to a first preamble of the each of the plurality of random access preamble groups for the plurality of CE levels, and   the second value corresponds to a last preamble of the each of the plurality of random access preamble groups for the plurality of CE levels.   
     
     
       32. The UE of  claim 31 , wherein the information about the plurality of random access preamble groups for the plurality of CE levels includes information related to random access preambles included in the random access preamble group. 
     
     
       33. The UE of  claim 31 , wherein the at least one processor is further configured to:
 transmit, to the base station, a message based on the RAR message,   wherein the RAR message includes information on a frequency for the transmitting the message.   
     
     
       34. The UE of  claim 31 , wherein the at least one processor is configured to:
 receive, from the base station, the RAR message in a downlink frequency corresponding to the CE level based on the SIB.