NR Broadcast Channel Transmission

Abstract

The disclosure relates to a method performed by a wireless device, for receiving system information from a network node of a wireless communication system. The system information is received in a synchronization signal (SS) block of an SS burst set comprising at least one SS block. The system information is multiplexed with information providing a time index indicating which SS block of the SS burst set that is being received. The method comprises receiving the information providing the time index, and receiving the system information, which comprises descrambling the system information using a scrambling sequence generated based on the information providing the time index. The method also comprises determining an accuracy of the information providing the time index, based on an error-detection code related to the received system information. The disclosure also relates to corresponding network node method and apparatus.

What is claimed is: 
     
         1 . A method for transmitting system information from a network node to a wireless device of a wireless communication system, the system information being transmitted in a synchronization signal (SS) block of an SS burst set comprising at least one SS block, the method comprising:
 the network node transmitting to the wireless device the system information multiplexed with information providing a time index and an error detection code related to the system information, the time index indicating which SS block of the SS burst set is being transmitted, and the system information being scrambled using a scrambling sequence generated based on the time index;   the wireless device descrambling the system information using the scrambling sequence generated based on the time index and   the wireless device determining whether the information providing the time index is accurate, based on the error-detection code.   
     
     
         2 . The method of  claim 1 , wherein the error detection code is a Cyclic Redundancy Check (CRC) attachment to information bits corresponding to the system information, and wherein the wireless device determines whether the information providing the time index is accurate by:
 performing a CRC of the system information based on the CRC attachment,   determining that the information providing the time index is inaccurate when the performed CRC indicates erroneously received system information, and   determining that the information providing the time index is accurate when the performed CRC indicates correctly received system information.   
     
     
         3 . The method of  claim 1 , further comprising:
 the wireless device determining how to perform an initial access procedure based on determining whether the information providing the time index is accurate, wherein said determining how to perform the initial access procedure comprises, when the information providing the time index is determined to be accurate, completing the initial access procedure based on the received system information, and when the information providing the time index is determined to be inaccurate, detecting another SS block for reception of system information and time index before completing the initial access procedure.   
     
     
         4 . The method of  claim 1 , wherein the information providing the time index is transmitted without any related error-detection code. 
     
     
         5 . The method of  claim 1 , wherein generating the scrambling sequence comprises initializing the scrambling sequence at the start of the SS block. 
     
     
         6 . The method of  claim 1 , further comprising:
 the wireless device determining where the boundary of the SS burst set is or where the SS burst set starts, using the information providing the time index.   
     
     
         7 . The method of  claim 1 , wherein the network node scrambles the system information by scrambling coded bits of the system information. 
     
     
         8 . A wireless communication system configured for transmission of system information in a synchronization signal (SS) block of an SS burst set comprising at least one SS block, the wireless configuration system comprising:
 a network node configured to transmit, to a wireless device, the system information multiplexed with information providing a time index and an error detection code related to the system information, the time index indicating which SS block of the SS burst set is being transmitted, the system information being scrambled using a scrambling sequence generated based on the time index; and   the wireless device, the wireless device being configured to descramble the system information using the scrambling sequence generated based on the time index and to determine whether the information providing the time index is accurate, based on the error-detection code.   
     
     
         9 . The wireless communication system of  claim 8 , wherein the error detection code is a Cyclic Redundancy Check (CRC) attachment to information bits corresponding to the system information, and wherein the wireless device determines whether the information providing the time index is accurate by:
 performing a CRC of the system information based on the CRC attachment,   determining that the information providing the time index is inaccurate when the performed CRC indicates erroneously received system information, and   determining that the information providing the time index is accurate when the performed CRC indicates correctly received system information.   
     
     
         10 . The wireless communication system of  claim 8 , wherein the wireless device is further configured to determine how to perform an initial access procedure based on determining whether the information providing the time index is accurate, wherein said determining how to perform the initial access procedure comprises, when the information providing the time index is determined to be accurate, completing the initial access procedure based on the received system information, and when the information providing the time index is determined to be inaccurate, detecting another SS block for reception of system information and time index before completing the initial access procedure. 
     
     
         11 . The wireless communication system of  claim 8 , wherein the network node is configured to transmit the information providing the time index without any related error-detection code. 
     
     
         12 . The wireless communication system of  claim 8 , wherein the network node is configured to initialize the scrambling sequence at the start of the SS block, as part of generating the scrambling sequence. 
     
     
         13 . The wireless communication system of  claim 8 , wherein the wireless device is further configured to determine where the boundary of the SS burst set is or where the SS burst set starts, using the information providing the time index. 
     
     
         14 . The wireless communication system of  claim 8 , wherein the network node is configured to scramble the system information by scrambling coded bits of the system information.