Method for determining validity of system information block and apparatus supporting same

Abstract

A method for determining the validity of a system information block (SIB) by a terminal in a wireless communication system, and an apparatus supporting the same. The method includes: receiving, from a serving cell, a first version index indicating a version of a first system information block; determining a valid sub index to be mapped to a terminal capability of the terminal, among a plurality of sub-indices configuring the first version index; and comparing a valid sub index of a second version index indicating a version of a second system information block stored in the terminal with a valid sub index of the first version index, so as to determine whether the version of the first system information block is identical to the version of the second system information block.

What is claimed is: 
     
         1 . A method for determining the validity of a system information block (SIB) by a terminal in a wireless communication system, the method comprises the steps of:
 receiving, from a serving cell, first information related to a version of a first system information block, wherein a second system information block is stored in the terminal, and second information is related to a version of the second system information;   determining a first value of the first information and a second value of the second information, wherein the first information is received with the first system information block, and the second information is stored in the terminal with the second system information block; and   comparing the second value of the second information with the first value of the first information, so as to determine whether the second system information block stored in the terminal is valid.   
     
     
         2 . The method of  claim 1 , further comprising determining that the second system information block is valid in the serving cell and applying the second system information block to the serving cell, when it is determined that the version of the first system information block is identical to the version of the second system information block. 
     
     
         3 . The method of  claim 2 , the version of the first system information block is identical to the version of the second system information block, when it is determined that the first value of the first information is identical to the second value of the second information. 
     
     
         4 . The method of  claim 1 , further comprising requesting transmission of the first system information block to the serving cell, when it is determined that the version of the first system information block is different from the version of the second system information block. 
     
     
         5 . The method of  claim 1 , the first value of the first information is composed of a plurality of bits among bits of the first information, and the second value of the second information is composed of a plurality of bits among bits of the second information. 
     
     
         6 . The method of  claim 1 , wherein the first value and the second value are each mapped to a terminal capability of the terminal, and the terminal capability is determined by at least one of a service supported by the terminal, a version of the terminal, and a category of the terminal. 
     
     
         7 . The method of  claim 1 , wherein the first information and the second information are each configured for a plurality of bits, and
 the first value and the second value are each configured to indicate one or more numbers listed at a specific position in the plurality of bits according to the terminal capability.   
     
     
         8 . The method of  claim 6 , further comprising receiving configuration information regarding a position in the column of the first value and the second value corresponding to the terminal capability from the serving cell, before performing the step of determining the first value and the second value. 
     
     
         9 . The method of  claim 8 , wherein the configuration information is periodically received from the serving cell. 
     
     
         10 . The method of  claim 8 , wherein the configuration information is provided for each system information block. 
     
     
         11 . The method of  claim 1 , wherein the first system information block indicates a current version of the system information block that is valid in the changed serving cell, after a cell reselection procedure of the terminal is performed. 
     
     
         12 . The method of  claim 1 , wherein the first system information block indicates a changed system information block, when the terminal receives a system information change notification from the serving cell. 
     
     
         13 . A terminal for determining the validity of a system information block (SIB) in a wireless communication system, comprising:
 a memory;   a transceiver; and   a processor coupled to the memory and the transceiver, and   wherein the processor configured to:   receive, from a serving cell, first information related to a version of a first system information block, wherein a second system information block is stored in the terminal, and second information is related to a version of the second system information;   determine a first value of the first information and a second value of the second information, wherein the first information is received with the first system information block, and the second information is stored in the terminal with the second system information block; and   compare the second value of the second information with the first value of the first information, so as to determine whether the second system information block stored in the terminal is valid.   
     
     
         14 . The terminal of  claim 13 , wherein the processor further configured to determine that the second system information block is valid in the serving cell and apply the second system information block to the serving cell, when it is determined that the version of the first system information block is identical to the version of the second system information block. 
     
     
         15 . The terminal of  claim 14 , wherein the processor further configured to determine that the version of the first system information block is identical to the version of the second system information block, when it is determined that the first value of the first information is identical to the second value of the second information. 
     
     
         16 . The terminal of  claim 13 , wherein the processor further configured to request transmission of the first system information block to the serving cell, when it is determined that the version of the first system information block is different from the version of the second system information block. 
     
     
         17 . The terminal of  claim 13 , the first value of the first information is composed of a plurality of bits among bits of the first information, and the second value of the second information is composed of a plurality of bits among bits of the second information.