A wireless terminal for a wireless communication, the wireless terminal comprising: a memory that includes a buffer configured to store uplink data, wherein the uplink data is configured to be transmitted; and a controller configured to transmit a buffer status report, the buffer status report including an index, wherein the controller is configured to select the index from among a plurality of buffer status indices in a predetermined buffer status table by using a buffer size, the buffer size indicating a size of the uplink data stored in the buffer, wherein the predetermined buffer status table has predetermined content such that a range from a minimum value of the buffer size to a maximum value of the buffer size is divided into a plurality of subranges, the plurality of subranges being associated with a part of the plurality of buffer status indices in the predetermined buffer status table, wherein a rest of the plurality of buffer status indices in the predetermined buffer status table are associated with one or more reserved fields in the predetermined buffer status table, characterized in that to select the index comprises to select the index from among the plurality of buffer status indices other than the rest of the plurality of buffer status indices in the predetermined buffer status table, wherein the minimum value of the buffer size in the predetermined buffer status table is 0 byte, and whereby a range of the plurality of buffer status indices is 0 to 255, the rest of the plurality of buffer status indices includes at least an index having a value of 255, and the buffer status report includes the index which has a value other than 255. a memory that includes a buffer configured to store uplink data, wherein the uplink data is configured to be transmitted; and a controller configured to transmit a buffer status report, the buffer status report including an index, wherein the controller is configured to select the index from among a plurality of buffer status indices in a predetermined buffer status table by using a buffer size, the buffer size indicating a size of the uplink data stored in the buffer, wherein the predetermined buffer status table has predetermined content such that a range from a minimum value of the buffer size to a maximum value of the buffer size is divided into a plurality of subranges, the plurality of subranges being associated with a part of the plurality of buffer status indices in the predetermined buffer status table, wherein a rest of the plurality of buffer status indices in the predetermined buffer status table are associated with one or more reserved fields in the predetermined buffer status table, characterized in that to select the index comprises to select the index from among the plurality of buffer status indices other than the rest of the plurality of buffer status indices in the predetermined buffer status table, wherein the minimum value of the buffer size in the predetermined buffer status table is 0 byte, and whereby a range of the plurality of buffer status indices is 0 to 255, the rest of the plurality of buffer status indices includes at least an index having a value of 255, and the buffer status report includes the index which has a value other than 255.