Wireless terminal, wireless base station, and transmission method of buffer status report

A wireless base station for a wireless communication, the wireless base station comprising:

• a memory;
• and
• a controller coupled to the memory, the controller configured to receive a buffer status report for a notification of a buffer size indicating a size of uplink data stored in a buffer,
• wherein the controller is configured to estimate the size of the uplink data based on an index which is selected from among a plurality of buffer status indices in a predetermined buffer status table by using a buffer size indicating a size of the uplink data stored in the buffer,
• wherein the predetermined buffer status table has a 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,
• wherein the minimum value of the buffer size in the predetermined buffer status table is 0 byte, and
• wherein the selecting of the index is configured 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.

A transmission method of a buffer status report, the method comprising:

• acquiring an index which is selected from among a plurality of buffer status indices in a predetermined buffer status table by using a buffer size being a size of uplink data stored in a buffer, a part of the plurality of buffer status indices in the predetermined buffer status table being associated with a plurality of subranges divided from a range from a minimum value of the buffer size to a maximum value of the buffer size, and a rest of the plurality of buffer status indices in the predetermined buffer status table associated with one or more reserved fields in the predetermined buffer status table;
• transmitting a buffer status report that includes the index stored in a first field,
• wherein the minimum value of the buffer size in the predetermined buffer status table is 0 byte, and
• wherein the selecting of the index is configured 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.