Apparatus and method for communicating MAC layer data in broadband wireless communication system

A receiving apparatus in a wireless communication system, comprising:

• a radio-frequency (RF) receiver for converting a received RF signal into a baseband signal;
• a decoder for decoding according to requirements of a physical layer, the baseband signal from the RF receiver to generate protocol data unit (PDU);
• a header analyzer for detecting and analyzing a header of the PDU;
• and
• an error checker for selecting a length of an error check code using PDU length data written in the header, and performing an error check on the PDU according to the selected length,
• wherein the error checker includes a lookup table for storing a mapping relationship between PDU length and error check code length, and
• wherein, in the lookup table, an error check code length corresponding a PDU length N is greater than or equal to an error check code length corresponding a PDU length M, where N is greater than M.

A transmitting method in a communication system, comprising:

• generating a protocol data unit (PDU) payload;
• selecting a length of an error check code according to a length of the generated payload;
• generating an error check code according to the selected length and suffixing the error check code to the PDU payload;
• generating a header for the generated payload and prefixing the header to the PDU payload;
• encoding, according to physical layer requirements, the PDU including the PDU payload, the header prefixed to the PDU payload, and the error check code suffixed to the PDU payload;
• converting the physical layer encoded data into a radio-frequency (RF) signal;
• and
• transmitting the RF signal,
• wherein the length of the error check code is selected using a lookup table storing a mapping relationship between payload length and error check code length, and
• wherein, in the lookup table, an error check code length corresponding a payload length N is greater than or equal to an error check code length corresponding a payload length M, where N is greater than M.

A receiving method in a wireless communication system, comprising:

• converting a received radio-frequency (RF) signal into a baseband signal;
• decoding, according to physical layer requirements, the baseband signal to generate a protocol data unit (PDU);
• detecting and analyzing a header of the PDU;
• selecting a length of an error check code using PDU length data written in the header;
• and
• performing an error check on the PDU according to the selected length,
• wherein the length of the error check code is selected using a lookup table storing a mapping relationship between PDU length and error check code length, and
• wherein, in the lookup table, an error check code length corresponding a PDU length N is greater than or equal to an error check code length corresponding a PDU length M, where N is greater than M.

A transmitting apparatus in a wireless communication system, comprising:

• a first generator for generating a payload of a Media Access Control (MAC) layer packet;
• and
• a second generator for selecting a length of a cyclic redundancy check (CRC) code according to a length of the generated payload, and generating the CRC code according to the length of the CRC code,
• wherein the second generator comprises a memory table for storing a mapping relationship between payload length and cyclic redundancy code length, and
• wherein, in the memory table, a cyclic redundancy code length corresponding a payload length N is greater than or equal to a cyclic redundancy code length corresponding a payload length M, where N is greater than M.

A receiving apparatus in a wireless communication system, comprising:

• a detector for detecting a length of a received Media Access Control (MAC) layer packet;
• and
• an error checker for selecting a cyclic redundancy check (CRC) code according to the detected length, and performing an error check on the packet using the selected CRC code,
• wherein the error checker comprises a memory table for storing a mapping relationship between packet length and cyclic redundancy code length, and wherein, in the memory table, a cyclic redundancy code length corresponding a payload length N is greater than or equal to a cyclic redundancy code length corresponding a payload length M, where N is greater than M.