Method and apparatus for encoding and decoding high speed shared control channel

A wireless transmit/receive unit (WTRU) for decoding high speed shared control channel (HS-SCCH) part 2 data, the WTRU comprising:

• a receiver for receiving part 1 data and part 2 data with attached cyclic redundancy check (CRC) bits on an HS-SCCH, the number of CRC bits being less than a WTRU identity (ID), at least one of the part 2 data and the CRC bits being masked with a mask;
• a de-masking unit for performing de-masking with the mask on at least one of the received part 2 data and the received CRC bits;
• and
• a CRC unit for performing a CRC check with the de-masked CRC bits, the part 1 data, and the part 2 data.

A method for encoding high speed shared control channel (HS-SCCH) part 2 data, the method comprising:

• generating cyclic redundancy check (CRC) bits based on part 1 data and part 2 data, the CRC bits being attached to the part 2 data, the number of CRC bits being less than a wireless transmit/receive unit (WTRU) identity (ID);
• performing WTRU-specific masking with a mask on at least one of the part 2 data and the CRC bits;
• and
• transmitting the part 1 data and the part 2 data with the attached CRC bits after the WTRU-specific masking.

A method for decoding high speed shared control channel (HS-SCCH) part 2 data, the method comprising:

• receiving part 1 data and part 2 data with attached cyclic redundancy check (CRC) bits on an HS-SCCH, the number of CRC bits being less than a wireless transmit/receive unit (WTRU) identity (ID), at least one of the part 2 data and the CRC bits being masked with a mask;
• performing de-masking with the mask on at least one of the received part 2 data and the received CRC bits;
• and
• performing a CRC check with the de-masked CRC bits, the part 1 data, and the part 2 data.

A Node-B for encoding high speed shared control channel (HS-SCCH) part 1 data, the Node-B comprising:

• a channel encoder for performing channel coding on part 1 data;
• a rate matching unit for performing rate matching on the encoded part 1 data;
• a masking unit for generating a maximum minimum-Hamming-distance mask using a wireless transmit/receive unit (WTRU) identity (ID) and a generator matrix, and performing masking with the mask on the rate matched encoded part 1 data;
• and
• a transmitter for transmitting the masked part 1 data.

A wireless transmit/receive unit (WTRU) for decoding high speed shared control channel (HS-SCCH) part 1 data, the WTRU comprising:

• a receiver for receiving part 1 data;
• a de-masking unit for generating a maximum minimum-Hamming-distance mask using a WTRU identity (ID) and a generator matrix and performing de-masking with the mask on the received part 1 data;
• a rate de-matching unit for performing rate de-matching on the de-masked part 1 data;
• and
• a channel decoder for performing channel decoding on the rate de-matched part 1 data.

A method for encoding high speed shared control channel (HS-SCCH) part 1 data, the method comprising:

• performing channel coding on part 1 data;
• performing rate matching on the encoded part 1 data;
• generating a maximum minimum-Hamming-distance mask using a wireless transmit/receive unit (WTRU) identity (ID) and a generator matrix;
• performing masking of the rate matched encoded part 1 data with the mask;
• and
• transmitting the masked part 1 data.

A method for decoding high speed shared control channel (HS-SCCH) part 1 data, the method comprising:

• receiving part 1 data;
• generating a maximum minimum-Hamming-distance mask using a WTRU identity (ID) and a generator matrix;
• performing de-masking of the received part 1 data with the mask;
• performing rate de-matching on the de-masked part 1 data;
• and
• performing channel decoding on the rate de-matched part 1 data.