Method and apparatus for data security and automatic repeat request implementation in a wireless communication system

A wireless transmit/receive unit (WTRU) comprising:

• circuitry configured to be provided a first assignment of physical resources;
• the circuitry is further configured to provide a packet data convergence protocol (PDCP) sequence number (SN) to a data block;
• the circuitry is further configured to cipher the data block using the PDCP SN and a bearer identification (ID);
• the circuitry is further configured to produce a radio link control (RLC) protocol data unit (PDU) including at least a portion of the ciphered data block;
• the circuitry is further configured to transmit the RLC PDU using the first assigned physical resources as a first long term evolution (LTE) signal;
• the circuitry is further configured to be provided a second assignment of physical resources;
• and
• the circuitry is further configured on a condition that the transmission of the RLC PDU was not successful:
• to determine whether to retransmit the RLC PDU or to segment the RLC PDU into RLC PDU segments and transmit the RLC PDU segments based on the second assignment of physical resources;
• and
• to retransmit the RLC PDU or to transmit at least one of the RLC PDU segments using the second assigned physical resources as a second LTE signal.