Abstract: A method for performing ciphering in a wireless communications system includes performing a first ciphering procedure for a first Non-Access Stratum message to get a second Non-Access Stratum message, generating a Radio Resource Control message, which is not ciphered, in a Radio Resource Control layer, combining the second Non-Access Stratum message with the Radio Resource Control message to form a first concatenated message, performing a second ciphering procedure for both the NAS message and the RRC message within the first concatenated message to get a second concatenated message, and transmitting the second concatenated message.

Abstract: A method for configuring signaling radio bearer in a wireless communications system includes not ciphering a non-concatenated message on a radio resource control layer or its lower layer and transmitting a concatenated message and the non-concatenated message on different signaling radio bearers, wherein a non-concatenated message consists of a Non-Access Stratum message only and a concatenated message consists of both Non-Access Stratum message and Access Stratum message.

Abstract: A method for performing integrity protection in a receiver of a wireless communications system includes receiving a concatenated message including a Non-Access Stratum message, a first message authentication code of the Non-Access Stratum message, a Radio Resource Control message and a second message authentication code of the concatenated message, performing an integrity protection procedure for the concatenated message, and discarding the concatenated message and not delivering the Non-Access Stratum message to an upper layer when the second message authentication code does not pass the integrity protection procedure.

Abstract: A method for performing security error recovery in a wireless communications system includes a Packet Data Convergence Protocol layer of the wireless communications system performing a security protection procedure for a Non-Access Stratum message, and the Packet Data Convergence Protocol layer including a protocol error detection and recovery function, for detecting a security error due to a security parameter going out of synchronization and for recovering synchronization of the security parameter.

Abstract: A method for handling protocol errors in a wireless communications system includes establishing a first signaling radio bearer and triggering an integrity protection procedure of the first signaling radio bearer, receiving a first message on the first signaling radio bearer, and neglecting the first message and initiating a synchronization procedure to synchronize a ciphering parameter when a predefined condition is met.

Abstract: A method for handling protocol errors in a receiver of a wireless communications system includes receiving a ciphered PDU, deciphering the PDU, and triggering a reset procedure when at least one field of the PDU comprises an invalid value.

Abstract: A method for setting a header of a protocol data unit in a radio link control layer of a wireless communications system, wherein a length indicator consisting of multiple bits is used to indicate an ending position of a first service data unit carried by a first PDU, includes under a predefined condition, not inserting a length indicator for a second SDU carried by a second PDU in the header of the second PDU.

Abstract: A packet transmission method for a transmitter in a wireless communications system, for enhancing transmission efficiency when sporadic data transmission is needed, is disclosed. The packet transmission method includes initiating an HARQ procedure, triggering a transmission of a packet, and sending the packet repetitively until a predefined number of ACKs corresponding to the packet are received.

Abstract: A method for setting a serving grant value in a user end of a wireless communications system includes steps of determining a maximum serving grant value when a non-serving relative grant message is received, and updating the serving grant value according to the maximum serving grant value.

Abstract: A method for setting field data of a scheduling information in a wireless communications system according to the Medium Access Control protocol specification of the 3rd Generation Partnership Project is disclosed. The scheduling information comprises at least a Highest priority Logical channel Buffer Status field, called HLBS field hereinafter, for storing an HLBS index. The method comprises setting a value of the HLBS index to be a second value when an HLBS value is greater than a first value, and storing the value of the HLBS index into the HLBS field. Figures.

Abstract: To eliminate overhead in a wireless communications system, a method of performing security sequence numbering uses a first sequence number in a first protocol entity as a parameter of a first security function, and uses the first sequence number in a second protocol entity as a parameter of a second security function. The first security function is different from the second security function.

Abstract: A method for detecting local NACK in a wireless communications system comprises an HARQ transmitter generating a local NACK signal when the HARQ transmitter gives up HARQ transmission due to expiration of a timer.

Abstract: A DTX to NACK error in a transmission in an HARQ of a mobile communications system can cause packet loss. To prevent the packet loss, when a transport block size indicator and a transmission status indicator are received, the DTX to NACK error is detected when the transport block size indicator indicates that the transmission is a retransmission and the transmission status indicator indicates that the transmission is a new transmission, and an error report with information indicating a lost transport block is sent to the HARQ transmitter.

Abstract: To conserve radio resources in a wireless communications system through sequence number reuse, a method of performing data framing uses a sequence number in a first protocol entity as a parameter of a security function, then reuses the sequence number in a second protocol entity for a predetermined function. The second protocol entity is a lower layer of the first protocol entity.

Abstract: To reduce overhead in transmission of a wireless communications system upon handover from a source base station to a target base station, a request received by a transmitter for retransmitting a packet that has been confirmed before is neglected. Requests received by a receiver from the target base station for retransmitting a packet that has been confirmed by the source base station are also neglected.

Abstract: To handle uplink data upon handover of a user equipment from a source base station to a target base station in a wireless communications system, the source base station forwards a message to the target base station. The message indicates values of missing sequence numbers and a sequence number of a last received radio link control service data unit.

Abstract: To handle downlink data upon handover of a user equipment from a source base station to a target base station in a wireless communications system, the source base station forwards a plurality of radio link control (RLC) service data units (SDUs) or RLC protocol data units (PDUs) that have not been positively acknowledged by the user equipment to the target base station. Then, the target base station sends the plurality of RLC SDUs or RLC PDUs to the user equipment.

Abstract: To reduce overhead in a radio link control (RLC) protocol data unit (PDU) header, when a plurality of package data convergence protocol (PDCP) protocol data units (PDU) are multiplexed into a radio link control (RLC) PDU, a first PDCP sequence number (SN) of a first PDCP PDU of the plurality of PDCP PDUs is used, and all PDCP SNs of the plurality of PDCP PDUs other than the first PDCP SN are removed from the RLC PDU.

Abstract: A method for enhancing data transmission efficiency in a wireless communications system includes using a first receiving window and a second receiving window in a receiver side of an entity operating in Acknowledgement Mode, wherein the first receiving window provides a function of Automatic Retransmission Request and the second receiving window is utilized for detecting missing Sequence Numbers.

Abstract: A transmitter is capable of transmitting layer 2 protocol data units (PDUs). Each PDU has an n-bit sequence number. A base sequence number BT(A) is obtained that marks a beginning sequence number of a transmitting window of the transmitter. A current sequence number VT(S) is obtained that marks a sequence number of a PDU that is next to be transmitted by the transmitter. 2n is added to a difference of the current sequence number VT(S) and the base sequence number VT(A) to yield a first value. A second value is obtained that is a modulus of the first value with 2n. A test value is then obtained that is the second value divided by a size of the transmitting window. Polling is triggered when the test value is greater than or equal to a polling value. The polling value represents a percentage of the transmitting window that has been transmitted.