Abstract: A method of handling packet data in a wireless communications system includes activating a hybrid automatic repeat request process, determining whether each of a plurality of packets to be transmitted is a signaling message or a control message, and setting maximum number of transmissions for a first packet of the plurality of packets to be 1 when the first packet is determined to be a signaling message or a control message.

Abstract: A method of resetting radio link control entity in a receiver of a wireless communications system includes receiving a reset protocol data unit (RESET PDU), and not resetting a radio link control (RLC) entity if a reset sequence number (RSN) value in the RESET PDU is the same as an RSN value in a last received RESET PDU and if the RESET PDU is not the first RESET PDU received since the RLC entity was established or re-established.

Abstract: A method of starting Integrity Protection in a receiving end of a radio communications system starts with receiving a first Radio Resource Control (RRC) message for starting Integrity Protection. Then, a first Signaling Radio Bearer (SRB) is used to output a second RRC message to a network end of the radio communications system for indicating completion of starting Integrity Protection. Finally, a second SRB is prohibited from transmitting a third RRC message before receiving a confirmation message from the network end acknowledging successful receipt of the second RRC message.

Abstract: A method of modifying Integrity Protection Configuration in a user end of a communications system starts with receiving a first Radio Resource Control (RRC) message through a first Signaling Radio Bearer (SRB) on downlink for modifying the Integrity Protection Configuration. Activation Time of a second SRB on uplink is set to at least VR(RRC SN)+2. The Activation Time of the second SRB on uplink is attached to a second RRC message utilized for indicating completion of modifying the Integrity Protection Configuration. The second RRC message is outputted to a network end of the communications system through the first SRB on uplink. Finally, a third RRC message having a sequence number equal to the Activation Time is outputted through the second SRB on uplink after receiving an acknowledgement message indicating that the network end successfully received the second RRC message.

Abstract: A method for initiating a storage window of a receiving end in a wireless communications system, which periodically retransmits previously transmitted data packets in an unacknowledged mode, includes receiving a first PDU after a receiving entity of the receiving end is established, re-established, or after a timer expires, and initiating a state variable, which is defined to be a sequence number of the highest numbered packet that has been received, according to a sequence number of the first received packet. An example of the wireless communications system is the Universal Mobile Telecommunications System (UMTS) with a multimedia broadcast/multicast service (MBMS) application.

Abstract: A wireless communications system operates in Acknowledged Mode. The wireless communications system has a control circuit, a central processing unit, and a memory storing a program code. When transmitting signaling messages, the wireless communications system transmits a data packet a predetermined number of times greater than 1 to ensure that the data packet is received successfully.

Abstract: A wireless communications system has a communications device, which has an RLC entity having a transmitting side and a receiving side. When re-establishing the receiving side, to handle control PDUs, only the receiving side in the RLC entity of the communications device is re-established, a first control PDU corresponding to the receiving side is discarded, and a second control PDU corresponding to the transmitting side is retained and not discarded.

Abstract: A method for improving transmission delay of a status report in a wireless communications system operating in an Acknowledged Mode includes triggering a status report transfer procedure and transmitting a status report packet a predetermined number of times that is more than one. A related wireless communications apparatus has a control circuit, a central processing unit, a memory, and program code for triggering a status report transfer procedure and transmitting a status report packet a predetermined number of times that is more than one.

Abstract: A communications device utilized in a wireless communications system has an RLC entity with a transmitting side and a receiving side. Handling timers during reestablishment of the transmitting side includes only reestablishing the transmitting side in the RLC entity of the communications device, stopping a first timer corresponding to the transmitting side, and prolonging and not stopping a second timer corresponding to the transmitting side. The second timer is not a periodic timer.

Abstract: A communications device utilized in a wireless communications system has an RLC entity with a transmitting side and a receiving side. Handling timers during re-establishment of the receiving side includes only re-establishing the receiving side in the RLC entity of the communications device, stopping a first timer corresponding to the receiving side, and prolonging and not stopping a second timer corresponding to the transmitting side.

Abstract: A wireless communications system has a communications device, which has an RLC entity having a transmitting side and a receiving side. When re-establishing the transmitting side, to handle control PDUs, only the transmitting side in the RLC entity of the communications device is re-established, a first control PDU corresponding to the transmitting side is discarded, and a second control PDU corresponding to the receiving side is retained and not discarded.

Abstract: A method of data segmentation in a transmitter of a mobile communications system includes initiating alternate extension bit interpretation, a last data segment of a Service Data Unit exactly ending at an end of a Protocol Data Unit, no Length Indicator in the Protocol Data Unit indicating the end of the Service Data Unit, a length of a next Service Data Unit following the Service Data Unit exactly equaling to a length of a data field of a next Protocol Data Unit following the Protocol Data Unit, and setting a first extension bit of the next Protocol Data Unit to be a specified value for indicating that the next Protocol Data Unit comprises a complete Service Data Unit, which is not segmented, concatenated or padded, and indicating that a Service Data Unit exactly ended in the Protocol Data Unit.

Abstract: Several methods to avoid potential deadlocks in a SDU discard function are disclosed. First, the decision rule of deciding discarded SDUs in a SDU discard function is modified. Consideration of the Length Indicator is added to the decision of discarded SDUs in a SDU discard function to completely cover the SDU set that should be discarded. Secondly, the status-formatted padding PDU is chosen when padding PDUs is needed. Finally, modified explicit SDU discarding SUFI to cover scenarios that cannot be handled by the conventional MRW SUFI is utilized.