Abstract: A method for handling packet discard in a transmitter of a wireless communications system includes activating a “use of a special value of a header extension field” mode, discarding a plurality of service data units, wherein the last service data unit of the plurality of service data units ends at an end of a first protocol data unit using the special value in a header extension field, and setting a value of a field to be a sequence number of a second protocol data unit, wherein the field is utilized for indicating a receiver to discard all not yet successfully received service data units that have segments with sequence number being less than the value of the field, and the second protocol data unit is next to the first protocol data unit.

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 of polling in a wireless communications system includes prohibiting polling within a predetermined period and triggering a poll function while polling is prohibited. After the predetermined period has expired the method determines that there are no protocol data units (PDUs) scheduled for transmission or re-transmission and that the poll function was triggered by a “Every Poll_SDU SDU” trigger, and selects a PDU to schedule for re-transmission to fulfill the poll function.

Abstract: Whenever the Receiver of this invention receives an AMD PDU or a UMD PDU with its “Length Indicator” having an invalid or a reserved value, the Receiver discards such a PDU and treats it as never received. The Receiver may report its receiving status accordingly if a report is required. This invention avoids invoking unnecessary RLC reset procedures and reduces the chance of losing HFN synchronization during AM or UM data transmissions.

Abstract: A method for optimizing a radio resource control procedure in a wireless communication system is disclosed. The wireless communication system supports Coordinated multi-point (CoMP) transmission/reception, which enables a plurality of cells cooperating and providing services for a user equipment (UE). The method includes defining cells directly or indirectly participating in transmission to the UE within the plurality of cells as members of a CoMP cooperating set, and setting the cells of the CoMP cooperating set to use a same system frame number.

Abstract: A method for reconfiguring size of a receiving window in a communications system avoiding duplicate packet delivery to an upper layer to keep ciphering parameters in synchronization when the communications system reconfigures a receiving window of a receiver includes receiving a command for reconfiguring a size of the receiving window, reconfiguring the size of the receiving window according to the command, removing packets with sequence numbers outside the receiving window from buffers of the receiver and delivering the packets to the upper layer, determining whether a sequence number of a next expected packet is below the receiving window, and keeping the sequence number of the next expected packet and the packets in a reordering buffer of the receiver unchanged when the sequence number of the next expected packet is not below the receiving window.

Abstract: A method of polling in a wireless communications system includes prohibiting polling within a predetermined period and triggering a poll function while polling is prohibited. After the predetermined period has expired the method determines that there are no protocol data units (PDUs) scheduled for transmission or re-transmission and that the poll function was triggered by a “Last PDU in Retransmission buffer” trigger, and selects a PDU to schedule for re-transmission to fulfill the poll function.

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.

Abstract: A method for setting default values of timers in a wireless communications system includes setting default values of timers Timer_RST and Timer_Poll to be a first value. The timers Timer_RST and Timer_Poll are used to respectively hold retransmission of a reset signaling packet and a polling until an expected response is received.

Abstract: A method for detecting an erroneous sequence number in a status report in a wireless communications system includes receiving a status report sent from a receiver of the wireless communications system, detecting whether a negatively acknowledged sequence number is within a range that is larger than or equal to the sequence number following the sequence number of the last in-sequence acknowledged packet and smaller than the sequence number of the next packet to be transmitted for the first time, and detecting that the status report includes an erroneous sequence number when a negatively acknowledged sequence number is not within the abovementioned range.

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: A method for handling uplink transmission start used in a mobile of a wireless communications system includes when an uplink transmission is started, if a predefined information element (IE) is not received, setting a primary state variable to “none” to indicate that a Serving Grant (SG) value can be affected by a Secondary Absolute Grant message.

Abstract: A method for triggering status report in a receiver of a wireless communications system includes sending a first status report indicating a negative acknowledgment of a packet to a transmitter and starting a status prohibit timer for prohibit sending another status report, and triggering a second status report when the packet is not completely received after the status prohibit timer expires.

Abstract: A method of polling in a wireless communications system includes prohibiting polling within a predetermined period and triggering a poll function while polling is prohibited. After the predetermined period has expired the method determines that there are no protocol data units (PDUs) scheduled for transmission or re-transmission and that there is at least a transmitted PDU that the poll function was triggered by a “Last PDU in buffer for first-time transmission” trigger, and selects a PDU to schedule for re-transmission to fulfill the poll function.

Abstract: The invention provides a data discard signalling procedure in a wireless communication system. If data is discarded by the transmitter, the transmitter needs to notify the receiver of the discard. A shortened move receiving window super-field is used to request the receiver to move its reception window and optionally to indicate the set of discarded RLC SDUs, as a result of an RLC SDU discard in the sender. A move receiving window acknowledgement super-field acknowledges the reception of a MRW SUFI. If various criteria are met, the SDU discard with explicit signalling procedure can be efficiently terminated resulting in increased transmission throughput. Utilizing the data discard signalling procedure of the present invention, transmission throughput is increased and the transmission performance is improved.

Abstract: A method of controlling a reset procedure sets a proper clocked period to the timer Timer_Status_Prohibit for blocking the timer Timer_Status_Period from interfering with the counting of the state variable VT(RST). In addition, the method of controlling a reset procedure makes use of an amended triggering condition. Therefore, the sender ignores the STATUS PDUs when the reset procedure is ongoing. To sum up, the state variable VT(RST) is not incremented abnormally, and the reset procedure behaves correctly according to the configured protocol parameter MaxRST.

Abstract: A method for triggering a poll function in a transmitter of a wireless communications system includes triggering the poll function for polling status of a receiver, and a radio link control entity of the transmitter supporting a “Last PDU” trigger and a “Poll retransmission timer” trigger, and not supporting a “Periodic Timer” trigger.

Abstract: A method for setting headers in a transmitter of a wireless communications system includes dividing a Radio Link Control Protocol Data Unit into a plurality of segments each including a header, and setting the header to include a field indicating a sequence number of the Radio Link Control Protocol Data Unit.

Abstract: This invention employs a quicker reordering buffer gap removing and buffered data block delivery method. The invention uses several parameters to support its operation. One of the pertinent parameters is a New Data Indicator, another is an array variable, TTI-States, to track at least n consecutive data block receiving statues of TTIs of the n active HARQ processes of the HARQ entity at the receiver side.

Abstract: A method for polling transmission status in a transmitter of a wireless communications system includes forming a status protocol data unit including a poll sequence number field indicating a sequence number of a protocol data unit to be polled when a polling procedure is triggered to poll a receiver, setting a value of the poll sequence number field to be a sequence number of a next protocol data unit to be transmitted for the first time minus 1, and transmitting the status protocol data unit to the receiver.