Abstract:
A method and apparatus for handling interactions between measurement gap, automated repeat request, discontinuous reception and discontinuous transmission in wireless communications are disclosed. The method and apparatus are for real-time data and non-real time data in both an uplink and a downlink.
Abstract:
A method and apparatus for supporting uplink Transmission Time Interval (TTI) bundling in Long Term Evolution (LTE) is provided. Described are related method and apparatus for signaling, activation/deactivation and wireless transmit/receive unit (WTRU) behavior.
Abstract:
Several medium access control methods are disclosed. One such method is a method for requesting an uplink resource allocation. In this method, a wireless transmit/receive unit (WTRU) receives a trigger and sends an uplink resource request to a Node B based on the trigger. The WTRU receives an uplink resource assignment and prepares for an uplink transmission using the resource assignment. The WTRU then sends an acknowledgement that the uplink resource allocation was received. A wireless transmit/receive unit according to one embodiment includes a trigger device and a processor. The trigger device is configured to receive a trigger. The processor is in communication with the trigger device, and is configured to send an uplink resource request upon receipt of the trigger, receive an uplink resource assignment, and send an acknowledgement upon receipt of the uplink resource assignment.
Abstract:
A method and apparatus for supporting uplink Transmission Time Interval (TTI) bundling in Long Term Evolution (LTE) is provided. Described are related method and apparatus for signaling, activation/deactivation and wireless transmit/receive unit (WTRU) behavior.
Abstract:
A method and apparatus are disclosed for prioritizing logical channels when a new transmission is performed. Logical channel resources are allocated for available data to a plurality of logical channels. A maximum bit rate (MBR) credit (i.e., token) is decremented in a buffer (i.e., bucket) associated with a particular one of the logical channels by the size of a medium access control (MAC) service data unit (SDU). The MBR credit may have a negative value. If any of the allocated channel resources remain, the logical channels are served n a decreasing priority order until the data is exhausted. A radio link control (RLC) SDU is not segmented if the whole RLC SDU fits into the remaining resources. The MAC SDU excludes a MAC PDU header and MAC padding.
Abstract:
A method and apparatus for segmenting medium access control (MAC) service data units (SDUs) creates enhanced MAC-es PDUs in the enhanced MAC-e/es sub-layer by concatenating MAC SDUs received from the logical channels. An enhanced transport format combination (E-TFC) selection entity controls the concatenation of MAC SDUs into enhanced MAC-es PDUs. When a MAC SDU is received that is too large to fit into a selected enhanced MAC-es PDU payload, a segmentation entity segments the MAC SDU such that the MAC SDU segment fills the remaining payload available in the selected enhanced MAC-es PDU. The enhanced MAC-es PDU is then assigned a transmission sequence number (TSN) and multiplexed with other enhanced MAC-es PDUs to create a single enhanced MAC-e PDU that is transmitted on the E-DCH in the next transmission time interval (TTI). A HARQ entity stores and, if necessary retransmits the enhanced MAC-e PDU when a transmission error occurs.
Abstract:
A method and apparatus for supporting home Node B (HNB) services are disclosed. A wireless transmit/receive unit (WTRU) receives HNB access restriction information from an HNB and accesses the HNB if an access to the HNB is allowed based on the HNB access restriction information. The HNB access restriction information may be a closed subscriber group identity (CSG ID), a status bit indicating whether an HNB cell is available or not, an identity of WTRUs that are allowed to access the HNB, information indicating whether an access to a cell is barred or not. The WTRU may trigger measurements for cell reselection even though signal strength on a currently connected cell is above a threshold. The measurement may be triggered manually, periodically, under the instruction from the network, or based on a neighbor cell list including information about HNB cells located nearby.
Abstract:
A method and apparatus for random access channel (RACH) channel selection in a long term evolution (LTE) network includes determining a distance from a wireless transmit/receive unit (WTRU) to an evolved Node-B (eNB) in a cell of the LTE network. A RACH channel is then selected based upon the distance determination.
Abstract:
A method implemented in a wireless communication system including a wireless transmit/receive unit (WTRU), a Node-B and a radio network controller (RNC) for quantizing multiplexed data allowed by grants to closely match a selected enhanced uplink transport format combination (E-TFC) transport block size is disclosed. The amount of scheduled and non-scheduled data allowed to be transmitted is quantized so that the amount of data multiplexed into an enhanced uplink (EU) medium access control (MAC-e) protocol data unit (PDU) more closely matches the selected E-TFC transport block size. In an embodiment, the amount of buffered data allowed to be multiplexed by at least one grant, (a serving grant and/or a non-serving grant), is quantized so that the sum of scheduled and non-scheduled data including MAC header and control information multiplexed into a MAC-e PDU more closely matches the selected E-TFC transport block size.
Abstract:
A method and apparatus for triggering radio link control (RLC) re-establishment and/or protocol data unit (PDU) discard are disclosed. An RLC entity maintains a state variable for counting a total number of transmissions and/or retransmissions of an RLC PDU and its PDU segments. If the state variable reaches a threshold, the RLC entity initiates RLC re-establishment and/or discards the RLC PDU and PDU segments. The state variable may be incremented each time a negative acknowledgement is received for at least a portion of the RLC PDU or when a retransmission is considered for the RLC PDU or a portion of the RLC PDU. The RLC entity may increase a state variable proportionate to a retransmitted data size. The RLC entity may maintain separate state variables for the RLC PDU and PDU segments and counts the number of transmissions and/or retransmissions for the RLC PDU and the PDU segments.