Abstract:
PROBLEM TO BE SOLVED: To provide a method for performing cell update and reselection while in a Cell_FACH state.SOLUTION: A WTRU in a Cell_FACH state selects a target cell (202), and reads system information from the target cell including high speed downlink shared channel (HS-DSCH) common system information (206). The WTRU configures an HS-DSCH medium access control (MAC-hs) entity on the basis of the HS-DSCH common system information, and sends a CELL UPDATE message to notify of a cell change (210). The WTRU receives an HSDPA using a common H-RNTI broadcast in the system information, a reserved H-RNTI as requested in the CELL UPDATE message, or temporary identity information which is a subset of a U-RNTI (216). The MAC-hs entity may be reset after the cell reselection.
Abstract:
PROBLEM TO BE SOLVED: To allow an AP to initiate the re-association of a WTRU without loss of performance.SOLUTION: A transceiver of an access point (AP) according to the invention is configured to send a request message to a wireless transmit/receive unit (WTRU) using a first set of communication parameters and configured to receive a response message from the WTRU using the first set of communication parameters. The request message includes an identifier of a second AP, a second set of communication parameters, and a field that indicates whether disassociation of the WTRU from the AP is immediate. The response message indicates whether the WTRU accepts or rejects connection with the second AP.
Abstract:
A method and an apparatus are provided for efficient transmission of low-data-rate packet services in a multiple-input multiple-output (MIMO) mode of operations in the presence of high-data-rate packet services. Precoding weight information (PWI) is signaled implicitly to a wireless transmit receive unit (WTRU). A precoding weight vector is signaled in a high speed shared control channel less (HS-SCCH-less) transmission using a new HS-SCCH type P. This explicit PWI signaling approach transmits the PWI with minimum power overhead. The data carried in the HS-SCCH type P is encoded to minimize the required transmitted power. A channel type HS-SCCH type 2M is also described.
Abstract:
A wireless transmit receive unit (WTRU) is configured to operate in an high speed data packet access (HSDPA) mode in a cell and/or state and to clear HSDPA resources when moving out of the cell and/or state. The WTRU is configured to clear HSDPA resources when conditions to perform high speed downlink shared channel reception are not met. When in cell transition or state transition, the WTRU checks whether there is an ongoing a high speed downlink scheduling channel (HS-DSCH) reception, and if the new cell or state cannot support HS-DSCH, then the HSDPA resources being used for the ongoing HS-DSCH reception are released. The WTRU uses radio resource control (RRC) processing, and monitors various events and conditions such as an RRC variable HS_DSCH_RECEPTION_GENERAL, which tracks HS-DSCH reception for all states in order to make the determination whether to release HSDPA resources.
Abstract:
A variety of wireless communication methods and apparatus for supporting reconfiguration of radio link control (RLC) parameters are disclosed. A radio resource control (RRC) reconfiguration message is generated that indicates that an RLC unit in a wireless transmit/receive unit (WTRU) or a universal terrestrial radio access network (UTRAN) should be reconfigured from supporting flexible size RLC protocol data units (PDUs) to supporting fixed size RLC PDUs. If an information element (IE) "one sided RLC re-establishment" is present in the RRC reconfiguration message, only a receiving side subassembly in the RLC unit is re-established. Otherwise, both the receiving side subassembly and a transmitting side subassembly in the RLC unit are re-established. Flexible size RLC PDUs may be discarded and a message indicating the discarded flexible size RLC PDUs may be transmitted. The flexible size RLC PDUs may be modified such that they correspond to a set of pre-defined sizes.
Abstract:
A method and apparatus for cell update while in a Cell_FACH state are disclosed. After selecting a target cell, system information is read from the target cell including high speed downlink shared channel (HS-DSCH) common system information. A radio network temporary identity (RNTI) received in a source cell is cleared and a variable HS_DSCH_RECEPTION is set to TRUE. An HS-DSCH medium access control (MAC-hs) entity is configured based on the HS-DSCH common system information. High speed downlink packet access (HSDPA) transmission is then received in the target cell. A CELL UPDATE message is sent to notify of a cell change. The HSDPA transmission may be received using a common H-RNTI broadcast in the system information, a reserved H-RNTI as requested in a CELL UPDATE message, or a temporary identity which is a subset of a U-RNTI. The MAC-hs entity may be reset.
Abstract:
A method and apparatus for controlling an optimization of handover procedures between universal terrestrial radio access (UTRA) release 6 (R6) cells and UTRA release 7 (R7) cells are disclosed. When a wireless transmit/receive unit (WTRU) is moving between an R6 cell and an R7 cell, or between R7 cells, a handover is initiated from a source Node-B to a target Node-B. In the R7 cell, the enhanced medium access control (MAC) functionality including flexible radio link control (RLC) protocol data unit (PDU) size and high speed MAC (MAC-hs) segmentation and multiplexing of different priority queues are supported. After the handover, a MAC layer and/or an RLC layer are reconfigured or reset based on functionality supported by the target Node-B.
Abstract:
A method and apparatus for assigning radio resources and controlling parameters for transmission over a random access channel in wireless communications by enhancing a random access channel is disclosed.
Abstract:
In a wireless communication system including at least one wireless transmit/receive unit (WTRU) and at least on Node-B (NB), a method and apparatus for preventing transmission blocking comprise triggering transmission of scheduling information (SI) when transmission of a medium access control-d (MAC-d) flow is stopped. The SI is transmitted when the triggering condition is met.
Abstract:
A method and system for autonomous channel coordination for a wireless distribution system (WDS) are disclosed. A wireless communication system includes a plurality of access points (APs) and the APs communicate each other via a WDS. A coordinated channel group (CCG) of a plurality of member APs is established. The member APs of the CCG camp on a WDS channel used for the WDS among the member APs of the CCG. One AP among the member APs of the CCG is designated as a master AP. The master AP coordinates with other member APs of the CCG for selecting and configuring the WDS channel for the CCG and addition and deletion of member APs. By allowing APs to define a CCG, changes of the WDS channel are performed autonomously while maintaining connectivity.