Patent application number | Description | Published |
20080225766 | METHOD AND APPARATUS FOR RECONFIGURING MEDIUM ACCESS CONTROL COMPONENTS IN WIRELESS COMMUNICATIONS - Methods and apparatus are disclosed to facilitate wireless communications between a wireless transmit receive unit (WTRU), legacy base stations and base stations using different operating parameters, such as evolved high speed packet access (HSPA) systems Third Generation Partnership Project ((3GPP) Release 7, Release 8 and beyond). Preferred WTRUs are configured with a medium access control (MAC) sub-layer component having a subcomponent with HARQ buffers, such as a subcomponent configured to provide MAC-es and MAC-e functionality and/or MAC-is and MACi functionality that include hybrid automatic repeat request (HARQ) processes, some of which are preferably operable with enhanced dedicated transport channels (E-DCH). The WTRUs are preferably configured such that they reconfigure their MAC subcomponents during soft handover while minimizing induced latency and data losses associated with HARQ processes. In some embodiments, the WTRUs are configured to prevent flushing of HARQ process buffers in soft handover scenarios with a Node B that does not support UL enhancements, e.g. higher order modulation (HOM). In other embodiments, flushing of HARQ processes is used but amelioration of adverse effects is addressed. | 09-18-2008 |
20080279114 | METHOD AND APPARATUS FOR PROVIDING SERVICE AVAILABILITY INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for providing service availability information includes receiving a signal transmitted from a base station. A power level and interference level of the received signal is measured and an estimate of a power level of each potentially available service based on the power level of the received signal and predetermined power offsets associated with each of a plurality of potentially available services is derived. An estimate of a signal-to-interference ratio (SIR) for each potentially available service from the estimate of a power level of each service and the measured interference level and a service availability indicator for each potentially available service by dividing the estimated SIR with a target SIR are calculated. Service availability indicators for each potentially available service are outputted. | 11-13-2008 |
20090003299 | METHOD FOR CLEAR CHANNEL ASSESSMENT OPTIMIZATION IN A WIRELESS LOCAL AREA NETWORK - A method and apparatus are directed toward optimizing clear channel assessment (CCA) parameters in a wireless local area network having an access point (AP) and at least one station. An upper bound and a lower bound for an energy detect threshold (EDT) parameter are determined. A value of the EDT parameter is calculated and is bound by the upper bound and the lower bound. The EDT parameter is updated. The method can be performed at each station or at the AP, with the updated CCA parameters being signaled to each station associated with the AP. | 01-01-2009 |
20090042583 | WIRELESS COMMUNICATION METHOD AND APPARATUS FOR IMPLEMENTING ACCESS POINT STARTUP AND INITIAL CHANNEL SELECTION PROCESSES - A startup process of an access point (AP) includes a discovery phase and an announcement phase. During the discovery phase, the AP detects neighboring APs from its own extended service set (ESS), neighboring APs from different ESSs, and external sources of interference. During the announcement phase, the AP transmits its beacon signals at maximum power in order to accelerate recognition by neighboring APs running the discovery phase. An automatic initialization channel selection process of an AP scans channels the AP will use to communicate. Information of each scanned channel is recorded and a best performance channel is determined for use by the AP. | 02-12-2009 |
20090046667 | METHOD AND APPARATUS TO REDUCE RADIO RESOURCE OVERHEAD ASSOCIATED WITH INTERMITTENT TRAFFIC - A method and apparatus for No-TX mode for a wireless transmit/receive unit (WTRU) and Node B that suspends the transmission of power control updates and associated signaling over dedicated uplink and downlink channels. Triggers and signals between the WTRU and Node B to activate and disable No-TX mode. A radio link is re-established to resume data transmission when No-TX mode is disabled, and data may also be transmitted during defined transmission opportunities while in No-TX mode. | 02-19-2009 |
20090054073 | METHOD AND SYSTEM WHEREIN TIMESLOTS ALLOCATED FOR COMMON CONTROL CHANNELS MAY BE REUSED FOR USER TRAFFIC - A method and system is disclosed wherein timeslots designated in a wireless communication system as Common Physical Channel (CPCH) timeslots may be reused for user traffic. A CPCH timeslot used in a first cell may be reused by a second cell, assuming the first and second cells transmit control information in different CPCH timeslots, for user traffic. The second cell is permitted to reuse the timeslot in which the first cell is transmitting control information so long as the second cell's reuse of that timeslot does not degrade reception of control information in the first cell. | 02-26-2009 |
20090086671 | METHOD AND APPARATUS FOR TERMINATING TRANSMISSION OF A MESSAGE IN AN ENHANCED RANDOM ACCESS CHANNEL - A method and an apparatus is provided for terminating an enhanced random access channel (E-RACH) message in an E-RACH transmission. Triggers for terminating the E-RACH message are provided. The actions upon termination of the E-RACH messages are provided to release enhanced dedicated channel (E-DCH) resources while in cell forward access channel (CELL_FACH) state or transition to cell dedicated channel (CELL_DCH) state. | 04-02-2009 |
20090086698 | METHOD AND APPARATUS FOR MANAGING A COLLISION IN COMMON E-DCH TRANSMISSIONS - A method and apparatus for managing a collision in random access channel (RACH) access transmissions are disclosed. A wireless transmit/receive unit (WTRU) transmits WTRU-dependent information to confirm that a detected acquisition indicator (AI) is intended to the WTRU. The WTRU-dependent information may be transmitted separately after detecting the AI, may be transmitted along with a RACH preamble, or may be sent in an E-RACH message. The WTRU-dependent information may be a random number, a sequence or scrambling code randomly selected from a pre-determined set of sequences or scrambling codes. Alternatively, the WTRU-dependent information may be a pre-configured identifier, or information derived from the pre-configured identifier. Alternatively, after detecting an AI, the WTRU may randomly select an enhanced dedicated channel (E-DCH) resource from a set of E-DCH resources associated with an RACH resource used for transmission of the RACH preamble and transmit an E-RACH message using the selected E-DCH resource. | 04-02-2009 |
20090103511 | METHOD AND APPARATUS FOR SELECTING A RADIO LINK CONTROL PROTOCOL DATA UNIT SIZE - A method and apparatus are used to create RLC PDUs in advance of the E-TFC selection for the MAC PDU that will include this or these RLC PDU(s). The apparatus may be configured to pre-generate RLC PDUs for transmission in a later TTI. This approach avoids the large peak processing requirement due to the tight delay constraint if any RLC PDU to be included into a MAC PDU had to be created after the determination of the size of this MAC PDU, i.e. after E-TFC selection. The method and apparatus maintain an approximate match between the size of an RLC PDU and the size of the MAC PDU it is included into. Maintaining this approximate match ensures that the RLC PDU error rate due to HARQ residual errors remains low. This approach may be designed as “semi-radio aware” or “radio-aware with delay”. | 04-23-2009 |
20090109937 | SELECTING TRANSMISSION PARAMETERS FOR CONTENTION-BASED ACCESS IN WIRELESS SYSTEMS - A method and apparatus are disclosed for selecting a channel for uplink communication includes determining whether a cell supports transmission over an enhanced random access channel (E-RACH) and selecting whether to send uplink communications over the E-RACH or a random access channel. A method for selecting a transmission time interval (TTI) for use on an E-RACH includes evaluating radio conditions measured at a user equipment and selecting a long TTI if radio conditions are bad and selecting a short TTI if radio conditions are good. Alternatively, the TTI can be selected based on an amount of data to be transmitted on the uplink. A user equipment, an integrated circuit, or a Node B can be configured to perform either method. | 04-30-2009 |
20090122757 | INTEGRATED CIRCUIT FOR OPTIMIZING ACCESS POINT CHANNEL SELECTION - A wireless communication method and system for optimizing channel selection for an AP. The channel selection optimization process includes four sub-processes: (1) a measurement process; (2) a candidate channel determining process; (3) a channel selection process; and (4) a channel update process. Candidate channels used for supporting communication performed by the AP are determined. The candidate channels are chosen from an allowable channel set (ACS) if a detected interference of each candidate channel is less than an established maximum allowed interference. | 05-14-2009 |
20090196197 | METHOD AND APPARATUS FOR PERFORMING DISCONTINUOUS RECEPTION AND DOWNLINK INTER-FREQUENCY AND INTER-RADIO ACCESS TECHNOLOGY MEASUREMENTS IN CELL_FACH STATE - A method and apparatus of performing discontinuous reception (DRX) and downlink inter-frequency and inter-radio access technology (RAT) measurements in CELL_FACH state are disclosed. While in DRX mode, a wireless transmit/receive unit (WTRU) may perform inter-frequency and inter-RAT measurements in a measurement occasion that fall into a DRX period. The WTRU may perform the measurements while T321 timer is running. The WTRU may take the measurements on first predetermined number of frame in which a DRX frame would coincide after a last reception frame if DRX operation was ongoing. The WTRU may periodically wake up for downlink reception in CELL_FACH state in accordance with a common DRX pattern that is common to all WTRUs in a cell or may wake up from DRX upon reception of the order and receiving a common traffic. | 08-06-2009 |
20090196256 | METHOD AND APPARATUS FOR ENABLING CELL RESELECTION FOR WTRU OPERATING IN DISCONTINUOUS RECEPTION - A method for discontinuous reception (DRX) implemented in a wireless transmit/receive unit (WTRU) during cell reselection including initiating cell reselection; disabling DRX operation, wherein disabling DRX operation enables continuous reception; transmitting a CELL UPDATE message; receiving a CELL UPDATE CONFIRM message; and enabling DRX operation based on the received CELL UPDATE CONFIRM message. | 08-06-2009 |
20090238144 | METHOD AND APPARATUS OF FEEDBACK SIGNALING - A method and apparatus of feedback signaling using a high speed dedicated physical control channel (HS-DPCCH) includes transmitting to a first cell a first uplink feedback signal that includes channel quality information (CQI) associated with the first cell. A second uplink feedback signal that includes CQI information associated with a second cell is transmitted to the second cell. | 09-24-2009 |
20090258666 | METHOD AND APPARATUS FOR SELECTING ENHANCED DEDICATED CHANNEL TRANSPORT FORMAT COMBINATION IN CELL_FACH STATE AND IDLE MODE - A method and apparatus for selecting an enhanced dedicated channel (E-DCH) transport format combination (E-TFC) in Cell_FACH state and idle mode are disclosed. A wireless transmit/receive unit (WTRU) transmits a random access channel (RACH) preamble and receives an index to an E-DCH resource in response to the RACH preamble. The WTRU may estimate a power headroom based on the maximum WTRU transmit power, power offset value, and the last successfully transmitted RACH preamble transmit power. The WTRU restricts an E-TFC based on the estimated power headroom, and selects an E-TFC based on a set of supported E-TFCs. The WTRU then generates, and transmits, a protocol data unit (PDU) based on the selected E-TFC. | 10-15-2009 |
20090268671 | WIRELESS COMMUNICATION METHOD AND APPARATUS FOR IMPLEMENTING ACCESS POINT STARTUP AND INITIAL CHANNEL SELECTION PROCESSES - A startup process of an access point (AP) includes a discovery phase and an announcement phase. During the discovery phase, the AP detects neighboring APs from its own extended service set (ESS), neighboring APs from different ESSs, and external sources of interference. During the announcement phase, the AP transmits its beacon signals at maximum power in order to accelerate recognition by neighboring APs running the discovery phase. An automatic initialization channel selection process of an AP scans channels the AP will use to communicate. Information of each scanned channel is recorded and a best performance channel is determined for use by the AP. | 10-29-2009 |
20090307554 | METHOD AND APPARATUS FOR PERFORMING A BUNDLED TRANSMISSION - A wireless transmit/receive unit (WTRU) may send a bundled transmission of a packet repeatedly over at least two consecutive transmission time intervals (TTIs). The WTRU may not process a hybrid automatic repeat request (HARQ) feedback for the packet after sending the bundled transmission. The bundled transmission may be configured per HARQ process. The WTRU may override the bundled transmission and may transmit a HARQ retransmission of another packet in one of the TTIs scheduled for the bundled transmission if a TTI scheduled for the HARQ retransmission of another packet overlaps the TTIs scheduled for the bundled transmission. Alternatively, the WTRU may transmit a non-bundled transmission of a packet and send a bundled HARQ transmission of the packet on a condition that HARQ feedback indicates a failure of delivery of the packet. The WTRU may not process an HARQ feedback in an E-HICH for the packet after sending the bundled transmission. | 12-10-2009 |
20110205945 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING A PACKET VIA HIGH SPEED DOWNLINK PACKET ACCESS - A method and apparatus for transmitting and receiving a packet via high speed downlink packet access (HSDPA) are disclosed. At least one HSDPA medium access control (MAC-hs) service data unit (SDU) is segmented into a plurality of segments. MAC-hs protocol data units (PDUs) are generated from the segments wherein each MAC-hs PDU includes at least one segment. Each MAC-hs PDU may include one segment from a single MAC-hs SDU. The size of the segments may match to the size of the MAC-hs PDUs minus the size of the header of the MAC-hs PDU. The sizes of the segments may be determined based on the number of segments to which the MAC-hs SDU is segmented. Alternatively, each MAC-hs PDU may include a combination of segments from a plurality of MAC-hs SDUs or a combination of at least one segment from one MAC-hs SDU and at least one entire MAC-hs SDU. | 08-25-2011 |
20120076049 | METHOD AND SYSTEM FOR PERFORMING PEER-TO-PEER COMMUNICATION BETWEEN STATIONS WITHIN A BASIC SERVICE SET - A method and system for performing peer-to-peer wireless communication between stations (STAs) within a basic service set (BSS) while maintaining connectivity with an access point (AP) in the BSS are disclosed. A source STA, an AP and a destination STA negotiate a direct link setup (DLS) channel for performing peer-to-peer communication between the source STA and the destination STA. The DLS channel may be different from a BSS channel used for communication between the AP and each of the STAs. The source STA and the destination STA then perform peer-to-peer communication on the negotiated DLS channel. | 03-29-2012 |
20120140715 | Method And Apparatus For Assigning Radio Resources And Controlling Transmission Parameters On A Random Access Channel - 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. | 06-07-2012 |
20120230310 | WIRELESS COMMUNICATION METHOD AND WLAN FOR SIGNALING DEFERRAL MANAGEMENT MESSAGES - A deferral management method is implemented in a wireless local area network (WLAN) including an access point (AP) and a plurality of wireless transmit/receive units (WTRUs). The AP sends a deferral management capabilities request message to the WTRUs to determine the deferral management capabilities of the WTRUs. In response, each of the WTRUs sends a deferral management capabilities indicator message to the AP. The AP may also send a deferral management parameter set message to the WTRUs to indicate values for setting deferral management parameters. In response, each of the WTRUs may optionally send a deferral management parameter set execution confirmation message to the AP. The WTRUs may also set the values of various deferral management parameters in accordance with a certain rule specified in a deferral management rule message sent by the AP. Optionally, the WTRUs may respond to the AP with a deferral management rule execution confirmation message. | 09-13-2012 |