Handling cell reselections and state transitions for high-speed downlink packet access

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Handling cell reselections and state transitions for high-speed downlink packet access

InterDigital Technology Corporation C. 196846

[0001] HANDLING CELL RESELECTIONS AND STATE

TRANSITIONS FOR HIGH-SPEED DOWNLINK PACKET ACCESS

[0002] FIELD OF INVENTION

[0003] The present application is related to wireless communication.

[0004] BACKGROUND

[0005] Wireless transmit receive units (WTRUs) in a UMTS TerrestrialRadio Access Network (UTRAN) can be in either of two modes: Idle orConnected. Based on WTRU mobility and activity while in connected mode, theUTRAN can direct the WTRU to transition between a number of sub-states:Cell_PCH, URA_PCH, Cell_DCH and CeUFACH. The Cell-PCH and URA^PCHstates are used to trigger cell updates on a paging channel (PCH) for a mobileWTRU. The Cell_DCH state is characterized by dedicated channels (DCHs) inboth the uplink and the downlink. On the WTRU side, this corresponds tocontinuous transmission and reception and can be demanding on user powerrequirements. The Cell_FACH state is characterized by a forward access channel(FACH) and does not use dedicated channels, thus allowing better powerconsumption, at the expense of a lower uplink and downlink throughput.

[0006] Recent work by the standardization bodies has identified thepossibility of using high speed downlink packet access (HSDPA) in Cell_FACHand Cell_PCH/ URA_PCH. HSDPA is a feature that was introduced in Release 5of the 3rd Generation Partnership Project (3GPP) specifications to operate inCell_DCH. HSDPA tries to make better use of the downlink shared capacity byusing three key concepts: Adaptive Modulation and Coding (AMC),retransmissions using a Hybrid-ARQ (HARQ) scheme, and Node B scheduling, alloperating at a very fast rate.

[0007] The following HSDPA characteristics are relevant: a. Every WTRU having a HSDPA connection is assigned a high speeddownlink scheduling channel (HS-DSCH) Radio NetworkTemporary Identifier (H-RNTI). This identifier is unique within acell find assigned by the serving Radio Network Controller (RNC). b. A WTRU is attached to a single serving cell (Node B). c. The WTRU has to receive indication of the physical channelresources to use (HS-PDSCH info), as well as how to set up theHARQ processes and the HARQ memory.

[0008] In 3GPP Release 6, HSDPA was only supported in Cell_DCH.Therefore, when moving out of CellJDCH state, all HSDPA resources had to becleared. However, with the introduction of enhanced CellJFACH the WTRU maymove from Cefl„DCH to any other state and still support HS-DSCH reception,which may not require the WTRU to clear all HSDPA resources. Therefore, anadditional condition was added to the variable HS_DSCH_RECEPTIONassociated with HS-DSCH reception in Cell_DCH. The HSDPA resources areonly cleared when the requirements to perform HS-DSCH reception are not metand the WTRU is in Cell_DCH.

[0009] It is assumed that if a WTRU supports HSDPA in Release 7, it also supports HSDPA in Cell_FACH and in Cell_PCH/URA_PCH. HS-DSCHreception in Cell_FACH can be configured without HS-DSCH reception inCell_PCH and URA_PCH. HS-DSCH reception in Cell_PCH and URA_PCHwithout the support of HS-DSCH reception in Cell_FACH is not supported. TheWTRU support for these features is signaled by the WTRU to the network.[0010] The network signals its support for enhanced Cell_FACH via theSystem Information Block (SIB5/5bis) to the WTRU. Two new informationelements (IEs) have been introduced: a. “HS-DSCH common system information” - indicating the HSDPAreception is supported for CellJFACH state; and b. “HS-DSCH paging system information” - indicating that HSDPA issupported for Cell_PCH/URA_PCH state.

To indicate whether HS-DSCH reception is ongoing in Cell_FACH, two newBoolean variables have been introduced, which are used as flags by the WTRUradio resource control (RRC) controller: a. HSJDSCH_RECEPTION_Cell_FACH_STATE: If TRUE indicatesthat HSJDSCH reception in Cefl_FACH reception is ongoing; and b. HS_DSCH_RECEPTION_OF_CCCH_OF_ENABLED: If TRUEindicates that HS-DSCH reception is enabled for CCCH. This variable is set to TRUE when the WTRU is using a common H-RNTI to receive HSDPA traffic, and is set to FALSE when theWTRU is not.

However, no new variable has been defined for HS-DSCH reception indication inCell_PCH or URAJPCH states. When in Cell_PCH or URAJPCH, and if the IE“HS-DSCH paging system information” is broadcasted, the WTRU sets upHSDPA reception.

[0011] Scenarios can occur where the WTRU transitions from Cell_DCH to a state that does not support HSDPA. For instance, the WTRU could transitionfrom Cell_DCH to Cell_FACH in a cell that does not support the EnhancedCell_FACH feature, or the WTRU could transition from CellJDCH to Cell_PCHin a cell that does not support HS-DSCH reception in Cell„PCH. In suchscenarios the HSDPA resources are not cleared and the WTRU will continue toperform HS-DSCH reception procedures. This behavior is undesirable since theWTRU will waste resources and battery while attempting to receive on thischannel. In addition, failure to clear HSDPA resources (i.e. clear IEs, releaseHARQ resources, performing enhanced high speed medium access channel (MAC-ehs) reset) is likely to cause problems when the WTRU resumes HS-DSCHreception in another state.

[0012] Similar problems occur in some scenarios of cell reselection. Forinstance, the WTRU may reselect from a cell that supports HS-DSCH in CELL toa cell that does not support the Enhanced Cell_FACH feature and the HSDPAresources are not cleared.

[0013] SUMMARY

[0014] A method and apparatus for cell reselection in 3GPP wirelesscommunication is implemented by a wireless transmit/receive unit (WTRU) thatsupports HS-DSCH reception. When in cell transition or state transition, theWTRU checks whether there is an ongoing HS-DSCH reception, and if the newcell or state cannot support HS-DSCH, then the HSDPA resources being used forthe ongoing HS-DSCH reception are released. The WTRU performs this method using radio resource control (RRC) processing, which monitors various events andconditions to make the determination whether to release HSDPA resources.

[0015] BRIEF DESCRIPTION OF THE DRAWINGS

[0016] A more detailed understanding may be had from the followingdescription, given by way of example in conjunction with the accompanyingdrawings wherein: [0017] Figure 1 shows a block diagram of a wireless transmit/receive unit(WTRU) and a various Node B candidates for cell/state reselection; [0018] Figure 2 is an example functional block diagram of a WTRU and the

Node B of Figure 1; and [0019] Figure 3 is a flow diagram of a method for implementing an RRCvariable HS_DSCH_RECEPTION_GENERAL, which tracks HS-DSCH receptionfor all states.

[0020] DETAILED DESCRIPTION

[0021] When referred to hereafter, the terminology "wirelesstransmit/receive unit (WTRU)" includes but is not limited to a user equipment(UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellulartelephone, a personal digital assistant (PDA), a computer, or any other typeof user device capable of operating in a wireless environment. When referred tohereafter, the terminology "base station" includes but is not limited to a Node-B,a long term evolution enhanced NodeB CeNB), a site controller, an access point(AP), or any other type of interfacing device capable of operating in a wirelessenvironment.

[0022] The terms "clearing and releasing of HSDPA resources" and"stopping of HS-DSCH reception procedures" are herein used interchangeably.[0023] When referred to hereafter, the terminology “3 GPP Release 7 (R7)”, includes but is not limited to a WTRU or Node B that supports HS-DSCH inCELL_FACH and/or CELL/URA_PCH and “3GPP Release 6 (R6)” includes but isnot limited to a WTRU or Node B that supports HS-DSCH in CELL_FACHand/or CELL/URA_PCH. [0024] HS-DSCH in CELL_FACH also includes HS-DSCH reception in idle mode for the reception of RRC connection procedures.

[0025] Figure 1 shows an example wireless comm uni cation system 100 ofcells 20,30 and 40, with NodeBs 120,130 and 140 respectively. A mobile WTRU110 is in communication with a serving Node B 120, and NodeBs 130 and 140 arecandidates for cell reselection. It should be noted that, although an exampleconfiguration of WTRU 110 and Node B 120 is depicted in Figure 1, anycombination of wireless and wired devices may be included in the wirelesscommunication system 100.

[0026] Figure 2 is an example functional block diagram 200 of a WTRU 110and the Node B 120 of the wireless communication system 100 of Figure 1. Asshown in Figure 2, the WTRU 110 is in communication with the Node B 120.[0027] In addition to the components that may be found in a typical WTRU, the WTRU 110 includes a processor 115, a receiver 116, a transmitter 117, andan antenna 118. The receiver 116 and the transmitter 117 are in communicationwith the processor 115. The antenna 118 is in communication with both thereceiver 116 and the transmitter 117 to facilitate the transmission and receptionof wireless data. The processor 115 of the WTRU 110 is configured to handle cellreselections and state transitions to and from an enhanced Cell_FACH state.[0028] In addition to the components that may be found in a typical NodeB, the Node B 120 includes a processor 125, a receiver 126, a transmitter 127,and an antenna 128. The receiver 126 and the transmitter 127 are incommunication with the processor 125. The antenna 128 is in communicationwith both the receiver 126 and the transmitter 127 to facilitate the transmissionand reception of wireless data. The processor 125 of the Node B120 is configuredto support enhanced Cell_FACH state.

[0029] Embodiments are disclosed that deal with state/cell transitions from a state or cell where HS-DSCH reception is possible, to a state or cell where HS-DSCH reception is not possible.

[0030] Cell reselection [0031] In this case, the WTRU is not waiting for a CELL UPDATECONFIRM from the network. That is, the WTRU is in state Cell_FACH, and makes a cell re-selection. The cell reselection process can be considered a 2-stepprocess. The first step sets up the HSDPA communication in the new cell, if thisnew cell is 3GPP R7 capable. The second step deals with the dealing ofinformation from the old cell. This second step should consider all possibletransitions that may occur: 3GPP R7 cell to R7 cell, 3GPP R7 cell to R6 Cell,3GPP R6 cell to R7 cell, and 3GPP R6 cell to R6 cell. Any time a cell reselectionto a 3GPP R6 cell occurs, any HSDPA configuration should be removed (acomplete HSDPA reset). On the other hand, if a transition is to a 3GPP R7capable cell, only a MAC-hs reset would be needed. Further, the first step shouldspecifically check that a cell reselection is occurring. The second clause is specificto cell reselection. If cell is not 3GPP R7 capable, then a complete HSDPA resetis performed (stop monitoring HS-SCCH and HS-PDSCH, mac-hs reset, release ofHARQ resources). This reset can be implemented by specifying the individualactions, or by using the variables (HS_DSCH_RECEPTION_Cell_FACH_STATE& HS_DSCH_RECEPTION_ OF_CCCH) and performing required actions.

[0032] State transitions

[0033] Transitions from Cell DCH

[0034] Transitions from Cell_DCH can be requested through a number ofRRC messages, such as:

RADIO BEARER SETUP

RADIO BEARER RECONFIGURATION

RADIO BEARER RELEASE

TRANSPORT CHANNEL RECONFIGURATION

PHYSICAL CHANNEL RECONFIGURATION

When performing procedures related to these messages, a WTRU may be askedto transition from Cell_DCH state to Cell_FACH, Cell_PCH, and URA_PCH.Depending on the cell capabilities, the states being entered can. support HSDPAor not (3GPP R7 cells support HSDPA in Cell_FACH, Cell_PCH, URA_PCH,while 3GPP R6 cells do not). As a result, any transition to a non-HSDPA statefrom a HSDPA state should result in a complete HSDPA reset (stop monitoring HS-SCCH & HS-PDSCH, mac-hs reset, release of HARQ resources). However, fortransitions to a state that supports HSDPA no reset is needed.

[0035] Currently, the resetting is performed when evaluating the variable HS_DSCH_RECEPTION. If this variable was “TRUE” and becomes “FALSE”after the evaluation, then a complete HSDPA reset is performed provided thatthe UE is in state Cell_DCH. 10036] In accordance with this embodiment, the WTRU 110 performs areset (i.e., release of HSDPA resources) in cases where the WTRU 110 moves tostates that do not support HSDPA. This can be determined from the presence orabsence of the IE "Downlink HS-PDSCH system information" or "HS-DSCHcommon system information" in System Information Block 5 and/or the presenceor absence of the IE "Downlink HS-PDSCH system information for connectedmode" in System Information Block 6.

[0037] Transitions from Cell FACH

[0038] State transitions out of Enhanced Cell_FACH state have the same issue as transitions out of CellJDCH. That is, any time a transition is to a state that does not support HSDPA, a complete HSDPA reset should be required. The resetting is performed when evaluating the variable HS_DSCH_RECEPTION_Cell_ FACH_STATE. If this variable is “TRUE” and becomes “FALSE” after the evaluation, then a complete HSDPA reset is performed provided that the WTRU is in state Cell_FACH and the variable HS_DSCH_RECEPTION_OF_CCCH is “FALSE”. This reset is also performed in cases where the WTRU 110 transitions to states that do not support HSDPA.

[0039] An explicit check of the variable is made when the WTRU 110

receives any RRC message that causes a transition from Cell_FACH to Cell_PCH or URAJPCH. This includes commands such as:

RADIO BEARER SETUP

RADIO BEARER RECONFIGURATION

RADIO BEARER RELEASE

TRANSPORT CHANNEL RECONFIGURATION

PHYSICAL CHANNEL RECONFIGURATION

CELL UPDATE CONFIRM

To determine whether or not the state to which the WTRU 110 transitionedsupports HSDPA, the WTRU 110 can use the presence or absence of the IE "Downlink HS-PDSCH system information” or "HS-DSCH common systeminformation" in System Information Block 5 and/or the presence or absence of theIE "Downlink HS-PDSCH system information for connected mode" in SystemInformation Block 6.

[0040] General overview [0041] The WTRU 110 clears HSDPA resources and stops HS-DSCHreception procedures when the WTRU 110 moves from a state or cell in which itis performing HS-DSCH reception (e.g., a 3GPP Release 7 capable state or cell) toa state or cell in which it no longer supports HS-DSCH reception (e.g., a 3GPPRelease 6 capable state or cell).

[0042] When the WTRU 110 attempts to establish a HSDPA connection as a result of a state transition, and/or cell change (cell re-selection), and theconditions required to perform HS-DSCH reception are not met, the WTRU 110clears the HSDPA resources. The WTRU 110 can always clear the HSDPAresources or it clears HSDPA resources only if the previous state or cell had anongoing HS-DSCH reception procedure.

[0043] The actions related to clearing of HSDPA resources and stoppingHS-DSCH reception procedures include, but are not limited to the following: stopping any HS-SCCH reception/monitoring procedures;stopping any HS-DSCH reception/monitoring procedures;clearing the variable H_RNTI and remove any stored H- RNTI; resetting the MAC-hs/ehs entity; andreleasing all HARQ resources.

[0044] If more resources are added to the HS-DSCH connection procedures, the WTRU 110 may also clear those resources. For example, the WTRU 110 mayalso need to clear the common H-RNTI values or any IEs stored (e.g., HARQinfo).

[0045] Checking if HS-DSCH reception is ongoing[0046] In some scenarios, the WTRU 110 needs to check if there is anongoing HS-DSCH reception procedure (i.e., prior to state transition,configuration, cell reselection, and the like). In order to check if there is an ongoing HS-DSCH reception procedure, one or a combination of the followingprocedures may be used: [0047] A new Boolean HS-DSCH reception variableHS.DSCH.RECEPTION. GENERAL may be defined by the processor 115 usedfor the radio resource control (RRC) processing, and used to act as a flag toindicate whether HS-DSCH reception is ongoing in any of the four statesCell_FACH, Cell.DCH, CellJPCH, URA_PCH. For example, this may beimplemented by a RRC controller function in the processor 115. The variable isset to TRUE when HS-DSCH reception is supported and started in any state, andit is set to FALSE when stopping HS-DSCH reception and/or when HS-DSCHreception is not supported.

[0048] A new state variable HS.DSCH.RECEPTION.PCH.STATE forCell_PCH/URA_PCH state may be defined by the processor 115 for RRCprocessing (e.g., in a RRC controller function of the processor 115) and used tocheck if HS-DSCH reception is ongoing in the Cell_PCH/URA_PCH state.[0049] The existing HS_DSCH reception variables(HS.DSCH.RECEPTION, HS.DSCH.RECEPTION.Cell.FACH.STATE,HS.DSCH.RECEPTION.OF.CCCH.ENABLED, or HS.DSCH. RECEPTION.PCH. STATE) may also be used if applicable. If any of these variables is set toTRUE, it means that a HS-DSCH reception procedure is ongoing. For example, ifthe WTRU 110 is in Cell.FACH and wants to know if HS-DSCH reception isongoing, in addition to the state variable (i.e. HS.DSCH.RECEPTION.Cell.FACH.STATE), the WTRU 110 also checks all other HS-DSCH receptionvariables.

[0050] A MAC-ehs state indication may be used to denote ongoing HSDPA reception. This could include a newly defined state indicator, special reservedvalues for MAC-ehs state variables (next.expected.TSN, Tl), or whether anyHARQ resources have been configured. Only the last option is included in theembodiments using a MAC-ehs state indication. For proper operation of the stateindication, the HARQ resources should be cleared when not using HSDPA. [0051] Conditions for releasing HS-DSCH recources [0052] The proper behavior of the WTRU 110 may be defined according to one or a combination of the following RRC procedures in the processor 115. TheWTRU 110 first checks for the following HS-DSCH reception criteria, which ismonitoring whether any of the following events have occurred: a. State transitions due to RRC reconfigurations, RRC setup, RRCrelease messages: i. CeU_DCH to CeU_FACH, CeU_PCH, or URA_PCH; ii. Cell.FACH to Cell_PCH, or URA_PCH; b. Cell Update and cell reselection cases: i. Radio Link failure (from Cell_DCH to CellJFACH); ii. Cell reselection from Cell_FACH to Cell_FACH; iii. Cell reselection from Cell_PCH to Cell_FACH; c. Cell reselection in idle mode while waiting for RRC CONNECTIONSETUP message (i.e. resending RRC CONNECTION REQUESTdue to cell reselection): i. Cell reselection in URA_PCH (i.e. when reading theSIB5/5bis and SEB6/6bis); d. Timer T302 expiry of cell reselection;

Alternatively, this check may done in other procedures and cases where theWTRU 110 check for HS-DSCH reception is supported (i.e. reading of SIB5/5bis,SIB 6/6bis actions).

[0053] The WTRU 110 further checks the following conditions to ascertain whether HS-DSCH reception is supported in the new state:

Following a state transition to Cell_FACH state, the WTRU 110 checks: for TDD; or for FDD, if the WTRU does not support HS-DSCH reception; orif the IE "HS-DSCH common system information" is not included inSystem Information Block type 5 or System Information Block type5his

Following a state transition to Cell_PCH or URA_PCH, the WTRU 110 checks:for TDD; or WO 2008/134710. for FDD, if the WTRU does not support HS-DSCH reception; orif the IE "HS-DSCH paging system information" is not included.

When one of these above conditions is TRUE, the WTRU 110 takes the action ofclearing the HSDPA resources. As a first variation, the HSDPA resources mayalways be cleared upon satisfying any of the above conditions. As a secondvariation, the HSDPA resources are cleared upon any of the above conditions andif HS-DSCH reception was previously ongoing in any of the other states prior tothe start of the RRC procedure.

[0054] In order to check if the WTRU 110 supports HS-DSCH reception in CELL_FACH and/or CELLJPCH/URA_PCH, an additional WTRU capability maybe added, instead of just checking whether the WTRU 110 supports HS-DSCHreception. For example, the following additional WTRU capabilities may beadded to the RRC procedure: a. HS-DSCH support in CellJFACH (i.e., only for Cell_FACH); b. HS-DSCH support in Cell_PCH or URA_PCH (which also impliesHS-DSCH support in CellJFACH).

If such capabilities are added, the WTRU 110 would perform these checks as partof the steps described above.

[0055] Actions related to clearing HSDPA resources [0056] To perform the actions related to clearing HSDPA resources, theWTRU processor 115 executes one or a combination of the following: a. Clearing HSDPA resources when the when the conditions to startHS-DSCH reception are not met. b. When HS-DSCH reception criteria are not met AND if HS-DSCHreception is ongoing for the current state of the WTRU 110 (i.e.HSJDSCH_RECEPTION_GENERAL set to TRUE), then thevariable HS_DSCH_RECEPTION_GENERAL is set to FALSE andHSDPA resources are cleared. c. Evaluate and perform the actions corresponding to the existing HS-DSCH reception variables or any newly introduced variable (i.e. forCell_PCH/URA_PCH). The variables to be evaluated can be one ora combination of the following: i. HSJDSCH_RECEPTION variable; ii. HS_DSCH_RECEPTION_Cell„FACH_STATE variable;rii. HS_DSCH_RECEPTION_OF_CCCH_ENABLED variable; or

iv. A variable for Cell_PCH/URA_PCH

If the conditions to set one of these variables to TRUE are not met,the WTRU 110 may use one of the procedures described herein tocheck if there is an ongoing HS-DSCH reception. If there is anongoing HS-DSCH connection, then the WTRU may release allHSDPA resources. Alternatively, the WTRU may release allHSDPA resources whenever the variable which is being evaluatedis set to FALSE. d. The evaluation and actions corresponding to variables of HS-DSCHreception in CellJFACH and Cell_PCH/URA_PCH are only donewhen the conditions to perform HS-DSCH reception are met. Aspart of this option, these variables and/or actions are executed evenwhen the conditions are not met in the procedures described above. e. In addition to one of the changes performed above, the actionsrelated the HS_DSCH_RECEPTION variable for Cell.DCH can bemodified to clear the resources if the conditions to perform HS-DSCH reception in Cell_FACH and Cell_URA/Cell_PCH are notmet. This will only solve one of the problems identified (moving outof Cell„DCH to any other state).

[0057] The above methods described for checking if HS-DSCH reception is ongoing, performing RRC actions, and performing the actions related to HSDPAclearing may be combined together to solve the problems identified.

[0058] HSDPA variable applicable to all states [0059] The Boolean variable HS_DSCH_RECEPTION_GENERAL is set to

TRUE depending on whether the WTRU 110 has been configured to start HS-DSCH reception. When the WTRU 110 first powers up, this variable is set toFALSE. As part of the idle mode procedure, the WTRU 110 then sends a RRCConnection request message. When the message is sent, the WTRU 110processes the received downlink to confirm that the network supports HS-DSCH (e.g., by checking flags in the SIB5/5bis). If HS-DSCH is supported, the WTRU110 performs actions associated with HSJDSCH_RECEPTION_OF_CCCHvariable: if TRUE, then it means that HS-DSCH reception is ongoing.Accordingly, the variable HS_DSCH„RECEPTION_GENERAL is also set toTRUE. The HS_DSCH_RECEPTION_GENERAL is set to TRUE in any of thefour states, when the conditions to start HS-DSCH reception are met. Below aredescribed instances when the variable is set to TRUE, The variableHS_DSCH_RECEPTION_GENERAL is defined and controlled by the WTRUprocessor 115, the variable acting as a flag to indicate whether HS-DSCHreception is ongoing in any of the four states Cell_DCH, Cell_FACH, Cell_PCHand URA_PCH. The WTRU 110 relies on this variable to check if there is anongoing HS-DSCH reception procedure. If the variable HS_DSCH_RECEPTION_GENERAL is set to TRUE, it implies that there is anongoing HS-DSCH reception procedure. If the WTRU 110 cannot support HS-DSCH reception in the new state/cell upon state/cell transition, the WTRU 110clears all HSDPA resources and sets the variableHS_DSCH_RECEPTION_GENERAL to FALSE. In order to ensure that thisvariable is properly set at all times, this variable is set based on the actionsassociated with HS-DSCH reception in all the states.

[0060] The HS_DSCH_RECEPTION_GENERAL variable is set to TRUEwhen any of the requirements to setup HS-DSCH reception in the appropriatestates are met and the HS-DSCH reception is started. This can happen in any ofthe following cases: a. HS_DSCH_RECEPTION is set to TRUE in Cell_DCH; b. HS_DSCH_RECEPTION_Cell_FACH_STATE is set to TRUE inCell_FACH; c. HS_DSCH_JRECEPTION_OF_CCCH_ENABLED is set to TRUE inCellJFACH and idle when the WTRU has a common H-RNTI; d. Actions related to HS-DSCH reception in Cell_PCH/URA_PCH areexecuted and the conditions are met; and e. the IE "HS-DSCH common system information" is included inSystem Information Block type 5 or System Information Block type 5bis (e.g., during Radio Bearer Setup, Radio BearerReconfiguration, Radio Bearer Release, Transport channelReconfiguration, or PHY channel reconfiguration.

When the above requirements associated with the HS-DSCH reception variablesfor the different states are not met and any of the above mentioned HS-DSCHreception variables are set to FALSE, the HS_DSCH_RECEPTION_GENERALshould also be set to FALSE.

[0061] Additionally, if the existing variables are modified or an additionalvariable is added for the states Cell_PCH and URA_PCH, the setting ofHS_DSCH_RECEPTION_ GENERAL may be correlated to the setting of themodified or new variables, as described above. Whenever HS-DSCH reception isproperly setup, the variable HS_DSCH_RECEPTION_ GENERAL is set toTRUE. Whenever HS-DSCH reception is stopped and/or not supported in thestate/cell WTRU is operation on, it should be set to FALSE.

[0062] Actions related to variable HS DSCH RECEPTION GENERAL[0063] When the WTRU 110 is performing initiation procedures related to acquiring system information to setup in the new cell or the new state, theWTRU 110 checks if HSDPA is supported. When HS-DSCH reception is notsupported, the WTRU 110 performs secondary common control physical channel(S-CCPCH) selection, and the WTRU 110 may clear HS-DSCH resources if anHS-DSCH reception procedure is ongoing, and the WTRU 110 sets theHS_DSCH_RECEPTION_GENERAL variable to FALSE.

[0064] The WTRU 110 can check if HS-DSCH reception is ongoing bychecking the variable HS_DSCH_RECEPTION_GENERAL. If this variable is setto TRUE, and the WTRU 110 does not support HSDPA in the its currentstate/cell (i.e., the new state/cell upon transition), the WTRU sets this variable toFALSE, and performs the following steps related to clearing HSDPA resources: a. stop any HS-SCCH reception procedures; b. stop any HS-DSCH reception procedures; c. clear the variable H_RNTI and remove any stored H-RNTI; d. reset the MAC-hs entity; e. release/reset all HARQ resources; WO 2008/134710. f. clear any stored IEs HARQ information.

For TDD and for FDD, whenever the variable HS_DSCH_RECEPTION-GENERAL is set to FALSE, the WTRU 110: - does not perform a HS_SCCH reception procedure; - does not perform a HSJDSCH reception procedure.

It should be noted that if any criteria changes for checking for support of HS-DSCH reception for the cell and WTRU, the above described proceduresassociated with WTRU 110 actions to clear HSDPA resources according to thevariable HS_DSCH_RECEPTION_GENERAL may still be applied.

[0065] For the above scenarios under this embodiment, the WTRU 110ensures that the HS_DSCH_RECEPTION_GENERAL variable is set to FALSE.Optionally, the WTRU 110 can also ensure that all other HS-DSCH variables arealso set to FALSE. In addition, the WTRU 110 releases any HSDPA resourcesand stops HS-DSCH reception procedures, if any HS-DSCH reception is ongoing.The HS_DSCH_RECEPTION„ GENERAL variable is also set to FALSE whenthe WTRU is entering UTRA RRC connected mode when not otherwise stated inthe RRC procedure, and when the WTRU is leaving UTRA RRC connected mode.[0066] Figure 3 shows a flowchart of a method 300, which as an example of an implementation of the RRC variable HS_DSCH_RECEPTION_GENERALaccording to the above description. The WTRU 110 begins checking conditions forthe variable HS_DSCH_RECEPTION_GENERAL (301), which comprises thefollowing checks. If the cell or state in which the WTRU has transitioned to doesnot support HS-DSCH (302), then the variableHS_DSCH_RECEPTION_GENERAL is checked for TRUE (306). If the variableis TRUE, the variable is set to FALSE (307) and the HSDPA resources arereleased (308). If HS-DSCH reception is supported (302), and if the WTRU 110 isnot in one of the paging states (Cell_PCH/URA_PCH) (303), then the WTRUchecks the SIB5/5bis for presence of the IE HS-DSCH common systeminformation (305). If this IE is not present, and the variableHS_DSCH_RECEPTION_GENERAL is TRUE (306), then the variableHS_DSCH_RECEPTION_GENERAL is set to FALSE (307) and HSDPAresources are released (308). If the WTRU 110 is in a paging state (Cell_PCH/URA_PCH) (303) and the IE HS-DSCH paging system information isnot included in the SIB5/5bis, then variable HS_DSCH_RECEPTION_GENERALis checked for whether it is set to TRUE (306). If TRUE, then variableHS_DSCH_RECEPTION_GENERAL is set to FALSE (307) and HSDPAresources are released (308).

[0067] HSDPA variable applicable to Paging Channel [0068] In another embodiment, a new variable for Cell_PCH/URA_PCH is introduced. The new variable HS_DSCH_RECEPTION_PCH_STATE is used toindicate if HS-DSCH reception is ongoing in Cell_PCH or URA_PCH. In thisembodiment, a variable for each state may exist, and the variables are used toevaluate and indicate if HS-DSCH reception is supported when entering a newstate.

[0069] The WTRU 110 evaluates and performs the actions associated with the following HSJDSCH reception variables that correspond to the state theWTRU 110 is entering: a. HS_DSCH_RECEPTION_OF_Cell_FACH_STATE; b. HSJ3SCH_RECEPTION_OF_CCCHJ5NABLED is only evaluatedwhen the WTRU 110 moves or stays in CellJFACH state; c. HS_DSCHJRECEPTION_PCH_STATE is evaluated and actionsare performed when entering or staying in Cell_PCH state; or d. HS_DSCH_RECEPTION is evaluated only when moving or stayingor reconfiguring in Cell_DCH.

[0070] The WTRU 110 has to evaluate these four variables when HS-DSCH reception criteria is not fulfilled and when it is fulfilled. The rationale behind thisprocedure is that, when leaving a state or cell, the WTRU 110 may not know inadvance if HS-DSCH reception is supported in the new state or cell. However,when entering the state or cell the WTRU 110 will know the results andcapabilities of the state/cell and it can also know what it was previouslysupporting.

[0071] When evaluating the variables, if the requirements to enable HS-DSCH reception in the final state are not met, the actions associated to thevariable not being TRUE should be executed. These actions correspond to WO 2008/134710. clearing of HSDPA resources. However, in order for the WTRU 110 to knowwhether HS-DSCH reception was ongoing prior to state transition or cellreselection, the WTRU 110 checks if any of the other HS_DSCH variablescorresponding to its own state and to the other states are set to TRUE at thetime. This is an indication that the WTRU 110 had an ongoing HS-DSCHconnection and thus it should clear the resources since it cannot supportHS_DSCH reception.

[0072] In addition to clearing the HSDPA resources, the WTRU 110 alsoensures that all other HS_DSCH reception state variables are set to FALSE.Further, the WTRU 110 performs the following: - stop any HS_SCCH reception procedures; - stop any HS-DSCH reception procedures; - clear the variable H_RNTI and remove any stored H-RNTI; - reset the MAC-ehs entity; - release all HARQ resources; and - clear any stored IEs HARQ info.

[0073] Optionally, to check if an HS-DSCH reception procedure wasongoing the WTRU 110 may also use the HS„DSCHJRECEPTION_GENERALvariable that it is set forth herein. When the HS-DSCH reception state variablebeing evaluated is set to FALSE and the HS_DSCH_RECEPTION_GENERAL isset to TRUE, the actions associated to clearing the resources are cleared and thevariables are set to FALSE.

[0074] Modification of HS-DSCH reception variables.

[0075] The following are modifications to the existing HS-DSCH reception variables with respect to the paging channel states: a. A new variable HS_DSCH_RECEPTION_PCH_STATE ismonitored for URA_PCH and CELL_PCH states; b. For the case where HS„DSCH_RECEPTION_OF_CCCH_ENABLED and HS_DSCH_RECEPTION_PCH_STATE isset to FALSE, and any of the four variables indicate that HS-DSCH reception is ongoing, the resources are cleared; c. The WTRU 110 checks HS_DSCH_RECEPTION and HS_DSCH_RECEPTION_OF_CELL_FACH_STATE if any of thefour variables are set to TRUE.

In the case where HS_DSCH_RECEPTION_GENERAL is used to indicate if HS-DSCH reception is ongoing, the actions related to checking if any of the four (4)HS-DSCH reception variables are set to TRUE, are replaced by the action of onlychecking if HS_DSCH_RECEPTION_GENERAL is set to TRUE.

[0076] With respect to the HS_DSCH reception variable for pagingchannels, variable HS_DSCH_RECEPTION_PCH_STATE is set to TRUE if HS-DSCH reception in CELL_PCH or URAJPCH is ongoing. The variableHS_DSCH_RECEPTION_ PCH_STATE is set to FALSE when the WTRU 110 isentering UTRA RRC connected mode when not otherwise stated in the procedure,when the WTRU 110 is leaving UTRA RRC connected mode, and when theWTRU 110 is entering CELL_FACH and CELL_DCH.

[0077] Additional modifications [0078] Some additional modifications may be necessary if the WTRU 110 uses the HS-DSCH reception variables of other states as an indication of anongoing procedure.

[0079] Note that this modification may apply to other embodiments thatalso rely on the other state HS-DCH reception variables for an in indication thatHS-DSCH reception is ongoing. In the case where theHS_DSCH_RECEPTION_GENERAL variable is used as an indication thesemodifications are not required.

[0080] The following modifications may be optionally implemented: 1. The WTRU 110 does not evaluate the actions related toHS_DSCH_RECEPTION when moving out of Cell_DCH; 2. if any IEs related to HS-DSCH are stored in the WTRU 110clear any stored IE "Downlink HS-PDSCH information".

[0081] The WTRU 110 does not set the HSJDSCHJRECEPTION_OF_CCCH_ ENABLED to FALSE right away upon entering the following sections.[0082] The variable is set to FALSE only if the conditions to startperforming HS-DSCH reception with a dedicated H-RNTI are successfully performed, otherwise it will be set to FALSE when the WTRU 110 fails toperform a HS-DSCH reception procedure.

[0083] Alternatively, the WTRU 110 ensures that the HS-DSCH reception variables are set to FALSE when moving out of a state. For example, thevariable HS_DSCH_RECEPTION_CeU_FACH_STATE is set to FALSE whenmoving out of Cell_FACH. However, this should also be done after theconfiguration of the other state is completed.

[0084] Clearing HSDPA resources during cell/state transitions[0085] In this embodiment the existing HS-DSCH reception variables aremodified such that when transitioning between cells and states, the HS-DSCHreception procedures are stopped.

[0086] When moving out of Cell_DCH, the WTRU 110 clears the HSDPA resources if the WTRU 110 is moving to a state that HS-DSCH reception is notsupported. More specifically, the HS_DSCH_RECEPTION variable is modifiedsuch that the WTRU 110 can check if HS-DSCH reception will be supported inthe other states by the WTRU 110 and the network. This may be done bychecking one or a combination of the following conditions: 3. WTRU 110 does not support HS-DSCH reception; 4. Alternatively, if additional WTRU 110 capabilities areadded (such as WTRU 110 supports HS-DSCH receptiononly in Cell_FACH and WTRU 110 supports HS-DSCHreception in Cell_PCH and in Cell_FACH) the WTRU 110may check for these specific conditions in the respectivestates; 5. IE “HS-DSCH common system information” is not includedin the SIB5/5bis; 6. For Cell_PCH and URA_PCH, the IE “HS-DSCH pagingsystem information" is not included in SEB5/5bis.

If one of the above conditions is TRUE, the WTRU 110 clears all HSDPAresources. This will guarantee that moving from Cell_DCH to any other non-HSDPA state will free all resources and stop HS-DSCH reception procedures. [0087] In addition, when moving from Cell_PCH or URAJPCH state toCellJFACH state due to cell re-selection, the WTRU 110 requires an indicationwhether HS-DSCH reception procedure is ongoing. This is required, if theWTRU 110 transitions to another state or perfonns cell reselection to a cell thatdoes not support HS-DSCH reception. The WTRU 110 should be able to detectthat HS-DSCH reception is ongoing and that HSDPA resources are to be cleared.This may be done by the addition of a new HS_DSCH_RECEPTION_PCH_STATE variable that is set to TRUE when the WTRU 110 meets theconditions to start HS-DSCH reception. The variable will be set to FALSE whenHS-DSCH reception is stopped.

[0088] When performing state transitions and cell re-selections to statessuch as Cell_FACH, URA_PCH, and Cell_PCH, the conditions to perform HS-DSCH receptions are checked. If they are not met, in addition to performing S-CCPCH reception, the WTRU 110 also performs one of the following: 7. Evaluate the variableHS_DSCH_RECEPTION_OF_Cell_FACH_STATE andperform the corresponding actions: if the requirements arenot met and if HS-DSCH reception is ongoing, the HSDPAresources are to be cleared; 8. In order to be able to assess if there are any ongoing HS-DSCH procedures in the current state or in the otherstates, additional checks should be performed. Forexample, the WTRU 110 should also check if theHS_DSCH_RECEPTION_OF_CCCH_ENABLED orHS_DSCH_RECEPTION_PCH_STATE orHS_DSCH„RECEPTION_Cell_FACH_STATE is set toTRUE. If any of the variables are set to TRUE then theWTRU 110 clears the resources and sets all the variablesto FALSE; 9. The WTRU 110 does not need to check ifHS_DSCH_RECEPTION_OF_CCCH_ENABLED is set to FALSE, when evaluating the need to clear HS-DSCHresources. 10. Evaluate the variable HS_DSCH_RECEPTION_OF_CCCH_ENABLED.Additional actions related to the case where the conditionsrequired to setup HS-DSCH reception are not fulfilled.

[0089] The WTRU 110 should be capable of checking if any of the HS-DSCH reception variables are set to TRUE (i.e. indicating that HS-DSCHreception is ongoing).

[0090] If any variables are set to TRUE, the WTRU 110 should clear allresources and set all the variables to FALSE, evaluate a variable and performactions according to one of the procedures specified in any of the previousembodiment or as in the specification [0091] Lastly, the WTRU 110 must ensure that the variables are set toFALSE when stopping HS-DSCH reception in one state (i.e. when changing fromcommon to dedicated H-RNTI, when changing states, and when changing cells),[0092] Releasing resources when HS-DSCH reception conditions not met[0093] In another embodiment, the WTRU 110 always releases theresources when the conditions to perform HS-DSCH reception are checked andnot fulfilled. Optionally, the WTRU 110 could use a MAC-ehs state indication(e.g. HARQ configured) to determine whether or not the WTRU 110 has anongoing HSDPA setup.

[0094] The proper behaviour when stopping HS-DSCH operation should be specified wherever the following conditions are checked: > for TDD; or > for FDD, if the WTRU 110 does not support HS-DSCH reception; or > if the IE "HS-DSCH common system information" is not included inSystem Information Block type 5 or System Information Block type 5bis; or > for TDD; or > for FDD, if the WTRU 110 does not support HS-DSCH reception; or > if the IE "HS-DSCH paging system information" is not included.

These conditions are checked in various places, including the following: • System Information Block 5 and 5bis • System Information Block 6 • Reception of a Setup/Reconfiguration/Release message by the WTRU110 • Cell Update, initiation • Reception of Cell Update Confirm message by the WTRU 110 • Timer T302 expiry or cell reselection • Initiation (RRC CONNECTION REQUEST)

• Reception of an RRC CONNECTION SETUP

When one of these above conditions is satisfied, the proper WTRU 110 behaviouris as follows: > stop any HS-SCCH reception procedures; > stop any HS-DSCH reception procedures; > clear the variable H_RNTI and remove any stored H-RNTI; > reset the MAC-ehs entitys; > release all HARQ resources; > clear any stored IEs HARQ info.

[0095] Alternatively, the following exemplary instructions for the WTRU110 clear the HSDPA resources only if HS-DSCH reception is ongoing bychecking if any of the state variables are set to TRUE.

[0096] Release of HSDPA resources

If one of the variables HS_DSCH_RECEPTIONCell_FACH_STATE_ENABLEDor HSJISCH__RECEPTION or HS_DSCH_RECEPTION_OF_CCCH_ENABLEDor HS„DSCH_RECEPTION_PCH_STATE_ is set to TRUE, the WTRU 110 shall: 11. set the variables HS_DSCH_RECEPTION_Cell_FACH_STATE, HS„DSCH_RECEPTION, HS_DSCH_RECEPTION_OF_CCCH_ENABLED, andHSJDSCH_RECEPTION_PCH_STATE to FALSE; 12. stop any HS_SCCH reception procedures; 13. stop any HS-DSCH reception procedures; 14. clear the variable H_RNTI and remove any stored H-RNTI; 15. reset the MAC-ehs entity; 16. release all HARQ resources; and 17. clear any stored EEs HARQ info.

[0097] EMBODIMENTS 1. A wireless transmit receive unit (WTRU) configured to operate in anhigh speed data packet access (HSDPA) mode in a cell or a state and to clearHSDPA resources when moving out of the cell or the state. 2. The WTRU of embodiment 1 wherein the WTRU is configured toclear HSPDA resources when conditions to perform high speed downlink sharedchannel reception are not met. 3. A WTRU as in any one of all preceding embodiments, wherein theWTRU is further configured to perform one or more of the following proceduresfor clearing HSDPA resources when leaving a cell or a state: stop high speed synch control channel (HS-SCCH) reception;stop high speed downlink shared channel (HS-DSCH) reception;clear radio network temporary identifiers (RNTIs);reset a medium access control (MAC) entity; release hybrid automated response request (HARQ) resources; andclear any stored information elements related to HARQinformation. 4. A WTRU as in any one of all preceding embodiments wherein theWTRU is further configured to check for ongoing HS-DSCH reception. 5. A WTRU as in any one of all preceding embodiments wherein theWTRU is further configured to check a single Boolean HS-DSCH receptionvariable to determine HSDPA reception in any of the states. 6. A WTRU as in any one of all preceding embodiments wherein thereception variable equals ''TRUE11 for HS-DSCH support and "FALSE" for no HS-DSCH support. 7. A WTRU as in any one of all preceding embodiments wherein theWTRU is configured to read a CELL/URA_PCH variable to determine HS-DSCHreception. 8. A WTRU as in any one of all preceding embodiments wherein theWTRU is configured to read a MAC state indicator to determine HS-DSCHreception. 9. A WTRU as in any one of all preceding embodiments wherein theWTRU is configured to read a plurality of information elements (IEs) todetermine HS-DSCH reception. 10. The WTRU as in embodiment 9 wherein the IEs are Radio ResourceControl (RRC) messages. 11. The WTRU as in embodiment 10 wherein HS-DSCH support isincluded in CELL_FACH state and CELL/URA_CPH state. 12. A WTRU as in any one of all preceding embodiments wherein theWTRU is further configured to read an IE variable for clearing HSPDA resources. 13. The WTRU as in embodiment 12 wherein, if the IE variable is"FALSE" the WTRU is configured to clear HSDPA resources. 14. A WTRU as in any one of the preceding embodiments wherein theWTRU is configured to read a Boolean variable HS_DSCHJRECEPTION_GENERAL to determine HS-DSCH reception. 15. The WTRU as in embodiment 14 wherein, if the variableHS_DSCH_RECEPTION_GENERAL is true, HS-DSCH reception is ongoing. 16. The WTRU as in embodiment 15 wherein the WTRU is configured toclear HSDPA resources and set variable HS_DSCH_RECEPTION_GENERAL toFALSE if HS-DSCH the WTRU is not configured to support HS-DSCH reception. 17. The WTRU as in embodiment 15 wherein:HS_DSCH_RECEPTION_GENERAL is set to true whenHS_DSCH_RECEPTION variables are set to TRUE in CELL_FACH andCELL_DCH modes. 18. A WTRU as in any one of all preceding embodiments wherein theWTRU is configured to check if HSPDA is supported when the WTRU isacquiring system information for new cell setup. 19. The WTRU as in embodiment 18 wherein the WTRU is configured toperfonn secondary common physical channel selection when the WTRU is notconfigured to support HD-DSCH. 20. The WTRU is in any one of all preceding embodiments wherein theWTRU is configured to read a HS_DSCH_RECEPTION_FOR_PAGING variablewhen the WTRU is configured in CELL_PCH mode or URA_PCH mode todetermine HS-DSCH reception. 21. The WTRU as in embodiment 20 wherein the WTRU is configured toevaluate and perform actions associated with the HS-DSCH variablecorresponding to a state that the WTRU is entering. 22. A WTRU as in embodiments 20 or 21 wherein the WTRU isconfigured to evaluate variables when HS-DSCH reception criteria is fulfilled ornot fulfilled. 23. A WTRU as in embodiment 20, 21 or 22 wherein the WTRU isconfigured to clear HSDPA resources when requirements to enable HS-DSCHreception in a final state are not met. 24. A WTRU as in any one of embodiments 20-23 wherein the WTRU isconfigured to read four variables to determine HS-DSCH reception and whereinthe four variables are: HS_DSCH_RECEPTION_CELL_FACH„STATE_ENABLED; HS_DSCH_RECEPTION; HS_DSCH_RECEPTION_OF_CCCH_ENABLED; andHS_DSCH_RECEPTION_PCH_STATE. 25. The WTRU as in embodiment 24 wherein the WTRU is configured toread the four variables when an IE "HS-DSCH paging system information" doesnot appear in a system information block (SIB) 5 or 5bis. 26. A WTRU as in any one of embodiments 20-25 wherein the WTRU isconfigured to not read HS_DSCH_RECEPTION when moving out of CELLJDCHstate. 27. A WTRU as in any one of embodiments 20-26 wherein the WTRU isconfigured to clear any stored IE "Downlink HS-PDSCH Information" if an IErelated to HS-DSCH is stored in the WTRU. 28. A WTRU as in any one of embodiments 20-27 wherein the WTRU isconfigured to set HS-DSCH reception variables to "FALSE" when moving out of astate. 29. A WTRU as in any one of all preceding embodiments wherein theWTRU is configured to stop HS-DSCH procedures when transitioning betweencells and states. 30. The WTRU as in embodiment. 29 wherein the WTRU is configured toread a HS_DSCH_RECEPTION variable to determine HS-DSCH reception inother states. 31. The WTRU as in embodiment 29 or 30 wherein the WTRU isconfigured to read an "HS-DSCH common system information" IE parameter anda l,HS-DSCH paging system information” parameter to determine HS-DSCHreception. 32. A WTRU as in embodiments 29, 30 or 31 wherein the WTRU isconfigured to read a "HS_DSCH_RECEPTION_PCH_STATE" parameter todetermine HS-DSCH reception. 33. A WTRU as in any one of all preceding embodiments wherein theWTRU is configured to read a MAC state indicator to determine HS-DSCHreception. 34. A method for implementation by a wireless transmit/receiv unit(WTRU) operating in an high speed data packet access (HSDPA) mode in a cell ora state and clearing HSDPA resources when moving out of the cell or the state. 35. The method of embodiment 34 wherein the WTRU is configured toclear HSPDA resources when conditions to perform high speed downlink sharedchannel reception are not met. 36. A method as in any of embodiments 34-35, further comprising:stopping high speed synch control channel (HS-SCCH) reception;stopping high speed downlink shared channel (HS-DSCH) reception;clearing radio network temporary identifiers (RNTIs);resetting a medium access control (MAC) entity; releasing hybrid automated response request (HARQ) resources; and clearing any stored information elements related to HARQinformation. 37. A method as in any one of embodiments 34-36 further comprisingchecking for ongoing HS-DSCH reception. 38. A method as in any one of embodiments 34-37, further comprisingchecking a Boolean HS-DSCH reception variable to determine ongoing HSDPAprocessing. 39. A method as in any one of embodiments 34-38 wherein the receptionvariable equals "TRUE" for HS-DSCH support and "FALSE" for no HS-DSCHsupport. 40. A method as in any one of embodiments 34-39 wherein the WTRUreads a CELL.PCH or a URA_PCH variable to determine ongoing HS-DSCHreception. 41. A method as in any one of embodiments 34-40 wherein the WTRUreads a MAC state indicator to determine ongoing HS-DSCH reception. 42. A method as in any one of embodiments 34-41 wherein the WTRUreads a plurality of information elements (IEs) to determine HS-DSCH reception. 43. The method as in embodiment 42 wherein the IEs are RadioResource Control (RRC) messages. 44. The method as in embodiment 43 wherein HS-DSCH support isincluded in CELL.FACH state and CELL/URA.CPH state. 45. A method as in any of embodiments 34-44 further comprisingreading an IE variable for clearing HSPDA resources. 46. The method as in embodiment 45 wherein, if the IE variable is"FALSE" the WTRU clears HSDPA resources. 47. A method as in any of embodiments 34-46 wherein the WTRU readsa Boolean variable HS.DSCH.RECEPTION.GENERAL to determine HS-DSCHreception. 48. The method as in embodiment 47 wherein, ifHS.DSCH.RECEPTION.GENRAL is true, HS-DSCH reception is ongoing. 49. The method as in embodiment 48 wherein the WTRU clearS HSDPAresources and set HS_DSCH_RECEPTION_GENERAL to false if HS-DSCH theWTRU is not configured to support HS-DSCH reception. 50. The method as in embodiment 48 wherein variableHS_DSCH_RECEPTION_GENERAL is set to true whenHSJDSCH_RECEPTION variables are set to TRUE in CELL_FACH andCELL_DCH modes. 51. A method as in any one of embodiments 34-50 wherein the WTRUchecks if HSPDA is supported when the WTRU is acquiring system informationfor new cell setup. 52. The method as in embodiment 51 wherein the WTRU performssecondary common physical channel selection when the WTRU is not configuredto support HD-DSCH. 53. A method is in any one of embodiments 34-52 wherein the WTRUreads a HS_DSCH„RECEPTION_FOR_PAGING variable when the WTRU isconfigured in CELL_PCH mode or URA_PCH mode to determine HS-DSCHreception. 54. The method as in embodiment 53 wherein the WTRU evaluates andperforms actions associated with the HS-DSCH variable corresponding to a statethat the WTRU is entering. 55. A method as in embodiments 53 or 54 wherein the WTRU evaluatesvariables when HS-DSCH reception criteria is fulfilled or not fulfilled. 56. A method as in embodiment 53, 54 or 55 wherein the WTRU clearsHSDPA resources when requirements to enable HS-DSCH reception in a finalstate are not met. 57. A method as in any one of embodiments 53-56 wherein the WTRUreads four variables to determine HS-DSCH reception and wherein the fourvariables are: HS„DSCH_RECEPTION_CELL_FACH_STATE_ENABLED; HS_DSCH_RECEPTION; HS_DSCH_RECEPTION_OF_CCCH_ENABLED; andHS_DSCH_RECEPTION_PCH_STATE. 58. The method as in embodiment 57 wherein the WTRU reads the fourvariables when an IE "HS-DSCH paging system information" does not appear ina system information block type 5 or 5bis. 59. A method as in any one of embodiments 53-58 wherein the WTRUdoes not read HS_DSCH_RECEPTION when moving out of CELL_DCH state. 60. A method as in any one of embodiments 53-59 wherein the WTRUclears any stored IE "Downlink HS-PDSCH Information" if an IE related to HS-DSCH is stored in the WTRU. 61. A method as in any one of embodiments 53-60 wherein the WTRUsets HS-DSCH reception variables to "FALSE" when moving out of a state. 62. A method as in any one of embodiments 34-61 wherein the WTRUstops HS-DSCH procedures when transitioning between cells and states. 63. The method as in embodiment 29 wherein the WTRU reads aHS_DSCH_RECEPTION variable to determine HS-DSCH reception in otherstates. 64. A method as in embodiment 62 or 63 wherein the WTRU reads an"HS-DSCH common system information" IE parameter and a "HS-DSCH pagingsystem information" parameter to determine HS-DSCH reception. 65. A method as in any one of embodiments 62-64 wherein WTRU thereads a "HSJDSCH„RECEPTION_PCH_STATE" parameter to determine HS-DSCH reception. 66. A method as in any one of embodiments 34-65 wherein the WTRUreads a MAC state indicator to determine HS-DSCH reception.

[0098] Although features and elements are described above in particularcombinations, each feature or element can be used alone without the otherfeatures and elements or in various combinations with or without other featuresand elements. The methods or flow charts provided herein may be implementedin a computer program, software, or firmware incorporated in a computer-readable storage medium for execution by a general purpose computer or aprocessor. Examples of computer-readable storage mediums include a read onlymemory (ROM), a random access memory (RAM), a register, cache memory,semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROMdisks, and digital versatile disks (DVDs).

[0099] Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signalprocessor (DSP), a plurality of microprocessors, one or more microprocessors inassociation with a DSP core, a controller, a microcontroller, Application SpecificIntegrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits,any other type of integrated circuit (IC), and/or a state machine.

[00100] A processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU),user equipment (UE), terminal, base station, radio network controller (RNC), orany host computer. The WTRU may be used in conjunction with modules,implemented in hardware and/or software, such as a camera, a video cameramodule, a videophone, a speakerphone, a vibration device, a speaker, amicrophone, a television transceiver, a hands free headset, a keyboard, aBluetooth® module, a frequency modulated (FM) radio unit, a liquid crystaldisplay (LCD) display unit, an organic light-emitting diode (OLED) display unit,a digital music player, a media player, a video game player module, an Internetbrowser, and/or any wireless local area network (WLAN) or Ultra Wide Band(UWB) module. * * * □’Ewan , crnxan rwzn ατα ima^n pnow pnszn irn ητ -|aoa,Ρ’ηη vxan laoana mavia n^maa np’ioz .zrtwan rwas rnp’nn rnri αχηΓΐη . Gtoca uer □ιηπη Ρν J«w\ _ _

♦ ,.~. Q2 Ua/2)12 12fli:i9«KDID .(mcna navin) craswan nwa

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