HK1165127B - Method and apparatus for performing physical dedicated channel establishment and monitoring procedures - Google Patents

Description

Method and apparatus for performing physical dedicated channel setup and monitoring procedure

Cross Reference to Related Applications

This application claims benefit of U.S. provisional application No. 61/148,789 filed on 30/1/2009, which is incorporated herein by reference as if fully set forth.

Technical Field

The present application relates to wireless communications.

Background

Wireless communication systems continue to evolve in order to meet the demand for providing continuous and fast access to data networks. To meet these demands, wireless communication systems may utilize multiple carriers for data transmission. A wireless communication system that performs data transmission using multiple carriers is called a multi-carrier system. The use of multiple carriers extends both cellular and non-cellular wireless systems.

Multi-carrier systems may increase the available bandwidth in a wireless communication system depending on how many multiples of the available carriers. For example, a dual carrier system may double the bandwidth compared to a single carrier system, while a tri-carrier system may triple the bandwidth compared to a single carrier system. In addition to such throughput gains, it may also be desirable to obtain diversity and joint scheduling gains. This will result in an improvement in the quality of service (QoS) of the end user. Furthermore, the use of multiple carriers may be used in conjunction with Multiple Input Multiple Output (MIMO).

As an example, in the case of the third generation partnership project (3GPP) system, a new feature called dual cell high speed downlink packet access (DC-HSDPA) was introduced in release 8(R8) of the 3GPP specifications. With DC-HSDPA, a base station communicates with a wireless transmit/receive unit (WTRU) on two downlink carriers simultaneously. In addition to doubling the bandwidth and making peak data rates available to the WTRU, there is the potential to increase network efficiency through fast scheduling and fast channel feedback on both carriers.

For DC-HSDPA operation, each WTRU is allocated two downlink carriers: anchor carrier and supplementary carrier. The anchor carrier carries all physical layer dedicated and shared control channels associated with the transport channels, such as high speed downlink shared channel (HS-DSCH), enhanced dedicated channel (E-DCH), and Dedicated Channel (DCH) operations. Such physical layer channels include, for example, a fractional dedicated physical channel (F-DPCH), an E-DCH hybrid automatic repeat request (HARQ) indicator channel (E-HICH), an E-DCH relative grant channel (E-RGCH), an E-DCH absolute grant channel (E-AGCH), a common pilot channel (CPICH), a high speed shared control channel (HS-SCCH), and a high speed physical downlink shared channel (HS-PDSCH). The secondary carrier may carry the CPICH, HS-SCCH, and HS-PDSCH for the WTRU. In the present system, the uplink transmission is reserved (remaining on) one single carrier. High speed dedicated physical control channel (HS-DPCCH) feedback information is provided to the node-B on the uplink carrier and contains information for each downlink carrier.

It has been proposed to extend this feature to non-adjacent Downlink (DL) carriers (e.g., carriers in different frequency bands). It has also been proposed to extend the dual cell concept to the uplink. Thus, a WTRU may transmit on two carriers and receive on two carriers.

In Wideband Code Division Multiple Access (WCDMA) and HSPA, a WTRU monitors link quality by estimating DL Dedicated Physical Control Channel (DPCCH) or F-DPCH quality and, if configured, by monitoring Cyclic Redundancy Check (CRC) on a Dedicated Physical Data Channel (DPDCH). The physical layer reports a keep-in-sync and out-of-sync indication to a Radio Resource Control (RRC) layer in the WTRU, according to certain criteria. The RRC layer processes the keep-in-sync and out-of-sync indications and may determine that a radio link failure has occurred. More specifically, if the RRC in the WTRU receives a predefined number of out-of-sync indications (e.g., N313), the WTRU starts a predetermined timer (T315). If the WTRU does not receive a predefined number of keep-in-sync indications (e.g., N315) before the predetermined timer expires, a radio link failure is declared.

When dual-cell (or multi-cell) operation is implemented with carriers in different frequency bands, there is an important possibility that the link quality between the two frequency bands is significantly different. For example, if the WTRU is moving indoors, the indoor penetration characteristic is better in one of the two bands, and it is likely that the radio link will remain in one of the two bands. When this occurs, it is unclear how the WTRU should operate in order to reduce the disruption of the connection to the network. There is currently no mechanism to handle radio link failure in multi-carrier scenarios.

There is therefore a need for an improved method for radio link setup and monitoring.

Disclosure of Invention

A method and apparatus for performing dual carrier operation is described. A first timer is started for the anchor carrier and a second timer is started for the supplementary carrier. A physical channel failure is declared as long as any of the timers expires before a predefined number of keep-alives received from a layer 1(L1) entity are counted. Uplink transmissions and E-DCH operations on the secondary carrier associated with the physical channel failure are stopped but may continue on the anchor carrier where the physical channel was established. If the physical channel failure is associated with the anchor carrier, uplink transmissions and E-DCH operations on all carriers are stopped.

Drawings

The invention may be understood in more detail from the following description, given by way of example, with reference to the accompanying drawings, in which:

fig. 1A illustrates an example of a wireless communication system in which uplink transmissions are processed using a single carrier and downlink transmissions are processed using multiple carriers;

fig. 1B illustrates an example of a wireless communication system in which uplink transmissions are processed using multiple carriers and downlink transmissions are processed using multiple carriers;

figure 1C illustrates an example of a functional block diagram of a WTRU and a node-B in the wireless communication system of figure 1B;

figure 1D shows additional details of a processor in the WTRU of figure 1C;

fig. 2, 3, 4A and 4B are flow diagrams of a process of initiating dual carrier operation and monitoring carriers.

Detailed Description

The term "wireless transmit/receive unit (WTRU)" as referred to below includes, but is not limited to, a User Equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a Personal Digital Assistant (PDA), a computer, or any other type of device capable of operating in a wireless environment.

The term "base station" as referred to below includes, but is not limited to, a node-B, a site controller, an Access Point (AP), or any other type of interfacing device capable of operating in a wireless environment.

The network may allocate at least one downlink and/or at least one uplink carrier as an anchor downlink carrier and an anchor uplink carrier, respectively. In multi-carrier operation, a WTRU may be configured to operate with two or more carriers or may also be referred to as frequencies or cells. Each of these carriers may have different characteristics and logical relationships to the network and the WTRU, and the operating frequencies may be grouped and referred to as anchor or primary carriers and secondary or secondary carriers. Hereinafter, the terms "anchor carrier" and "primary carrier", and "secondary carrier", respectively, will be used interchangeably. If more than two carriers are configured, the WTRU may include more than one primary carrier and/or more than one secondary carrier. The embodiments described herein are applicable and can also be extended to these scenarios. For example, an anchor carrier may be defined as a carrier that carries a specific set of control information for downlink/uplink transmissions. Any carrier not designated as an anchor carrier may be a secondary carrier. Alternatively, the network may not specify the anchor carrier and no priority, preference, or default status may be specified for any downlink or uplink carrier. Hereinafter, the terms "anchor carrier", "primary carrier", "uplink carrier 1", "first carrier", and "first uplink carrier" will be used interchangeably herein for convenience. Similarly, the terms "secondary carrier," "uplink carrier 2," "second carrier," and "second uplink carrier" will also be used interchangeably herein. For multi-carrier operation, there is more than one secondary or sub-carrier.

Fig. 1A shows an example of a wireless communication system 10 in which uplink transmissions are processed using a single carrier 15 and downlink transmissions are processed using multiple carriers 20. The wireless communication system 10 includes a plurality of WTRUs 25, node-bs 30, a Controlling Radio Network Controller (CRNC)35, a Serving Radio Network Controller (SRNC)40, and a core network 45. The node-B30 and the CRNC 35 may be collectively referred to as UTRAN.

As shown in fig. 1A, the WTRU 25 communicates with the node-B30, and the node-B30 communicates with the CRNC 35 and the SRNC 40. Although 3 WTRUs 25, a node-B30, a CRNC 35, and an SRNC 40 are shown in fig. 1A, it should be noted that any combination of wireless and wireline devices may be included in the wireless communication system 10.

Fig. 1B shows an example of a wireless communication system 50 in which uplink transmissions are processed using multi-carrier 55 and downlink transmissions are processed using multi-carrier 60. The wireless communication system 50 includes a plurality of WTRUs 100, node-bs 150, CRNCs 155, SRNCs 160, and a core network 165. The node-B150 and the CRNC 155 may be collectively referred to as a UTRAN.

As shown in fig. 1B, the WTRU100 communicates with a node-B150, and the node-B150 communicates with a CRNC 155 and an SRNC 160. Although 3 WTRUs 100, a node-B150, a CRNC 155, and an SRNC 160 are shown in fig. 1A, it should be noted that any combination of wireless and wireline devices may be included in the wireless communication system 50.

Figure 1C is a functional block diagram of a WTRU100 and a node-B150 in the wireless communication system 50 of figure 1B. As shown in fig. 1C, the WTRUs 100 are in communication with the node-B150 and are each configured to perform a method in which uplink transmissions from the WTRUs 100 are transmitted to the node-B150 using multiple uplink carriers 65 and downlink transmissions are processed using multiple carriers 70. The WTRU100 includes an antenna 105, a receiver 110, a transmitter 115, a processor 120, a memory 122, and other components (not shown) that may be found in a typical WTRU. The antenna 105 may include multiple antenna elements, or multiple antennas may be included in the WTRU 100. Memory 122 is provided for storing software including an operating system and application programs. The processor 120 is provided to perform a method for uplink transmission using multiple uplink carriers, alone or in combination with software and/or any one or more components. The receiver 110 and the transmitter 115 are in communication with the processor 120. The receiver 110 and the transmitter 115 are capable of receiving and transmitting one or more carriers simultaneously. Alternatively, multiple receivers and/or multiple transmitters may be included in the WTRU 100. The antenna 105 is in communication with a receiver 110 and a transmitter 115 to facilitate the transmission and reception of wireless data.

node-B150 includes an antenna 155, a receiver 160, a transmitter 165, a processor 170, a memory 172, and other components (not shown) that may be found in a typical base station. The antenna 155 may include multiple antenna elements, or multiple antennas may be included in the node-B150. Memory 172 is provided for storing software including an operating system and application programs. The processor 170 is provided to perform, alone or in combination with software and/or any one or more components, a method in which uplink transmissions from the WTRU100 are transmitted to the node-B150 using multiple uplink carriers in accordance with the embodiments described below. The receiver 160 and the transmitter 165 are in communication with the processor 170. Receiver 160 and transmitter 165 can simultaneously receive and transmit one or more carriers. Alternatively, multiple receivers and/or multiple transmitters may be included in node-B150. The antenna 155 is in communication with a receiver 160 and a transmitter 165 to facilitate the transmission and reception of wireless data.

FIG. 1D shows the WTRU100For additional details of the processor 120. As shown in FIG. 1D, the processor 120 may include a plurality of predetermined timers 125₁、125₂、...、125_NAnd a plurality of counters 130₁、130₂、130₃、130₄、...、130_N。

In one aspect, dual carrier (i.e., dual cell) or multi-carrier (i.e., multi-cell) operation is performed on the Uplink (UL) and DL using multiple parallel power control loops. Each DL carrier is associated with one UL carrier, and the physical channel (e.g., F-DPCH) of that DL carrier is associated with the control channel (e.g., DPCCH) of the corresponding UL carrier.

In another aspect, dual-carrier or multi-carrier operation is performed on the DL using at least one DL carrier that is not associated with an UL carrier for power control purposes. Thus, the physical channel (e.g., F-DPCH) is not transmitted over the DL carrier.

Radio link establishment procedure

If the RRC configuration message leaves the WTRU100 in CELL _ DCH, (where dedicated channels are established and maintained to facilitate dedicated communications), and provides the WTRU100 with a new physical channel configuration for dual carrier operation, the WTRU100 may initiate a physical dedicated channel establishment procedure. The WTRU100 may perform two physical dedicated channel establishment procedures. Thus, one such process is performed for each carrier individually.

According to one approach, the counters 130 are maintained separately for each carrier (i.e., anchor carrier and supplementary carrier). A separate timer 125 (e.g., T312) is started for each carrier when the corresponding physical channel setup procedure is initiated for the corresponding carrier. At least one counter 130 in the WTRU100 determines whether a predefined number of received keep-alive indications from layer 1 has been reached (e.g., N312) to determine whether a physical dedicated channel is established. If the timer 125 (e.g., T312) for a particular carrier expires before physical dedicated channel establishment, the WTRU100 considers this to be a physical dedicated channel establishment failure for the particular carrier. Once one or both carriers fail in the procedure, the WTRU100 may declare a complete "physical channel failure". Alternatively, if the procedure fails on the anchor carrier, the WTRU100 may consider "physical channel failure" even if the supplementary carrier successfully completes the physical dedicated channel setup.

Fig. 2 is a flow diagram of a method 200 of initiating dual carrier operation and monitoring carriers. The WTRU100 initiates dual carrier operation (205). The WTRU may initiate dual carrier operation after one or more explicit indications by the network (e.g., using RRC signaling or HS-SCCH activation orders). Starting a first timer 125 in WTRU100 for an anchor carrier₁(e.g., T312) (210), (e.g., optionally at a specified or predetermined activation time when an explicit indication of the network is received). Starting a second timer 125 in the WTRU100 for a supplementary carrier₂(e.g., T312) (215), (e.g., optionally at a specified or predetermined activation time when an explicit indication of the network is received). First counter 130 in WTRU100₁For maintaining a number of synchronization indications (220) for anchor carrier monitoring. Second counter 130 in WTRU100₂For maintaining a number of synchronization indications (225) for secondary carrier monitoring. It is then determined that the first timer 125 is reached before a predefined number of keep-alives (e.g., N312) is reached₁Or a second timer 125₂Whether expired, keep in sync indicating a predefined number by the first and second counters 130₁、130₂Is determined (230). The predefined number of keep-alive indications may be the same or different for each carrier. If the predefined number of keep-in-sync indications is not reached, a physical channel failure is declared/reported (235), and the WTRU100 stops uplink transmission on the carrier associated with the physical channel failure and continues uplink transmission on the carrier for which the physical channel was established (240). And if the predefined number of keep-synchronization indications is reached, the downlink physical dedicated channel is considered to be established.

In an alternative physical channel establishment method, upon initiating a dual carrier physical channel establishment procedure upon receiving one or more explicit indications from the network, the WTRU100 may start a timer 125 (e.g., T312) and wait for a predefined number of keep-alive indications from any carrier (e.g., N312). If either of the two carriers meets the criteria, the WTRU100 stops the timer 125 and resets it. The physical dedicated channel is then considered to be established on both carriers. The timer 125 may be stopped and reset if the counter 130 in the WTRU100 determines that the anchor carrier receives a predefined number of keep-alive indications from layer 1 (e.g., N312) and that the physical dedicated channel is considered established.

Fig. 3 is a flow diagram of a method 300 of initiating dual carrier operation and monitoring carriers. The WTRU100 initiates dual carrier operation (305). Starting a first timer 125 in WTRU100 for an anchor carrier₁(e.g., T312) (310). Starting a second timer 125 in the WTRU100 for a supplementary carrier₂(e.g., T312) (315). First counter 130 in WTRU100₁For maintaining a number of synchronization indications for anchor carrier monitoring (320). Second counter 130 in WTRU100₂For maintaining a number of synchronization indications for secondary carrier monitoring (325). Then, it is determined at the first timer 125₁And a second timer 125₂Whether or not the respective first counter 130 is reached before expiry₁Or a second counter 130₂The calculated stay synchronized indicates a predefined number (e.g., N312) (330). If the predefined number of keep-alives is reached, the first timer 125₁And a second timer 125₂Is stopped and reset (335). If the predefined number of keep-synchronization indications is not reached, a physical channel failure is declared/reported (340), and the WTRU100 stops uplink transmission on the carrier associated with the physical channel failure and continues uplink transmission on the carrier on which the physical channel was established (345).

In Universal Mobile Telecommunications System (UMTS), the network may configure the WTRU100 to use "post-verification" to speed up physical channel setup. At a higher layer, when a post-verification is configured for initiating a physical channel setup procedure in legacy single carrier operation, the WTRU100 quickly initiates uplink transmission and verifies the quality of the downlink channel (DPCCH or F-DPCH) after a certain period of time (e.g., 40 ms). If the reported quality is below the threshold, the WTRU100 stops the uplink transmission and continues the synchronization procedure normally. The WTRU100 then waits for the establishment of a downlink channel to continue with uplink transmission.

In dual carrier operation, post verification may be configured independently for both carriers. Thus, when the WTRU100 initiates a physical dedicated channel setup on either of the two carriers, the WTRU100 may start transmitting on both uplink carriers. Alternatively, post-verification may be allowed to occur on the anchor carrier, in which case transmission on the uplink is initiated on the anchor carrier if post-verification is configured. The WTRU100 may initiate uplink transmission on the supplementary carrier if the physical dedicated channel establishment criteria is deemed successful on the supplementary carrier or both carriers. Otherwise, the WTRU100 turns off its transmitter 115 and considers the post-verification to fail. The WTRU100 does not transmit on the UL and waits for higher layer commands (e.g., an indication that the downlink physical dedicated channel is established) before continuing uplink transmission.

Upon detecting a physical dedicated channel setup failure on one carrier while other carriers are deemed to have an established physical dedicated channel, the WTRU100 may stop UL transmission on the failed carrier, turn off its transmitter 115, and consider a post-verification failure on that carrier (if applicable).

The WTRU100 may also continue to transmit/receive on the carriers of the established physical dedicated channel or send an RRC message indicating that the network failed to establish the physical dedicated channel on one of the carriers. The WTRU100 may report a successful reconfiguration procedure (i.e., RRC reconfiguration complete message). However, the RRC message may be extended to indicate that a failure occurred on one of the carriers, or that a failure occurred on the anchor carrier. Alternatively, a new RRC message may be defined to indicate failure.

The WTRU100 may send a measurement report to indicate such failure or respond with an RRC reconfiguration failure message. However, the failure message may be extended to report one carrier failure (i.e., a secondary carrier failure, or an anchor carrier failure, or both). The "failure cause" may be extended to secondary physical channel failures, anchor physical channel failures, or simply total physical channel failures. The WTRU100 may report a particular value of a Channel Quality Indicator (CQI) to indicate a channel failure to the network or refrain from reporting the CQI (i.e., the CQI is Discontinuous Transmission (DTX)). Alternatively, layer 2(L2) messages may be employed. Once the failure is reported to the network, the WTRU100 may continue single carrier operation on the successful carrier. The WTRU100 may also stop any reception/transmission procedures on the secondary carrier or wait for an explicit indication from the network once the procedure fails.

As currently illustrated, for single carrier operation, the WTRU100 may revert to its previous configuration upon physical channel failure. However, for dual carrier operation, the WTRU100 may continue single carrier operation on the successful carrier even if physical dedicated channel setup for one carrier fails. More specifically, if the physical channel setup of the anchor carrier is successful and the physical channel setup of the secondary carrier is failed, the WTRU may continue operating on the anchor carrier. Similarly, if the physical channel setup of the secondary carrier is successful and the physical channel setup of the anchor carrier is failed, the WTRU may continue operating on the secondary carrier.

When physical dedicated channel setup fails for both anchor and supplementary carriers, the WTRU100 may declare a physical channel failure and report the failure on an RRC failure message. Accordingly, the WTRU100 may then revert to the old configuration.

Alternatively, the WTRU100 may declare physical channel failure even if one of the carriers fails. In this scenario, the WTRU100 may operate similar to the case where the physical dedicated channel setup of both carriers fails.

Radio link monitoring with multiple power control loops

In the case of multiple parallel power control loops, (i.e., more than one pair of F-DPCH and DPCCH channels exchanging Transmit Power Control (TPC) commands), the WTRU100 may monitor the quality of the DL F-DPCH on each cell independently. Thus, the physical layer reports the keep-in-sync and out-of-sync indications to higher layers (e.g., RRC layer) independently for each carrier. The criteria for reporting the maintenance and loss of synchronization, however, remain consistent with single carrier operation. In a Long Term Evolution (LTE) system, there is no power control loop, but the WTRU100 may monitor the quality of each carrier independently from decoding the physical dedicated channel (PDCCH).

There are different possibilities for handling the indication of stay in sync and loss of sync at higher layers and for the actions taken by the WTRU 100.

In the WTRU100, a counter 130 configured to count out-of-sync and keep-in-sync indications and a timer 125 are maintained for each carrier. The WTRU100 may use a separate counter 130 and timer 125 for each carrier to determine whether there is a radio link failure on any carrier, respectively. Likewise, on a given carrier, a timer 125 (e.g., T313) is started when a predefined number of out-of-synchronization indications (e.g., N313) are received for that carrier, and a radio link failure is determined if the timer 125 expires before a predefined number of keep-in-synchronization indications (e.g., N315) are received. The value of the timer 125 and the number of indications of stay in and out of synchronization (e.g., N313, N315) may be the same for both carriers or may be different.

Fig. 4A and 4B together are a flow diagram of a method 400 of monitoring carriers during dual carrier operation. Using a first counter 130₁The number of out-of-synchronization indications is monitored for an anchor carrier (405). Using a second counter 130₂The number of out-of-sync indications is monitored for a secondary carrier (410). When the first counter 130 is reached for the anchor carrier₁Upon a determined first loss of synchronization indicating a predefined number (e.g., N313 for UMTS or N310 for LTE), the first timer 125 is started₁(e.g., T313 for UMTS or T31 for LTE0)(415). When reached by the second counter 130 for the auxiliary carrier₂When the determined second out-of-sync indicates a predefined number, a second timer 125 is started₂(e.g., T313 for UMTS or T310 for LTE) (420). Third counter 130 in WTRU100₃For maintaining a number of synchronization indications for anchor carrier monitoring (425). Fourth counter 130 in WTRU100₄For maintaining a number of synchronization indications for secondary carrier monitoring (430).

Then, it is determined at the first timer 125₁Before expiry by the third counter 130₃Whether the counted amount reaches a keep-sync indication predefined number (e.g., N315 for UMTS or N311 for LTE) for the anchor carrier (435). If the predefined number of keep-alive indications is not reached, a radio link failure is declared/reported (440), the WTRU100 stops uplink transmission and E-DCH transmission operations on all carriers (445), and a cell update procedure is initiated (450). In LTE systems, the WTRU100 performs an RRC connection re-establishment procedure or moves to an RRC _ IDLE state, depending on whether security capabilities are activated.

If the predefined number of keep-synchronization indications is reached, then a determination is made at the second timer 125₂Before expiry by the fourth counter 130₄Whether the counted amount for the secondary carrier reaches a keep-sync indication predefined number (e.g., N315 for UMTS or N311 for LTE) (455). If the predefined number of keep-alives is reached, the first timer 125₁And a second timer 125₂Is stopped and reset (460). If the predefined number of keep-synchronization indications is not reached, a radio link failure is declared/reported (465) and the WTRU100 stops uplink transmission and E-DCH transmission operations on the secondary carrier and continues uplink transmission and E-DCH transmission operations on the anchor carrier (470). In an LTE system, the WTRU100 stops PDCCH reception on the secondary carrier and continues PDCCH reception on the anchor carrier.

When a radio link failure occurs on one of the carriers, a correlation of the radio link status of the other carriers is introduced for one or more timer values and a predefined number of out-of-synchronization and keep-synchronization indications (e.g., N313, N315, and T313). Thus, if a radio link failure is first determined to be for one carrier, the WTRU100 may begin determining radio link failures for other carriers using different timers and/or indicator values. This speeds up the determination that there is a radio link failure on both carriers.

The use of a single counter 130 for out-of-sync and out-of-sync indications during the recovery phase and a single recovery timer 125 for both carriers is another possibility to handle the out-of-sync and in-sync indications at higher layers. The counter is affected (increased) by an indication of the stay in sync or loss of sync for each carrier, which results in a comprehensive determination that the radio link failure for both carriers is taken into account.

Alternatively, the WTRU100 maintains two different counters 130, but once one or both carriers have reported a predefined number of out-of-synchronization indications (e.g., N313), a counter (e.g., T313) is started. If at least one carrier reports a predefined number of keep-synchronization indications (e.g., N315), the WTRU100 may continue normal operation and no radio link failure is declared.

Alternatively, if the criteria for radio link failure are met on the anchor carrier, the WTRU100 may declare a higher layer radio link failure. The WTRU100 may still keep a count of out-of-sync indications from the supplementary carrier in order to manage downlink reception and transmission of data on that carrier. Thus, higher layers may declare a radio failure even if the criteria on the secondary carrier are not met. According to this criterion, the WTRU100 may declare a higher layer radio link failure if the radio link failure criterion is met on both carriers.

When it is determined that there is a radio link failure on any carrier, the WTRU100 may perform one or more operations including releasing all radio resources on the relevant carrier, stopping HS-DSCH reception and enhanced dedicated channel (E-DCH) transmission procedures on the relevant carrier (if applicable), including HS-DPCCH reporting. If the latter is performed, the WTRU100 may wait for a signal from the network to stop, (e.g., a high speed synchronous control channel (HS-SCCH) order on the anchor or supplementary carrier, an indication from a higher layer, an E-DCH absolute grant channel (E-AGCH) with a particular grant and/or grant range value). In an LTE system, the WTRU100 may stop PDCCH and PDSCH reception on the relevant carriers.

The WTRU100 may flush and clear the E-DCH and HS-DSCH HARQ entities for the relevant carriers (if these entities are associated with a particular carrier) or initiate transmission of a measurement report (if the radio link failure for at least one carrier is not determined), including carrier information for which at least one or a set of radio link failures has been determined. Such information may include: the CPICH energy (Ec)/interference power density (No) or CPICH Received Signal Code Power (RSCP), DPCCH transmission power, and/or WTRU power headroom (headroom) for each carrier, each chip, for which the radio link failed is determined.

In UMTS or LTE systems, inter-frequency measurements are triggered when the serving frequency quality is below a predetermined threshold. The network may send control signaling if the network determines that inter-frequency measurements need to be performed. Events will also be signaled along with the measurements.

New events may be defined for the transmission of measurement reports in order to explicitly report radio link failures on a particular carrier. Alternatively, the existing events may be extended to include the case where the existing events may be triggered using the current system's criteria or other radio link failure criteria for that carrier.

Alternatively, the inter-frequency event may be extended to report a failure or the quality of the secondary carrier falls below a threshold while the quality of the other cells is still good and, optionally, is still the best cell on the designated frequency. The WTRU100 may transmit the measurement report using one of the existing RRC protocol mechanisms (i.e., the "measurement report" RRC message or the "measurement report" Information Element (IE)) or a new RRC message specifically defined for this purpose.

The transmission of scheduling information may be triggered, including Uplink Power Headroom (UPH) measurements related to the remaining carriers. Alternatively, the UPH field carries a specific value (e.g., 0).

Transmission of an indication of radio link failure on the relevant carrier at layer 2 (e.g., Medium Access Control (MAC) or radio link control (RRC)) is also triggered. For example, a specific field of the MAC header is defined and indicated by using one of a specific logical channel Identification (ID), using an available idle value of the MAC-I header, or an idle bit immediately following the logical channel identification value 1111. The field may also indicate which carrier or set of carriers has failed.

For the relevant carrier, a CQI report may be triggered to be transmitted to the network along with a specific value indicating a radio link failure.

Determination of radio link failure through the associated carrier and cessation of radio link monitoring on the associated carrier by the WTRU 100.

Alternatively, the stop reception/transmission procedure on the relevant carrier may be performed by the WTRU100 upon receiving an explicit indication from the network.

The WTRU100 may alternatively release all radio resources on all carriers even if a radio link failure occurs on only one carrier.

The HS-DSCH reception and E-DCH transmission procedures on all carriers may also be stopped when a radio link failure is detected.

The E-DCH and HS-DSCH HSRQ entities for all carriers are cleared.

Due to radio link failure, the WTRU100 typically initiates a cell update procedure and indicates in a cell update message which carrier's radio link failure is determined. The WTRU100 may then move to a forward access channel Cell (Cell _ FACH) where the dedicated channel is deactivated and communication is performed on the common channel.

Operations to be performed upon determining radio link failure of a carrier

Operations may be performed by the WTRU100 when a radio link failure is determined on an anchor carrier (if the associated carrier is an anchor carrier) or on a supplementary carrier (if the associated carrier is an anchor carrier) as described below.

When a radio link failure is determined for both carriers, or if the remaining carriers for radio link monitoring are also determined to be in radio link failure, or if a radio link failure is determined on the anchor carrier (even if no radio link failure is determined on the supplementary carrier), the WTRU100 may release all radio resources on all carriers (or the remaining carriers) and/or stop HS-DSCH reception and E-DCH transmission procedures on all carriers (if applicable). In the latter case, the WTRU100 may wait for signaling from the network to perform the operation (e.g., HS-SCCH orders on the anchor or supplementary carrier or indications from higher layers).

The WTRU100 may also flush and clear the E-DCH and HS-DSCH HARQ entities for all carriers or initiate a cell update procedure due to radio link failure. The WTRU100 may indicate in the cell update message which carrier's radio link failure was determined, possibly listing all carriers it employs, or alternatively a particular value may indicate that all carriers' radio link failures were determined. The WTRU100 may then move to Cell _ FACH or another state.

When the WTRU100 determines that the radio link on the secondary carrier failed (i.e., the secondary radio link failed), the WTRU100 may suspend the E-DCH transmission/reception procedure on the secondary carrier and optionally suspend the HS-DSCH reception. That is, the WTRU100 may stop transmitting on the secondary uplink frequency and thus stop E-DCH operation (transmission and reception) on that carrier. Optionally, the WTRU100 may also suspend HS-DSCH reception on the secondary serving HS-DSCH cell. Rather than clearing all relevant resources, the WTRU100 may retain configuration information for the F-DPCH, E-DCH, and HS-DSCH. The WTRU100 may continue to monitor the F-DPCH of the secondary carrier in hopes of re-establishing synchronization, optionally for a specified period of time. The WTRU100 may continue uplink operation later when indicated by the network through explicit signaling (e.g., through RRC messages or HS-SCCH orders).

To determine synchronization re-establishment, the WTRU100 initiates a new synchronization procedure, or re-initiates the synchronization procedure a (optionally without post-verification). In one approach, the WTRU100 may initiate the new procedure after a specified period of time following a radio link failure. That is, upon radio link failure, the WTRU100 starts a timer. When the new timer expires, the WTRU100 initiates the new synchronization procedure. If the WTRU100 uses synchronization procedure a, the parameters for synchronization establishment will be scanned (scale) after the secondary radio link failure. The parameters of the new synchronization process and/or the parameters of the scanning may be hard coded or included as part of the system information.

When the WTRU100 determines that the radio link failure is on the anchor carrier, the WTRU100 may request the supplementary carrier to become the anchor carrier. This is very relevant in case the anchor carrier carries some control information for both carriers and/or the WTRU100 sends some control information on the anchor carrier (for both carriers). Upon detecting a radio link failure, the WTRU100 may perform power control on the supplementary carrier and continue E-DCH and optionally HS-DSCH transmission/reception on that carrier, providing that all control channels move onto that carrier.

The WTRU100 may then cease transmission and reception on the anchor carrier and send an indication to the network to cause the supplementary carrier to become the anchor carrier. This may be done through measurement reports transmitted on the secondary carrier (as described above) or through some layer 1 or layer 2 mechanism. The network may then use these as requests to cause the secondary carrier to be upgraded. The network may then provide the WTRU100 with the necessary configuration information to establish the missing uplink and downlink control channels on the supplementary carriers.

After a radio link failure and before the WTRU100 receives new control channel information, the WTRU100 needs to operate in "transition" mode with a reduced set of E-DCH and HS-DSCH control information. The WTRU100 may be configured to operate in this mode for a limited time (pre-configured or signaled in system information). If no new control configuration information is received within a defined time, the WTRU100 may declare a radio link failure and proceed as described above.

Alternatively, the WTRU100 may request that the supplementary carrier be exchanged with the anchor carrier. If the network accepts the request, upon receiving configuration information for the new anchor carrier, the WTRU100 continues to monitor the quality of the new supplementary carrier (the original anchor carrier suffered a radio link failure) in order to attempt to re-establish synchronization with that carrier. As described above, the WTRU100 may use a new synchronization procedure or a modified synchronization procedure a.

When the network determines, autonomously or by an explicit indication from the WTRU100, that a radio link on a carrier or a group of carriers fails, the network will stop scheduling for the WTRU100 on the relevant carrier, disable the relevant carrier (e.g., deactivate the carrier by sending an HS-SCCH order or an RRC message), or configure the WTRU100 in the same node-B at another frequency.

Single power control loop

When there is a single power control loop (i.e., a pair of F-DPCH and DPCCH channels exchange Transmit Power Control (TPC) commands), the WTRU100 may monitor the quality of the (downlink) F-DPCH channel on the anchor cell. However, this provides radio link monitoring of the anchor cell. The WTRU100 may determine that the quality of the radio link on one of the secondary carriers is poor using one or a combination of the following criteria: CPICH RSCP of the measurements on the relevant carrier remaining below the threshold for a determined period of time; the CPICH Ec/No measured on the relevant carrier is kept below a threshold for a certain period of time, the number of receptions of failed high speed physical downlink shared channel (HS-PDSCH) Protocol Data Units (PDUs) becomes higher than the threshold, the ratio of the reception of failed HS-PDSCH PDUs to the reception of the total HS-pdschhpdu (HARQ block error rate (BLER)) or the average value of its variation over a certain period of time becomes higher than the threshold, and the CQI value falls below the threshold for a certain period of time or equals zero for a certain period of time.

When one or a combination of the above criteria are met, the physical layer indicates to higher layers that synchronization is lost (or equivalently an indication). Alternatively, the WTRU100 may directly determine the radio link failure of the associated secondary carrier without utilizing the keep-in-sync/out-of-sync mechanism.

The WTRU100 may determine that the quality of the radio link on one of the secondary carriers is good based on one or a combination of the following criteria: CPICH RSCP measured on the relevant carrier remains above the threshold for a certain period of time, CPICH Ec/No measured on the relevant carrier remains above the threshold for a certain period of time, the number of receptions of failed HS-PDSCH PDUs becomes below the threshold, or the ratio of the reception of failed HS-PDSCH PDUs to the reception of total HS-PDSCH PDUs (HARQBLER) or the average of its variation over a certain period of time becomes below the threshold.

When one or a combination of the above criteria is met, the physical layer indicates to the higher layers that the relevant carriers remain synchronized (or equivalently an indication). The WTRU100 may also send an RRC message to indicate that the quality of the associated carrier is above a threshold and may begin reception. Such behavior may be achieved through extensions of existing measurement events. Alternatively, a new measurement event may be defined to allow the WTRU100 to report to the network that the secondary carrier CPICH measurement becomes above a threshold for a predetermined period of time, optionally with the anchor CPICH quality still listing the cell as the best cell in the designated carrier.

Operations to be performed when it is determined that a radio link failed or a single power control loop lost synchronization

When the WTRU100 determines that the wireless quality of the supplementary carrier (i.e., the carrier for which no power control loop is active) is poor, the WTRU100 may report a CQI specific value (e.g., 0 or 31) for the relevant carrier or an RRC message may be sent to the network to inform the network that the quality of the supplementary carrier is below a threshold. The notification to the network may be accomplished by using a measurement report message. Existing events may be utilized and extended to indicate that the quality of the secondary cell has fallen below a threshold. Alternatively, the event may be extended to inform the network that the quality of the secondary carrier has fallen below a threshold while the other frequencies are still in their best cell. Another alternative is to define a new event type. These events may be extended to also allow the WTRU100 to send the RSCP or Ec/No values for the supplementary carrier and the anchor carrier, which are triggered when the anchor carrier remains in the best cell and the supplementary carrier CPICH measurement falls below a threshold.

The WTRU100 may also utilize layer 2 signaling (e.g., as indicated above) to indicate that the quality of the secondary cell is below a threshold.

Once poor quality is detected on the supplementary carrier, the WTRU100 may stop the reporting of CQI associated with the relevant carrier (i.e., DTX HS-DPCCH field best suited), and/or stop the reception process related to the relevant carrier.

Alternatively, the reception process is interrupted when an explicit indication is received from the network, e.g. by an RRC message, an HS-SCCH order or a layer 2 message.

In addition, the WTRU100 may also perform the related operations disclosed above that take into account the operation of the WTRU100 when determining a radio link failure for a carrier.

The disclosed operation for a single power control loop is also applicable to operation of a dual power control loop.

Examples

1. A method implemented by a wireless transmit/receive unit (WTRU) for performing dual carrier operation, the method comprising:

monitoring for maintaining a synchronization indication for an anchor carrier and a secondary carrier; and

declaring a physical channel failure if a predefined amount of time elapses without the counted number reaching the keep-synchronization-indication predefined number.

2. The method of embodiment 1, further comprising:

starting a first timer for an anchor carrier;

starting a second timer for the secondary carrier;

monitoring for a keep-in-sync indication for the anchor carrier using a first counter;

maintaining a synchronization indication for the secondary carrier monitoring using a second counter; and

declaring a physical channel failure if either of the first timer or the second timer expires before an amount counted by one of the counters reaches a keep-synchronization indication predefined amount.

3. The method as in any of embodiments 1-2 wherein the WTRU stops uplink transmissions on a carrier associated with the physical channel failure and continues uplink transmissions on a carrier on which a physical channel is established.

4. The method as in any one of embodiments 1-3 wherein the keep-alive indications are received from a layer 1(L1) entity.

5. The method as in any one of embodiments 1-4 further comprising stopping uplink transmissions and enhanced dedicated channel (E-DCH) operations on the secondary carrier and continuing uplink transmissions and E-DCH transmission operations on the anchor carrier if the physical channel failure is declared on the secondary carrier.

6. The method as in any of embodiments 2-5 further comprising stopping and resetting the first and second timers before expiration if the amount counted by one of the counters reaches a predefined number of keep-synchronization indications.

7. A method implemented by a wireless transmit/receive unit (WTRU) for performing dual carrier operation, the method comprising:

monitoring for an out-of-synchronization indication for an anchor carrier using a first counter;

monitoring for an out-of-sync indication for a secondary carrier using a second counter;

starting a first timer if the loss of synchronization determined by the first counter for the anchor carrier indicates that a first predefined number is reached;

starting a second timer if the loss of synchronization determined by the second counter for the secondary carrier indicates that a second predefined number is reached;

monitoring for a hold synchronization indication for the anchor carrier using a third counter;

maintaining a synchronization indication for the secondary carrier monitoring using a fourth counter; and

stopping and resetting the first and second timers in the event that the amount counted by the third and fourth counters reaches a keep-sync indication predefined number.

8. The method of embodiment 7 wherein the keep-in-sync indication and the out-of-sync indication are received from a layer 1(L1) entity.

9. The method as in any one of embodiments 7-8, further comprising:

declaring a radio link failure on the anchor carrier if the first timer expires before the amount counted by the third counter reaches a predefined number of keep-in-sync indications;

stopping uplink transmission and enhanced dedicated channel (E-DCH) transmission operations on all carriers; and

a cell update procedure is initiated.

10. The method of embodiment 9, further comprising:

downlink reception and high speed downlink shared channel (HS-DSCH) operation on all carriers is stopped.

11. The method as in any one of embodiments 7-10, further comprising:

declaring a radio link failure on the secondary carrier if the second timer expires before the amount counted by the fourth counter reaches a predefined number of keep-in-sync indications; and

stopping uplink transmission and enhanced dedicated channel (E-DCH) transmission operations on the secondary carrier.

12. A wireless transmit/receive unit (WTRU) for performing dual carrier operation, the WTRU comprising:

a first timer;

a second timer;

a first counter configured to monitor for a keep-synchronized indication for an anchor carrier after the first timer is started; and

a second counter configured to monitor for a keep-in-sync indication for a secondary carrier after the second timer is started, wherein a physical channel failure is declared if either of the first or second timers expires before an amount counted by one of the counters reaches a predefined number of keep-in-sync indications.

13. The WTRU of embodiment 12 wherein the WTRU stops uplink transmission on the carrier associated with the physical channel failure and continues uplink transmission on the carrier on which the physical channel was established.

14. The WTRU as in any one of embodiments 12-13 wherein the indication to maintain synchronization is received from a layer 1(L1) entity.

15. The WTRU of embodiments 12-14 wherein on a condition that the physical channel failure is announced on the supplementary carrier, the WTRU stops uplink transmission and enhanced dedicated channel (E-DCH) operation on the supplementary carrier and continues uplink transmission and E-DCH transmission operation on the anchor carrier.

16. The WTRU as in any one of embodiments 12-15 wherein the first and second timers are stopped and reset prior to expiration on a condition that an amount counted by one of the counters reaches a predefined number of keep-alive indications.

17. A wireless transmit/receive unit (WTRU) for performing dual carrier operation, the WTRU comprising:

a first counter configured to monitor for an out-of-synchronization indication for an anchor carrier;

a second counter configured to monitor for an out-of-sync indication for a secondary carrier;

a first timer configured to start if the loss of synchronization determined by the first counter for the anchor carrier indicates that a first predetermined number is reached;

a second timer configured to start if the loss of synchronization determined by the second counter for the secondary carrier indicates that a second predetermined number is reached;

a third counter configured to maintain a synchronization indication for the anchor carrier monitoring;

a fourth counter configured to monitor for a keep-synchronization indication for the secondary carrier, wherein the first and second timers are stopped and reset if the amount counted by the third and fourth counters reaches a keep-synchronization indication predefined number.

18. The WTRU of embodiment 17 wherein the indication to maintain synchronization and the indication to lose synchronization are received from a layer 1(L1) entity.

19. The WTRU as in any one of embodiments 17-18 wherein before the amount counted by the third counter reaches a predefined number of keep-in-sync indications, if the first timer expires, a radio link failure on the anchor carrier is declared, uplink transmission and enhanced dedicated channel (E-DCH) transmission operations on all carriers are stopped, and a cell update procedure is initiated.

20. The WTRU as in any one of embodiments 17-19 wherein the WTRU stops downlink reception and high speed downlink shared channel (HS-DSCH) operation on all carriers.

21. The WTRU as in any one of embodiments 17-20 wherein before the amount counted by the fourth counter reaches a predefined number of keep-alive indications, if the second timer expires, a radio link failure on the secondary carrier is declared and uplink transmission and enhanced dedicated channel (E-DCH) transmission operations on the secondary carrier are stopped.

Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone without the other features and elements of the preferred embodiments or in various combinations with or without other features and elements of the present invention. The methods or flow charts provided in the present invention may be implemented in a computer program, software, or firmware tangibly embodied in a computer-readable storage medium for execution by a general purpose computer or a processor. Examples of the computer readable storage medium include Read Only Memory (ROM), Random Access Memory (RAM), registers, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM optical disks and Digital Versatile Disks (DVDs).

For example, suitable processors include: a general-purpose processor, a special-purpose processor, a conventional processor, a Digital Signal Processor (DSP), a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a controller, a microcontroller, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) circuit, any Integrated Circuit (IC), and/or a state machine.

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), or any host computer. The WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a video telephone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a microphone, a,A Frequency Modulation (FM) wireless unit, a Liquid Crystal Display (LCD) display unit, an Organic Light Emitting Diode (OLED) display unit, a digital music player, a media player, a video game player module, an internet browser, and/or any Wireless Local Area Network (WLAN) module or Ultra Wideband (UWB) module.

Claims (15)

1. A method implemented by a wireless transmit/receive unit (WTRU) for performing dual carrier operation, the method comprising:

starting a first timer for an anchor carrier;

starting a second timer for the secondary carrier;

monitoring for a keep-in-sync indication for the anchor carrier using a first counter;

maintaining a synchronization indication for the secondary carrier monitoring using a second counter;

declaring a physical channel setup failure on the anchor carrier if the first timer expires before the amount counted by the first counter reaches a predefined number of keep-in-sync indications;

declaring a physical channel setup failure on the secondary carrier if the second timer expires before the amount counted by the second counter reaches a predefined number of keep-in-sync indications;

ending uplink transmission on the secondary carrier if a physical channel setup failure is declared on the secondary carrier; and

ending a fractional dedicated physical channel (F-DPCH) reception procedure on the secondary carrier in case a physical channel setup failure is declared on the secondary carrier.

2. The method of claim 1, further comprising reverting to a previous configuration if a physical channel setup failure is declared on the anchor carrier.

3. The method of claim 1, wherein in the event that the physical channel setup failure is declared on the secondary carrier, ending uplink transmissions and enhanced dedicated channel (E-DCH) operations on the secondary carrier and continuing uplink transmissions and E-DCH operations on the anchor carrier.

4. The method of claim 1, further comprising stopping and resetting the first and second timers prior to expiration if an amount counted by one of the counters reaches a keep-sync indication predefined amount.

5. A method implemented by a wireless transmit/receive unit (WTRU) for performing dual carrier operation, the method comprising:

monitoring for an out-of-synchronization indication for an anchor carrier using a first counter;

monitoring for an out-of-sync indication for a secondary carrier using a second counter;

starting a first timer if a consecutive loss of synchronization determined by the first counter for the anchor carrier indicates that a first predefined number is reached;

starting a second timer if the continuous loss of synchronization determined by the second counter for the secondary carrier indicates that a second predefined number is reached;

monitoring for a hold synchronization indication for the anchor carrier using a third counter;

maintaining a synchronization indication for the secondary carrier monitoring using a fourth counter;

stopping and resetting the first and second timers in case the counted amounts by the third and fourth counters reach a keep-sync indication predefined number;

declaring a radio link setup failure on the secondary carrier if the second timer expires before the amount counted by the fourth counter reaches a predefined number of keep-in-sync indications; and

ending an uplink transmission and enhanced dedicated channel (E-DCH) transmission operation on the secondary carrier if a radio link setup failure is declared on the secondary carrier.

6. The method of claim 5, wherein the keep-in-sync indication and the lose-sync indication are received from a layer 1(L1) entity.

7. The method of claim 5, further comprising:

declaring a radio link setup failure on the anchor carrier if the first timer expires before the amount counted by the third counter reaches a predefined number of keep-in-sync indications;

ending an uplink transmission and enhanced dedicated channel (E-DCH) transmission operation on the anchor carrier and the secondary carrier if a radio link setup failure is declared on the anchor carrier; and

initiating a cell update procedure if the radio link setup failure is declared on the anchor carrier.

8. The method of claim 7, further comprising:

ending downlink reception and high speed downlink shared channel (HS-DSCH) operation on the anchor carrier and the supplementary carrier in the event that a radio link setup failure is declared on the anchor carrier.

9. An apparatus for performing dual carrier operation, the apparatus comprising:

a first timer;

a second timer;

a first counter configured to monitor for a keep-synchronized indication for an anchor carrier after the first timer is started;

a second counter configured to maintain a synchronization indication for secondary carrier monitoring after the second timer is started;

means for declaring a physical channel setup failure on the anchor carrier if the first timer expires before the amount counted by the first counter reaches a predefined number of keep-in-sync indications; and means for declaring a physical channel setup failure on the secondary carrier if the second timer expires before the amount counted by the second counter reaches a predefined number of keep-in-sync indications; and

means for ending an uplink transmission on the secondary carrier if a physical channel setup failure is declared on the secondary carrier, and means for ending a fractional dedicated physical channel (F-DPCH) reception process on the secondary carrier if a physical channel setup failure is declared on the secondary carrier.

10. The apparatus according to claim 9, wherein the means for ending uplink transmissions is configured to revert to a previous configuration if a physical channel setup failure is declared on the anchor carrier.

11. The apparatus of claim 9, wherein in the event that the physical channel setup failure is declared on the secondary carrier, ending uplink transmission and enhanced dedicated channel (E-DCH) operations on the secondary carrier and continuing uplink transmission and E-DCH transmission operations on the anchor carrier.

12. The apparatus of claim 9, wherein the first and second timers are stopped and reset before expiration if an amount counted by one of the counters reaches a keep-sync indication predefined amount.

13. An apparatus for performing dual carrier operation, the apparatus comprising:

a first counter configured to monitor for an out-of-synchronization indication for an anchor carrier;

a second counter configured to monitor for an out-of-sync indication for a secondary carrier;

a first timer configured to start if a consecutive loss of synchronization determined by the first counter for the anchor carrier indicates that a first predetermined number is reached;

a second timer configured to start if a continuous loss of synchronization determined by the second counter for the secondary carrier indicates that a second predetermined number is reached;

a third counter configured to maintain a synchronization indication for the anchor carrier monitoring;

a fourth counter configured to monitor for a keep-synchronization indication for the secondary carrier, wherein the first and second timers are stopped and reset if the amount counted by the third and fourth counters reaches a keep-synchronization indication predefined number;

means for declaring a radio link setup failure on the secondary carrier if the second timer expires before the amount counted by the fourth counter reaches a predefined number of keep-in-sync indications; and

means for ending uplink transmission and enhanced dedicated channel (E-DCH) transmission operations on the secondary carrier if a radio link setup failure is declared on the secondary carrier.

14. The apparatus of claim 13, wherein the apparatus further comprises: means for declaring a radio link setup failure on the anchor carrier if the first timer expires before the amount counted by the third counter reaches a predefined number of keep-in-sync indications; means for ending an uplink transmission and enhanced dedicated channel (E-DCH) transmission operation on the anchor carrier and the secondary carrier if a radio link setup failure is declared on the anchor carrier; and means for initiating a cell update procedure if the radio link setup failure is declared on the anchor carrier.

15. The apparatus of claim 14, further comprising means for ending downlink reception and high speed downlink shared channel (HS-DSCH) operations on the anchor carrier and the secondary carrier if a radio link setup failure is declared on the anchor carrier.