RU2456778C2 - Method and device to complete message transfer in enhanced channel of arbitrary access - Google Patents

Abstract

FIELD: information technologies.

SUBSTANCE: method to complete transfer of an enhanced dedicated channel (E-DCH) in condition of a forward access channel of a cell (CELL_FACH) by a wireless transfer/reception unit (WTRU), includes the following stages, where: it is identified, using a WTRU, that a buffer is empty; provided that the buffer is empty, scheduling information (SI) transfer is launched by means of WTRU in the E-DCH transfer, with a zero total condition of the buffer of the enhanced dedicated channel (E-DCH) (TEBS); the condition is identified, by means of WTRU, for completion of the last transfer of data of hybrid automatic repeated query (HARQ); and provided that the buffer is empty and the last transfer of HARQ is completed, assignment of E-DCH resources is released by means of WTRU.

EFFECT: higher efficiency of using resources.

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Description

FIELD OF THE INVENTION

The present invention relates to wireless communications.

State of the art

In wireless communication systems, access to radio resources is controlled through a radio network. When the wireless transceiver (WTRU) has data to transmit to the network, the WTRU requests access to radio resources before transmitting its payload. In the Third Generation Partnership Project (3GPP) network, the WTRU can transmit on the uplink using a controversial channel known as a random access channel (RACH). Since access to the RACH is controversial, a conflict can arise when multiple WTRUs access resources simultaneously.

The current 3GPP RACH access procedure comprises a ramp up power preamble, followed by channel acquisition information and message transmission for random access. Since the RACH is a shared channel, in order to bypass the WTRU holding the shared radio resources for a long time, only relatively short payloads of messages are transmitted on the RACH; this leads to a relatively low data rate. RACH is thus used to transmit short control messages. Typically, WTRUs requesting high data rates may be configured by the network to use the allocated resources.

The data rate provided by RACH is sufficient to transmit short control messages that support mainly voice communication, however, it may be inefficient for transmitting data messages related to new non-real-time data services, such as Internet browsing, Email, etc. For such data services, traffic is torn by nature, and long periods of inactivity may exist between successive transmissions. For example, applications that require frequent transmission of activity-supporting messages can lead to inefficient use of allocated resources. In such cases, it may be beneficial for the network to use shared resources to transmit data instead. However, there is always a difficulty in the low data rate offered by RACH.

To overcome these difficulties, it has been proposed to use an enhanced dedicated channel (E-DCH) in the CELL_FACH state in order to increase the data rate of the shared channel.

Figure 1 is an access scheme enhanced RACH (E-RACH). The E-RACH procedure may include an RACH preamble phase and an E-RACH message phase. During the initial phase of the RACH preamble, the WTRU transmits the RACH preamble, it continues to transmit the preamble, as the transmit power increases, until it accepts the initial resource assignment. The WTRU may also perform conflict detection and resolution if other WTRUs attempt to access the RACH during this time. Once the WTRU has received permission to access the RACH, the WTRU may transmit data until resources are released or until the WTRU transitions to another state.

As mentioned above, it has been proposed to use the E-DCH in the CELL_FACH state to increase the data rate of the shared channel. However, in the current standard, there are no methods for completing the phase of an E-RACH message. Accordingly, it would be useful to provide a method and apparatus for completing the phase of an E-RACH message in an E-RACH.

Disclosure of invention

A method and apparatus for completing an E-RACH message in an E-RACH transmission is provided. Launchers for completing E-RACH messages are also provided. Actions to complete the E-RACH messages or transition to the CELL_DCH state are provided to release the shared E-DCH resources when arriving in the CELL_FACH state.

A method is provided for completing an enhanced random access channel (E-RACH) message on an E-RACH transmission, determining that the buffer is empty; triggering the transmission of scheduling information (SI) with a value of zero total buffer status of the enhanced dedicated channel (E-DCH) (TEBS); defining the latest data transfer hybrid request automatic repeat (HARQ); and releasing E-DCH resource allocation.

A method for completing an enhanced random access channel (E-RACH) message in an E-RACH transmission, where the network waits until the HARQ buffer is empty, and when an SI with a value of zero is received, resources are released.

Brief Description of the Drawings

A more detailed understanding can be obtained from the following description, presented by way of example, and can be understood in conjunction with the accompanying drawings, in which:

Figure 1 illustrates an E-RACH access scheme with an E-DCH;

Figure 2 illustrates a wireless communication system;

FIG. 3 illustrates a functional block diagram of a WTRU and a base station of the wireless communication system shown in FIG. 2;

Figure 4 illustrates a block diagram of the allocation and release of E-DCH resources and;

5 illustrates a diagram of trigger signals for starting a timer that a WTRU can initiate for timers;

6 illustrates a flowchart of a method for releasing E-RACH resources based on a state of a WTRU queue or buffer;

7 illustrates a flowchart of a network configured to determine the completion of an E-RACH message transmission;

FIG. 8 illustrates a flowchart of E-DCH resource release when the WTRU transitions from the CELL_FACH state to the CELL_DCH state; and

FIG. 9 illustrates a flowchart for releasing E-DCH resources while in a CELL_FACH state.

The implementation of the invention

As mentioned in the following description, the term "wireless transmit / receive device (WTRU)" includes, but is not limited to, user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a mobile phone, a personal digital assistant (PDA ), a computer, or any other type of user device capable of functioning in a wireless environment. When referred to in the following description, the terminology “base station” includes, but is not limited to, a Node-B, a site controller, an access node (UE), or any other type of communication device capable of operating in a wireless environment.

As mentioned in this application, the terms RACH and E-RACH can be used to describe a resource that is selected by the WTRU to implement contention-based uplink access. The term E-RACH resource may also indicate any combination of a scrambling code, channelization code, time slot, accessibility, or signature sequence that is associated with the E-RACH channel in a future system architecture. The term E-RACH may also indicate the use of the E-DCH in CELL_FACH, CELL_PCH, URA_PCH states or idle mode.

As mentioned below, the term Advanced Media Access Control (MAC) -e / es objects may refer to MAC objects used to perform E-DCH transmission in CELL_FACH state, which are referred to as MAC-i / is in Release 8. MAC-e / es and MAC-i / is are MAC entities that control a transport channel, such as an enhanced dedicated transport channel (E-DCH).

FIG. 2 illustrates a wireless communication system 200 including a plurality of WTRU 210, a base station 220, a CRNC 230, an SRNC 240, and a core network 250. As shown in FIG. 2, the WTRU 210 are in communication with a base station 220 that communicates with CRNC 230 and SRNC 240. Although three WTRU 210, one base station 220, one CRNC 230 and one SRNC 240 are shown in FIG. 3, it should be noted that any combination of wireless and wired devices can be included in the wireless communication system 200.

FIG. 3 illustrates a functional block diagram 300 of a WTRU 210 and a base station 220 of the wireless communication system 200 of FIG. 2. As shown in FIG. 3, the WTRU 210 interacts with the base station 220, and both are configured to complete the method of completing message transmission in the E-RACH.

In addition to the components that can be incorporated into a typical WTRU, the WTRU 210 includes a processor 215, a receiver 216, a transmitter 217, and an antenna 218. The processor 215 is configured to implement a method to complete a message in an E-RACH. Receiver 216 and transmitter 217 communicate with processor 215. Antenna 218 communicates with both receiver 216 and transmitter 217 to facilitate the transmission and reception of wireless data.

In addition to the components that can be found in a typical base station, base station 220 includes a processor 225, a receiver 226, a transmitter 227, and an antenna 228. The processor 225 is configured to implement a method for completing a message transmission in an E-RACH. Receiver 226 and transmitter 227 communicate with processor 225. Antenna 228 is in communication with both receiver 226 and transmitter 227 to facilitate the transmission and reception of wireless data.

4 illustrates an E-DCH resource allocation and release diagram (400) using a trigger action (enable actions) for a WTRU. The first state corresponds to the WTRU 210, which operates without any E-DCH resources assigned to it (405). Once the uplink data (VLAN) is to be transmitted, the WTRU 210 requests E-DCH resources from the network by transmitting the preamble and waiting for a response on the Receive Indication Channel (AICH). In other words, the WTRU 210 can remain in this state until it receives a positive acknowledgment (ACK) by AICH or a negative acknowledgment (NACK) by AICH, followed by an E-AICH resource assignment index, which may also be referred to as WTRU 210 receiving the E-DCH index. After receiving an E-DCH resource assignment, the WTRU may transition to the next state in which E-DCH resources are allocated for enhanced uplink transmissions (410). The WTRU 210 can use these E-DCH resources for VLAN transmission until it receives a trigger signal, at which point the WTRU 210 releases resources 415. After the WTRU 210 releases resources, it returns to its initial state. As will be described in more detail below, the trigger signal may be based on a timer, it may be based on the state of the WTRU buffer, or may be based on signaling from an RNC or Node 220.

In one embodiment, the WTRU 210 may be configured to include a timer module. A timer module may include multiple timers, the timer may be associated with each logical channel or each MAC-d stream. The timer module may be configured to indicate the maximum allowable transmission time for a logical channel (i.e., a dedicated control channel (DCCH), a dedicated traffic channel (DTCH), a common control channel (CCCH), etc.). Values for the timer module may be predefined or reported for the WTRU 210. Timers may be activated upon the first transmission WTRU 210 after the E-DCH resource index is received. The WTRU may be configured to release E-DCH resources upon expiration of its associated timer. For example, the WTRU 210 may be configured to release a common E-DCH resource when the maximum allocation time of a common E-DCH resource for CCCH has been reached. This embodiment would allow flexible configuration of a shorter transmission time for a logical channel such as a CCCH.

Also, the timer module may be configured based on the identity of the logical channel and the absence of an E-DCH Temporary Radio Network Identifier (E-RNTI). More specifically, a maximum E-DCH allocation time may be assigned to CCCH transmission when an E-RNTI is not present. If the timer expires and the WTRU 210 currently performing the CCCH transmission does not have an E-RNTI, the E-RACH access ends and resources are released. If CCCH transmission occurs and the E-RNTI is present (which may occur during the cell update procedure), then the WTRU 210 is not configured to have a maximum E-DCH allocation time and the timer will not affect the WTRU 210.

Alternatively, the network may configure a transmission duration timer based on the presence or absence of an E-RNTI. The WTRU 210 may be configured to have a maximum E-DCH allocation time if it has data (user plane or control plane) to transmit and no E-RNTI is present. Otherwise, if an E-RNTI is present, the WTRU 210 is not configured with a maximum allocation time of the E-DCH.

5 illustrates a diagram of trigger signals for starting a timer that the WTRU 210 can initiate for timers T ₁ and T ₂ (500). Timers, such as T ₁ conflict resolution and CCCH timer T ₂ , are started according to one of the triggering signals 501-505. This embodiment may include any combination of at least one of the trigger signal 501-505 shown to start the timer 506. The timer may start if the ACK associated with the transmitted preamble signature is received on AICH or E-AICH (501) . The timer may start as soon as Radio Resource Control (RRC) provides the MAC with timer values, and after receiving the E-DCH resource index (502). The timer may start if the WTRU 210 starts the first transmission of the dedicated physical control channel (DPCCH) preamble (503). The timer may start when the initial DPCCH transmission ends, after the transmission time intervals (TTI) of the E-DCH deferred transmission or the first MAC Protocol Data Unit (PDU) moves to the physical layer (504). Or, a timer may start when the WTRU 210 starts an E-DCH transmission (505). In addition, the WTRU 210 may initiate a timer when an E-DCH Unlimited Grant Channel (E-AGCH) for conflict resolution carrying the E-RNTI of the WTRU 210 is received. Other triggers may also be used as intended.

Alternatively, the WTRU 210 timer module may be configured so that the length of time available for the WTRU 210 is based on the number of information bits that must be transmitted. The length of time varying for the WTRU 210 may also be based on the number of radio link controllers (RLCs) or MAC PDUs. Additionally, it can also be based on the number of RLC service data units (SDUs).

Alternatively, the duration of an E-RACH message may be fixed at either 10 ms or 20 ms (as specified in existing 3GPP standards). As a result, the message phase in the E-RACH may be active for a maximum number of frames or subframes. The information element (IE) of the duration of the E-RACH message may be broadcast as part of a system information broadcast (SIS) or may be included as part of a signaling L1. For example, an E-RACH message duration IE may be transmitted with initial resource allocation or during the conflict resolution phase. In addition, the duration of the E-RACH message may be associated with an access service class.

Alternatively, the WTRU 210 may count the number of transmissions and retransmissions and use the count as a trigger to stop the phase transmission of the E-RACH message. For example, if the WTRU 210 is configured to repeat an automatic repeat request (ARQ) type of operation and transmission over sequential TTIs, then the WTRU may be configured to complete the phase transfer of the E-RACH message after K retransmissions. It should be noted that the K value may be predefined in the WTRU, broadcast as part of the NRI, or reported during the E-RACH allocation phase.

6 illustrates a flowchart of a method for releasing E-DCH resources based on queue or buffer conditions of the WTRU 210. When the WTRU 210 has data in a transmission buffer, the WTRU 210 may transmit data (605). After transmission, the WTRU 210 may check if the transmission buffer is empty (610). If the transmission buffer is not empty, then the WTRU 210 will transmit data that is in the buffer (605). If the transmit buffer is empty (610) (i.e., the Full E-DCH Buffer State (TEBS) is zero), an optional check will be made to see if the sleep timer has expired (615). If the inactivity timer has expired, then the WTRU 210 may be configured to transmit a special or reserved SI value, where TEBS is set to zero (620). The WTRU 210 may be configured to release E-DCH resources (630) after the inactivity timer has expired (615), and the inactivity timer is started as soon as the TEBS is reset. It is assumed that the WTRU 210 will be inactive if no VLAN or downlink (VLAN) traffic has been received. Alternatively, implicit release timers (i.e., an inactivity timer) may be restarted based on a triggering mechanism when the WTRU 210 decodes its H-RNTI on a high speed shared control channel (HS-SCCH). Once the inactivity timer has expired, the WTRU 210 may be configured to transmit a special or reserved SI value (620). For example, a special or reserved SI value may include TEBS with a value set to zero (620). SI set to zero TEBS can be used to transmit a network signal to free up resources. After successfully transmitting the SI and emptying the HARQ buffers (625), the WTRU 210 releases the E-DCH resources (630).

Alternatively, the WTRU 210 may transmit a network signal indicating a release of resources. The signal may contain a special combination of SI and Happy Bit, a new MAC signaling where a special combination of MAC header fields can be reinterpreted. Alternatively, the field may be added to the header of the enhanced MAC-e or MAC-e trailer indicating a request to complete the phase transfer of the E-RACH message. For example, the WTRU 210 may transmit this signal to the network through a reserved combination of a Data Description Identifier (DDI). In another alternative, the signal may be a new RRC message; with a special value of the enhanced transport format combination index (E-TFCI) index field in the E-DPCCH or a special combination of E-DPCCH fields or a new L1 message. The final resource release decision may be determined by the network, which may indicate the release of resources back to the WTRU 210. Alternatively, the WTRU 210 may simply stop transmitting the E-DCH as a means to indicate the end of the phase of the E-RACH message, at which point the network can release the radio -resources.

Alternatively, the timer module may be configured to start when the WTRU 210 has already transmitted all the PDUs that were present when the E-RACH was initiated or the buffer had already passed a predetermined threshold level. The threshold level may be an absolute value or based on a relative measure using the initial size of the queue.

Releasing transmission resources of all PDUs located in a buffer that passes a predetermined threshold level can free E-RACH resources for other WTRUs 210. For example, threshold levels can be set to allow the network to negotiate fairness between the WTRUs 210 and transmission delay. These layers may be configured through system information, or they may be pre-configured in the WTRU 210.

In addition, there may be procedures for the physical layer, which can trigger the completion of the transmission of the E-RACH message. This includes cell reselection and measurements controlled by FACH measurement events or radio link outage detection (LR).

Alternatively, the WTRU 210 may pause the entire transmission during the measurement event. Also, the scheduler at Node-B 220 may be aware of the measurement event and may also suspend any downlink access, ACK, or NACK transmission. Upon resuming normal operation, the network can optionally transfer the initial access permission so that the power control cycle can be restored. Or, the network may expect indication from the WTRU 210 using a linear increase in preamble power or a similar procedure. Optionally, the WTRU 210 may indicate a reason for termination in a termination signal or termination message. Reasons for E-RACH termination may include interruption of the LR and termination of the E-RACH transmission.

FIG. 7 illustrates a flowchart of a network configured to determine completion of an E-RACH message (700). The completion of the phase of the E-RACH message can be set by the network based on the reception of the amount of data indicated in the initial SI (705) UTRAN of the universal mobile telecommunications system (UMTS). Alternatively, it may be established based on a UTRAN receiving the amount of data indicated in subsequent SIs or indicated using another mechanism. The UTRAN may use SI values to determine when to complete the transmission of a message. More specifically, a SI set to zero TEBS (710) signals the network that the WTRU 210 is freeing resources as soon as the data transfer in the HARQ buffers is completed. The UTRAN releases E-DCH resources (720) after the SI with zero TEBS is received and there are no HARQ transmissions (715).

Alternatively, the UTRAN may simply turn off the transmission of the associated F-DPCH, and explicit additional signaling will not be used. This approach can be used when both the WTRU 210 and the network are aware that the transfer must be completed.

Alternatively, SI may be transmitted each time the buffer fill is changed. Alternatively, SI can be transmitted each time the buffer filling is changed with a predetermined or signaled amount (i.e., additional data is received in the buffer), even if new data is not from logical channels with a higher priority. If TEBS is zero, then the SI trigger mechanism can be modified to allow the SI to be transmitted. An SI set to zero TEBS signals the network that the WTRU is freeing resources as soon as the data transfer in the HARQ buffers is complete, and the UTRAN is also freeing E-DCH resources. Alternatively, SI may be transmitted in each HARQ transmission when the WTRU 210 is in the CELL_FACH state or is occupying E-RACH resources.

In another termination option, the UTRAN may explicitly report the end of the E-RACH transmission. Once the UTRAN determines the end of the transmission of the E-RACH message, it signals the WTRU 210 by transmitting a special value on the E-AGCH (for example, 0 grant). Or, the UTRAN signals the WTRU 210 by transmitting the RRC message on the FACH or on the high speed downlink shared channel (HS-DSCH) if the WTRU 210 is configured for the HS-DSCH in the CELL_FACH state. Alternatively, the network signals the WTRU 210 when using L1 signaling. This may include stopping the partially dedicated physical channel (F-DPCH) or transmitting a flag or a combination of predefined fields on the HS-SCCH if the WTRU 210 is configured for the HS-DSCH in the CELL_FACH state, for example using the HS-SCCH order.

Alternatively, the termination of the E-RACH message may be established based on the lack of activity on the enhanced dedicated physical data channel (E-DPDCH) or transmission on the enhanced DPCCH (E-DPCCH).

The completion of the E-RACH part may also be established based on the status of the WTRU 210 scheduling requests. As an example, the UTRAN may monitor the received SI or Satisfaction Bit status. If this information indicates low usage, the network may decide to complete the current transmission of the E-RACH message so that other WTRUs 210 can access the resources. Alternatively, if this information indicates high utilization and there is still a need to set the Satisfaction Bit to unsatisfactory, then the UTRAN may decide to transition the WTRU 210 to CELL_DCH state. As another alternative, the UTRAN may use a traffic volume measurement report (such as an uplink RRC measurement report) to determine that the WTRU 210 does not have any additional data or a small amount of data to transmit.

Alternatively, the UTRAN may implicitly signal the WTRU 210 to free an E-RACH resource without transmitting predetermined physical channels or signals in a predetermined amount of time. In other words, the WTRU 210 releases E-RACH resources if it does not receive any transmission from the UTRAN to any E-AGCH assigned to the WTRU 210, the E-RGCH associated with the E-RACH resource that is used by the WTRU 210, F -DPCH associated with an E-RACH resource that is used by the WTRU 210, and / or HS-SCCH or a high speed physical downlink shared channel (HS-PDSCH) that is assigned to the WTRU 210.

Optionally, the UTRAN may indicate a reason for termination in a termination signal or termination message. Reasons for E-RACH termination may include, but are not limited to, an LR failure, termination of E-RACH transmission, and network reboot.

FIG. 8 is a structural diagram of E-DCH resources released when the WTRU 210 transitions from the CELL_FACH state to the CELL_DCH state. WTRU 210 operates without any E-DCH resources assigned (805). After receiving an E-DCH resource assignment on AICH or E-AICH or NACK on AICH, followed by an E-AICH resource assignment index, which may also be referred to as a WTRU 210 receiving an E-DCH index, WTRU 210 may access E-DCH resources assigned to it in CELL_FACH state (810). The WTRU 210 holds the E-DCH resource control until it receives a reconfiguration message (e.g., via FACH or HS-DSCH) indicating that a transition to the CELL_DCH state may be completed. Then E-DCH resources are released (815). And the WTRU 210 may transition to the CELL_DCH state (820). If the UTRAN reconfigures the WTRU 210 to the CELL_DCH state with allocated E-DCH resources, while the WTRU 210 transmits on the E-RACH, then the WTRU 210 can release the E-RACH resources during activation, which is specified in the reconfiguration message in case of synchronous reconfiguration . Alternatively, the WTRU 210 may release E-RACH resources at a fixed delay time before or after the activation time. Alternatively, the WTRU 210 may release E-RACH resources immediately upon receipt of an RRC reconfiguration message.

Additionally, the WTRU 210 may be configured to release E-RACH resources at the same time as it configures itself to transmit on dedicated E-DCH resources. Alternatively, the WTRU 210 may release E-RACH resources at a fixed delay before or after configuring itself for transmission using dedicated E-DCH resources; or release E-RACH resources as soon as the WTRU 210 is fully synchronized with the UTRAN with dedicated E-DCH resources.

FIG. 9 is a flowchart of a procedure for releasing E-DCH resources, in CELL_FACH state or inoperative mode, when triggering signals of E-RACH completion occur. WTRU 210 begins the process of completing the E-RACH (905). WTRU 210 may be configured to stop any ongoing E-AGCH, E-RGCH, and E-HICH reception procedures (910). WTRU 210 may be further configured to stop any ongoing E-DPCCH and E-DPDCH transmissions (915). Then, the WTRU 210 can perform the MAC reset procedure (920) and free HARQ buffers (930). The procedure for resetting enhanced MAC-e / es may include clearing HARQ processes, discarding any remaining segments in the segmented object of enhanced MAC-e / es, and resetting the transmission sequence number CURRENT_ (TSN CURRENT_ value) to zero. Alternatively, if the remaining segment is from a DTCH or DCCH of a logical channel, the WTRU 210 may resume transmitting the segment with the remaining process. The indication may be transmitted to the SRNC 240 via Iub signaling to discard any stored segment and reset the TSN reordering number.

If the E-DCH is completed and the DTCH or DCCH transmission is active, the WTRU 210 may clear the HARQ processes (930) and discard any remaining segments in the MAC-i / is segmentation object.

Other logical channels or queues of the MAC-i / is object that do not match the CCCH are not reset. The Node-B 220 may be configured to perform a MAC-is reset of the CCCH. In other words, any segment can be discarded, and the expected TSN is set to its initial value. If the MAC-is object is located in CRNC 230, the Node-B 220 uses Iub signaling indicating the MAC-is object to perform a reset. However, the MAC-i object associated with the E-DCH resource is discarded (i.e., HARQ program buffers are cleared).

When the WTRU 210 performs a full MAC-i / is reset, the MAC-i object in the SRNC 240 can be notified via a new Iub / Iur signaling that E-RACH access has been completed; thus, the MAC-i entity in the SRNC 240 can also perform a reset. More specifically, when the Node-B 220 completes the E-DCH connection with the WTRU 210, it releases the E-DCH resources, flushes the HARQ buffers, and notifies the SRNC 240 or CRNC 230 that the connection has been completed, and thus the CRNC 230 or SRNC 240 also perform a MAC reset. CRNC 230 or SRNC 240 is notified via Iub or Iur signaling. A new control bit may be introduced into the Iub or Iur frame format, or a new frame format may be defined to signal the release of resources to the SRNC 240 or CRNC 230.

Also, optionally, MAC-i / is reset, or segment dropping only, may be performed after a time interval (Tr) due to the completion of an E-RACH resource. A timer is also initiated on the network side. Tr can be a system-configured timer, transmitted to the WTRU 210 via an RRC message, through a system information unit (SIB), or pre-configured in the WTRU 210. The timer is initiated as soon as the E-DCH resources are completed in the WTRU 210.

The WTRU 210 may be configured to stop the timer if it is running and if the WTRU 210 attempts to perform E-RACH access. In addition, the WTRU 210 may also stop the timer if the WTRU 210 attempts to access the E-RACH and receives the assigned E-DCH resources, or the WTRU 210 receives the assigned E-DCH resources and solves the conflict resolution phase.

Alternatively, the WTRU 210, the Node-B 220 and / or the RNC can be configured with TSN_RESET_TIMER, and the WTRU 210 is configured to reset the TSN when the timer expires. Optionally, the WTRU 210 can perform a full MAC-e / es reset procedure when the timer expires.

E-DCH resources are released when a transition from the CELL_FACH state to the CELL_DCH state occurs.

The WTRU 210 and RNC can reset the value of the last used TSN number (ie, CURRENT_TSN) to the initial value after releasing the E-DCH resource set used by the WTRU 210. Each WTRU 210 and RNC may include synchronized timers in which a timer expires about the release of E-DCH resources. After the timer has expired and resources are freed up, the WTRU 210 can reset the TSN and, optionally, complete the complete reset procedure of the enhanced MAC-e / es.

Alternatively, the UTRAN may streamline the release of resources. The UTRAN may inform the WTRU of an indication that resources should be released. In this case, after receiving the message, the WTRU 210 and the UTRAN reset the TSN to the initial value.

Alternatively, the TSN may be reset after the inactivity timer has expired. In this case, an inactivity timer can be started on both the WTRU 210 and the network after the last MAC-e PDU has been transmitted and received, respectively. If the timer expires, the WTRU 210 and the RNC resets the TSN to its initial value. Optionally, a complete reset procedure for enhanced MAC-e / es can be performed.

As another alternative, the TSN may not be reset. The last used TSN values are stored in memory and continuously incremented for each new transmission, regardless of the set of E-DCH resources used or the time at which the transmission takes place.

Alternatively, the TSN may be set to its initial value, and, optionally, a complete reset of the enhanced MAC-e / es may occur when cell reselection occurs. A TSN or MAC-e / es reset may always occur after the WTRU 210 performs cell reselection. Alternatively, this can only happen when a relocation of the serving radio network subsystem (SRNS) occurs. The RNC may signal a TSN reset with an explicitly set MAC-e / es reset indicator, or the WTRU 210 may implicitly detect that the SRNS movement has occurred due to the presence or change of a new UTRAN RNTI (U-RNTI).

Options for implementation

1. A method for completing an enhanced random access channel (E-RACH) message when E-RACH is transmitted, the method comprising the steps of:

determine that the buffer is empty.

2. The method of embodiment 1, further comprising the steps of:

start transmitting scheduling information (SI) with zero common enhanced dedicated channel (E-DCH) buffer state (TEBS);

determining the latest HARQ data transmission; and

release the assignment of E-DCH resources.

3. The method according to any one of embodiments 1-2, wherein the inactivity timer is started when the buffer is empty.

4. The method of embodiment 3, wherein the SI transmission is called when the idle timer expires.

5. The method according to option 3, in which the inactivity timer is restarted to receive data.

6. A method for completing an enhanced random access channel (E-RACH) message in an E-RACH transmission, the method comprising the steps of:

receiving initial scheduling information (SI) with a common buffer state enhanced enhanced channel (E-DCH) (TEBS); and

determine that TEBS is zero.

7. The method of embodiment 6, further comprising the step of:

wait until the hybrid auto repeat request (HARQ) buffer is empty; and

free assignment of E-DCH resources.

8. A method for completing an enhanced random access channel (E-RACH) in an E-RACH transmission, the method comprising the steps of:

release the E-RACH message during the transition from the direct cell access channel state (CELL_FACH) to the dedicated cell channel state (CELL_DCH).

9. A wireless transmit-receive (WTRU) device, comprising:

a receiver configured to receive Enhanced Dedicated Channel (E-DCH) resources on an Receive Indication Channel (AICH) and A-DICH AICH (E-AICH).

10. The WTRU of embodiment 9, further comprising:

a processor configured to access E-DCH resources in a direct cell access channel state (CELL_FACH) to receive a reconfiguration message indicating a switch to a dedicated cell channel state (CELL_DCH) and release E-DCH resources based on switching to CELL_DCH state.

11. A method for completing an enhanced random access channel (E-RACH) message in an E-RACH transmission, the method comprising the steps of:

receiving an explicit E-DCH termination signal; and

release E-DCH resources.

12. The method of embodiment 11, wherein the explicit E-DCH termination signal comprises a special value signaled on an E-DCH Unlimited Channel (E-AGCH).

13. A method for completing an enhanced random access channel (E-RACH) message in an E-RACH transmission, the method comprising the steps of:

initiate a timer in response to a trigger signal.

14. The method of embodiment 13, further comprising

release of resource assignment for the common control channel (CCCH) when the maximum allowable transmission time for the CCCH has been reached.

15. The method of embodiment 14, wherein the maximum dedicated dedicated channel (E-DCH) assignment time is assigned to CCCH transmission when the E-DCH temporary radio network identifier is not present.

16. The method according to one of the options 13-15, in which the timer starts when the positive acknowledgment (ACK) associated with the transmitted preamble signature is received on the Receive Indication Channel (AICH) or AICH enhanced dedicated channel (E-DCH) (E- AICH).

17. The method according to one of embodiments 13-16, wherein the timer starts when Radio Resource Control (RRC) provides timer values for Media Access Control (MAC), and upon receipt of an Enhanced Dedicated Channel (E-DCH) resource index.

18. The method according to one of embodiments 13-17, wherein the timer starts when the wireless transmit and receive device (WTRU) starts the first transmission of the dedicated physical control channel (DPCCH) preamble.

19. The method according to one of embodiments 13-18, wherein the timer starts when the first DPCCH transmission is completed after the transmission time intervals (TTI) of the delayed transmission of the enhanced dedicated channel (E-DCH) or the first control protocol data unit (PDU) medium access (MAC) will go to the physical layer.

20. The method according to one of embodiments 13-19, wherein the timer starts when the wireless transmit reception device (WTRU) starts transmitting an enhanced dedicated channel (E-DCH).

21. The method according to one of embodiments 13-20, wherein the wireless transmit reception unit (WTRU) can initiate a timer when an Unlimited Enhanced Dedicated Channel (E-DCH) (E-AGCH) conflict resolution channel carrying an E-DCH temporary is received radio network identifier for the WTRU.

22. A wireless transmission reception device (WTRU), comprising:

a processor configured to release the resources of the enhanced dedicated channel (E-DCH) when the maximum allowable transmission time for the common control channel (CCCH) has been reached.

23. A method for completing an enhanced random access channel (E-RACH) message in an E-RACH transmission, the method comprising the steps of:

complete the E-RACH message in case of cell reselection or radio link failure.

24. Node-B, containing:

a processor configured to determine the end of a message transmission over an enhanced random access channel (E-RACH).

25. Node-B of embodiment 24, further comprising

a transmitter connected to the processor, wherein the transmitter is configured to transmit a special value over an unlimited grant channel (E-AGCH) of an enhanced dedicated channel (E-DCH) indicating the end of the transmission.

26. A method for releasing resources of an enhanced dedicated channel (E-DCH), under a direct cell access channel state (CELL_FACH), the method comprising the steps of:

complete the reception procedure of the enhanced dedicated channel (E-DCH) unlimited grant channel (E-AGCH) channel, the E-DCH relative grant channel (E-RGCH), and the E-DCH hybrid automatic repeat request indicator (HARQ) channel (E-HICH).

27. The method of embodiment 26, further comprising stages in which:

complete the transfer procedures of the dedicated physical control channel E-DCH (E-DPCCH), enhanced dedicated physical data channel (E-DPDCH); and

reset the medium access control (MAC) object.

28. The method according to one of options 26-27, in which the channels terminate after the transmission signal of the enhanced random access channel (E-RACH) has been received.

29. The method according to one of embodiments 26-28, wherein the channels terminate when the common control channel (CCCH) timer has expired.

30. The method according to one of embodiments 26-29, wherein the channels terminate when scheduling information (SI) is zero.

31. The method according to one of embodiments 27-30, wherein the MAC reset procedures include cleaning the Hybrid Automatic Repeat Request (HARQ) processes, discarding the remaining segments in the segmentation object of the MAC object, and resetting the transmission sequence number (TSN) value to zero.

32. The method according to one of options 26-31, in which resources are released when the idle timer expires.

Although characteristic features and elements are described above in specific combinations, each characteristic feature or element may be used individually without other features and elements, or in various combinations with or without other features and elements. The methods or flowcharts of the algorithms presented in this application can be implemented in a computer program, software, or firmware, materially embodied in a computer-readable storage medium for execution by a general-purpose computer or processor. Examples of computer-readable storage media include read-only memory (ROM), random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard drives and removable drives, magneto-optical media, and optical media such like CD-ROMs, and digital versatile disks (DVDs).

Suitable processors include, by way of example, 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 primary DSP, a controller, a microcontroller, application oriented integrated circuits (ASICs) ), user programmable gate array (FPGA) circuits, any other type of integrated circuit (IC) and / or state machine.

The processor, together with the software, can be used to implement a radio frequency transceiver for use in a wireless transmit reception device (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or computer host. The WTRU can be used in conjunction with modules implemented in hardware and / or software, such as a camera, camcorder module, videophone, speakerphone, vibration device, speaker, microphone, television transceiver, hands-free headset, keyboard, Bluetooth® module , frequency, radio frequency modulation (FM) unit, display unit with liquid crystal display (LCD), display unit based on organic light emitting diodes (OLED), digital audio player, universal a player, a video game playback module, an Internet browser and / or any wireless local area network (WLAN) or an over-wide bandwidth (UWB) module.

Claims (7)

1. A method of completing the transmission of an enhanced dedicated channel (E-DCH) in a direct cell access channel (CELL_FACH) state by a wireless transmit / receive device (WTRU), the method comprising the steps of:
determining, by the WTRU, that the buffer is empty;
provided that the buffer is empty, start transmission of scheduling information (SI) in the E-DCH transmission with the WTRU with zero equal to the general state of the enhanced dedicated channel (E-DCH) buffer (TEBS);
determining, by the WTRU, the condition that the last data transmission of the hybrid automatic repeat request (HARQ) is completed; and
provided that the buffer is empty and the last HARQ data transfer is completed, the E-DCH resource allocation is freed by the WTRU. 2. The method of claim 1, wherein the inactivity timer is started when the buffer is empty. 3. The method of claim 2, wherein the SI transmission starts when the inactivity timer expires. 4. The method according to claim 1, in which the E-DCH transmission occurs under the condition that the response channel for the E-DCH (E-AICH) is received for the preamble transmitted by the WTRU. 5. The method according to claim 1, further comprising the step of ending the E-RACH message in the event of cell reselection or radio link failure. 6. A wireless transmit / receive device (WTRU) for completing transmission of an enhanced dedicated channel (E-DCH) in a direct cell access channel state (CELL_FACH), comprising:
means for determining that the buffer is empty;
means for triggering, provided that the buffer is empty, transmitting scheduling information (SI) in an E-DCH transmission with zero total buffer status of the enhanced dedicated channel (E-DCH) buffer (TEBS);
means for determining a condition that the last data transmission of the hybrid automatic repeat request (HARQ) is complete; and
means for releasing the assignment of E-DCH resources, provided that the buffer is empty and the last HARQ data transfer is completed. 7. The WTRU of claim 6, further comprising means for completing the E-DCH transmission subject to cell reselection or radio link failure.

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