HK1183193A - Method and wireless transmit/receive unit for control of enhanced dedicated channel transmissions - Google Patents

Abstract

The present invention discloses a method implemented in a wireless transmit/receive unit (WTRU) for controlling enhanced dedicated channel (E-DCH) transmissions and a WTRU including an enhanced uplink medium access control (MAC-e) entity for controlling E-DCH transmissions. An enhanced uplink medium access control (MAC-e/es) entity processes a received scheduling grant to calculate a serving grant. The MAC-e/es entity determines whether both an H-ARQ process for scheduled data and scheduled data are available. If an H-ARQ process for scheduled data and scheduled data are available, the MAC-e/es entity determines whether a serving grant exists. The MAC-e/es entity calculates a remaining power based on maximum allowed power and restricts an E-DCH transport format combination (E-TFC) based on the remaining power. The MAC-e/es entity selects an E-TFC using the serving grant and generates a MAC-e PDU. The MAC-e/es entity may process the received scheduled grant at each transmission time interval (TTI) or may store the received scheduled grant in a grant list until there is E-DCH data to transmit.

Description

Method for controlling transmission of enhanced dedicated channel and wireless transmitting/receiving unit

The application is a divisional application of Chinese patent application with the application number of 200680022388.9, the application date of 26/7/2006 and the name of 'method and device for controlling transmission of enhanced dedicated channels'.

Technical Field

The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and apparatus for controlling enhanced dedicated channel (E-DCH) transmissions.

Background

Methods to improve Uplink (UL) coverage, throughput, and transmission delay have been currently studied in the third generation partnership project (3 GPP). To achieve these goals on the E-DCH, UL resource control (i.e., physical channels) has been moved from the Radio Network Controller (RNC) to the node B.

In order to reduce complexity and power consumption, a wireless transmit/receive unit (WTRU) needs to be properly controlled and coordinated in performing enhanced uplink medium access control (MAC-E/es) functions, such as E-DCH transport format combination (E-TFC) selection and multiplexing processes, maintaining transmission power calculations, and Absolute Grant (AG) and Relative Grant (RG) processes.

Disclosure of Invention

The present invention relates to a method and apparatus for controlling E-DCH transmissions. The MAC-e/es entity of the WTRU receives the scheduling grant and processes the scheduling grant to calculate a serving grant. The MAC-e/es entity determines a hybrid automatic repeat request (H-ARQ) process for scheduled data and whether the scheduled data is available. If both H-ARQ process for scheduled data and the scheduled data are available, the MAC-e/es entity determines whether a serving grant exists. The MAC-E/es entity then calculates a remaining power based on the maximum allowed power and limits the E-TFC based on the remaining power. The MAC-E/es entity selects an E-TFC using the serving grant and generates a MAC-E Protocol Data Unit (PDU) for transmission. The MAC-E/es entity may process the received scheduling grant at each Transmission Time Interval (TTI) or store the received scheduling grant on a grant list until there is E-DCH data to transmit.

The present invention also provides a method implemented in a wireless transmit/receive unit (WTRU) for controlling enhanced dedicated channel (E-DCH) transmissions, the method comprising: receiving a plurality of primary absolute grants for E-DCH transmissions at an upcoming Transmission Time Interval (TTI); processing at least one of the plurality of primary absolute grants to calculate at least one serving grant for an E-DCH transmission; identifying a hybrid automatic repeat request (H-ARQ) procedure for use for the upcoming TTI; determining whether the identified H-ARQ process for use for the upcoming TTI is an active H-ARQ process, wherein only active H-ARQ processes are used for scheduling transmission of data and non-active H-ARQ processes are not used for scheduling transmission of data; determining whether scheduling data is available for transmission in the upcoming TTI; in the case that scheduling data is available for transmission and the identified H-ARQ process is an active H-ARQ process and available for transmission of the scheduling data in the upcoming TTI: calculating a remaining power available for the upcoming TTI based on the maximum allowed power of the WTRU; performing E-DCH transport format combination (E-TFC) restriction according to the remaining power; selecting an E-TFC from a set of E-TFCs remaining after E-TFC restriction, wherein E-TFC selection is based on the at least one serving grant; generating a Protocol Data Unit (PDU) for transmission on the E-DCH based on the selected E-TFC; and transmitting the PDU according to the identified H-ARQ process.

The present invention also provides a wireless transmit/receive unit (WTRU) including an enhanced uplink medium access control (MAC-E) entity for controlling enhanced dedicated channel (E-DCH) transmissions, the WTRU comprising: circuitry configured to receive a plurality of primary absolute grants; circuitry configured to process at least one primary absolute grant of the plurality of primary absolute grants to calculate at least one serving grant for an E-DCH transmission at the upcoming TTI; circuitry configured to identify a hybrid automatic repeat request (H-ARQ) procedure for use for the upcoming TTI; circuitry configured to determine whether an identified H-ARQ process for use for the upcoming TTI is an active H-ARQ process, wherein only active H-ARQ processes are used for scheduling transmission of data and non-active H-ARQ processes are not used for scheduling transmission of data; circuitry configured to determine whether scheduling data is available for transmission in the upcoming TTI; in the case that scheduling data is available for transmission and the identified H-ARQ process is an active H-ARQ process and available for transmission of the scheduling data in the upcoming TTI: the WTRU further comprises: circuitry configured to calculate a remaining power available for the upcoming TTI based on a maximum allowed power; circuitry configured to perform E-DCH transport format combination (E-TFC) restriction based on the remaining power; circuitry configured to select an E-TFC from a set of E-TFCs remaining after E-TFC restriction, wherein E-TFC selection is based on the at least one serving grant; circuitry configured to generate a MAC-E Protocol Data Unit (PDU) for transmission on the E-DCH according to the selected E-TFC; and circuitry configured to transmit the PDU in accordance with the identified H-ARQ process.

Drawings

FIG. 1 is a block diagram of a wireless communication system configured in accordance with the present invention;

figure 2 is a block diagram of a protocol architecture of a WTRU configured in accordance with the present invention;

figure 3 is a block diagram of a MAC-e/es entity of a WTRU configured in accordance with the present invention; and

figure 4 is a flow chart of a procedure for controlling E-DCH transmissions performed in accordance with the present invention.

Detailed Description

When referred to hereafter, the terminology "wireless transmit/receive unit (WTRU)" includes but is not limited to a User Equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, or any other type of device capable of operating in a wireless environment. When referring to the technical term "node B," the term "node B" shall include, but not be limited to, a base station, a site controller, an Access Point (AP), or any other type of wireless environment interface device.

The present invention is applicable to any wireless communication system including, but not limited to, Universal Mobile Telecommunications System (UMTS) Frequency Division Duplex (FDD), UMTS Time Division Duplex (TDD), and time division synchronous code division multiple access (TD-SCDMA) systems.

The features of the present invention may be integrated into an Integrated Circuit (IC) or may be configured on a circuit comprising a multitude of interconnecting components.

Fig. 1 is a block diagram of a wireless communication system 100 configured in accordance with the present invention. The system 100 includes a WTRU 102, a node B104, and an RNC 106. The RNC 106 controls overall E-DCH operation by configuring E-DCH parameters, such as initial transmit power, maximum allowed transmit power, or effective channel resources per node B, for the node B104 and the WTRU 102. Between the WTRU 102 and the node-B104, an E-DCH 108, an E-DCH dedicated physical control channel (E-DPCCH), an absolute grant channel (E-AGCH) 112, a relative grant channel (E-RGCH) 114, and an H-ARQ information channel (E-HICH) 116 are established to support E-DCH operations.

For E-DCH transmissions, the WTRU 102 sends scheduling information (also referred to as rate requests) to the node-B104 via the E-DPCCH 110. The node-B104 sends scheduling grants to the WTRU 102 via either the E-AGCH 112 or the E-RGCH 114. After allocating E-DCH radio resources to the WTRU 102, the WTRU 102 transmits UL data via the E-DCH 108. The node B104 sends an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) for H-ARQ operations in response to the E-DCH transmission via the E-HICH 116. The node-B104 may also respond to the E-DCH data transmission in response to a rate grant to the WTRU 102.

Figure 2 is a block diagram of a protocol architecture of the WTRU 102 in accordance with the present invention. The WTRU 102 includes a higher layer 202, a Radio Link Control (RLC) layer 204, a MAC layer 206, and a physical layer 208. The MAC layer 206 includes a dedicated channel medium access control (MAC-d) entity 210 and a MAC-e/es entity 212. The MAC-E/es entity 212 handles all functions related to E-DCH transmission and reception including, but not limited to, H-ARQ transmission and retransmission, data priority, MAC-d and MAC-es multiplexing, and E-TFC selection. The RLC layer 204 is for in-sequence delivery of data, and a reordering function is provided in the RLC layer 204 to organize received data blocks according to a sequence.

Fig. 3 is a block diagram of a MAC-e/es entity 212 according to the present invention. The MAC-E/es entity 212 includes an E-TFC selection entity 302, a multiplexing and Transmission Sequence Number (TSN) setting entity 304, an H-ARQ entity 306, a serving grant processing entity 308, and a memory 310. The serving grant processing entity 308 receives the AG312 and RG 314 from the physical layer 208 and processes the AG312 and the RG 314 to generate serving grants or to store them in the memory 310, and there may be more than one RG 314. The E-TFC selection entity 302 selects an E-TFC according to the serving grant and performs arbitration among the different data streams mapped to the E-DCH.

The multiplexing and TSN setting entity 304 concatenates multiple MAC-d PDUs into a MAC-es PDU and multiplexes one or more MAC-es PDUs into a single MAC-E PDU for transmission in the next TTI as indicated by the E-TFC selection entity 302. The multiplexing and TSN setting entity 304 also manages and sets the TSN per logical channel of each MAC-es PDU.

The H-AQR entity 306 controls a plurality of H-ARQ processes for storing MAC-E PDUs and retransmits the MAC-E PDUs when a transmission failure is signaled via the E-HIGH. Scheduled data is transmitted using an active H-ARQ process, whereas an inactive H-ARQ process is not used to transmit scheduled data. The H-ARQ entity 306 identifies the H-ARQ process that should be transmitted in a given TTI. During a new transmission, the H-ARQ entity 306 provides H-ARQ profiles to all new MAC-e PAU transmissions and retransmissions. The H-ARQ profile information includes the maximum amount of transmission and its power offset to configure the physical layer.

The E-TFC selection performed by the E-TFC entity 302 is related to the availability of data mapped to the E-DCH with grant (including the occurrence of scheduling information rate request trigger) and the availability of H-ARQ procedures. The H-ARQ procedure should be available before the E-TFC selection entity 302 performs the E-TFC selection. The H-ARQ entity 306 identifies the availability of the H-ARQ process to the E-TFC selection entity. The H-ARQ process may be used immediately after initial configuration, ACK reception, or exceeding the maximum retransmission amount for any H-ARQ process.

Figure 4 is a flow diagram of a process 400 performed to control E-DCH transmissions in accordance with the present invention. A physical layer receives scheduling grants via the E-AGCH 112 and the E-RGCH 114 (step 402). After decoding the E-AGCH and E-RGCH, the AG312 and RG 314 are sent to the serving grant processing entity 308 in the MAC-E/es entity 212. The serving grant processing entity 308 processes the AG312 and RG 314 to determine a serving grant. The scheduling grant may be an AG312 from the serving E-DCH cell, or an RG 314 from all cells in the serving E-DCH Radio Link Set (RLS), or a non-serving Radio Link (RL). The scheduling grant is for a specific Transmission Time Interval (TTI), which is implicit according to the timing of the AG312 and the RG 314.

After receiving the scheduling grant, the serving grant processing entity 308 has two options immediately when there is no data transmission corresponding to the scheduling grant in the TTI. The serving grant processing entity 308 may process the received scheduling grant to determine a current serving grant for each TTI (step 404). Alternatively, the serving grant processing entity 308 may store the received scheduling grant in memory 310 (i.e., a scheduling list) and process the stored scheduling grant when there is E-DCH data available for transmission.

The E-TFC selection entity 302 determines whether there are any H-ARQ processes for scheduled data (i.e., active H-ARQ processes) and scheduled data available (step 406). If both the H-ARQ process for scheduled data and the scheduled data are available, the process 400 proceeds to step 410 to determine if a serving grant exists. Alternatively, if both H-ARQ processes for scheduled data and scheduled data are available, and if a second option is used (i.e., the received scheduling grant is stored in the memory 310), the serving grant processing entity 308 processes the scheduling grant stored in the memory 310 to determine a serving grant at step 408 before proceeding to the step 410.

The serving grant indicates the maximum E-DPDCH to Dedicated Physical Control Channel (DPCCH) power ratio that the WTRU is allowed to configure for the upcoming scheduled data transmission. The serving grant is updated according to the AG and the RG.

In processing the scheduling grants stored in the scheduling list, the serving grant processing entity 308 may process the last N AGs between the stored scheduling grants to generate the serving grant, where N is greater than 1.

Alternatively, the serving grant processing entity 308 may maintain only the latest primary AG and the subsequent RG, including the latest secondary AG in the grant list. The primary AG is an AG that receives a primary Radio Network Temporary Id (RNTI), and the secondary AG is an AG that receives a secondary RNTI. When the next transmission request scheduling grant occurs, when a new primary AG receives the previous AG, except for the last AG, it is removed from the grant list, which reduces the significant processing burden following the transmission idle period.

In addition, whenever a serving cell change occurs, the serving grant processing entity 308 discards all AG and RG stored in the grant list, which is equivalent to setting AG to zero and discarding all RGs.

If no serving grant is determined (i.e., the current serving grant is zero), step 410, the E-TFC selection entity 302 limits the E-TFC to the minimum set of E-TFCs (step 412) and calculates the remaining power based on the minimum set of E-TFCs (step 414). If it is determined at step 410 that a serving grant exists, the E-TFC selection entity 302 calculates the remaining power based on the maximum allowed power (step 414).

After calculating the remaining power, the E-TFC selection entity 302 limits the E-TFC for the TTI according to the maintained power (step 416). The E-TFC selection entity 302 then selects an E-TFC, and the multiplexing and TSN setting entity 304 generates a MAC-E PDU by multiplexing the MAC-d stream and the MAC-es PDU (step 418). A happy bit is then set for transmission in this TTI to indicate whether the WTRU satisfies the current scheduling grant (step 420), and the MAC-e/es entity waits for the next TTI (step 422).

If it is determined in step 406 that the H-ARQ process for scheduled data (i.e., the active H-ARQ process) is not present or that scheduled data is not present, the E-TFC selection entity 302 then determines whether both the H-ARQ process for non-scheduled data and the non-scheduled data are present (step 424). If both H-ARQ processes for non-scheduled data and the non-scheduled data are present, the E-TFC selection entity 302 further determines whether there are any non-scheduled grants (step 426). The non-scheduling grant is set by the RNC according to the maximum number of non-scheduling bits that can be included in the MAC-e PDU. The WTRU allows for the transmission of non-scheduled transmissions, with an upper limit of the total number of non-scheduled grants if multiplexed in the same TTI. If there is an unscheduled grant, the process proceeds to step 414 to calculate the remaining power and the subsequent MAC-e function (i.e., step 416-422), which is performed as described above.

If it is determined at step 426 that no unscheduled grants exist, a determination is made as to whether any H-ARQ processes are available (step 428). If there are H-ARQ procedures available, a determination is made as to whether scheduling information needs to be reported (i.e., whether a triggering event has occurred) (step 430).

The reporting schedule information may be triggered by a number of different events, all of which may be configurable. The generation of scheduling information is well known to those skilled in the art and is not within the scope of the present invention. If it is determined in step 430 that there is scheduling information that must be transmitted, scheduling information bits are generated (step 432) and the process proceeds to step 414 to calculate the remaining power. The subsequent MAC-e function (i.e., step 416-422) is then performed as described above. If no scheduling information needs to be transmitted, there is no new transmission in this TTI and the MAC-e entity waits for the next TTI (step 422).

If it is determined at step 428 that no H-ARQ process is available, (which means that the transmission in this TTI is a retransmission), a happy bit (happy bit) is set for the transmission in this TTI to indicate whether the WTRU satisfies the scheduling grant (step 434) and the MAC-e entity waits for the next TTI (step 422).

Examples

1. A method of controlling E-DCH transmissions.

2. The method of embodiment 1, comprising the steps of: a scheduling grant is received.

3. The method of embodiment 2, comprising the steps of: the scheduling grant is processed to calculate a service grant.

4. The method of any of embodiments 1-3, comprising the steps of: it is determined whether an H-ARQ process for scheduled data and the scheduled data are available, and if so, it is determined whether a serving grant exists.

5. The method of any of embodiments 1-4, comprising the steps of: the remaining power is calculated from the maximum allowed power.

6. The method of embodiment 5, comprising the steps of: and limiting the E-TFC according to the residual power.

7. The method of any of embodiments 1-6, comprising the steps of: an E-TFC is selected and PDUs are generated for transmission on the E-DCH.

8. The method as in any embodiments 2-7, wherein the received scheduling grant is processed for each of a plurality of TTIs.

9. The method as in any embodiments 2-7, wherein the received scheduling grant is stored in a grant list when there is no data transmission for the scheduling grant in the TTI.

10. The method of embodiment 9 wherein only the last N absolute grants are stored in the grant list and the serving grant is calculated based on the last N absolute grants.

11. The method of embodiment 9 wherein only the most recent primary absolute grant and subsequent relative grants including the last secondary absolute grant are stored in the grant list to calculate the serving grant.

12. The method of embodiment 11 wherein when a new primary absolute grant is received, the previous absolute grant and relative grant are removed from the grant list when the next transmission requests a scheduling grant, except for the last secondary absolute grant.

13. The method as in any one of embodiments 9-12, wherein when a serving cell change occurs, all scheduling grants stored in the grant list are discarded.

14. The method as in any one of embodiments 7-13 wherein the E-TFC is limited to a minimum E-TFC set if there is no serving grant.

15. The method as in any one of embodiments 4-14, further comprising the step of: if it is determined that there is no H-ARQ process for scheduled data or the scheduled data is available, it is determined whether there is an H-ARQ process for non-scheduled data and non-scheduled data available, and if so, it is determined whether there is a non-scheduled grant.

16. The method of embodiment 15, further comprising the steps of: if there is an unscheduled grant, the step of calculating the remaining power based on the maximum allowed power is performed.

17. The method as in any one of embodiments 15-16, further comprising the steps of: if it is determined that there are no H-ARQ processes for the non-scheduled data or that the non-scheduled data is available, a determination is made as to whether any H-ARQ processes are available.

18. The method of embodiment 17, further comprising the steps of: if there are available H-ARQ procedures, a determination is made as to whether a triggering event occurs to report scheduling information.

19. The method of embodiment 18, further comprising the steps of: if the trigger event occurs, scheduling information bits are generated and the step of calculating the remaining power from the maximum allowed power is performed.

20. The method as in any one of embodiments 18-19, further comprising the step of: if the triggering event has not occurred, then wait for the next TTI.

21. The method as in any one of embodiments 17-20, further comprising the step of: if it is determined that no H-ARQ procedure is available, a happy bit (happy bit) for transmission is set in this TTI.

22. The method as in any one of embodiments 15-21, further comprising the step of: if it is determined that there is no non-scheduled grant, it is determined whether there are any available H-ARQ processes.

23. The method of embodiment 22, further comprising the step of: if there are available H-ARQ procedures, a determination is made as to whether a triggering event occurs to report scheduling information.

24. The method of embodiment 23, further comprising the steps of: if the trigger event occurs, scheduling information bits are generated and the step of calculating the remaining power from the maximum allowed power is performed.

25. The method of embodiment 24, further comprising the steps of: if the triggering event has not occurred, then wait for the next TTI.

26. The method as in any one of embodiments 22-25, further comprising the step of: if it is determined that no H-ARQ procedure is available, a happy bit (happy bit) for transmission is set in this TTI.

27. A MAC-E entity in the WTRU for controlling E-DCH transmissions in a wireless communication system including a node-B, wherein the WTRU is configured with an E-DCH for uplink transmissions.

28. The MAC-e of embodiment 27 comprising a serving grant processing entity configured to receive a scheduling grant and process the scheduling grant to calculate a serving grant.

29. The MAC-E as in any embodiments 27-28, comprising an E-TFC selection entity configured to calculate a remaining power based on a maximum allowed power, to limit an E-TFC based on the remaining power, and to select the E-TFC.

30. The MAC-e as in any embodiments 27-29, comprising a multiplexing and TSN setting entity configured to generate the MAC-e PDU.

31. A MAC-e entity as in any of embodiments 27-30, comprising an H-ARQ entity configured to control a plurality of H-ARQ processes to transmit a MAC-e PDU via one of the H-ARQ processes.

32. The MAC-e as in any embodiments 28-31, wherein the serving grant processing entity processes the received scheduling grant in each of a plurality of TTIs.

33. The MAC-e as in any embodiments 28-31, wherein the serving grant processing entity stores the received scheduling grant in a grant list when there is no data transmission for the scheduling grant in a TTI.

34. The MAC-e as in embodiment 33, wherein the serving grant processing entity uses only the last N absolute grants stored in the grant list to calculate the serving grant.

35. The MAC-e as in embodiment 33, wherein the serving grant processing entity uses only the most recent primary absolute grant stored in the grant list and subsequent relative grants including the last secondary absolute grant to calculate the serving grant.

36. The MAC-e as in embodiment 35, wherein the serving grant processing entity removes previous absolute grants and relative grants from the grant list except for a last secondary absolute grant when a new primary absolute grant is received and a next transmission request scheduling grant is received.

37. The MAC-e as in any embodiments 33-36, wherein the serving grant processing entity discards all scheduling grants stored in the grant list when a serving cell change occurs.

38. The MAC-E as in any embodiments 29-37, wherein the E-TFC selection entity is configured to check the serving grant, whereby if there is no serving grant, the E-TFC selection entity restricts the E-TFC to a minimum E-TFC set before calculating the remaining power.

39. The MAC-e as in any embodiments 28-38, wherein the serving grant processing entity is configured to calculate the serving grant when there is H-ARQ scheduled data available and scheduled data available.

40. The MAC-e as in any embodiments 29-39, wherein when there is no H-ARQ process for the scheduled data, no scheduled data, and a non-scheduled grant, the serving grant processing entity is configured to calculate the remaining power available for transmission in the next TTI.

41. The MAC-E as in any embodiments 29-40, wherein if there is an H-ARQ process available and a triggering event occurs to report scheduling information, the E-TFC selection entity is configured to calculate the remaining power that can be transmitted in the next TTI.

Although the features and elements of the present invention are described in the 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. While the invention has been described in terms of preferred embodiments, it will be apparent to those skilled in the art that variations may be made without departing from the scope of the invention as claimed.

Claims (29)

1. A method implemented in a wireless transmit/receive unit (WTRU) for controlling enhanced dedicated channel (E-DCH) transmissions, the method comprising:

receiving a plurality of primary absolute grants for E-DCH transmissions at an upcoming Transmission Time Interval (TTI);

processing at least one of the plurality of primary absolute grants to calculate at least one serving grant for an E-DCH transmission;

identifying a hybrid automatic repeat request (H-ARQ) procedure for use for the upcoming TTI;

determining whether the identified H-ARQ process for use for the upcoming TTI is an active H-ARQ process, wherein only active H-ARQ processes are used for scheduling transmission of data and non-active H-ARQ processes are not used for scheduling transmission of data;

determining whether scheduling data is available for transmission in the upcoming TTI;

in the case that scheduling data is available for transmission and the identified H-ARQ process is an active H-ARQ process and available for transmission of the scheduling data in the upcoming TTI:

calculating a remaining power available for the upcoming TTI based on the maximum allowed power of the WTRU;

performing E-DCH transport format combination (E-TFC) restriction according to the remaining power;

selecting an E-TFC from a set of E-TFCs remaining after E-TFC restriction, wherein E-TFC selection is based on the at least one serving grant;

generating a Protocol Data Unit (PDU) for transmission on the E-DCH based on the selected E-TFC; and

transmitting the PDU according to the identified H-ARQ process.

2. The method of claim 1, wherein the at least one of the plurality of primary absolute grants is processed in each of a plurality of TTIs.

3. The method of claim 1, wherein the at least one primary absolute grant of the plurality of primary absolute grants is stored in a grant list if no data associated with the at least one primary absolute grant is to be transmitted in a TTI.

4. The method of claim 3, wherein, in case a new primary absolute grant is received, a previous absolute grant other than a last secondary absolute grant is removed from the grant list in case a next transmission requiring a primary absolute grant occurs.

5. The method of claim 3, wherein all primary absolute grants stored in the grant list are discarded in the event of a serving cell change.

6. The method of claim 1, further comprising:

in the event that non-scheduled data is available for transmission in the upcoming TTI and the identified H-ARQ process is a non-active H-ARQ process:

it is determined whether an unscheduled grant exists.

7. The method of claim 6, further comprising:

in the presence of the non-scheduled grant:

performing E-TFC restriction;

selecting an E-TFC based on the E-TFC restriction;

generating PDUs according to the selected E-TFC for transmission on the E-DCH; and

transmitting the PDU according to the identified H-ARQ process.

8. The method of claim 1, further comprising:

setting a happy bit for transmission in the upcoming TTI to indicate whether a current serving grant satisfies the WTRU.

9. The method of claim 6, further comprising:

determining whether a trigger event to report scheduling information occurs;

generating scheduling information bits in case of the occurrence of the triggering event; and

waiting for a next TTI in the event that the triggering event does not occur.

10. The method of claim 1, further comprising:

in the event of a triggering event to report scheduling information, scheduling information bits are generated.

11. The method of claim 1, wherein the PDU is an enhanced uplink medium access control (MAC-e) PDU.

12. The method of claim 1, wherein the at least one primary absolute grant is received from a node B.

13. The method of claim 1, wherein the at least one primary absolute grant is received on an enhanced dedicated channel absolute grant channel (E-AGCH).

14. The method of claim 1, wherein the upcoming TTI is a next TTI after a current TTI.

15. The method of claim 1, further comprising:

receiving a secondary absolute grant for an E-DCH transmission in the upcoming TTI.

16. A wireless transmit/receive unit (WTRU) including an enhanced uplink medium access control (MAC-E) entity for controlling enhanced dedicated channel (E-DCH) transmissions, the WTRU comprising:

circuitry configured to receive a plurality of primary absolute grants;

circuitry configured to process at least one primary absolute grant of the plurality of primary absolute grants to calculate at least one serving grant for an E-DCH transmission at the upcoming TTI;

circuitry configured to identify a hybrid automatic repeat request (H-ARQ) procedure for use for the upcoming TTI;

circuitry configured to determine whether an identified H-ARQ process for use for the upcoming TTI is an active H-ARQ process, wherein only active H-ARQ processes are used for scheduling transmission of data and non-active H-ARQ processes are not used for scheduling transmission of data;

circuitry configured to determine whether scheduling data is available for transmission in the upcoming TTI;

in the case that scheduling data is available for transmission and the identified H-ARQ process is an active H-ARQ process and available for transmission of the scheduling data in the upcoming TTI:

the WTRU further comprises:

circuitry configured to calculate a remaining power available for the upcoming TTI based on a maximum allowed power;

circuitry configured to perform E-DCH transport format combination (E-TFC) restriction based on the remaining power;

circuitry configured to select an E-TFC from a set of E-TFCs remaining after E-TFC restriction, wherein E-TFC selection is based on the at least one serving grant;

circuitry configured to generate a MAC-E Protocol Data Unit (PDU) for transmission on the E-DCH according to the selected E-TFC; and

circuitry configured to transmit the PDU according to the identified H-ARQ process.

17. The WTRU of claim 16, wherein the at least one of the plurality of primary absolute grants is processed in each of a plurality of TTIs.

18. The WTRU of claim 16, wherein the at least one primary absolute grant of the plurality of primary absolute grants is stored in a grant list on a condition that no data associated with the at least one primary absolute grant is to be transmitted in a TTI.

19. The WTRU of claim 18 wherein on a condition that a new primary absolute grant is received and a next transmission requiring a primary absolute grant occurs, previous absolute grants except a last secondary absolute grant are removed from the grant list.

20. The WTRU of claim 18 wherein all primary absolute grants stored in the grant list are discarded on a serving cell change condition.

21. The WTRU of claim 16, further comprising:

circuitry configured to determine whether an unscheduled grant exists if unscheduled data is available for transmission in the upcoming TTI and the identified H-ARQ process is an inactive H-ARQ process.

22. The WTRU of claim 21, further comprising:

circuitry configured to perform E-TFC restriction in the presence of the non-scheduled grant, select an E-TFC based on the E-TFC restriction, generate a PDU for transmission on an E-DCH according to the selected E-TFC, and transmit the PDU according to the identified H-ARQ procedure.

23. The WTRU of claim 16, further comprising:

circuitry configured to set a happy bit of a transmission in the upcoming TTI to indicate whether a current serving grant satisfies the WTRU.

24. The WTRU of claim 16 further configured to generate a scheduling information bit on a condition that a triggering event to report scheduling information occurs.

25. The WTRU of claim 16 wherein the at least one primary absolute grant is received from a node B.

26. The WTRU of claim 16 wherein the at least one primary absolute grant is received on an enhanced dedicated channel absolute grant channel (E-AGCH).

27. The WTRU of claim 16, wherein the upcoming TTI is a next TTI after a current TTI.

28. The WTRU of claim 16, further comprising:

circuitry configured to determine whether a triggering event to report scheduling information occurred;

the circuitry is further configured to generate a scheduling information bit if the triggering event occurs; and

the circuitry is also configured to wait for a next TTI if the triggering event does not occur.

29. The WTRU of claim 16, further comprising:

circuitry configured to receive a secondary absolute grant for an E-DCH transmission at the upcoming TTI.