MXPA06007741A - Transport format combination selection in a wireless transmit/receive unit - Google Patents

Abstract

A method for selecting a transport format combination (TFC) in a wireless transmit/receive unit (WTRU) is disclosed. The WTRU is configured to process more than one coded composite transport channel (CCTrCH) for uplink transmission. The WTRU estimates a transmit power for each of a plurality of available TFCs and selects a TFC for each CCTrCH such that the sum of the estimated WTRU transmit power for selected TFCs is within a maximum WTRU transmit power.

Description

European (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FT, For two-letler codes and other abbreviations, refer to the "Guid- FR, GB, GR, HU, IE, IS , IT, LT, LU, MC, NL, PL, PT, RO, anee Notes on Codes and Abbreviations "appearing ai the begin- SE, SI, SK, TR), OAPI (BF, BJ, CF, CG, CI, CM , GA, GN, no regular issue of the PCT Gazette, GQ, GW, ML, MR, NE, SN, TD, TG). Published: - without intemalional search report and to be republished upon receipt ofthat report SELECTION OF COMBINATION OF TRANSPORTATION FORMAT IN A WIRELESS TRANSMISSION / RECEPTION UNIT FIELD OF THE INVENTION The present invention relates to a wireless communication system. More particularly, the present invention relates to the selection of a transport format combination (TFC) in wireless transmission / reception units (WTRUs).

BACKGROUND In accordance with the current standards of the Third Generation Joint Project (3GPP), it is necessary for a WTRU to calculate the transmission power for each TFC. When a certain TFC requires more transmission power than the maximum allowed WTRU transmission power, the WTRU must limit the use of that TFC. The WTRU continually evaluates which TFCs can be used for transmission. The evaluation is carried out using the estimated transmission power of the WTRU of a given TFC. When any TFC is restricted by exceeding a transmission power limit, the medium access control (MAC) entity in the WTRU notifies a higher layer that reduces the data rate, if applicable. According to the current 3GPP standards, a WTRU has only one coded composite transport channel (CCTrCH) in the uplink transmission. Therefore, the transmission power of the WTRU is the transmission power of the CCTrCH, which is determined through the TFC used for the CCTrCH. In order to improve uplink coverage, throughput and transmission latency for uplink transmissions, the enhanced uplink (EU) in the 3GPP is currently being investigated. With the implementation of the EU, a WTRU may have more than one CCTrCH in the uplink transmissions; one for the regular dedicated channel (DCH) and another for the enhanced dedicated channel of the EU (E-DCH). In this case, the transmission power of the WTRU will be the sum of the transmission power of two CCTrCHs. The transmission power of the WTRU is determined jointly by the TFCs of two CCTrCHs. The combination of the TFC used by the dedicated CCTrCH and the TFC used by the EU CCTrCH is defined as the pair of TFCs of the WTRU whose transmission power is jointly determined by the TFCs of two CCTrCHs. This is not an optimal method to determine the TFCs for more than one CCTrCH. There is a need to obtain an efficient method for selecting a combination of TFCs for more than one CCTrCHs in the uplink transmission.

THE INVENTION The present invention relates to a method and apparatus for selecting a TFC in a WTRU. The WTRU is configured to process more than one CCTrCH for uplink transmission. The WTRU estimates a transmission power for each of a plurality of available TFCs and selects a TFC for each CCTrCH, such that the sum of the estimated transmission power of the WTRU for the selected TFCs is within the power of permissible maximum transmission of the WTRU. The WTRU can give priority to a particular CCTrCH, and through it the TFC for that particular CCTrCH is selected first and the TFC for the other CCTrCH is selected within the remaining remaining transmit power of the WTRU after the power required for the TFC selected in the prioritized CCTrCH is derived from the maximum allowable transmission power of the WTRU. This method allows you to prioritize the transmission of mapped channels to, the first CCTrCH on channels mapped to the other CCTrCH. Alternatively, the WTRU can reserve a minimum set of TFCs for the other CCTrCH, and through it a TFC for the prioritized CCTrCH is first selected within the maximum allowable transmission power of the WTRU minus the power required to support a minimum set of TFCs in the other CCTrCH. Then, the TFC for the other CCTrCH is selected within the remaining transmission power of the WTRU, after the power required for the selected TFC in the prioritized CCTrCH is deducted from the maximum allowable transmission power of the WTRU. This method allows prioritizing the transmission of channels mapped to the first CCTrCH over channels mapped to the other CCTrCHs, while reserving transmission power to allow a minimum set of TFCs in the other CCTrCH to be transmitted without being affected by the transmission power limit Maximum allowed of the WTRU. Alternatively, the WTRU can be configured for an individual maximum transmit power for each of a plurality of CCTrCHs, and through it a TFC is selected for each CCTrCH within a single maximum transmit power designated for each CCTrCH. This method allows each CCTrCH to be granted a quality of service (QoS) in relation to another CCTrCH. The activity in a CCTrCH has no priority or reduces the speed of the other CCTrCH.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow diagram of a general procedure for selecting TFCs according to a first embodiment of the present invention. Figure 2 is a flow diagram of a method for selecting TFCs according to a second embodiment of the present invention. Figure 3 is a flowchart of a method for selecting TFCs according to a third embodiment of the present invention. ' Figure 4 is a flow chart of a method for selecting TFCs according to a fourth embodiment of the present invention. Figure 5 is a block diagram of an apparatus for selecting TFCs according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Hereinafter, the expression "WTRU" includes, without being limited to a user equipment, a mobile station, a fixed or mobile subscriber unit, a pager or any other type of device capable of operating in a wireless environment. The features of the present invention can be incorporated in an integrated circuit (IC) or configured in a circuit comprising a multitude of interconnected components. Hereinafter, the present invention will be described with reference to a system that supports two CCTrCHs (ie, a dedicated CCTrCH and an EU CCTrCH). However, it should be noted that the present invention is applied to a system that supports more than two CCTrCHs. Figure 1 is a flow chart of a method 100 for selecting TFCs according to a first embodiment of the present invention. The WTRU is configured to simultaneously process a dedicated CCTrCH and an EU CCTrCH in the uplink transmission. The transmission power of the WTRU is limited to a maximum allowed transmission power of the WTRU, established by the wireless communication system. At each transmission time interval (TTI), the WTRU estimates the transmission power for each of a plurality of available TFCs (step 102) for each CCTrCH. The WTRU estimates the transmission power of each TFC during a predetermined period taking into account the gain factor of each corresponding TFC. The WTRU then selects the TFCs for transmission at each CCTrCH among a plurality of available TFCs, such that the sum of the estimated transmit power of the selected TFCs for the dedicated CCTrCH and the EU CCTrCH does not exceed the transmit power allowed maximum of the WTRU (step 104). Additionally, the dedicated CCTrCH, the EU CCTrCH, or both, may possess the ability to transmit a reserved minimum set of TFCs, even when the power required for the transmission of these TFCs exceeds the maximum allowable transmission power of the WTRU. TFCs that require power greater than the maximum allowable transmission power are defined as being in a state of excess power. The minimum set is to reserve the lowest speed in a CCTrCH, thus maintaining the basic services for the channel. Since in the EU CCTrCH there exists only one TrCH, the minimum set corresponds to the lowest speed per logical channel or MAC-d flow mapped to the EU TrCH. The minimum set of TFCs can be a transport block per TTI for each channel mapped to the CCTrCH or a series of TTI transport blocks that correspond to a guaranteed bit rate (GBR). The reserved minimum set of TFCs can be transmitted in a state of excess power. In order to keep the transmission power within the maximum allowed level, a WTRU reduces the power in physical channels mapped to the dedicated CCTrCH, the EU CCTrCH or all the physical channels present. Regardless of the TFC selection, the EU CCTrGH may be provided with a set of reserved minimum TFCs which is one or more transport blocks per logical channel or MAC-d flow mapped to the EU CCTrCH. A transport block is one or more radio link control (RLC) protocol data units (PDUs). One or more transport blocks are equivalent to the data rate. The set of reserved TFCs can be transmitted in a state of excess power by reducing the power in the physical channels mapped to the EU CCTrCH, to the dedicated CCTrCH or all the UL channels present. Figure 2 is a flow chart of a method 200 for selecting TFCs according to a second embodiment of the present invention. The TFC selection of the dedicated CCTrCH is prioritized over the TFC selection of the EU CCTrCH. At each TTI of the dedicated CCTrCH, the WTRU estimates the transmit power requirement for each of a plurality of available TFCs configured for the dedicated CCTrCH (step 202). The WTRU selects a TFC for the dedicated CCTrCH first, without considering the power requirement of the EU CCTrCH (step 204). Once the TFC for the dedicated CCTrCH is selected, in each TTI of the EU CCTrCH the WTRU selects a TFC for the EU CCTrCH within the remaining transmission power of the WTRU after the power. required for the TFC selected for the dedicated CCTrCH is derived from the maximum allowable transmission power of the WTRU (step 206). The TFC selection of the dedicated CCTrCH is not affected by the operation of the EU CCTrCH, while the TFC selection of the EU CCTrCH is affected and limited by the operation of the dedicated CCTrCH. The remaining power for the CCTrCH of the EU is estimated for each TTI of the dedicated CCTrCH or each TTI of the CCTrCH of Eü. At each TTI of the EU CCTrCH, the remaining available power for the EU CCTrCH is estimated as the maximum allowable transmission power of the WTRU minus the power required by the 3rd transmission of the selected dedicated CCTrCH TFC. Alternatively, in each TTI of the dedicated CCTrCH, the remaining available power for the EU CCTrCH is estimated as the maximum allowable transmission power of the WTRU minus the power required to support the TFC transmission of the selected dedicated CCTrCH. In procedure 200, the EU CCTrCH may allow the transmission of a minimum set of TFCs, even when these TFCs are in a state of excess power. A TFC of FU is in a state of excess power when the estimated remaining power is lower than the transmission power requirement calculated for the TFC of the EU CCTrCH. The minimum set of EU reserves the lowest or guaranteed speed in channels mapped to the EU CCTrCH and, in this way, maintains the basic services for the EU channels. Since there is only one TrCH in the EU CCTrCH, the minimum set corresponds to the lowest speed per logical channel or MAC-d flow mapped to the EU TrCH. The minimum set of TFCs can be a transport block per TTI for each channel mapped to the CCTrCH or a series of transport blocks per TTI corresponding to a guaranteed bit rate.

(GBR). When a TFC is transmitted in a state of excess power, to keep the transmission power within the maximum allowed level, the WTRU reduces the power in the physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all the physical channels present . Figure 3 is a flow diagram of a method 300 for selecting TFCs according to a third embodiment of the present invention. The WTRU gives priority to the TFC selection of the dedicated CCTrCH, while reserving transmission power for a minimum set of TFCs of the EU CCTrCH (step 302). A minimum set of TFCs is defined for a CCTrCH of Eu to reserve a lower or guaranteed speed for channels mapped to the EU CCTrCH. Since there is only one TrCH in the EU CCTrCH, the minimum set corresponds to the lowest speed per logical channel or MAC-d flow mapped to the EU TrCH. The minimum set of TFCs-can be a transport block per TTI for each channel mapped to the CCTrCH or a series of transport blocks per TTI that correspond to a GBR. The EU CCTrCH can allow the transmission of a minimum set of TFCs, even when these TFCs are in a state of excess power. An EU TFC is in a state of excess power when the estimated remaining power is less than the transmission power requirement calculated for the US TFC. When a TFC is transmitted in a state of excess power, to keep the transmission power within the maximum allowed level, a WTRU reduces the power in the physical channels mapped to the EU CCTrCH, to the dedicated CCTrCH ', or all the physical channels present When a TFC is in a state of excess power (with lower power), the quality of the transmission decreases (ie, smaller SIR, higher BLER, etc.). This can frustrate the goal of maintaining the minimum set. For 2? both, in order to minimize the possibility that the TFC of the EU CCTrCH must be transmitted in a state of excess power and to further ensure that the minimum set is actually supported, in the procedure 300 the transmission power reserves for the US mini-set when the TFC selection is carried out in the prioritized dedicated CCTrCH. The TFC selection of the dedicated CCTrCH is prioritized over the TFC selection of the EU CCTrCH. At each TTI of the dedicated CCTrCH, the WTRU estimates the transmit power for each of a plurality of available TFCs configured for the dedicated CCTrCH and the TFCs associated with the minimum set of CCTrCH of the UE (step 304). The WTRU selects a TFC for the dedicated CCTrCH that has a power requirement that does not exceed the maximum allowable transmission power minus the power required to support the minimum set of TFCs in the EU CCTrCH (step 306). Once the TFC for the dedicated CCTrCH is selected, in each TTI of the EU CCTrCH the WTRU selects a TFC for the EU CCTrCH within the remaining transmission power after the power required for the TFC selected for the dedicated CCTrCH is deduced of the maximum allowable transmission power (step 308). The remaining power for the EU CCTrCH is estimated for each .TTI of the dedicated CCTrCH or for each TTI of the EU CCTrCH. At each TIT of the EU CCTrCH, the remaining available power for the EU CCTrCH is estimated as the maximum allowable transmission power of the WTRU minus the power required by the TFC transmission of the selected dedicated CCTrCH. Alternatively, in each TTI of the dedicated CCTrCH, the remaining available power for the EU CCTrCH is estimated as the maximum allowable transmission power of the WTRU minus the power required to support the TFC transmission of the selected dedicated CCTrCH. Since the selection of the dedicated CCTrCH TFC has priority over the EU CCTrCH, and the power requirement may change during the dedicated TTI, the minimum set of TFCs of the EU CCTrCH can still be transmitted in a state of excess power, although the power has been reserved when the dedicated TFC selected phase. In this situation, in order to keep the transmission power within a maximum allowed level, the WTRU reduces all the physical channels mapped to the EU CCTrCH, to the dedicated CCTrCH, or todcjs the physical channels present. Figure 4 is a flow chart of a method 400 for selecting TFCs according to a fourth embodiment of the present invention. The WTRU establishes a maximum individual transmission power, or a relative ratio to the maximum allowed transmission power of the WTRU, for a dedicated CCTrCH and an EU CCTrCH (step 402). The maximum power level (or ratio) for each CCTrCH is a configurable parameter. The factors for determining the maximum power level (or the relationship) for each CCTrCH can include, but are not limited to, a data rate of each CCTrCH, the quality of service (QoS) of each CCTrCH and a relative priority between CCTrCHs. At each TTI of the dedicated CCTrCH and each TTI of the EU CCTrCH, the WTRU estimates the transmission power for each of a plurality of available TFCs (step 404). The WTRU then selects a TFC for each CCTrCH within the individual peak transmission power of each CCTrCH (step 406). The TFC selection process for each CCTrCH operates independently. The TFC of each CCTrCH is selected only from those TFCs that can be supported by the individual maximum power level determined for a particular CCTrCH. The dedicated CCTrCH, the EU CCTrCH, or both, may be provided with an ability to transmit a minimum set of TFCs. The minimum set is to reserve the lowest speed for each channel mapped to the CCTrCH, thus maintaining the basic services for each channel. Since there is only one TrCH in the EU CCTrCH, the minimum set corresponds to the lowest speed per logical channel or MAC-d flow mapped to the EU TrCH. The minimum set of TFCs can be a transport block per TTI for each channel mapped to the CCTrCH or a series of transport blocks per TTI that correspond to a GBR. The minimum set of TFCs can be transmitted in a state of excess power. In this situation, to keep the transmission power within the maximum allowed level, the WTRU reduces all the physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all the physical channels present. Figure 5 is a block diagram of an apparatus 500 for selecting TFCs according to the present invention. The apparatus comprises a transmission power estimation unit 502, a TFC selection unit 504 and a measurement unit 506. The transmission power estimation unit 502 calculates an estimate of the transmission power for each of a plurality of available TFCs. The TFC selection unit 504 selects a TFC for each CCTrCH, such that the sum of the estimated transmission power of the WTRU for the selected TFCs is within a maximum transmission power of the WTRU. The measuring unit 506 performs physical measurements of the transmission power of the WTRU for a predetermined period, and the transmission power estimation unit 502 calculates an estimate of a transmission power of each TFC using the measurement results and a gain factor of the corresponding TFC. While 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 features. elements of the present invention.

Claims (54)

1. lß CLAIMS 1. Method for selecting a transport format combination (TFC) in a wireless transmit / receive unit (WTRU), the WTRU is configured to process more than one coded composite transport channel (CCTrCH) for uplink transmission , and the method is characterized in that it comprises: estimating a power? e transmission for each of a plurality of available TFC's; and selecting a TFC for each CCTrCH such that the sum of the estimated transmission power of the WTRU for the selected TFCs is within a maximum allowable transmission power of the WTRU. Method according to claim 1, characterized in that a selection of a TFC for a particular CCTrCH has a priority with respect to another CCTrCH, μ through which the TFC for the prioritized CCTrCH is selected first independently and a TFC for another CCTrCH is selected within the remaining transmission power of the WTRU, after selecting the TFC for the prioritized CCTrCH. "'* 3. Method according to claim 2, characterized in that during the period of each transmitted time interval (TTI) of the prioritized CCTrCH, one or more TTIs can exist for the other CCTrCH. Method according to claim 2, characterized in that a TFC is selected for each transmission time interval (TTI) of the prioritized CCTrCH and a TFC is selected for each TTI of the other CCTrCH. Method according to claim 2, characterized in that the prioritized CCTrCH is a dedicated channel (DCH) and the other CCTrCH is an enhanced uplink (EU) channel. , 6. Method according to claim 5, characterized in that the remaining transmission power of the WTRU is calculated in each transmission time interval (TTI) of the EU channel. Method according to claim 5, characterized in that the remaining transmission power of the WTRU is calculated in each transmission time interval (TTI) of the dedicated channel. Method according to claim 2, characterized in that a minimum set of TFCs is reserved for at least one CCTrCH, through which the CCTrCH always has a possibility to transmit the minimum set of TFCs even when the minimum set of TFCs is in the state of excess power. Method according to claim 8, further characterized in that it comprises the step of reducing the physical channels in at least one CCTrCH when the transmission power of at least one CCTrCH is in a state of excess power. 10. Method according to claim%, characterized in that the minimum set of reserved TFCs is a protocol data unit (PDU) per media access control (MAC) -d flow or logical channel per transmission time interval. Method according to claim 8, characterized in that the minimum set of reserved TFCs is one or more protocol data units corresponding to a bit rate guaranteed by medium access control (MAC) flow-two logical channel by transmission time interval. 12. Method according to claim 1, further characterized in that it comprises the step of: establishing a maximum allowable individual transmission power pa ?; > to each of a plurality of CCTrCHs, through which a TFC for each CCTrCH is selected within the individual allowable maximum transmit power designated for each CCTrCH. Method according to claim 12, characterized in that the individual maximum transmission power is determined by at least one of a data rate, quality of service and relative priority between CCTrCHs. Method according to claim 12, characterized in that the minimum set of TFCs is reserved for each CCTrCH, through which each CCTrCH always has the possibility of transmitting the minimum set of TFCs, even when the minimum set of TFCs is in a state of excess power. 15. Method according to claim 14, further characterized in that it comprises a step of reducing the physical channels in each CCTrCH when a power of transmission of a CCTrCH is in an excess state. Method according to claim 14, characterized in that the minimum set of reserved TFCs is a protocol data unit per media access control (MAC) -d flow or logical channel per transmission time interval. Method according to claim 14, characterized in that the minimum set of reserved TFCs is one or more protocol data units corresponding to a bit rate guaranteed by medium access control (MAC) flow-two logical channel by transmission time interval. 18. Method according to claim 1, further characterized by comprising the step of: providing a priority to a particular CCTrCH, while reserving a minimum set of TFCs for the other CCTrCH, through which a TFC for the CCTrCH Prioritized is selected first within the maximum allowed transmission power of the WTRU minus the power to support the minimum set of TFCs reserved in the other CCTrCH, and one TFC for the other CCTrCH is selected within the remaining transmission power of the WTRU after selecting the TFC for the prioritized CCTrCH. Method according to claim 18, characterized in that during the period of each transmission time interval (TTI) of the prioritized CCTrCH, one or more TTIs may exist for the other CCTrCH. twenty.' Method according to claim 18, characterized in that a TFC is selected for each transmission time interval (TTI) of the prioritized CCTrCH and a TFC is selected for each TTI of the other CCTrCH. 21. Method according to claim 18, characterized in that the prioritized CCTrCH is a dedicated channel (DCH) and the other CCTrCH is an enhanced uplink (EU) channel. 22. Method according to claim 21, characterized in that a minimum set of TFC is also reserved for the dedicated CCTrCH. 23. Method according to claim 18, characterized in that the minimum set of reserved TFCs is a protocol data unit per media access control (MAC) -d flow or logical channel per transmission time slot. Method according to claim 18, characterized in that the minimum set of reserved TFCs is one or more protocol data units corresponding to a bit rate guaranteed by medium access control (MAC) flow-two logical channel by transmission time interval. Method according to claim 18, characterized in that the remaining transmission power of the WTRU is calculated in each transmission time interval of the channel EU. Method according to claim 1, characterized in that the remaining transmission power of the WTRU is calculated in each transmission time slot of the dedicated channel 27. Method according to claim 18, further characterized in that it comprises the step which consists in reducing the physical channels in at least one CCTrCH when a transmission power of at least one CCTrCH is in a state of excess power 28. Method according to claim 1, characterized in that a CCTrCH is a dedicated channel (DCH) and the other CCTrCH is an enhanced uplink (EU) channel, and the EU channel is provided with a minimum set of reserved TFCs, through which the EU channel always has the ability to transmit the minimum set of Reserved TFCs. ^ 29. Apparatus for selecting transport format combinations (TFCs) for a plurality of coded composite transport channels (CCTrCHs), the apparatus is characterized "'in that it comprises: a transmission power estimation unit for estimating a transmission power for each of a plurality of available TFCs; and a TFC selection unit to select a TFC for each CCTrCH, such that the sum of the estimated transmission power of. the wireless transmit / receive unit (WTRU) for selected TFCs is within a maximum allowable transmission power of the WTRU. 30. Apparatus according to claim 29, characterized in that the selection of a TFC for a particular CCTrCH has a priority over the other CCTrCH, whereby the TFC for the prioritized CCTrCH is selected first independently and a TFC for the other CCTrCH is selected within the remaining transmission power of the WTRU after selecting the TFC for the prioritized CCTrCH. "' 31. Apparatus according to claim 30, characterized in that during the period of each transmission time interval (TTI) of the prioritized CCTrCH, one or more TTIs can exist for the other CCTrCH. 32. Apparatus according to claim 30, characterized in that one TFC is selected for each transmission time interval (TTI) of the prioritized CCTrCH and one TFC is selected for each TTI of the other CCTrCH. 33. Apparatus according to claim 30, characterized in that the prioritized CCTrCH is a dedicated channel (DCH) and the other CCTrCH is an enhanced uplink (EU) channel. 34. Apparatus according to claim 33, characterized in that the remaining transmission power of the WTRU is calculated in each transmission time slot of the channel EU. 35. Apparatus according to claim 33, characterized in that the remaining transmission power of the WTRU is calculated in each transmission time slot of the dedicated channel. 36. Apparatus according to claim 30, characterized in that a minimum set of TFCs is reserved for each CCTrCH, through which each CCTrCH always has the possibility of transmitting the minimum set of TFCs, even when the minimum set of TFCs is in a state of excess power. 37. Apparatus according to claim 36 / further characterized in that it comprises the means of reducing the physical channels in each CCTrCH when a transmission power of at least one CCTrCH is in a state of excess power. 38. Apparatus according to claim 36 *, characterized in that the minimum set of reserved TFCs is a protocol data unit per media access control (MAC) -d flow or logical channel per transmission time slot. 39. Apparatus according to claim 36, characterized in that the minimum set of reserved TFCs is one or more protocol data units corresponding to a bit rate guaranteed by medium access control (MAC) flow-two logical channel by transmission time interval. 40. Apparatus according to claim 29, characterized in that the TFC selection unit selects one TFC for each CCTrCH within a maximum individual allowable transmission power designated for each CCTrCH. 41. Apparatus according to claim 40, characterized in that the maximum allowed individual transmission power is determined by at least one of a data rate, quality of service and relative priority between the CCTrCHs. 42. Apparatus according to claim 40, characterized in that a minimum set of TFCs is reserved for each CCTrCH, through which each CCTrCH always has the possibility of transmitting the minimum set of TFCs, even when the minimum set of TFCs is find in a state of excess power. 43. Apparatus according to claim 42, further characterized in that it comprises the means consisting of reducing the physical channels in each CCTrCH when a transmission power of a CCTrCH is in a state of excess power. > 44. Apparatus according to claim 42-, characterized in that the minimum set of reserved TFCs is a protocol data unit per media access control (MAC) -d flow or logical channel per transmission time interval. 45. Apparatus according to claim 42, characterized in that the minimum set of reserved TFCs is one or more protocol data units corresponding to a bit rate guaranteed by medium access control (MAC) flow -n logical channel. by transmission time interval. 46. Apparatus according to claim 2 ?, characterized in that the TFC selection unit provides a priority to a particular CCTrCH and reserves a minimum set of TFCs for the other CCTrCH, through which a TFC for the prioritized CCTrCH is selects first within a maximum allowable transmission power of the WTRU minus the power to support the minimum set of .TFCs and one TFC for the other CCTrCH is selected within the power \ e remaining transmission of the WTRU after selecting the TFC for the CCTrCH prioritized. 47. Apparatus according to claim 46, characterized in that the prioritized CCTrCH is a dedicated channel (DCH) and the other CCTrCH is an enhanced uplink (EU) channel. 48. Apparatus according to claim 46, characterized in that during the period of each transmission time interval (TTI) of the prioritized CCTrCH, one or more TTIs can exist for the other CCTrCH. . 49. Apparatus according to claim 46, characterized in that a TFC is selected for each transmission time interval (TTI) of the prioritized CCTrCH and a T, F, C is selected for each TTI of the other CCTrCH. 50. Apparatus according to claim 47 ', characterized in that a minimum set of TFCs is also reserved for the dedicated CCTrCH. 51. Apparatus according to claim 50, further characterized in that it comprises the means consisting of reducing the physical channels in each CCTrCH when a transmission power of at least one CCTrCH is in a state of excess power. 52. Apparatus according to claim 50, characterized in that the minimum set of reserved TFCs is a protocol data unit per medium access control (MAC) -d flow or logical channel per transmission time interval. 53. Apparatus according to claim 50, characterized in that the minimum set of reserved TFCs is one or more protocol data units corresponding to a bit rate guaranteed by medium access control (MAC) flow-two logical channel by transmission time interval. 54. Integrated circuit (IC) to select transport format combinations (TFCs) for a 'plurality of coded composite transport channels (CCTrCHs), the apparatus is characterized in that it comprises: a transmission power estimation unit for estimating a transmission power for each of a plurality of available TFCs; and a TFC selection unit for selecting a TFC for each CCTrCH where the sum of the estimated transmission power of the wireless transmission / reception unit (WTRU) for selected TFCs is within a maximum allowable transmission power of the WTRU .