US20130250892A1 - Transport format combination selection in a wireless transmit/receive unit - Google Patents

Transport format combination selection in a wireless transmit/receive unit Download PDF

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Publication number
US20130250892A1
US20130250892A1 US13/895,817 US201313895817A US2013250892A1 US 20130250892 A1 US20130250892 A1 US 20130250892A1 US 201313895817 A US201313895817 A US 201313895817A US 2013250892 A1 US2013250892 A1 US 2013250892A1
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channel
tfc
tfcs
wtru
uplink
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US13/895,817
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Guodong Zhang
Stephen E. Terry
Stephen G. Dick
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Individual
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Priority to US13/895,817 priority Critical patent/US20130250892A1/en
Publication of US20130250892A1 publication Critical patent/US20130250892A1/en
Priority to US14/511,096 priority patent/US9942878B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/226—TPC being performed according to specific parameters taking into account previous information or commands using past references to control power, e.g. look-up-table
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission during data packet transmission, e.g. high speed packet access [HSPA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
    • H04W52/60—Signalisation aspects of the TPC commands, e.g. frame structure using different transmission rates for TPC commands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention is related to a wireless communication system.
  • a WTRU Under the current Third Generation Partnership Project (3GPP) standards, a WTRU is required to estimate a transmission power for each TFC. In the case that a certain TFC would require more transmission power than the maximum allowed WTRU transmission power, the WTRU should limit the usage of that TFC.
  • 3GPP Third Generation Partnership Project
  • the WTRU continuously evaluates which TFCs can be used for transmission.
  • the evaluation is performed using the estimated WTRU transmit power of a given TFC.
  • the medium access control (MAC) entity in the WTRU notifies an upper layer to reduce the data rate, if applicable.
  • a WTRU has only one coded composite transport channel (CCTrCH) in uplink transmission. Therefore, the WTRU transmit power is the transmit power of the CCTrCH, which is determined by the TFC used for the CCTrCH.
  • CCTrCH coded composite transport channel
  • a WTRU may have more than one CCTrCH in uplink transmissions; one for the regular dedicated channel (DCH) and the other for EU enhanced dedicated channel (E-DCH).
  • the WTRU transmit power will be the sum of the transmit power of two CCTrCHs.
  • the WTRU transmit power is determined jointly by the TFCs of the two CCTrCHs.
  • the combination of the TFC used by the dedicated CCTrCH and the TFC used by the EU CCTrCH is defined as the TFC pair of the WTRU whose transmit power is determined jointly by the TFCs of the two CCTrCHs. This is not an optimal method of determining the TFCs for more than one CCTrCH.
  • a method and apparatus for selecting a TFC in a wireless transmit/receive unit is disclosed.
  • the WTRU estimates a transmit power for each of a plurality of available transport format combinations (TFCs).
  • TFCs transport format combinations
  • a TFC is selected for an uplink dedicated channel and a TFC is selected for an enhanced uplink (EU) channel.
  • the TFC for the dedicated channel is selected first and independently of the TFC selection of the EU channel.
  • the TFC for the EU channel is selected within a remaining WTRU transmit power after the TFC selection for the dedicated channel.
  • FIG. 1 is a flow diagram of a general process for selecting TFCs in accordance with a first embodiment of the present invention.
  • FIG. 2 is a flow diagram of a process for selecting TFCs in accordance with a second embodiment of the present invention.
  • FIG. 3 is a flow diagram of a process for selecting TFCs in accordance with a third embodiment of the present invention.
  • FIG. 4 is a flow diagram of a process for selecting TFCs in accordance with a fourth embodiment of the present invention.
  • FIG. 5 is a block diagram of an apparatus for selecting TFCs in accordance with the present invention.
  • WTRU includes but is not 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 may be incorporated into an integrated circuit (IC) or be configured in a circuit comprising a multitude of interconnecting components.
  • IC integrated circuit
  • the present invention will be described with reference to a system supporting two CCTrCHs, (i.e., a dedicated CCTrCH and an EU CCTrCH).
  • a dedicated CCTrCH and an EU CCTrCH i.e., a dedicated CCTrCH and an EU CCTrCH.
  • the present invention is applicable to a system supporting more than two CCTrCHs.
  • FIG. 1 is a flow diagram of a process 100 for selecting TFCs in accordance with a first embodiment of the present invention.
  • the WTRU is configured to process a dedicated CCTrCH and an EU CCTrCH simultaneously in uplink transmission.
  • the transmit power of the WTRU is limited to a maximum allowed WTRU transmit power, which is set by the wireless communication system.
  • TTI transmit time interval
  • the WTRU estimates the transmit power for each of a plurality of available TFCs (step 102 ) for each CCTrCH.
  • the WTRU estimates the transmit power of each TFC over a predetermined period taking into account the gain factor of each corresponding TFC.
  • the WTRU selects TFCs for transmission on 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 maximum allowed WTRU transmit power (step 104 ).
  • the dedicated CCTrCH, the EU CCTrCH, or both may be provided with a capability of transmitting a reserved minimum set of TFCs even when the power required for transmission of these TFCs exceeds the maximum allowed WTRU transmit power. TFCs that require power greater then the maximum allowed transmit power are defined to be in an excess power state.
  • the minimum set is for reserving a lowest rate in a CCTrCH, thereby maintaining the basic services for the channel. Since in the EU CCTrCH there is only one TrCH, the minimum set corresponds to a lowest rate per logical channel or MAC-d flow mapped to the EU TrCH.
  • the minimum set of TFCs may be one transport block per TTI for each channel mapped to the CCTrCH or a number of transport blocks per TTI corresponding to a guaranteed bit rate (GBR).
  • GBR guaranteed bit rate
  • the reserved minimum set of TFCs may be transmitted in an excess power state.
  • a WTRU scales down power on physical channels mapped to the dedicated CCTrCH, the EU CCTrCH, or all physical channels present.
  • the EU CCTrCH may be provided with a minimum reserved set of TFCs that 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).
  • RLC radio link control
  • One or more transport blocks is equivalent to a data rate.
  • the reserved set of TFCs can be transmitted in an excess power state by scaling down power on either the physical channels mapped to the EU CCTrCH, the dedicated CCTrCH or all present UL channels.
  • FIG. 2 is a flow diagram of a process 200 for selecting TFCs in accordance with a second embodiment of the present invention.
  • TFC selection of the dedicated CCTrCH is prioritized over TFC selection of the EU 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 ).
  • the WTRU selects a TFC for the EU CCTrCH within the remaining WTRU transmit power after the power required for the selected TFC for the dedicated CCTrCH is deducted from the maximum allowed WTRU transmit power (step 206 ).
  • the TFC selection of the dedicated CCTrCH is not affected by the operation of 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 EU CCTrCH is estimated either each dedicated CCTrCH TTI or each EU CCTrCH TTI.
  • the remaining power available for the EU CCTrCH is estimated as the maximum allowed WTRU transmit power minus the power required by transmission of the selected dedicated CCTrCH TFC.
  • the remaining power available for the EU CCTrCH is estimated as the maximum allowed WTRU transmit power minus the power required to support transmission of the selected dedicated CCTrCH TFC.
  • the EU CCTrCH may allow transmission of a minimum set of TFCs even when these TFCs are in excess power state.
  • An EU TFC is in excess power state when the estimated remaining power is less then the calculated transmission power requirement for the EU CCTrCH TFC.
  • the EU minimum set reserves a lowest or guaranteed rate on channels mapped to the EU CCTrCH, and thereby maintains the basic services for EU channels. Since in the EU CCTrCH there is only one TrCH, the minimum set corresponds to a lowest rate per logical channel or MAC-d flow mapped to the EU TrCH.
  • the minimum set of TFCs may be one transport block per TTI for each channel mapped to the CCTrCH or a number of transport blocks per TTI corresponding to a guaranteed bit rate (GBR).
  • GBR guaranteed bit rate
  • FIG. 3 is a flow diagram of a process 300 for selecting TFCs in accordance with a fourth embodiment of the present invention.
  • the WTRU gives priority to dedicated CCTrCH TFC selection while reserving transmit power for a minimum set of EU CCTrCH TFCs (step 302 ).
  • a minimum set of TFCs for an EU CCTrCH is defined to reserve a lowest or guaranteed rate for channels mapped to the EU CCTrCH. Since in the EU CCTrCH there is only one TrCH, the minimum set corresponds to a lowest rate per logical channel or MAC-d flow mapped to the EU TrCH.
  • the minimum set of TFCs may be one transport block per TTI for each channel mapped to the CCTrCH, or a number of transport blocks per TTI corresponding to a GBR.
  • the EU CCTrCH may allow transmission of a minimum set of TFCs even when these TFCs are in excess power state.
  • An EU TFC is in excess power state when the estimated remaining power is less then the calculated transmission power requirement for the EU TFC.
  • the WTRU scales down power on physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all physical channels present.
  • TFC selection of the dedicated CCTrCH is prioritized over TFC selection of the EU CCTrCH.
  • the WTRU estimates the transmit power for each of a plurality of available TFCs configured for the dedicated CCTrCH and TFCs associated with the EU CCTrCH minimum set (step 304 ).
  • the WTRU selects a TFC for the dedicated CCTrCH that has a power requirement that does not exceed the maximum allowed transmit power minus the power required to support the minimum set of TFCs on the EU CCTrCH (step 306 ).
  • the WTRU selects a TFC for the EU CCTrCH with the remaining transmit power after power required for the selected the TFC for the dedicated CCTrCH is deducted from the maximum allowed transmit power (step 308 ).
  • the remaining power for the EU CCTrCH is estimated either each dedicated CCTrCH TTI or each EU CCTrCH TTI.
  • the remaining power available for the EU CCTrCH is estimated as the maximum allowed WTRU transmit power minus the power required by transmission of the selected dedicated CCTrCH TFC.
  • the remaining power available for the EU CCTrCH is estimated as the maximum allowed WTRU transmit power minus the power required to support transmission of the selected dedicated CCTrCH TFC.
  • the WTRU scales down all physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all physical channels present.
  • FIG. 4 is a flow diagram of a process 400 for selecting TFCs in accordance with a third embodiment of the present invention.
  • the WTRU sets an individual maximum transmit power, or a ratio relative to the maximum allowed WTRU transmit power, for a dedicated CCTrCH and an EU CCTrCH (step 402 ).
  • the maximum power level (or the ratio) for each CCTrCH is a configurable parameter.
  • the factors for determining the maximum power level (or the ratio) for each CCTrCH may include, but are not limited to, a data rate of each CCTrCH, quality-of-service (QoS) of each CCTrCH and a relative priority between the CCTrCHs.
  • QoS quality-of-service
  • the WTRU estimates the transmit power for each of a plurality of available TFCs (step 404 ). The WTRU then selects a TFC for each CCTrCH within the individual maximum transmit power of each CCTrCH (step 406 ).
  • the TFC selection process for each CCTrCH operates independently. The TFC of each CCTrCH is selected from only 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 a capability of transmitting a minimum set of TFCs.
  • the minimum set is for reserving a lowest rate for each channel mapped to the CCTrCH, thereby maintaining the basic services for each channel. Since in the EU CCTrCH there is only one TrCH, the minimum set corresponds to a lowest rate per logical channel or MAC-d flow mapped to the EU TrCH.
  • the minimum set of TFCs may be one transport block per TTI for each channel mapped to the CCTrCH or a number of transport blocks per TTI corresponding to a GBR.
  • the minimum set of TFCs may be transmitted in an excess power state.
  • the WTRU scales down all physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all physical channels present.
  • FIG. 5 is a block diagram of an apparatus 500 for selecting TFCs in accordance with the present invention.
  • the apparatus 500 comprises a transmit power estimation unit 502 , a TFC selection unit 504 , and a measurement unit 506 .
  • the transmit power estimation unit 502 calculates an estimate of a transmit 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 WTRU transmit power for the selected TFCs is within a maximum WTRU transmit power.
  • the measurement unit 506 performs physical measurements of the WTRU transmit power over a predetermined period, and the transmit power estimation unit 502 calculates the estimate of a transmit power of each TFC using the measurement results and a gain factor of the corresponding TFC.

Abstract

A method and apparatus for selecting a TFC in a wireless transmit/receive unit (WTRU) is disclosed. The WTRU estimates a transmit power for each of a plurality of available transport format combinations (TFCs). A TFC is selected for an uplink dedicated channel and a TFC is selected for an enhanced uplink (EU) channel. The TFC for the dedicated channel is selected first and independently of the TFC selection of the EU channel. The TFC for the EU channel is selected within a remaining WTRU transmit power after the TFC selection for the dedicated channel.

Description

    CROSS REFERENCE TO RELATED APPLICATION
  • This application is a continuation of U.S. patent application Ser. No. 11/705,638 filed Feb. 12, 2007, which is a continuation of U.S. patent application Ser. No. 11/019,489 filed Dec. 22, 2004, which issued on May 8, 2007 as U.S. Pat. No. 7,215,655, which claims priority from U.S. Provisional Application No. 60/535,426 filed Jan. 9, 2004 which are incorporated by reference as if fully set forth.
    • FIELD OF INVENTION
  • The present invention is related to a wireless communication system.
    • BACKGROUND
  • Under the current Third Generation Partnership Project (3GPP) standards, a WTRU is required to estimate a transmission power for each TFC. In the case that a certain TFC would require more transmission power than the maximum allowed WTRU transmission power, the WTRU should limit the usage of that TFC.
  • The WTRU continuously evaluates which TFCs can be used for transmission. The evaluation is performed using the estimated WTRU transmit power of a given TFC. When any TFC is restricted for exceeding a transmit power limit, the medium access control (MAC) entity in the WTRU notifies an upper layer to reduce the data rate, if applicable.
  • Under the current 3GPP standards, a WTRU has only one coded composite transport channel (CCTrCH) in uplink transmission. Therefore, the WTRU transmit power is the transmit power of the CCTrCH, which is determined by the TFC used for the CCTrCH.
  • In order to improve uplink coverage, throughput and transmission latency for uplink transmissions, enhanced uplink (EU) is currently being investigated in 3GPP. With EU implementation, a WTRU may have more than one CCTrCH in uplink transmissions; one for the regular dedicated channel (DCH) and the other for EU enhanced dedicated channel (E-DCH). In this case, the WTRU transmit power will be the sum of the transmit power of two CCTrCHs.
  • The WTRU transmit power is determined jointly by the TFCs of the two CCTrCHs. The combination of the TFC used by the dedicated CCTrCH and the TFC used by the EU CCTrCH is defined as the TFC pair of the WTRU whose transmit power is determined jointly by the TFCs of the two CCTrCHs. This is not an optimal method of determining the TFCs for more than one CCTrCH.
  • There is a need for an efficient method for selecting a combination of TFCs for more than one CCTrCHs in uplink transmission.
    • SUMMARY
  • A method and apparatus for selecting a TFC in a wireless transmit/receive unit (WTRU) is disclosed. The WTRU estimates a transmit power for each of a plurality of available transport format combinations (TFCs). A TFC is selected for an uplink dedicated channel and a TFC is selected for an enhanced uplink (EU) channel. The TFC for the dedicated channel is selected first and independently of the TFC selection of the EU channel. The TFC for the EU channel is selected within a remaining WTRU transmit power after the TFC selection for the dedicated channel.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a flow diagram of a general process for selecting TFCs in accordance with a first embodiment of the present invention.
  • FIG. 2 is a flow diagram of a process for selecting TFCs in accordance with a second embodiment of the present invention.
  • FIG. 3 is a flow diagram of a process for selecting TFCs in accordance with a third embodiment of the present invention.
  • FIG. 4 is a flow diagram of a process for selecting TFCs in accordance with a fourth embodiment of the present invention.
  • FIG. 5 is a block diagram of an apparatus for selecting TFCs in accordance with the present invention.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Hereafter, the terminology “WTRU” includes but is not 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 may be incorporated into an integrated circuit (IC) or be configured in a circuit comprising a multitude of interconnecting components.
  • Hereinafter, the present invention will be described with reference to a system supporting two CCTrCHs, (i.e., a dedicated CCTrCH and an EU CCTrCH). However, it should be noted that the present invention is applicable to a system supporting more than two CCTrCHs.
  • FIG. 1 is a flow diagram of a process 100 for selecting TFCs in accordance with a first embodiment of the present invention. The WTRU is configured to process a dedicated CCTrCH and an EU CCTrCH simultaneously in uplink transmission. The transmit power of the WTRU is limited to a maximum allowed WTRU transmit power, which is set by the wireless communication system. In each transmit time interval (TTI), the WTRU estimates the transmit power for each of a plurality of available TFCs (step 102) for each CCTrCH. The WTRU estimates the transmit power of each TFC over a predetermined period taking into account the gain factor of each corresponding TFC. The WTRU then selects TFCs for transmission on 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 maximum allowed WTRU transmit power (step 104).
  • Additionally, the dedicated CCTrCH, the EU CCTrCH, or both may be provided with a capability of transmitting a reserved minimum set of TFCs even when the power required for transmission of these TFCs exceeds the maximum allowed WTRU transmit power. TFCs that require power greater then the maximum allowed transmit power are defined to be in an excess power state. The minimum set is for reserving a lowest rate in a CCTrCH, thereby maintaining the basic services for the channel. Since in the EU CCTrCH there is only one TrCH, the minimum set corresponds to a lowest rate per logical channel or MAC-d flow mapped to the EU TrCH. The minimum set of TFCs may be one transport block per TTI for each channel mapped to the CCTrCH or a number of transport blocks per TTI corresponding to a guaranteed bit rate (GBR).
  • The reserved minimum set of TFCs may be transmitted in an excess power state. In order to maintain the transmit power within the allowed maximum level, a WTRU scales down power on physical channels mapped to the dedicated CCTrCH, the EU CCTrCH, or all physical channels present.
  • Regardless of the TFC selection, the EU CCTrCH may be provided with a minimum reserved set of TFCs that 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 is equivalent to a data rate. The reserved set of TFCs can be transmitted in an excess power state by scaling down power on either the physical channels mapped to the EU CCTrCH, the dedicated CCTrCH or all present UL channels.
  • FIG. 2 is a flow diagram of a process 200 for selecting TFCs in accordance with a second embodiment of the present invention. TFC selection of the dedicated CCTrCH is prioritized over TFC selection of the EU CCTrCH. In 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). After the TFC for the dedicated CCTrCH is selected, at each TTI of the EU CCTrCH the WTRU selects a TFC for the EU CCTrCH within the remaining WTRU transmit power after the power required for the selected TFC for the dedicated CCTrCH is deducted from the maximum allowed WTRU transmit power (step 206). The TFC selection of the dedicated CCTrCH is not affected by the operation of 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 EU CCTrCH is estimated either each dedicated CCTrCH TTI or each EU CCTrCH TTI. At each TTI of the EU CCTrCH, the remaining power available for the EU CCTrCH is estimated as the maximum allowed WTRU transmit power minus the power required by transmission of the selected dedicated CCTrCH TFC. Alternatively, at each TTI of the dedicated CCTrCH, the remaining power available for the EU CCTrCH is estimated as the maximum allowed WTRU transmit power minus the power required to support transmission of the selected dedicated CCTrCH TFC.
  • In process 200, the EU CCTrCH may allow transmission of a minimum set of TFCs even when these TFCs are in excess power state. An EU TFC is in excess power state when the estimated remaining power is less then the calculated transmission power requirement for the EU CCTrCH TFC. The EU minimum set reserves a lowest or guaranteed rate on channels mapped to the EU CCTrCH, and thereby maintains the basic services for EU channels. Since in the EU CCTrCH there is only one TrCH, the minimum set corresponds to a lowest rate per logical channel or MAC-d flow mapped to the EU TrCH. The minimum set of TFCs may be one transport block per TTI for each channel mapped to the CCTrCH or a number of transport blocks per TTI corresponding to a guaranteed bit rate (GBR). When transmitting a TFC in excess power state, in order to maintain the transmit power within the allowed maximum level, the WTRU scales down power on physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all physical channels present.
  • FIG. 3 is a flow diagram of a process 300 for selecting TFCs in accordance with a fourth embodiment of the present invention. The WTRU gives priority to dedicated CCTrCH TFC selection while reserving transmit power for a minimum set of EU CCTrCH TFCs (step 302). A minimum set of TFCs for an EU CCTrCH is defined to reserve a lowest or guaranteed rate for channels mapped to the EU CCTrCH. Since in the EU CCTrCH there is only one TrCH, the minimum set corresponds to a lowest rate per logical channel or MAC-d flow mapped to the EU TrCH. The minimum set of TFCs may be one transport block per TTI for each channel mapped to the CCTrCH, or a number of transport blocks per TTI corresponding to a GBR.
  • The EU CCTrCH may allow transmission of a minimum set of TFCs even when these TFCs are in excess power state. An EU TFC is in excess power state when the estimated remaining power is less then the calculated transmission power requirement for the EU TFC. When transmitting a TFC in excess power state, in order to maintain the transmit power within the allowed maximum level, the WTRU scales down power on physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all physical channels present.
  • When a TFC is in an excess power state (with reduced power), the quality of the transmission is reduced, (i.e., lower SIR, higher BLER, etc). This may defeat the purpose of maintaining the minimum set. Therefore, in order to minimize the possibility that the EU CCTrCH TFC has to be transmitted in an excess power state, and to further insure the minimum set is really supported, in process 300 transmit power is reserved for the EU minimum set when TFC selection is performed on the prioritized dedicated CCTrCH.
  • TFC selection of the dedicated CCTrCH is prioritized over TFC selection of the EU CCTrCH. In 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 TFCs associated with the EU CCTrCH minimum set (step 304). The WTRU selects a TFC for the dedicated CCTrCH that has a power requirement that does not exceed the maximum allowed transmit power minus the power required to support the minimum set of TFCs on the EU CCTrCH (step 306). After the TFC for the dedicated CCTrCH is selected, at each TTI of the EU CCTrCH the WTRU selects a TFC for the EU CCTrCH with the remaining transmit power after power required for the selected the TFC for the dedicated CCTrCH is deducted from the maximum allowed transmit power (step 308).
  • The remaining power for the EU CCTrCH is estimated either each dedicated CCTrCH TTI or each EU CCTrCH TTI. At each TTI of the EU CCTrCH, the remaining power available for the EU CCTrCH is estimated as the maximum allowed WTRU transmit power minus the power required by transmission of the selected dedicated CCTrCH TFC. Alternatively, at each TTI of the dedicated CCTrCH, the remaining power available for the EU CCTrCH is estimated as the maximum allowed WTRU transmit power minus the power required to support transmission of the selected dedicated CCTrCH TFC.
  • Since the dedicated CCTrCH TFC selection takes precedence over the EU CCTrCH, and the power requirement may change during the dedicated TTI, the minimum set of TFCs of the EU CCTrCH may still be transmitted in an excess power state even though power was reserved when the dedicated TFC was selected. In this situation, in order to maintain the transmit power within the allowed maximum level, the WTRU scales down all physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all physical channels present.
  • FIG. 4 is a flow diagram of a process 400 for selecting TFCs in accordance with a third embodiment of the present invention. The WTRU sets an individual maximum transmit power, or a ratio relative to the maximum allowed WTRU transmit power, for a dedicated CCTrCH and an EU CCTrCH (step 402). The maximum power level (or the ratio) for each CCTrCH is a configurable parameter. The factors for determining the maximum power level (or the ratio) for each CCTrCH may include, but are not limited to, a data rate of each CCTrCH, quality-of-service (QoS) of each CCTrCH and a relative priority between the CCTrCHs.
  • In each TTI of the dedicated CCTrCH and in each TTI of the EU CCTrCH, the WTRU estimates the transmit power for each of a plurality of available TFCs (step 404). The WTRU then selects a TFC for each CCTrCH within the individual maximum transmit power of each CCTrCH (step 406). The TFC selection process for each CCTrCH operates independently. The TFC of each CCTrCH is selected from only 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 a capability of transmitting a minimum set of TFCs. The minimum set is for reserving a lowest rate for each channel mapped to the CCTrCH, thereby maintaining the basic services for each channel. Since in the EU CCTrCH there is only one TrCH, the minimum set corresponds to a lowest rate per logical channel or MAC-d flow mapped to the EU TrCH. The minimum set of TFCs may be one transport block per TTI for each channel mapped to the CCTrCH or a number of transport blocks per TTI corresponding to a GBR.
  • The minimum set of TFCs may be transmitted in an excess power state. In this situation, in order to maintain the transmit power within the allowed maximum level, the WTRU scales down all physical channels mapped to the EU CCTrCH, the dedicated CCTrCH, or all physical channels present.
  • FIG. 5 is a block diagram of an apparatus 500 for selecting TFCs in accordance with the present invention. The apparatus 500 comprises a transmit power estimation unit 502, a TFC selection unit 504, and a measurement unit 506. The transmit power estimation unit 502 calculates an estimate of a transmit 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 WTRU transmit power for the selected TFCs is within a maximum WTRU transmit power. The measurement unit 506 performs physical measurements of the WTRU transmit power over a predetermined period, and the transmit power estimation unit 502 calculates the estimate of a transmit power of each TFC using the measurement results and a gain factor of the corresponding TFC.
  • Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone without the other features and elements of the preferred embodiments or in various combinations with or without other features and elements of the present invention.

Claims (18)

What is claimed is:
1. A method implemented in a wireless transmit/receive unit (WTRU) for selecting a transport format combination (TFC), the WTRU being configured to process more than one channel for uplink transmission, the method comprising:
estimating a transmit power for each of a plurality of available TFCs; and
selecting a TFC for an uplink dedicated channel and a TFC for an enhanced uplink (EU) channel, wherein the TFC for the dedicated channel is selected first and independently of the TFC selection of the EU channel, and wherein the TFC for the EU channel is selected within a remaining WTRU transmit power after the TFC selection for the dedicated channel.
2. The method of claim 1 wherein one TFC is selected for each transmit time interval (TTI) of the dedicated channel and one TFC is selected for each TTI of the EU channel.
3. The method of claim 1 wherein the remaining WTRU transmit power is estimated every transmit time interval of either the EU channel or the dedicated channel.
4. The method of claim 1 wherein a minimum set of TFCs is reserved for each uplink channel, whereby each uplink channel always has a possibility to transmit the minimum set of TFCs even when the minimum set of TFCs is in excess power.
5. The method of claim 4 further comprising scaling down physical channels in each uplink channel in response to a transmit power of at least one uplink channel being in excess power.
6. The method of claim 4 wherein the minimum set of reserved TFCs is one or more protocol data units per medium access control (MAC-d) flow or logical channel per transmit time interval.
7. The method of claim 1 wherein the selecting a TFC further comprises selecting a TFC for each uplink channel within an individual maximum allowed transmit power designated to each uplink channel.
8. The method of claim 7 wherein the individual maximum allowed transmit power is determined by at least one of a data rate, quality of service and relative priority between uplink channels.
9. The method of claim 7 wherein a minimum set of TFCs is reserved for each uplink channel, whereby each uplink channel always has a possibility to transmit the minimum set of TFCs even when the minimum set of TFCs is in excess power.
10. The method of claim 9 further comprising scaling down physical channels in each uplink channel in response to a transmit power of at least one uplink channel being in excess power.
11. The method of claim 9 wherein the minimum set of reserved TFCs is one or more protocol data units per medium access control (MAC-d) flow or logical channel per transmit time interval.
12. The method of claim 1 wherein the transmit power for each of a plurality of available TFCs is estimated in each transmit time interval.
13. A wireless transmit/receive unit (WTRU) for selecting transport format combinations (TFCs) for a plurality of uplink channels, the WTRU comprising:
a transmit power estimation unit configured to estimate a transmit power for each of a plurality of available TFCs; and
a TFC selection unit configured to select a TFC for an uplink dedicated channel and a TFC for an enhanced uplink (EU) channel, wherein the TFC for the dedicated channel is selected first and independently of the TFC selection of the EU channel, and wherein the TFC for the EU channel is selected within a remaining WTRU transmit power after the TFC selection for the dedicated channel.
14. The WTRU of claim 13 wherein one TFC is selected for each transmit time interval (TTI) of the dedicated channel and one TFC is selected for each TTI of the EU channel.
15. The WTRU of claim 13 wherein the remaining WTRU transmit power is estimated every transmit time interval of either the EU channel or the dedicated channel.
16. The WTRU of claim 13 wherein a minimum set of TFCs is reserved for each uplink channel, whereby each uplink channel always has a possibility to transmit the minimum set of TFCs even when the minimum set of TFCs is in excess power.
17. The WTRU of claim 16 wherein the WTRU is configured to scale down physical channels in each uplink channel in response to a transmit power of at least one uplink channel being in excess power.
18. The WTRU of claim 16 wherein the minimum set of reserved TFCs is one or more protocol data units per medium access control (MAC-d) flow or logical
Figure US20130250892A1-20130926-P00999
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US12/422,516 US8483148B2 (en) 2004-01-09 2009-04-13 Transport format combination selection in a wireless transmit/receive unit
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