WO2010147051A1 - Systems and methods for reduced power amplifier transmission - Google Patents

Systems and methods for reduced power amplifier transmission Download PDF

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Publication number
WO2010147051A1
WO2010147051A1 PCT/JP2010/059885 JP2010059885W WO2010147051A1 WO 2010147051 A1 WO2010147051 A1 WO 2010147051A1 JP 2010059885 W JP2010059885 W JP 2010059885W WO 2010147051 A1 WO2010147051 A1 WO 2010147051A1
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WO
WIPO (PCT)
Prior art keywords
mode
reduced
enb
antenna
preference signal
Prior art date
Application number
PCT/JP2010/059885
Other languages
French (fr)
Inventor
Kimihiko Imamura
Kenneth J. Park
John M. Kowalski
Sayantan Choudhury
Original Assignee
Sharp Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Priority to EP10789426.3A priority Critical patent/EP2443879A4/en
Priority to CN201080026840.5A priority patent/CN102804865B/en
Priority to JP2011553197A priority patent/JP5697610B2/en
Priority to MX2011012776A priority patent/MX2011012776A/en
Priority to KR1020127000094A priority patent/KR101390550B1/en
Publication of WO2010147051A1 publication Critical patent/WO2010147051A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • 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
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H04W52/028—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof switching on or off only a part of the equipment circuit blocks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission 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
    • H04W52/02—Power saving arrangements
    • 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
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H04W52/0277—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof according to available power supply, e.g. switching off when a low battery condition is detected
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/045—Circuits with power amplifiers with means for improving efficiency
    • 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 disclosure relates generally to wireless communication systems. More specifically, the present disclosure relates to systems and methods for providing a reduced power amplifier (PA) transmission mode .
  • PA reduced power amplifier
  • a wireless communication system may provide communication for a number of mobile stations, each of which may be serviced by a base station .
  • the 3rd Generation Partnership Project also referred to as "3GPP," is a collaboration agreement that aims to define globally applicable technical specifications and technical reports for third generation wireless communication systems.
  • the 3GPP may define specifications for the next generation mobile networks, systems, and devices.
  • a mobile station is typically referred to as a user equipment (UE)
  • a base station is typically referred to as a Node B or an evolved Node B (eNB) .
  • UE user equipment
  • eNB evolved Node B
  • LTE Long Term Evolution
  • UMTS Evolved Universal Terrestrial Radio Access
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • LTE-Advanced is the next generation of LTE.
  • the PUSCH Physical Uplink Shared Channel
  • the 3GPP is attempting to specify several transmission modes, i.e . , TxD (transmit diversity) , SU-MIMO (single user-MIMO) and MU-MIMO (multi- user-MIMO) for PUSCH .
  • TxD transmit diversity
  • SU-MIMO single user-MIMO
  • MU-MIMO multi- user-MIMO
  • Supporting SU-MIMO in LTE- Advanced means that at least some UEs have to support two power amplifiers.
  • a user equipment for reduced power amplifier transmission.
  • the user equipment comprises : multiple antennas transmitting and receiving signals, and multiple power amplifiers supporting multiple antenna transmission, wherein a subset of the multiple PAs are used to transmit uplink signals when the UE operates in a reduced power amplifier (PA) mode.
  • PA reduced power amplifier
  • a method for reduced power amplifier transmission comprises steps of supporting multiple antenna transmission via multiple power amplifiers; and using a subset of the multiple amplifiers to transmit uplink signals when the UE operates in the reduced PA mode.
  • an enhanced Node B for reduced power amplifier transmission.
  • the eNB comprises a unit determining that a user equipment (UE) should operate in a reduced power amplifier (PA) mode based on at least one of a preference signal received from the UE, capability information received from the UE, and eNB measurement results; and a unit instructing the UE to transition to the reduced PA mode .
  • UE user equipment
  • PA reduced power amplifier
  • Figure 1 illustrates a system for reducing power consumption in a UE
  • Figure 2 illustrates a method for reducing power consumption in a UE
  • Figure 3 illustrates one example of a reduced PA mode, namely a one antenna mode
  • Figure 4 illustrates a UE that is configured to operate in the one antenna mode
  • Figure 5 illustrates another example of a reduced PA mode, namely an antenna selection mode
  • Figure 6 illustrates a UE that is configured to operate in the antenna selection mode
  • Figure 7 illustrates another UE that is configured to operate in the antenna selection mode
  • Figure 8 illustrates another example of a reduced PA mode
  • Figure 9 illustrates an example of a UE sending a preference signal to an eNB via MAC control signaling
  • Figure 10 illustrates an example of a UE sending a preference signal via RRC connection re-establishment signaling
  • Figure 1 1 illustrates an example of a UE sending a preference signal via UE capability transfer signaling
  • Figure 12 illustrates an example of a UE sending a preference signal via a measurement report
  • Figure 13 illustrates an example of a UE sending a preference signal via NAS control signaling
  • Figure 14 illustrates an example of a preference signal that may be sent from a UE to an eNB; and Figure 15 illustrates various components that may be utilized in a communication device.
  • the present disclosure relates to a "reduced power amplifier (PA) mode" for user equipment (UE) that supports multiple antenna transmission via multiple PAs.
  • PA reduced power amplifier
  • UE user equipment
  • a subset of the UE's power amplifiers are used to transmit uplink signals. Reducing the number of power amplifiers that are utilized by a UE may significantly reduce the amount of power that is consumed by the UE, and therefore extend the life of the UE's battery.
  • a user equipment includes multiple power amplifiers.
  • the UE also includes a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions are executable by the processor to support multiple antenna transmission via the multiple power amplifiers.
  • the instructions are also executable to operate in a reduced power amplifier (PA) mode.
  • PA reduced power amplifier
  • the reduced PA mode may be an uplink transmission mode .
  • the uplink transmission mode may be a one antenna mode .
  • the uplink transmission mode may be an antenna selection mode.
  • the reduced PA mode may be a radio access technology (RAT) mode, and the RAT mode may be a Long Term Evolution (LTE) mode.
  • RAT radio access technology
  • Only one of the multiple power amplifiers may be used when the UE operates in the reduced PA mode. Alternatively, more than one of the multiple power amplifiers may be used when the UE operates in the reduced PA mode .
  • the instructions may also be executable to send a preference signal to an e-Node B (eNB) .
  • the preference signal may include a request for the UE to operate in the reduced PA mode.
  • the preference signal may be sent via Media Access
  • MAC Radio Resource Control
  • RRC radio resource control
  • Non-Access Stratum (NAS) control signaling etc.
  • the preference signal may include at least one of UE type, battery status, and application type.
  • the instructions may also be executable to send capability information to an eNB via UE capability transfer signaling.
  • the instructions may also be executable to implicitly send capability information to an eNB .
  • the instructions may also be executable to create a preference signal based on evaluating reduced PA mode criteria.
  • the reduced PA mode criteria may include pathloss information, battery status, an indicator of an E9 1 1 call, etc .
  • a method that is implemented by a user equipment (UE) is disclosed. The method includes supporting multiple antenna transmission via multiple power amplifiers. The method also includes operating in a reduced power amplifier (PA) mode, wherein a subset of the multiple PAs are used to transmit uplink signals when the UE operates in the reduced
  • PA reduced power amplifier
  • the reduced PA mode may be at least one of a one antenna mode, an antenna selection mode, and a Long Term Evolution (LTE) mode.
  • LTE Long Term Evolution
  • the eNB includes a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions are executable by the processor to determine that a user equipment (UE) should operate in a reduced power amplifier (PA) mode based on at least one of a preference signal received from the UE, capability information received from the UE, and eNB measurement results .
  • the instructions are also executable by the processor to instruct the UE to transition to the reduced PA mode .
  • FIG. 1 illustrates a system 100 for reducing power consumption in a UE 102.
  • the UE 102 is an electronic device that may be used for voice and/ or data communication over a wireless communication network, such as a cellular network.
  • the UE 102 may be a cellular phone, a smart phone, a personal digital assistant (PDA) , a card in a laptop or personal computer, etc.
  • PDA personal digital assistant
  • An evolved Node B (eNB) .104 facilitates wireless communication between the UE 102 and a network.
  • the eNB 104 is a fixed station that contains radio frequency transmitters and receivers that are used to communicate directly with UEs 102 , which may move freely around the eNB 104.
  • Signals that are transmitted from the UE 102 to the eNB 104 are referred to as uplink signals, and signals that are transmitted from the eNB 104 to the UE 102 are referred to as downlink signals.
  • the UE 102 includes multiple power amplifiers 106 (e .g. PA 106a and PA 106b) and multiple transmit antennas 108.
  • a first transmit antenna 108a and a second transmit antenna 108b are specifically shown in Figure 1 .
  • a power amplifier (PA) 106 may be used to amplify a signal from a transmitter for transmission through a transmit antenna 108.
  • the scheduler 1 10 capability information 1 12 , preference signal 1 14 , reduced PA mode criteria 1 16, and mode instructions 1 18 will be discussed below in connection with Figure 2.
  • Figure 2 illustrates a method 200 for reducing power consumption in a UE 102.
  • the UE 102 supports S202 multiple antenna 108 transmission via the multiple PAs 106.
  • the UE 102 is also capable of operating in a reduced PA mode, in which a subset of the multiple PAs 106 are used to transmit uplink signals.
  • a subset of the multiple PAs 106 are used to transmit uplink signals.
  • only one of the PAs 106 may be used when the UE 102 operates in the reduced PA mode .
  • more than one (but fewer than all) of the PAs 106 may be used when the UE 102 operates in the reduced PA mode . For example, if the UE 102 has four PAs
  • the UE 102 may utilize one, two, or three PAs 106 when operating in the reduced PA mode .
  • the UE 102 may send S204 capability information 1 12 to the eNB 104.
  • the capability information 1 12 may indicate to the eNB 104 that the UE 102 is capable of operating in the reduced PA mode .
  • the scheduler 1 10 at the eNB 104 may decide whether or not the UE 102 operates in the reduced PA mode .
  • the UE 102 may send S206 a preference signal 1 14 to the eNB 104.
  • the preference signal 1 14 may include a request for the UE 102 to operate in the reduced PA mode .
  • the UE 102 may create the preference signal 1 14 based on evaluating reduced PA mode criteria 1 16
  • the eNB 104 may measure S208 channel conditions.
  • the eNB scheduler 1 10 may determine
  • the eNB scheduler 1 10 may then instruct 2 12 the UE 102 to transition to the reduced PA mode . This may involve sending a mode instruction 1 18 to the UE 102. In response, the UE 102 may operate 2 14 in the reduced PA mode .
  • Figure 3 illustrates one example of a reduced PA mode, namely a one antenna mode 320.
  • a UE 302 may be capable of operating in multiple uplink transmission modes 318, including the one antenna mode 320, as well as a transmit diversity mode 322 , an open loop SU-MIMO (single-user multiple-input multiple-output) mode 324, a closed loop SU-MIMO (single-user multiple-input multiple-output) mode 324, a closed loop SU-MIMO (single-user multiple-input multiple-output) mode 324, a closed loop SU-
  • multiple uplink transmission modes 318 including the one antenna mode 320, as well as a transmit diversity mode 322 , an open loop SU-MIMO (single-user multiple-input multiple-output) mode 324, a closed loop SU-
  • SU-MIMO single-user multiple-input multiple-output
  • FIG. 4 illustrates a UE 402 that is configured to operate in the one antenna mode 320.
  • the UE 402 may include a scrambling component 432 , a modulation mapper 434 , a transform precoder 436, a resource element mapper 438, an SC-FDMA signal generator 440, a digital-to-analog
  • D/A converter 442 receives data from external source 402.
  • RF radio frequency
  • the UE 402 uses only one D/A converter 442 , one RF component 444, one PA 406 , and one antenna 408 to transmit uplink signals. This is true even if the UE 402 has more than one D /A converter 442 , more than one RF component 444 , more than one PA 406, and/ or more than one antenna 408.
  • Figure 5 illustrates another example of a reduced PA mode, namely an antenna selection mode 546.
  • a UE 502 may be capable of operating in multiple uplink transmission modes 5 18, including the antenna selection mode 546, as well as a transmit diversity mode 522 , an open loop SU-MIMO mode 524 , a closed loop SU-MIMO mode 526, a MU-MIMO mode 528, etc .
  • An eNB 504 may configure the UE 502 to operate in a particular uplink transmission mode 5 18 via RRC signaling 530.
  • Figure 6 illustrates a UE 602 that is configured to operate in the antenna selection mode 546.
  • the UE 602 includes a scrambling component 632 , a modulation mapper 634 , a transform precoder 636, a resource element mapper 638, an SC-FDMA signal generator 640, a D /A converter 642 , an RF component 644 , a PA 606, an antenna switching module (antenna switch) 648, and first and second transmit antennas 608a, 608b.
  • the UE 602 may use only one D /A converter 642 , one RF component 644, one PA 606, and one antenna 608 to transmit uplink signals. This may be true even though the UE 602 has more than one antenna 608a, 608b.
  • the UE 602 may switch the antenna
  • 608a, 608b that is used to transmit uplink signals via the antenna switching module 648.
  • Figure 7 illustrates another UE 702 that is configured to operate in the antenna selection mode 546.
  • the UE 702 includes a scrambling component 732 , a modulation mapper
  • first and second SC-FDMA signal generators 740a, 740b first and second SC-FDMA signal generators 740a, 740b, first and second D /A converters 742a, 742b, first and second
  • the UE 702 may use multiple D /A converters 742a, 742b, multiple RF components
  • An antenna switch signal 750 may be applied to the resource element mapper 738 to determine whether the first set of components 740a, 742a, 744a, 746a, 708a or the second set of components 740b, 742b, 744b, 746b, 708b is used.
  • the UE 702 configuration shown in Figure 7 requires the rapid on and off of PAs 746.
  • the UE 702 configuration shown in Figure 7 is suitable for dynamic switching, whereas the UE 602 configuration shown in Figure 6 is suitable for semi-static switching.
  • FIG 8 illustrates another example of a reduced PA mode .
  • the reduced PA mode is a radio access technology (RAT) mode 854. More specifically, the reduced PA mode is an LTE mode 856 (i. e. , LTE Release 8) .
  • LTE mode 856 i. e. , LTE Release 856
  • the UE 802 uses only one transmit antenna to transmit uplink signals.
  • the eNB 804 may ask the UE 802 to transition from LTE-Advanced mode 858 or UTRA mode 860 (or another mode) to LTE mode 856.
  • the UE 802 is configured to support these types of transitions.
  • the process may be similar to the usual inter-RAT handover between LTE-Advanced 858 and LTE 856. Both the downlink and the uplink transition to LTE mode 856 in this case, but the UE 802 can have the benefit of longer battery life through this transition.
  • Figure 8 shows the eNB 804 sending a transition request 852 to the UE 802.
  • a UE 102 may send a preference signal 1 14 to an eNB 104.
  • the preference signal 1 14 may include a request for the UE 102 to operate in the reduced PA mode.
  • the preference signal 1 14 may be sent via higher layer signaling, such as Media Access Control (MAC) control signaling, via RRC connection re-establishment signaling, via UE capability transfer signaling, via a measurement report, via NAS (Non-Access Stratum) control signaling, etc.
  • MAC Media Access Control
  • RRC connection re-establishment signaling via UE capability transfer signaling
  • UE capability transfer signaling via a measurement report
  • NAS Non-Access Stratum
  • Figure 9 illustrates an example of a UE 902 sending a preference signal 1 14 to an eNB 904 via MAC control signaling 962.
  • the UE 902 may send the battery status (e.g. , battery voltage, remaining battery charge, current flow given battery type, etc. ) as a preference signal 1 14 via MAC control signaling 962.
  • the eNB scheduler 1 10 chooses the appropriate uplink transmission mode 3 18, taking into account the traffic load and channel state information as well as the battery status that it received from the UE 902.
  • the eNB 904 sends the selected uplink transmission mode 3 18 to the UE 902 via RRC information elements 964.
  • FIG 10 illustrates an example of a UE 1002 sending a preference signal 1 14 via RRC connection re-establishment signaling.
  • a UE 1002 may send a request for handover from LTE-Advanced mode 858 to LTE mode 856 as a preference signal 1 14 via an RRCConnectionRequest message 1068.
  • the eNB scheduler 1 10 chooses the appropriate RAT mode 854 , taking into account the traffic load and channel state information as well as the request that was received from the UE 1002.
  • the UTRAN (UMTS Terrestrial Radio Access Network) 1066 may send an RRCConectionSetup message 1070 to the UE 1002 to cause the handover to the LTE mode 856 to occur.
  • the UE 1002 may send an RRCConnectionSetupComplete message 1072 to the UTRAN 1066.
  • Figure 1 1 illustrates an example of a UE 1 102 sending a preference signal 1 14 via UE capability transfer signaling.
  • an eNB 1 104 may send a UECapabilityEnquiry message
  • the UE 1 102 may send a UECapabilitylnformation message 1 176 to the eNB 1 104.
  • the UECapabilitylnformation message 1 176 may include the UE type (e. g. , handset, PC, etc. ) and/ or the battery status (e .g. , battery voltage, etc. ) as a preference signal 1 14.
  • the eNB scheduler 1 10 may choose the appropriate UL transmission mode 3 18 , taking into account the traffic load and channel state information as well as the UE type and battery status received from the UE 1 102.
  • the eNB 1 104 and the UE 1 102 may repeat the first three steps periodically.
  • the eNB 1 104 may send the selected UL transmission mode 318 via RRC information elements 1 178.
  • FIG 12 illustrates an example of a UE 1202 sending a preference signal 1 14 via a measurement report.
  • the EUTRAN (Evolved UTRAN) 1280 may set up a battery status reporting threshold, a timer period value, etc . , via an RRCConnectionReconfiguration message 1282.
  • the UE 1202 may send an RRCConectionReconfigurationComplete message 1284 to the EUTRAN 1280.
  • the battery status reporting threshold, the timer period value, etc . may be used as a trigger for sending a measurement report 1286.
  • the UE 1202 may send a battery status report as a measurement report 1286 when the battery voltage becomes lower than the configured battery status reporting threshold or the timer period has expired.
  • Figure 13 illustrates an example of a UE 1302 sending a preference signal 1 14 via NAS control signaling 1388.
  • the UE 1302 may send the UE type (e . g. , handset, PC, etc.) and / or the battery status (e.g. , battery voltage, etc .) as a preference signal 1 14 via NAS control signaling 1388.
  • the eNB scheduler 1 10 may choose the appropriate UL transmission mode 3 18, taking into account the traffic load and channel state information as well as the UE type and/ or the battery status received from the UE 1302.
  • the eNB 104 (as part of the EUTRAN 1380) may send the selected UL transmission mode 3 18 via RRC information elements 1390.
  • a UE 102 may send capability information 1 12 to an eNB 104.
  • the capability information 1 12 may indicate to the eNB 104 that the UE 102 is capable of operating in the reduced PA mode .
  • the capability information 1 12 may be sent via UE capability transfer signaling, which was discussed above in connection with Figure 1 1 .
  • the capability information 1 12 may be included in the UECapabilitylnformation 1 176 message .
  • the capability information 1 12 may be sent via implicit signaling.
  • a UE 102 may indicate to the eNB 104 via UE capability transfer signaling that the UE
  • the UE 102 is capable of supporting multiple PAs 106.
  • the UE 102 may send the battery status to the eNB 104 by using MAC control signaling, RRC connection re- establishment signaling, UE capability transfer signaling, or NAS control signaling.
  • Figure 14 illustrates an example of a preference signal
  • a preference signal 1414 may include the UE type 1492.
  • UE type 1492 may be, for example, a handset, a PDA, a PC, etc.
  • a preference signal 14 14 may also include the battery status 1494.
  • the battery status 1494 may indicate whether the UE 102 has a low battery or not. Alternatively, the battery status 1494 may be a value indicating the battery's present charge .
  • a preference signal 1414 may also include an application type 1496.
  • the application type 1496 may indicate whether the application that is being used by the UE 102 is a voice application, a data application, an E9 1 1 call, etc.
  • An E9 1 1 signal may be considered to be a preference signal 14 14 because it may be beneficial to have a longer battery life when a UE 102 calls to E9 1 1 .
  • a preference signal 1414 may include channel conditions 1497.
  • the channel conditions 1497 may include rank . information (e. g. , Rank l , more than Rank2 , etc.) .
  • the channel conditions 1497 may also include pathloss information (e .g. , whether the difference between downlink signal reception levels for different antennas exceeds a threshold or not) .
  • a preference signal 1414 may also include embedded sensor information 1498.
  • a UE 102 may include an accelerometer, in which case the embedded sensor information 1498 may indicate whether the UE 102 is in the horizontal position (landscape mode) , the vertical position (portrait mode) , etc .
  • a preference signal 14 14 may also include a user's command 1499 , such as whether the user has requested a longer battery mode (e .g. , through a user interface) .
  • a UE 102 may create a preference signal 1 14 based on evaluating reduced PA mode criteria 1 16. Several examples of this will now be discussed.
  • the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers to transmit in the reduced PA mode. In this case, the UE 102 may have only limited battery capacity and the battery may be almost running out.
  • the UE 102 may send a preference signal 1 14 that tells the eNB
  • the UE 102 may have only limited battery capacity and the user may want to have a longer battery life rather than a high data rate.
  • the UE type 1492 is "handset" and the channel conditions 1497 are "Rank l ,” then the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode .
  • the UE 102 may have only limited battery capacity and either antenna 108 on the UE 102 may be covered by the user's hand.
  • the UE type 1492 is "handset" and pathloss information (which may be included in channel conditions 1497) indicates that the difference between the reception level between antennas 108 exceeds a given threshold
  • the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode .
  • the UE 102 may have only limited battery capacity and either antenna 108 on the UE 102 may be covered by the hand or similarly obstructed.
  • the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode.
  • the UE type 1492 is "PDA” and the application type 1496 is "voice” and pathloss information (which may be included in channel conditions 1497) indicates that the difference between the reception level between antennas 108 exceeds a given threshold, then the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode . If the user will hold the UE 102 in a different style depending on its application (e . g.
  • the preference signal 1 14 may indicate that one of the antennas 108 on the UE 102 is covered by the user's hand or is otherwise obstructed. In this case , the reduced PA mode may be beneficial from the perspective of longer battery life .
  • the UE type 1492 is "PDA” and the accelerometer indicates “vertical mode” (via embedded sensor information 1498)
  • the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode .
  • the preference signal 1 14 may indicate that one of the antennas 108 on the UE 102 is covered by the user's hand or is otherwise obstructed.
  • the UE type 1492 is "PC (e .g.
  • the UE 102 may not send a preference signal 1 14 or the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 does not prefer the reduced PA mode. This may be because a PC has a large battery or can connect to a power outlet. On the other hand, if the laptop is on battery power, and the internal detector in the laptop indicates "low battery,” then signaling may be initiated to go into the reduced PA mode .
  • an eNB 104 may measure 208 channel conditions. This may be accomplished via receiving reference signals, e.g., demodulation reference signals, sounding reference signals, etc. For example, an eNB 104 may measure rank information, e.g., Rankl, more than Rank2, conditioning information (e.g., the ratio of the highest to lowest values of the channel matrix), etc. Also, an eNB 104 may measure CQI (channel quality information), PMI (precoding matrix indexes), pathloss information (e.g., whether the difference between downlink signal reception levels for different antennas 108 exceeds a threshold or not), etc. An eNB 104 may also measure the UE's 102 application type 1496 (e.g., voice, data, etc.).
  • rank information e.g., Rankl, more than Rank2, conditioning information (e.g., the ratio of the highest to lowest values of the channel matrix), etc.
  • CQI channel quality information
  • PMI precoding matrix indexes
  • the eNB scheduler 110 may determine 210 whether a UE 102 should operate in reduced PA mode. In making this determination, the eNB scheduler
  • a preference signal 114 received from the UE 102 may take into account a preference signal 114 received from the UE 102, capability information 112 received from the UE 102, eNB 104 measurement results, traffic information (for the cell and/or for the UE 102), etc.
  • a preference signal 114 received from the UE 102 may take into account a preference signal 114 received from the UE 102, capability information 112 received from the UE 102, eNB 104 measurement results, traffic information (for the cell and/or for the UE 102), etc.
  • the eNB scheduler 110 may select the reduced PA mode for a UE 102 when the UE 102 sends a preference signal 114 that tells the eNB 104 that the UE 102 prefers reduced PA mode.
  • the preference signal 114 directly affects the behavior of the eNB scheduler 110.
  • the eNB scheduler 1 10 may add a reduced PA mode (e.g. , one antenna mode 320, antenna selection mode 546) and remove the transmit diversity mode 322 for a UE 102 to the set of transmission mode candidates when the UE 102 sends a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode.
  • the eNB scheduler 1 10 may select the appropriate transmission mode 318 based on eNB 104 measurement results, e .g. , CQI , PMI , rank information and/ or pathloss.
  • the preference signal 1 14 may provide the function of narrowing down the eNB scheduler's 1 10 choice of transmission modes 3 18.
  • the eNB scheduler 1 10 may select the reduced PA mode for a UE 102 when the UE 102 sends a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode and pathloss information in the eNB 104 measurement results indicates that the difference between the UE's 102 antenna levels exceeds a given threshold.
  • either antenna 108 on the UE 102 may be covered by the user's hand or may be otherwise obstructed so that the eNB scheduler 1 10 may select the reduced PA mode.
  • the eNB scheduler 1 10 may select the reduced PA mode for a UE 102 when the UE's 102 traffic is voice traffic and the pathloss information in the eNB 104 measurement results indicates that the difference between the UE's 102 antenna levels exceeds a given threshold.
  • the eNB scheduler 1 10 may select the reduced PA mode for a UE 102 when the UE 102 sends a preference signal 1 14 that indicates to the eNB 104 that the
  • FIG. 15 illustrates various components that may be utilized in a communication device 1502.
  • the communication device 1502 may be a UE or a base station.
  • the communication device 1502 includes a processor 1506 that controls operation of the communication device 1502.
  • the processor 1506 may also be referred to as a CPU.
  • ROM read-only memory
  • RAM random access memory
  • a portion of the memory 1508 may also include non-volatile random access memory
  • Instructions 1507b and data 1509b may also reside in the processor 1506. Instructions 1507b loaded into the processor 1506 may also include instructions 1507a from memory 1508 that were loaded for execution by the processor 1506. The instructions 1507 may be executed by the processor 1506 to implement the methods disclosed herein.
  • the communication device 1502 may also include a housing that contains a transmitter 1510 and a receiver 1512 to allow transmission and reception of data.
  • the transmitter 1510 and receiver 15 12 may be combined into a transceiver
  • An antenna 1518 is attached to the housing and electrically coupled to the transceiver 1520. Additional antennas may also be used.
  • the various components of the communication device 1502 are coupled together by a bus system 1526, which may include a power bus, a control signal bus, and a status signal bus, in addition to a data bus. However, for the sake of clarity, the various buses are illustrated in Figure 15 as the bus system 1526.
  • the communication device 1502 may also include a digital signal processor (DSP) 15 14 for use in processing signals.
  • DSP digital signal processor
  • the communication device 1502 may also include a communications interface 1524 that provides user access to the functions of the communication device 1502.
  • the communication device 1502 illustrated in Figure 15 is a functional block diagram rather than a listing of specific components .
  • the present invention may provide a user equipment (UE) for reduced power amplifier transmission.
  • the user equipment e .g. UE702
  • the user equipment comprises: multiple antennas (e . g. antennas 708a and 708b) transmitting and receiving signals, and multiple power amplifiers (e . g. 746a and 746b) supporting multiple antenna transmission, wherein a subset of the multiple PAs are used to transmit uplink signals when the UE operates in a reduced power amplifier (PA) mode.
  • PA reduced power amplifier
  • the present invention may provide a method for reduced power amplifier transmission.
  • the method comprises steps of determining whether a user equipment (UE) (e . g. UE702) should operate in a reduced power amplifier (PA) mode, the user equipment supporting multiple antenna transmission via multiple power amplifiers; and using a subset of the multiple amplifiers (e.g. 746a and 746b) to transmit uplink signals when the UE operates in the reduced PA mode .
  • UE user equipment
  • PA reduced power amplifier
  • the present invention may provide an enhanced Node B (eNB) for reduced power amplifier transmission.
  • the eNB (e . g. eNB 104 / communication device 1502) comprises a unit (e . g.
  • a user equipment e . g. UE 102
  • a reduced power amplifier PA
  • a unit e . g. transmitter 1510 instructing the UE to transition to the reduced PA mode .
  • the methods disclosed herein comprise one or more steps or actions for achieving the described method .
  • the method steps and/ or actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of steps or actions is required for proper operation of the method that is being described, the order and/ or use of specific steps and/ or actions may be modified without departing from the scope of the claims.

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Abstract

A user equipment (UE) that supports multiple antenna transmission via multiple power amplifiers may operate in a reduced power amplifier (PA) mode. When operating in the reduced PA mode, a subset of the UE's power amplifiers are used to transmit uplink signals. A UE may send a preference signal to an e-Node B to request that the UE operate in the reduced PA mode.

Description

DESCRIPTION
TITLE OF INVENTION
SYSTEMS AND METHODS FOR REDUCED POWER AMPLIFIER TRANSMISSION
TECHNICAL FIELD
The present disclosure relates generally to wireless communication systems. More specifically, the present disclosure relates to systems and methods for providing a reduced power amplifier (PA) transmission mode .
BACKGROUND ART
Wireless communication systems have become an important means by which many people worldwide have come to communicate. A wireless communication system may provide communication for a number of mobile stations, each of which may be serviced by a base station .
The 3rd Generation Partnership Project, also referred to as "3GPP," is a collaboration agreement that aims to define globally applicable technical specifications and technical reports for third generation wireless communication systems. The 3GPP may define specifications for the next generation mobile networks, systems, and devices. In 3GPP specifications, a mobile station is typically referred to as a user equipment (UE) , and a base station is typically referred to as a Node B or an evolved Node B (eNB) .
3GPP Long Term Evolution (LTE) is the name given to a project to improve the Universal Mobile Telecommunications
System (UMTS) mobile phone or device standard to cope with future requirements. In one aspect, UMTS has been modified to provide support and specification for the Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN) . LTE-Advanced is the next generation of LTE.
In LTE release 8, the PUSCH (Physical Uplink Shared Channel) supports only one transmission mode, i. e. , one antenna mode . But in LTE-Advanced, the 3GPP is attempting to specify several transmission modes, i.e . , TxD (transmit diversity) , SU-MIMO (single user-MIMO) and MU-MIMO (multi- user-MIMO) for PUSCH . Supporting SU-MIMO in LTE- Advanced means that at least some UEs have to support two power amplifiers.
SUMMARY OF INVENTION
According to the present invention, there is provided a user equipment (UE) for reduced power amplifier transmission. The user equipment comprises : multiple antennas transmitting and receiving signals, and multiple power amplifiers supporting multiple antenna transmission, wherein a subset of the multiple PAs are used to transmit uplink signals when the UE operates in a reduced power amplifier (PA) mode. According to the present invention, there is provided a method for reduced power amplifier transmission. The method comprises steps of supporting multiple antenna transmission via multiple power amplifiers; and using a subset of the multiple amplifiers to transmit uplink signals when the UE operates in the reduced PA mode.
According to the present invention, there is provided an enhanced Node B (eNB) for reduced power amplifier transmission. The eNB comprises a unit determining that a user equipment (UE) should operate in a reduced power amplifier (PA) mode based on at least one of a preference signal received from the UE, capability information received from the UE, and eNB measurement results; and a unit instructing the UE to transition to the reduced PA mode .
The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS Figure 1 illustrates a system for reducing power consumption in a UE;
Figure 2 illustrates a method for reducing power consumption in a UE; Figure 3 illustrates one example of a reduced PA mode, namely a one antenna mode;
Figure 4 illustrates a UE that is configured to operate in the one antenna mode;
Figure 5 illustrates another example of a reduced PA mode, namely an antenna selection mode;
Figure 6 illustrates a UE that is configured to operate in the antenna selection mode;
Figure 7 illustrates another UE that is configured to operate in the antenna selection mode; Figure 8 illustrates another example of a reduced PA mode;
Figure 9 illustrates an example of a UE sending a preference signal to an eNB via MAC control signaling;
Figure 10 illustrates an example of a UE sending a preference signal via RRC connection re-establishment signaling;
Figure 1 1 illustrates an example of a UE sending a preference signal via UE capability transfer signaling;
Figure 12 illustrates an example of a UE sending a preference signal via a measurement report; Figure 13 illustrates an example of a UE sending a preference signal via NAS control signaling;
Figure 14 illustrates an example of a preference signal that may be sent from a UE to an eNB; and Figure 15 illustrates various components that may be utilized in a communication device.
DESCRIPTION OF EMBODIMENTS
The present disclosure relates to a "reduced power amplifier (PA) mode" for user equipment (UE) that supports multiple antenna transmission via multiple PAs. When operating in the reduced PA mode, a subset of the UE's power amplifiers are used to transmit uplink signals. Reducing the number of power amplifiers that are utilized by a UE may significantly reduce the amount of power that is consumed by the UE, and therefore extend the life of the UE's battery.
A user equipment (UE) is disclosed. The UE includes multiple power amplifiers. The UE also includes a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to support multiple antenna transmission via the multiple power amplifiers. The instructions are also executable to operate in a reduced power amplifier (PA) mode. A subset of the multiple PAs are used to transmit uplink signals when the UE operates in the reduced PA mode .
The reduced PA mode may be an uplink transmission mode . The uplink transmission mode may be a one antenna mode . Alternatively, the uplink transmission mode may be an antenna selection mode. Alternatively, the reduced PA mode may be a radio access technology (RAT) mode, and the RAT mode may be a Long Term Evolution (LTE) mode.
Only one of the multiple power amplifiers may be used when the UE operates in the reduced PA mode. Alternatively, more than one of the multiple power amplifiers may be used when the UE operates in the reduced PA mode .
The instructions may also be executable to send a preference signal to an e-Node B (eNB) . The preference signal may include a request for the UE to operate in the reduced PA mode. The preference signal may be sent via Media Access
Control (MAC) control signaling, via Radio Resource Control
(RRC) connection re-establishment signaling, via UE capability transfer signaling, via a measurement report, via
Non-Access Stratum (NAS) control signaling, etc. The preference signal may include at least one of UE type, battery status, and application type.
The instructions may also be executable to send capability information to an eNB via UE capability transfer signaling. The instructions may also be executable to implicitly send capability information to an eNB . The instructions may also be executable to create a preference signal based on evaluating reduced PA mode criteria. The reduced PA mode criteria may include pathloss information, battery status, an indicator of an E9 1 1 call, etc . A method that is implemented by a user equipment (UE) is disclosed. The method includes supporting multiple antenna transmission via multiple power amplifiers. The method also includes operating in a reduced power amplifier (PA) mode, wherein a subset of the multiple PAs are used to transmit uplink signals when the UE operates in the reduced
PA mode . The reduced PA mode may be at least one of a one antenna mode, an antenna selection mode, and a Long Term Evolution (LTE) mode.
An enhanced Node B (eNB) is disclosed. The eNB includes a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to determine that a user equipment (UE) should operate in a reduced power amplifier (PA) mode based on at least one of a preference signal received from the UE, capability information received from the UE, and eNB measurement results . The instructions are also executable by the processor to instruct the UE to transition to the reduced PA mode .
For clarity, the systems and methods disclosed herein will be described using terminology from the 3GPP LTE and LTE-Advanced standards . However, the scope of the present disclosure should not be limited in this regard. The systems and methods may be utilized in other types of wireless communication systems. Figure 1 illustrates a system 100 for reducing power consumption in a UE 102. The UE 102 is an electronic device that may be used for voice and/ or data communication over a wireless communication network, such as a cellular network. The UE 102 may be a cellular phone, a smart phone, a personal digital assistant (PDA) , a card in a laptop or personal computer, etc.
An evolved Node B (eNB) .104 facilitates wireless communication between the UE 102 and a network. The eNB 104 is a fixed station that contains radio frequency transmitters and receivers that are used to communicate directly with UEs 102 , which may move freely around the eNB 104. Signals that are transmitted from the UE 102 to the eNB 104 are referred to as uplink signals, and signals that are transmitted from the eNB 104 to the UE 102 are referred to as downlink signals.
The UE 102 includes multiple power amplifiers 106 (e .g. PA 106a and PA 106b) and multiple transmit antennas 108. A first transmit antenna 108a and a second transmit antenna 108b are specifically shown in Figure 1 . A power amplifier (PA) 106 may be used to amplify a signal from a transmitter for transmission through a transmit antenna 108.
The scheduler 1 10 , capability information 1 12 , preference signal 1 14 , reduced PA mode criteria 1 16, and mode instructions 1 18 will be discussed below in connection with Figure 2.
Figure 2 illustrates a method 200 for reducing power consumption in a UE 102. The UE 102 supports S202 multiple antenna 108 transmission via the multiple PAs 106. However, the UE 102 is also capable of operating in a reduced PA mode, in which a subset of the multiple PAs 106 are used to transmit uplink signals. For example, only one of the PAs 106 may be used when the UE 102 operates in the reduced PA mode . Alternatively, more than one (but fewer than all) of the PAs 106 may be used when the UE 102 operates in the reduced PA mode . For example, if the UE 102 has four PAs
106, then the UE 102 may utilize one, two, or three PAs 106 when operating in the reduced PA mode .
The UE 102 may send S204 capability information 1 12 to the eNB 104. The capability information 1 12 may indicate to the eNB 104 that the UE 102 is capable of operating in the reduced PA mode . The scheduler 1 10 at the eNB 104 may decide whether or not the UE 102 operates in the reduced PA mode . Under some circumstances, the UE 102 may send S206 a preference signal 1 14 to the eNB 104. The preference signal 1 14 may include a request for the UE 102 to operate in the reduced PA mode . The UE 102 may create the preference signal 1 14 based on evaluating reduced PA mode criteria 1 16
(this will be discussed in greater detail below) . Also, as part of deciding whether the UE 102 should operate in the reduced PA mode, the eNB 104 may measure S208 channel conditions.
At some point, the eNB scheduler 1 10 may determine
2 10 that the UE 102 should operate in the reduced PA mode .
This decision may be based on the capability information 1 12 , the preference signal 1 14 , and/ or the results from the eNB's 104 measurement S208 of channel conditions. The eNB scheduler 1 10 may then instruct 2 12 the UE 102 to transition to the reduced PA mode . This may involve sending a mode instruction 1 18 to the UE 102. In response, the UE 102 may operate 2 14 in the reduced PA mode . Figure 3 illustrates one example of a reduced PA mode, namely a one antenna mode 320. A UE 302 may be capable of operating in multiple uplink transmission modes 318, including the one antenna mode 320, as well as a transmit diversity mode 322 , an open loop SU-MIMO (single-user multiple-input multiple-output) mode 324, a closed loop SU-
MIMO mode 326, a MU-MIMO (multiple-user MIMO) mode 328, etc. An eNB 304 may configure the UE 302 to operate in a particular uplink transmission mode 3 18 via RRC (radio resource control) signaling 330, similar to the procedure for the release 8 LTE downlink. Figure 4 illustrates a UE 402 that is configured to operate in the one antenna mode 320. The UE 402 may include a scrambling component 432 , a modulation mapper 434 , a transform precoder 436, a resource element mapper 438, an SC-FDMA signal generator 440, a digital-to-analog
(D/A) converter 442 , a radio frequency (RF) component 444 , a PA 406, and a transmit antenna 408.
In the one antenna mode 320, the UE 402 uses only one D/A converter 442 , one RF component 444, one PA 406 , and one antenna 408 to transmit uplink signals. This is true even if the UE 402 has more than one D /A converter 442 , more than one RF component 444 , more than one PA 406, and/ or more than one antenna 408.
Figure 5 illustrates another example of a reduced PA mode, namely an antenna selection mode 546. A UE 502 may be capable of operating in multiple uplink transmission modes 5 18, including the antenna selection mode 546, as well as a transmit diversity mode 522 , an open loop SU-MIMO mode 524 , a closed loop SU-MIMO mode 526, a MU-MIMO mode 528, etc . An eNB 504 may configure the UE 502 to operate in a particular uplink transmission mode 5 18 via RRC signaling 530.
Figure 6 illustrates a UE 602 that is configured to operate in the antenna selection mode 546. The UE 602 includes a scrambling component 632 , a modulation mapper 634 , a transform precoder 636, a resource element mapper 638, an SC-FDMA signal generator 640, a D /A converter 642 , an RF component 644 , a PA 606, an antenna switching module (antenna switch) 648, and first and second transmit antennas 608a, 608b.
In the antenna selection mode 546, the UE 602 may use only one D /A converter 642 , one RF component 644, one PA 606, and one antenna 608 to transmit uplink signals. This may be true even though the UE 602 has more than one antenna 608a, 608b. The UE 602 may switch the antenna
608a, 608b that is used to transmit uplink signals via the antenna switching module 648.
Figure 7 illustrates another UE 702 that is configured to operate in the antenna selection mode 546. The UE 702 includes a scrambling component 732 , a modulation mapper
734, a transform precoder 736, a resource element mapper
738, first and second SC-FDMA signal generators 740a, 740b, first and second D /A converters 742a, 742b, first and second
RF components 744a, 744b, first and second PAs 746a, 746b, and first and second antennas 708a, 708b.
In the antenna selection mode 546, the UE 702 may use multiple D /A converters 742a, 742b, multiple RF components
744a, 744b, multiple PAs 746a, 746b and multiple antennas
708a, 708b to transmit uplink signals. However, the UE 702 may only use one D /A converter 742 , one RF component 744 , one PA 746, and one antenna 708 during a subframe. An antenna switch signal 750 may be applied to the resource element mapper 738 to determine whether the first set of components 740a, 742a, 744a, 746a, 708a or the second set of components 740b, 742b, 744b, 746b, 708b is used.
The UE 702 configuration shown in Figure 7 requires the rapid on and off of PAs 746. Thus, the UE 702 configuration shown in Figure 7 is suitable for dynamic switching, whereas the UE 602 configuration shown in Figure 6 is suitable for semi-static switching.
Figure 8 illustrates another example of a reduced PA mode . In the example that is shown in Figure 8, the reduced PA mode is a radio access technology (RAT) mode 854. More specifically, the reduced PA mode is an LTE mode 856 (i. e. , LTE Release 8) . When operating in LTE mode 856, the UE 802 uses only one transmit antenna to transmit uplink signals. Thus, in order to cause the UE 802 to operate in the reduced PA mode, the eNB 804 may ask the UE 802 to transition from LTE-Advanced mode 858 or UTRA mode 860 (or another mode) to LTE mode 856. The UE 802 is configured to support these types of transitions. The process may be similar to the usual inter-RAT handover between LTE-Advanced 858 and LTE 856. Both the downlink and the uplink transition to LTE mode 856 in this case, but the UE 802 can have the benefit of longer battery life through this transition. Figure 8 shows the eNB 804 sending a transition request 852 to the UE 802.
As discussed above in connection with Figure 1 , a UE 102 may send a preference signal 1 14 to an eNB 104. The preference signal 1 14 may include a request for the UE 102 to operate in the reduced PA mode. There are many different ways for a UE 102 to send a preference signal 1 14 to an eNB 104. For example, the preference signal 1 14 may be sent via higher layer signaling, such as Media Access Control (MAC) control signaling, via RRC connection re-establishment signaling, via UE capability transfer signaling, via a measurement report, via NAS (Non-Access Stratum) control signaling, etc.
Figure 9 illustrates an example of a UE 902 sending a preference signal 1 14 to an eNB 904 via MAC control signaling 962. The UE 902 may send the battery status (e.g. , battery voltage, remaining battery charge, current flow given battery type, etc. ) as a preference signal 1 14 via MAC control signaling 962. The eNB scheduler 1 10 chooses the appropriate uplink transmission mode 3 18, taking into account the traffic load and channel state information as well as the battery status that it received from the UE 902. The eNB 904 sends the selected uplink transmission mode 3 18 to the UE 902 via RRC information elements 964.
Figure 10 illustrates an example of a UE 1002 sending a preference signal 1 14 via RRC connection re-establishment signaling. A UE 1002 may send a request for handover from LTE-Advanced mode 858 to LTE mode 856 as a preference signal 1 14 via an RRCConnectionRequest message 1068. The eNB scheduler 1 10 chooses the appropriate RAT mode 854 , taking into account the traffic load and channel state information as well as the request that was received from the UE 1002. The UTRAN (UMTS Terrestrial Radio Access Network) 1066 may send an RRCConectionSetup message 1070 to the UE 1002 to cause the handover to the LTE mode 856 to occur. After the RAT handover, the UE 1002 may send an RRCConnectionSetupComplete message 1072 to the UTRAN 1066.
Figure 1 1 illustrates an example of a UE 1 102 sending a preference signal 1 14 via UE capability transfer signaling. First, an eNB 1 104 may send a UECapabilityEnquiry message
1 174 to the UE 1 102. Second, the UE 1 102 may send a UECapabilitylnformation message 1 176 to the eNB 1 104. The UECapabilitylnformation message 1 176 may include the UE type (e. g. , handset, PC, etc. ) and/ or the battery status (e .g. , battery voltage, etc. ) as a preference signal 1 14. Third, the eNB scheduler 1 10 may choose the appropriate UL transmission mode 3 18 , taking into account the traffic load and channel state information as well as the UE type and battery status received from the UE 1 102. The eNB 1 104 and the UE 1 102 may repeat the first three steps periodically. The eNB 1 104 may send the selected UL transmission mode 318 via RRC information elements 1 178.
Figure 12 illustrates an example of a UE 1202 sending a preference signal 1 14 via a measurement report. The EUTRAN (Evolved UTRAN) 1280 may set up a battery status reporting threshold, a timer period value, etc . , via an RRCConnectionReconfiguration message 1282. The UE 1202 may send an RRCConectionReconfigurationComplete message 1284 to the EUTRAN 1280. The battery status reporting threshold, the timer period value, etc . may be used as a trigger for sending a measurement report 1286. The UE 1202 may send a battery status report as a measurement report 1286 when the battery voltage becomes lower than the configured battery status reporting threshold or the timer period has expired.
Figure 13 illustrates an example of a UE 1302 sending a preference signal 1 14 via NAS control signaling 1388. The UE 1302 may send the UE type (e . g. , handset, PC, etc.) and / or the battery status (e.g. , battery voltage, etc .) as a preference signal 1 14 via NAS control signaling 1388. The eNB scheduler 1 10 may choose the appropriate UL transmission mode 3 18, taking into account the traffic load and channel state information as well as the UE type and/ or the battery status received from the UE 1302. The eNB 104 (as part of the EUTRAN 1380) may send the selected UL transmission mode 3 18 via RRC information elements 1390.
As discussed above in connection with Figure 1 , a UE 102 may send capability information 1 12 to an eNB 104. The capability information 1 12 may indicate to the eNB 104 that the UE 102 is capable of operating in the reduced PA mode .
It may be desirable to send capability information 1 12 to the eNB 104 because some UEs 102 may not support the reduced PA mode . The capability information 1 12 may be sent via UE capability transfer signaling, which was discussed above in connection with Figure 1 1 . The capability information 1 12 may be included in the UECapabilitylnformation 1 176 message .
Alternatively, the capability information 1 12 may be sent via implicit signaling. For example, a UE 102 may indicate to the eNB 104 via UE capability transfer signaling that the UE
102 is capable of supporting multiple PAs 106. In addition, the UE 102 may send the battery status to the eNB 104 by using MAC control signaling, RRC connection re- establishment signaling, UE capability transfer signaling, or NAS control signaling.
Figure 14 illustrates an example of a preference signal
14 14 that may be sent from a UE 102 to an eNB 104. A preference signal 1414 may include the UE type 1492. The
UE type 1492 may be, for example, a handset, a PDA, a PC, etc. A preference signal 14 14 may also include the battery status 1494. The battery status 1494 may indicate whether the UE 102 has a low battery or not. Alternatively, the battery status 1494 may be a value indicating the battery's present charge . A preference signal 1414 may also include an application type 1496. The application type 1496 may indicate whether the application that is being used by the UE 102 is a voice application, a data application, an E9 1 1 call, etc. An E9 1 1 signal may be considered to be a preference signal 14 14 because it may be beneficial to have a longer battery life when a UE 102 calls to E9 1 1 .
A preference signal 1414 may include channel conditions 1497. The channel conditions 1497 may include rank . information (e. g. , Rank l , more than Rank2 , etc.) . The channel conditions 1497 may also include pathloss information (e .g. , whether the difference between downlink signal reception levels for different antennas exceeds a threshold or not) . A preference signal 1414 may also include embedded sensor information 1498. For example, a UE 102 may include an accelerometer, in which case the embedded sensor information 1498 may indicate whether the UE 102 is in the horizontal position (landscape mode) , the vertical position (portrait mode) , etc . A preference signal 14 14 may also include a user's command 1499 , such as whether the user has requested a longer battery mode (e .g. , through a user interface) . As indicated above, a UE 102 may create a preference signal 1 14 based on evaluating reduced PA mode criteria 1 16. Several examples of this will now be discussed.
In one example, if the UE type 1492 is "handset" and the battery status 1494 is "low battery" (which may be automatically determined in the manner in which low battery indicators are present in currently deployed cellular phones) , then the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers to transmit in the reduced PA mode. In this case, the UE 102 may have only limited battery capacity and the battery may be almost running out.
In another example, if the UE type 1492 is "handset" and the user's command 1499 is "longer battery mode ," then the UE 102 may send a preference signal 1 14 that tells the eNB
104 that the UE 102 prefers the reduced PA mode . In this case, the UE 102 may have only limited battery capacity and the user may want to have a longer battery life rather than a high data rate. In another example, if the UE type 1492 is "handset" and the channel conditions 1497 are "Rank l ," then the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode . In this case, the UE 102 may have only limited battery capacity and either antenna 108 on the UE 102 may be covered by the user's hand.
In another example, if the UE type 1492 is "handset" and pathloss information (which may be included in channel conditions 1497) indicates that the difference between the reception level between antennas 108 exceeds a given threshold, then the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode . In this case, the UE 102 may have only limited battery capacity and either antenna 108 on the UE 102 may be covered by the hand or similarly obstructed.
In another example, if the UE type 1492 is "PDA" and the application type 1496 is "voice," then the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode. For example, if the UE type 1492 is "PDA" and the application type 1496 is "voice" and pathloss information (which may be included in channel conditions 1497) indicates that the difference between the reception level between antennas 108 exceeds a given threshold, then the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode . If the user will hold the UE 102 in a different style depending on its application (e . g. , a vertical style during a voice connection and a horizontal style during a data connection) , the preference signal 1 14 may indicate that one of the antennas 108 on the UE 102 is covered by the user's hand or is otherwise obstructed. In this case , the reduced PA mode may be beneficial from the perspective of longer battery life .
In another example, if the UE type 1492 is "PDA" and the accelerometer indicates "vertical mode" (via embedded sensor information 1498) , then the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode . Similar to the above case , if the user will hold the UE 102 in a different style depending on its application (e. g. , a vertical style during a voice connection and a horizontal style during a data connection) , the preference signal 1 14 may indicate that one of the antennas 108 on the UE 102 is covered by the user's hand or is otherwise obstructed. In another example, if the UE type 1492 is "PC (e .g. , as in laptop cards) , then the UE 102 may not send a preference signal 1 14 or the UE 102 may send a preference signal 1 14 that tells the eNB 104 that the UE 102 does not prefer the reduced PA mode. This may be because a PC has a large battery or can connect to a power outlet. On the other hand, if the laptop is on battery power, and the internal detector in the laptop indicates "low battery," then signaling may be initiated to go into the reduced PA mode .
As indicated above, as part of deciding whether a UE 102 should operate in the reduced PA mode, an eNB 104 may measure 208 channel conditions. This may be accomplished via receiving reference signals, e.g., demodulation reference signals, sounding reference signals, etc. For example, an eNB 104 may measure rank information, e.g., Rankl, more than Rank2, conditioning information (e.g., the ratio of the highest to lowest values of the channel matrix), etc. Also, an eNB 104 may measure CQI (channel quality information), PMI (precoding matrix indexes), pathloss information (e.g., whether the difference between downlink signal reception levels for different antennas 108 exceeds a threshold or not), etc. An eNB 104 may also measure the UE's 102 application type 1496 (e.g., voice, data, etc.).
As indicated above, the eNB scheduler 110 may determine 210 whether a UE 102 should operate in reduced PA mode. In making this determination, the eNB scheduler
110 may take into account a preference signal 114 received from the UE 102, capability information 112 received from the UE 102, eNB 104 measurement results, traffic information (for the cell and/or for the UE 102), etc. Several examples of this will now be discussed.
In one example, the eNB scheduler 110 may select the reduced PA mode for a UE 102 when the UE 102 sends a preference signal 114 that tells the eNB 104 that the UE 102 prefers reduced PA mode. In this case, the preference signal 114 directly affects the behavior of the eNB scheduler 110. In another example, the eNB scheduler 1 10 may add a reduced PA mode (e.g. , one antenna mode 320, antenna selection mode 546) and remove the transmit diversity mode 322 for a UE 102 to the set of transmission mode candidates when the UE 102 sends a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode. Then, the eNB scheduler 1 10 may select the appropriate transmission mode 318 based on eNB 104 measurement results, e .g. , CQI , PMI , rank information and/ or pathloss. In this case, the preference signal 1 14 may provide the function of narrowing down the eNB scheduler's 1 10 choice of transmission modes 3 18.
In another example, the eNB scheduler 1 10 may select the reduced PA mode for a UE 102 when the UE 102 sends a preference signal 1 14 that tells the eNB 104 that the UE 102 prefers the reduced PA mode and pathloss information in the eNB 104 measurement results indicates that the difference between the UE's 102 antenna levels exceeds a given threshold. In this case, either antenna 108 on the UE 102 may be covered by the user's hand or may be otherwise obstructed so that the eNB scheduler 1 10 may select the reduced PA mode.
In another example, the eNB scheduler 1 10 may select the reduced PA mode for a UE 102 when the UE's 102 traffic is voice traffic and the pathloss information in the eNB 104 measurement results indicates that the difference between the UE's 102 antenna levels exceeds a given threshold.
In another example, the eNB scheduler 1 10 may select the reduced PA mode for a UE 102 when the UE 102 sends a preference signal 1 14 that indicates to the eNB 104 that the
UE 102 prefers the reduced PA mode, the cell traffic is low, and the pathloss information in the eNB 104 measurement results indicates that the difference between the UE's 102 antenna levels exceeds a given threshold. Figure 15 illustrates various components that may be utilized in a communication device 1502. The communication device 1502 may be a UE or a base station. The communication device 1502 includes a processor 1506 that controls operation of the communication device 1502. The processor 1506 may also be referred to as a CPU. Memory
1508 , which may include both read-only memory (ROM) , random access memory (RAM) or any type of device that may store information, provides instructions 1507a and data 1509a to the processor 1506. A portion of the memory 1508 may also include non-volatile random access memory
(NVRAM) . Instructions 1507b and data 1509b may also reside in the processor 1506. Instructions 1507b loaded into the processor 1506 may also include instructions 1507a from memory 1508 that were loaded for execution by the processor 1506. The instructions 1507 may be executed by the processor 1506 to implement the methods disclosed herein.
The communication device 1502 may also include a housing that contains a transmitter 1510 and a receiver 1512 to allow transmission and reception of data. The transmitter 1510 and receiver 15 12 may be combined into a transceiver
1520. An antenna 1518 is attached to the housing and electrically coupled to the transceiver 1520. Additional antennas may also be used.
The various components of the communication device 1502 are coupled together by a bus system 1526, which may include a power bus, a control signal bus, and a status signal bus, in addition to a data bus. However, for the sake of clarity, the various buses are illustrated in Figure 15 as the bus system 1526. The communication device 1502 may also include a digital signal processor (DSP) 15 14 for use in processing signals. The communication device 1502 may also include a communications interface 1524 that provides user access to the functions of the communication device 1502.
The communication device 1502 illustrated in Figure 15 is a functional block diagram rather than a listing of specific components .
According to the above disclosure, the present invention may provide a user equipment (UE) for reduced power amplifier transmission. The user equipment (e .g. UE702) comprises: multiple antennas (e . g. antennas 708a and 708b) transmitting and receiving signals, and multiple power amplifiers (e . g. 746a and 746b) supporting multiple antenna transmission, wherein a subset of the multiple PAs are used to transmit uplink signals when the UE operates in a reduced power amplifier (PA) mode.
According to the above disclosure , the present invention may provide a method for reduced power amplifier transmission. The method comprises steps of determining whether a user equipment (UE) (e . g. UE702) should operate in a reduced power amplifier (PA) mode, the user equipment supporting multiple antenna transmission via multiple power amplifiers; and using a subset of the multiple amplifiers (e.g. 746a and 746b) to transmit uplink signals when the UE operates in the reduced PA mode . According to the above disclosure , the present invention may provide an enhanced Node B (eNB) for reduced power amplifier transmission. The eNB (e . g. eNB 104 / communication device 1502) comprises a unit (e . g. scheduler 1 10) determining that a user equipment (UE) (e . g. UE 102) should operate in a reduced power amplifier (PA) mode based on at least one of a preference signal received from the UE, capability information received from the UE, and eNB measurement results; and a unit (e . g. transmitter 1510) instructing the UE to transition to the reduced PA mode . The methods disclosed herein comprise one or more steps or actions for achieving the described method . The method steps and/ or actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of steps or actions is required for proper operation of the method that is being described, the order and/ or use of specific steps and/ or actions may be modified without departing from the scope of the claims.
It is to be understood that the claims are not limited to the precise configuration and components illustrated above.
Various modifications, changes and variations may be made in the arrangement, operation and details of the systems, methods, and apparatus described herein without departing from the scope of the claims.

Claims

1 . A user equipment (UE) , comprising: multiple antennas transmitting and receiving signals, and multiple power amplifiers (PAs) supporting multiple antenna transmission, wherein a subset of the multiple PAs are used to transmit uplink signals when the UE operates in a reduced power amplifier (PA) mode.
2. The UE of claim 1 , wherein the reduced PA mode is an uplink transmission mode, and wherein the uplink transmission mode is a one antenna mode.
3. The UE of claim 1 , wherein the reduced PA mode is a radio access technology (RAT) mode , and wherein the RAT mode is a Long Term Evolution (LTE) mode .
4. The UE of claim 1 , wherein only one of the multiple power amplifiers is used when the UE operates in the reduced PA mode.
5. The UE of claim 1 , wherein more than one of the multiple power amplifiers are used when the UE operates in the reduced PA mode.
6. The UE of claim 1 , wherein the UE sends a preference signal to an e-Node B (eNB) , wherein the preference signal comprises a request for the UE to operate in the reduced PA mode.
7. The UE of claim 6, wherein the preference signal is sent via one of a group consisting of Media Access Control (MAC) control signaling, Radio Resource Control (RRC) connection re-establishment signaling, UE capability transfer signaling, a measurement report and Non-Access Stratum (NAS) control signaling.
8. The UE of claim 6, wherein the preference signal comprises at least one of UE type, battery status, and application type .
9. The UE of claim 1 , wherein the UE sends capability information to an e-Node B (eNB) via UE capability transfer signaling.
10. The UE of claim 1 , wherein the UE implicitly sends capability information to an e-Node B (eNB) .
1 1 . The UE of claim 1 , wherein a preference signal is created based on evaluating reduced PA mode criteria.
12. The UE of claim 1 1 , wherein the reduced PA mode criteria comprises at least one of pathloss information, battery status and an indicator of an E9 1 1 call.
13. A method for reduced power amplifier transmission, comprising: supporting multiple antenna transmission via multiple power amplifiers (PAs) ; and using a subset of the multiple power amplifiers to transmit uplink signals when a user equipment (UE) operates in the reduced PA mode.
14. The method of claim 13 , wherein the reduced PA mode is at least one of a one antenna mode, an antenna selection mode, and a Long Term Evolution (LTE) mode.
15. An enhanced Node B (eNB) comprising: a unit determining that a user equipment (UE) should operate in a reduced power amplifier (PA) mode based on at least one of a preference signal received from the UE, capability information received from the UE, and eNB measurement results; and a unit instructing the UE to transition to the reduced PA mode .
16. The eNB of claim 15, further comprising a unit measuring channel conditions.
PCT/JP2010/059885 2009-06-19 2010-06-04 Systems and methods for reduced power amplifier transmission WO2010147051A1 (en)

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EP10789426.3A EP2443879A4 (en) 2009-06-19 2010-06-04 Systems and methods for reduced power amplifier transmission
CN201080026840.5A CN102804865B (en) 2009-06-19 2010-06-04 For reducing the system and method that power amplifier sends
JP2011553197A JP5697610B2 (en) 2009-06-19 2010-06-04 System and method for transmission with reduced number of power amplifiers
MX2011012776A MX2011012776A (en) 2009-06-19 2010-06-04 Systems and methods for reduced power amplifier transmission.
KR1020127000094A KR101390550B1 (en) 2009-06-19 2010-06-04 Systems and methods for reduced power amplifier transmission

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