WO2011160506A1 - Procédé et dispositif de fixation d'une marge de puissance - Google Patents

Procédé et dispositif de fixation d'une marge de puissance Download PDF

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Publication number
WO2011160506A1
WO2011160506A1 PCT/CN2011/074057 CN2011074057W WO2011160506A1 WO 2011160506 A1 WO2011160506 A1 WO 2011160506A1 CN 2011074057 W CN2011074057 W CN 2011074057W WO 2011160506 A1 WO2011160506 A1 WO 2011160506A1
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WO
WIPO (PCT)
Prior art keywords
component carrier
pusch
power
user equipment
subframe
Prior art date
Application number
PCT/CN2011/074057
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English (en)
Chinese (zh)
Inventor
朱鹏
喻斌
杜忠达
Original Assignee
中兴通讯股份有限公司
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
Priority claimed from CN201010212113.XA external-priority patent/CN101883417B/zh
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2011160506A1 publication Critical patent/WO2011160506A1/fr

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Classifications

    • 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
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting

Definitions

  • the invention relates to the field of communications, and in particular, to a method and apparatus for setting a power headroom (PH).
  • uplink power control uplink power control, which can be simply referred to as uplink power control or power control
  • the transmit power of the Uplink Physical Channel to compensate for channel path loss and shadow fading and to suppress inter-cell interference.
  • the uplink physical channel of the uplink power control control includes a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a sounding reference signal (SRS).
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • SRS sounding reference signal
  • i is a natural number, "[]" the letters parameter units
  • the d is the Configured Maximum UE output power set by the UE, and the value range is determined by multiple parameters, including: the maximum UE power determined by the UE power class (the maximum UE power ), system configured IE P-Max (maximum configured power), maximum configured output power deviation (PCMAX tolerance), and maximum power reduction (MPR) and maximum power reduction (Other Maximum Power Reduction) , A-MPR), etc.
  • M PUSCH ( ) is the PUSCH bandwidth transmitted on the subframe i, and its value is represented by the number of resource blocks (RBs);
  • a PUSCH U; is an open loop power control parameter whose value is a cell specific amount - PUSCH /) and a UE specific (UE specific) amount P.
  • ⁇ is a cell-specific path loss compensation factor, which is configured by the upper layer.
  • the PL is a downlink path loss estimate measured and calculated at the UE side, and is used to estimate an uplink path loss;
  • ⁇ TF (/) is the power offset associated with the Transmission Format (TF) of the PUSCH transmitted on the subframe i; is the current power control adjustment state of the PUSCH.
  • /() f(il) + S PUSCH (iK PUSCH );
  • ( ) ⁇ P USCH ( - ⁇ P US CH » where 4 USCH is a UE-specific closed-loop correction value, also known as the transmit power control command ( TPC command )
  • the UE estimates the transmit power of the PUSCH according to the open loop and closed loop power control parameters, the command, the path loss estimate of the base station, and the number of resource blocks of the PUSCH transmitted on the subframe i:
  • ⁇ PUSCH 10 log 10 ( PUSCH () + P 0 PUSCH (j) + (j) ⁇ PL + ⁇ ⁇ (/) + (/) [dBm] to enable the base station to know a certain UE at a certain time
  • Power Headroom also known as power headroom
  • Table 1 is a mapping table of the quantized values of the power headroom and the index. As shown in Table 1, the Media Access Control Layer (MAC Layer) uses a 6-bit index to represent the quantized power headroom. The 6-bit index is also called the power headroom. Table 1 Mapping relationship between quantized values and indexes of power headroom
  • the Power Headroom Report is event-triggered.
  • the Power Headroom MAC Control Element and its MAC layer protocol data unit subheader (MAC PDU subheader).
  • the UE reports the 6-bit power headroom index to the base station through the power headroom MAC layer control unit.
  • MAC PDU subheader MAC layer protocol data unit subheader
  • the LTE-Advanced system (Evolved LTE System, also referred to as LTE-A system for short) is a next-generation evolution system of the LTE system.
  • FIG. 1 is a schematic diagram of carrier aggregation of an LTE-A system in the prior art. Such as shown in Figure 1, the LTE-A system uses carrier aggregation technology to extend the transmission bandwidth. Each aggregated carrier is called a component carrier.
  • the user equipment may transmit one PUSCH on one component carrier, or may simultaneously transmit multiple PUSCHs on multiple component carriers.
  • the scheduling of the PUSCH on each component carrier is independent, and the power control is also independent. Therefore, the prior art proposes that in the LTE-A system, the calculation of the power headroom is performed on the component carrier (CC specific PHR, or PHR per CC), that is, the user equipment separately calculates the power headroom of each component carrier.
  • the prior art also proposes that the power headroom of one component carrier can be reported to the base station on another component carrier, that is, the power headroom MAC layer control unit including one component carrier power headroom information can be on another component carrier.
  • the transmitted PUSCH is sent to the base station.
  • the power headroom report has been triggered by the event, and the current subframe has no new uplink data transmission on the component carrier. If the power headroom of a component carrier is limited to be reported on the component carrier, the current The sub-frame user equipment cannot report the power headroom; if the power headroom of one component carrier can be reported on another component carrier, and the current sub-frame user equipment has new uplink data transmission on another component carrier, the current The subframe user equipment can report the triggered power headroom on another component carrier.
  • the prior art defines two component carrier-based power lifting spaces calculated on the subframe i component carrier k, which are: power headroom type 1
  • Ppuscai k) 10 log 10 ( PUSCH (/, k)) + P o mscH (j, k) + a(j,k)-PL(k) + ⁇ ⁇ (/, ⁇ ) + f(i,k [dBm], where M puseH (, A:) is the bandwidth of the PUSCH expected to be transmitted on the subframe i component carrier k, the value of which is represented by the number of resource blocks RB; P° -PUSCH O) is based on the component
  • the path loss compensation factor of component carrier k is configured by the upper layer.
  • ⁇ 1 is the partial path loss compensation
  • ⁇ TF (») is the power offset associated with the transmission format of the PUSCH expected to be transmitted on the subframe i component carrier k; is the current power control adjustment state of the PUSCH on the component carrier k.
  • f(i, f(il) + ⁇ H (i - KH ); when it is the absolute value power control, USCT ⁇ _ PUSCH ).
  • the USCH is a UE-specific closed-loop correction value, also known as a transmit power control command (TPC command).
  • the second type of power headroom is defined only on component carriers that can transmit PUCCH.
  • the user equipment transmits the PUCCH only on one user equipment-specific (UE-specific) component carrier, and the component carrier is called a primary component carrier (PCC).
  • PCC primary component carrier
  • the second type of power headroom is defined only on the user equipment specific primary component carrier PCC.
  • the prior art also proposes that when calculating the power headroom based on the component carrier, power backoff is included.
  • the power backoff is related to many factors, including but not limited to: working frequency band, system bandwidth, modulation order, transmission bandwidth position, transmission bandwidth configuration, etc., and whether the PUSCH and the PUCCH are simultaneously transmitted with the PUSCH. related.
  • the range of power backoff can be controlled by Maximum Power Reduction (MPR).
  • MPR Maximum Power Reduction
  • the power backoff of the maximum transmit power is determined according to the configuration of the uplink signal, the configuration of the power amplifier (AP) of the transmitter, and the maximum power drop in the corresponding scenario specified by the standard.
  • the maximum transmit power set by the user equipment on the component carrier is smaller than the maximum transmit power configured by the base station on the component carrier.
  • the inventors have realized that the prior art has the following drawbacks: if the current subframe has no PUSCH transmission on the user equipment on a certain component carrier, or the current subframe is only heavy on the certain component carrier When the PUSCH is transmitted, the user equipment cannot calculate and report the power headroom.
  • SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a method and apparatus for setting a power headroom for calculating a power headroom based on a component carrier to solve a component carrier in a subframe that is not in the prior art.
  • a method for setting a power headroom is provided, if a user equipment does not have a physical uplink control channel PUSCH transmission or only retransmission on a subframe i component carrier k
  • the method includes: the user equipment calculates a power headroom of the subframe i component carrier k according to the preset evaluation parameter.
  • the evaluation parameter is one or more of the following parameters: a PUSCH bandwidth represented by the number of resource blocks, a power offset determined according to a transmission format of the PUSCH, an offset value, and a maximum transmit power of the component carrier k.
  • the evaluation parameters in the technical solution may be: a PUSCH bandwidth represented by the number of resource blocks; a power offset determined according to a transmission format of the PUSCH; and a maximum transmit power of the component carrier.
  • the user equipment is on the subframe i component carrier k, and the first type of power headroom is . among them,
  • ⁇ ( ) is the maximum transmit power of component carrier k
  • M PUSCHO is the PUSCH bandwidth represented by the number of resource blocks
  • p °-PUSCH A: ) is the open loop power control parameter based on component carrier k
  • the loss compensation factor is the downlink path loss estimate measured and calculated by the user equipment
  • ⁇ ' ⁇ ( ⁇ » is the power offset related to the PUSCH transmission format
  • is the PUSCH on the subframe i component carrier k is the offset value
  • the second type of power rise space is, Where 3 CM AX( ) is the maximum transmit power of component carrier k; P PUCCHO) is the transmit power of pucCH.
  • the evaluation parameter may be: an offset value and a maximum transmit power of the component carrier.
  • the user equipment is on the subframe i component carrier k
  • P CMAX (k) is the maximum transmit power of component carrier k
  • M PUSCHO is the PUSCH bandwidth expressed by the number of resource blocks
  • PUSCH transmission format related power offset is PUSCH on subframe i component carrier k
  • ⁇ is the offset value; or the second type of power rise space is, Where 3 CM AX ( ) is the maximum transmit power of component carrier k; P PUCCHO) is the transmit power of pucCH, when the user equipment transmits PUCCH on subframe i component carrier k, PpuccH ( z , k , is PUCCH Estimating the transmit power; or when the user equipment does not transmit PUCCH on the subframe i component carrier k, P PUCCH ( z ', k ) is the estimated transmit power of the PUCCH calculated by the user-set evaluation parameter; For PUSCH O) ⁇ P.
  • the maximum transmit power of the component carrier k has different values, that is, the corpse CMAX ( ) ⁇ cMAX ( ).
  • the PUSCH bandwidth represented by the number of resource blocks is determined according to the system bandwidth of the component carrier.
  • the PUSCH bandwidth is zero.
  • the power offset associated with the transmission format of the PUSCH is zero.
  • the offset value is determined according to the system bandwidth of the component carrier.
  • the offset value is 0.
  • the maximum transmit power of the component carrier is the maximum transmit power of the component carrier configured by the base station or the maximum transmit power of the component carrier set by the user equipment.
  • a device for setting a power headroom if there is no physical uplink control channel PUSCH transmission or only retransmission PUSCH transmission on a subframe i component carrier k, according to a preset one Or a plurality of evaluation parameters calculate a power headroom of the subframe i component carrier k.
  • the evaluation parameter is one or more of the following parameters: a PUSCH bandwidth represented by the number of resource blocks, a power offset determined according to a transmission format of the PUSCH, an offset value, and a maximum transmit power of the component carrier k.
  • the evaluation parameters are: a PUSCH bandwidth represented by the number of resource blocks; a power offset determined according to a transmission format of the PUSCH; and a maximum transmit power of the component carrier.
  • the evaluation parameters are: an offset value and a maximum transmit power of the component carrier.
  • the device for setting the power headroom is located on the user equipment side. In the present invention, when the user equipment does not transmit the PUSCH on one component carrier, or only the retransmission PUSCH is transmitted, the user equipment calculates the power headroom of the current component carrier based on a set of predefined parameters, thereby performing resource scheduling for the base station. And link adaptation provides timely power headroom information.
  • FIG. 1 is a schematic diagram of carrier aggregation of an LTE-A system in the prior art
  • FIG. 2 is a flowchart of a method for setting a power headroom according to an embodiment of the method of the present invention
  • FIG. 3 is a flowchart of an embodiment of the method according to the present invention. Flow chart of the method for setting the power up space.
  • FIG. 2 is a flowchart of a method for setting a power headroom according to an embodiment of the method of the present invention. As shown in FIG. 2, if the user equipment does not have a physical uplink control channel PUSCH transmission or only a retransmission PUSCH transmission on the subframe i component carrier k, the embodiment includes:
  • the user equipment calculates a power headroom of the subframe i component carrier k according to the preset evaluation parameter. In this embodiment, the user equipment calculates a power headroom of the subframe i component carrier k based on a set of predefined parameters, thereby providing timely power headroom information for resource scheduling and link adaptation of the base station.
  • i and k are merely serial numbers, and do not constitute a limitation of the present invention.
  • the concept of a virtual PUSCH is introduced.
  • FIG. 3 is a flowchart of a method for setting a power headroom according to Embodiment 2 of the method of the present invention. As shown in FIG.
  • Step S302 Defining a virtual PUSCH on the component carrier, and setting an evaluation parameter of the PUSCH
  • Step S304 Calculate the estimated transmit power of the virtual PUSCH by using the evaluation parameter
  • Step S306 Acquire the maximum transmit power of the component carrier
  • Step S308 Calculate the power rise space by using the maximum transmit power of the component carrier and the estimated transmit power of the virtual PUSCH.
  • the evaluation parameter may be a virtual PUSCH bandwidth represented by the number of resource blocks, and the virtual PUSCH bandwidth is determined by the system bandwidth of the component carrier.
  • the evaluation parameter is an offset value determined by the system bandwidth of the component carrier. Or the power offset determined according to the transmission format of the PUSCH. Or the maximum transmit power of the component carrier.
  • the evaluation parameters include a virtual PUSCH bandwidth represented by the number of resource blocks, a power offset determined according to a transmission format of the virtual PUSCH, and one or more of maximum transmit powers of the component carriers.
  • the evaluation parameter includes one or more of an offset value and a maximum transmit power of the component carrier.
  • the user equipment when the user equipment does not transmit the PUSCH on one component carrier, or only transmits the retransmission PUSCH, the user equipment calculates the current user equipment based on a set of predefined parameters.
  • the power of the carrier increases the space, thereby providing timely power up space information for the base station to perform resource scheduling and link adaptation.
  • Method Embodiment 3 When the user equipment does not transmit PUSCH on the subframe i component carrier k, or only retransmits PUSCH transmission, the virtual PUSCH is defined. In the following, two methods are used to calculate the estimated transmit power of the virtual PUSCH by using the preset evaluation parameters.
  • P. PUSai is an open-loop power control parameter based on the component carrier k, which is configured by the upper layer;
  • (j, k) is a path loss compensation factor based on the component carrier k, which is configured by the upper layer;
  • PJ(A) is a downlink path loss estimate measured and calculated by the user equipment end, and is used to estimate the uplink path loss of the component carrier k;
  • the estimated transmission power of the virtual PUSCH is: (1)
  • ⁇ PUSCH ⁇ ) 10 + ⁇ PUSCH (J, k) + a(j, k) ⁇ PL (k) + /(/, k) [dBm].
  • ⁇ PUSCH ⁇ ) 10 + 0 PUSCH (j, k) + a(j, k) ⁇ PL ⁇ k) + ⁇ ⁇ (/, k) + /(/, k) [dBm].
  • one of the evaluation parameters can be a preset offset value.
  • Method Embodiment 4 This embodiment will describe the calculation of two power headrooms.
  • P PuscH(0[ DBM ] is the estimated transmit power of the virtual pusCH, which may be the estimated transmit power of the virtual PUSCH determined according to the method in Embodiment 2.
  • P cMAx( k ) [dBm] is the component carrier k
  • the maximum transmit power can also be used as an evaluation parameter.
  • P eMAX (A:) [dBm] is the maximum transmit power of the component carrier k configured by the base station; or, P CMAX (k) [dBm] is set by the user equipment.
  • the maximum transmit power of the component carrier k set by the user equipment is determined by the relevant configuration of the virtual PUSCH. If the user equipment needs to calculate the second type of power rise on the subframe i component carrier k Space, the second type of power headroom of the user equipment in the subframe i component carrier k is
  • 5 CMAX (A:) [dBm] is the component carrier k of the base station configuration Maximum transmit power; or, 5 eMAX (A:) [dBm] is the maximum transmit power of the component carrier k set by the user equipment; preferably, when there is PUCCH transmission on the subframe i component carrier k, the component carrier set by the user equipment
  • the maximum transmit power of k is determined according to the relevant configuration of the virtual PUSCH and the PUCCH; when there is no PUCCH transmission on the subframe i component carrier k, the maximum transmit power of the component carrier k set by the user equipment is based on the correlation between the virtual PUSCH and the virtual PUCCH Configuration determined.
  • the maximum transmit power of the component carrier k takes a different value, that is, the corpse ⁇ ).
  • the steps of setting the power headroom in the embodiment are described in detail, The overall benefits of the first embodiment are more practical.
  • DEVICE EMBODIMENT One embodiment of the present invention discloses a device for setting a power headroom for assuming that there is no physical uplink control channel PUSCH transmission or only retransmission PUSCH transmission on a subframe i component carrier k, according to a preset one. Or a plurality of evaluation parameters calculate a power headroom of the subframe i component carrier k.
  • the evaluation parameter is one or more of the following parameters: a PUSCH bandwidth represented by the number of resource blocks, a power offset determined according to a transmission format of the PUSCH, an offset value, and a maximum transmit power of the component carrier k.
  • the evaluation parameters are: a PUSCH bandwidth represented by the number of resource blocks; a power offset determined according to a transmission format of the PUSCH; and a maximum transmit power of the component carrier.
  • the evaluation parameter may also be: an offset value and a maximum transmit power of the component carrier.
  • the apparatus for setting the power headroom may be located on the side of the user equipment.
  • the method implemented in this embodiment may refer to the related descriptions of the first to fourth embodiments of the method, and has all the effects of the foregoing embodiments, and is not repeatedly described herein.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de fixation d'une marge de puissance. Dans le procédé, lorsqu'un équipement utilisateur (UE) ne transmet pas un canal physique partagé de liaison montante (PUSCH) dans une porteuse de composantes ou ne transmet qu'un PUSCH retransmis dans une sous-trame courante, l'UE calcule la marge de puissance de l'UE dans la porteuse de composantes sur la base d'un ensemble de paramètres prédéfinis, fournissant ainsi en temps opportun des informations de marge de puissance pour l'ordonnancement des ressources et l'auto-adaptation des liaisons d'une station de base.
PCT/CN2011/074057 2010-06-23 2011-05-13 Procédé et dispositif de fixation d'une marge de puissance WO2011160506A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010212113.XA CN101883417B (zh) 2010-06-23 功率上升空间设置的方法及装置
CN201010212113.X 2010-06-23

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101340712A (zh) * 2007-07-06 2009-01-07 中兴通讯股份有限公司 多载波增强上行接入系统的调度信息上报方法
CN101340622A (zh) * 2007-07-06 2009-01-07 中兴通讯股份有限公司 多载波增强上行链路功率资源的分配方法
US20090258666A1 (en) * 2008-03-20 2009-10-15 Interdigital Patent Holdings, Inc. Method and apparatus for selecting enhanced dedicated channel transport format combination in cell_fach state and idle mode
CN101883417A (zh) * 2010-06-23 2010-11-10 中兴通讯股份有限公司 功率上升空间设置的方法及装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101340712A (zh) * 2007-07-06 2009-01-07 中兴通讯股份有限公司 多载波增强上行接入系统的调度信息上报方法
CN101340622A (zh) * 2007-07-06 2009-01-07 中兴通讯股份有限公司 多载波增强上行链路功率资源的分配方法
US20090258666A1 (en) * 2008-03-20 2009-10-15 Interdigital Patent Holdings, Inc. Method and apparatus for selecting enhanced dedicated channel transport format combination in cell_fach state and idle mode
CN101883417A (zh) * 2010-06-23 2010-11-10 中兴通讯股份有限公司 功率上升空间设置的方法及装置

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