CN104918312A - Method of controlling signal transmission power and device for controlling signal transmission power - Google Patents

Abstract

The present invention provides a method of controlling signal transmission power and a device for controlling signal transmission power. The present invention relates to a wireless communication system. Specifically, the present invention relates to a signal transmission method in which a terminal transmits a signal in a wireless communication system, the method comprising the steps of: checking maximum transmission power (P_CC_MAX) for each component carrier wave of a plurality of component carrier waves, and maximum transmission power (P_UE_MAX) of the terminal; calculating transmission power for each of a plurality of channels to be simultaneously transmitted to a base station through one or more component carrier waves; independently adjusting the transmission power for each of the plurality of channels so as not to exceed the maximum transmission power (P_CC_MAX) and the maximum transmission power (P_UE_MAX); and transmitting a signal to the base station through the plurality of channels for which the transmission power is adjusted.

Description

For method and the device thereof of control signal transmitted power

Application for a patent for invention (the international application no: PCT/KR2010/000510 of the application to be original bill application number be 201080005813.X, the applying date: on January 28th, 2010, denomination of invention: method and device thereof for control signal transmitted power) divisional application.

Technical field

The present invention relates to wireless communication system, more particularly, the present invention relates to the method and apparatus for controlling uplink transmission power.

Background technology

Extensively adopt wireless communication system, to provide various types of communication service, as voice or data.Usually, wireless communication system is can by sharing the multi-address system that free system resources (bandwidth, transmitted power etc.) is supported to carry out with multi-user communicating.The example of multi-address system comprises code division multiple access (CDMA) system, frequency division multiple access (FDMA) system, time division multiple access (TDMA) system, OFDM (OFDMA) system, single-carrier frequency division multiple access (SC-FDMA) system, multi-carrier frequency division multiple access (MC-FDMA) system etc.

Summary of the invention

Technical problem

The method and apparatus of transmitted power is efficiently controlled when an object of the present invention is to provide for sending multiple signal in a wireless communication system.

The method and apparatus of transmitted power is efficiently controlled when the transmitted power sum of signal exceedes maximum transmit power when another object of the present invention is to provide for sending multiple signal in a wireless communication system.

The technical problem to be solved in the present invention is not limited to above-mentioned technical problem, and the other technologies problem that those skilled in the art do not mention above can being expressly understood according to description below.

Technical scheme

In one aspect of the invention, a kind of method for sending signal in a wireless communication system comprises the following steps: the transmitted power determining the first channel and second channel independently; If the transmitted power sum of the first and second channels has exceeded maximum transmit power, then consider channel priority, reduce at least one transmitted power in the transmitted power of the first and second channels; And send signal to base station by the first and second channels simultaneously.

In another aspect of the present invention, subscriber equipment (UE) comprises radio frequency (RF) unit, and this radio frequency unit is used for sending wireless signal to base station (BS) and receiving wireless signal from base station (BS); Memory, this memory is for storing to the information of BS transmission, from the information of BS reception and the parameter of UE action need; And processor, this processor is connected to RF unit and memory, and is constructed to control RF unit and memory, and to operate UE, wherein, the transmitted power of the first channel and second channel independently determined by processor; If the transmitted power sum of the first and second channels has exceeded maximum transmit power, then consider channel priority, reduce at least one transmitted power in the transmitted power of the first and second channels; And send signal to base station by the first and second channels simultaneously.

Each channel in first and second channels can comprise one or more single-carrier frequency division multiple access (SC-FDMA) symbol.Meanwhile, can consider that at least one in channel type or channel information is to determine channel priority.Each channel can comprise in Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH) or detection reference signal (SRS) any one.

If the first channel and second channel are all PUSCH, then can consider to send form, re-transmission/non-re-transmission or number of retransmissions to determine channel priority.If reduce the transmitted power of PUSCH, then consider the quantity of power reduced, the modulation and encoding scheme (MCS) that are applied to this PUSCH can be controlled as low value.If the first channel is the PUCCH sending ACK, and second channel is PUSCH, then can distribute high channel priority to PUSCH.

In another aspect of the present invention, for sending the method for signal at subscriber equipment (UE) in a kind of wireless communication system, the method comprises the following steps: confirm the maximum transmit power (P_CC_MAX) of each component carrier in multiple component carrier and the maximum transmit power (P_UE_MAX) of described UE; Calculating is scheduled as the multiple channels transmitted power separately simultaneously sent to base station (BS) by one or more component carrier; Regulate the described transmitted power of described multiple channel independently, to be no more than described P_CC_MAX and described P_UE_MAX; And send signal by the described multiple channel that have adjusted described transmitted power to described BS.

In another aspect of the present invention, subscriber equipment (UE) comprises radio frequency (RF) unit, and this radio frequency unit is used for sending wireless signal to base station (BS) and receiving wireless signal from base station (BS); Memory, this memory for store send to described BS information, from the information received to described BS and the parameter operated needed for described UE; And processor, this processor is connected to described RF unit and described memory, and be constructed to control described RF unit and described memory, to operate described UE, wherein, described processor: confirm the maximum transmit power (P_CC_MAX) of each component carrier in multiple component carrier and the maximum transmit power (P_UE_MAX) of described UE; Calculating is scheduled as the multiple channels transmitted power separately simultaneously sent to base station (BS) by one or more component carrier; Regulate the described transmitted power of described multiple channel independently, to be no more than described P_CC_MAX and described P_UE_MAX; And send signal by the described multiple channel that have adjusted described transmitted power to described BS.

For arranging the information of described P_CC_MAX and the information for arranging described P_UE_MAX can be sent with signal by broadcast or wireless heterogeneous networks (RRC) message.

The adjustment of the described transmitted power of described multiple channel can comprise the transmitted power reducing each channel independently, makes the transmitted power sum of described multiple channel be no more than described P_UE_MAX; And after the transmitted power reducing each channel, reduce the transmitted power of the respective channel of each component carrier independently, make the transmitted power sum of described respective channel be no more than corresponding P_CC_MAX.In this case, the power reduced from described respective channel at least partially for increasing the transmitted power of other component carriers.

The adjustment of the described transmitted power of described multiple channel can comprise the transmitted power of the respective channel reducing each component carrier independently, makes the transmitted power sum of described respective channel be no more than corresponding P_CC_MAX; And after the transmitted power reducing each channel, the independent transmitted power reducing each channel, makes the transmitted power sum of described multiple channel be no more than described P_UE_MAX.

The adjustment of the described transmitted power of described multiple channel can comprise attenuation coefficient is applied to each channel independently.

Each channel in described channel can comprise one or more single-carrier frequency division multiple access (SC-FDMA) symbol.In this case, each channel in described channel can comprise in Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH) or detection reference signal (SRS) any one.

In another aspect of the present invention, the method for one in a wireless communication system for sending signal at subscriber equipment (UE) comprises the following steps: the transmitted power calculating each antenna in many antennas; If the transmitted power calculated has exceeded the maximum transmit power of respective antenna, then calculate transmitted power attenuation ratio; By the maximum attenuation in described transmitted power attenuation ratio than being applied to described many antennas comparably; And send signal by described alignment base station, many skies (BS).

Technique effect

According to an illustrative embodiment of the invention, efficiently transmitted power can be controlled when sending multiple signal in a wireless communication system.And, efficiently can control transmitted power when the transmitted power sum of signal has exceeded maximum transmit power.

Accompanying drawing explanation

Accompanying drawing is included to provide a further understanding of the present invention, and it is merged in and forms a application's part, and accompanying drawing shows embodiments of the present invention, and is used from specification one and explains principle of the present invention.In accompanying drawing:

Fig. 1 shows the network configuration of evolved universal mobile communication system (E-UMTS);

The structure of the Radio interface protocols between Fig. 2 shows based on UE and E-UTRAN of 3GPP wireless access network standard;

Fig. 3 shows the block diagram of transmitter for OFDMA and SC-FDMA and receiver;

Fig. 4 shows the structure of the radio frames used in LTE system;

Fig. 5 shows the example of executive communication in simple component carrier environment;

Fig. 6 A shows the structure of the UL subframe used in LTE system;

Fig. 6 B shows the structure of the UL control channel used in LTE system;

Fig. 7 shows the example of executive communication in multiple component carriers environment;

Fig. 8 shows exemplary transmission power control according to the embodiment of the present invention;

Fig. 9 shows the example of the multiple signal of transmission according to the embodiment of the present invention;

Figure 10 shows the example when limiting maximum transmit power in units of one or more component carrier according to the control transmitted power of embodiment of the present invention;

Figure 11 shows another example when limiting maximum transmit power in units of one or more component carrier according to the control transmitted power of embodiment of the present invention; And

Figure 12 shows the base station and subscriber equipment that can be applicable to embodiments of the present invention.

Embodiment

The embodiment of the present invention that can describe by referring to accompanying drawing is to understand structure of the present invention, operation and other features.Here, embodiments of the present invention may be used for various wireless access technology, as CDMA, FDMA, TDMA, OFDMA, SC-FDMA and MC-FDMA.Can utilize as universal terrestrial radio access (UTRA, UniversalTerrestrial Radio Access) or CDMA200 realize CDMA.Can utilize as global system for mobile communications (GSM, Global System for Mobile communication)/GPRS (GPRS, GeneralPacket Radio Service) wireless technology of/GSM evolution enhanced data-rates (EDGE, Enhanced Data Rates for GSMEvolution) realizes TDMA.The wireless technology as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802.20 and E-UTRA (evolution UTRA) can be utilized to realize OFDMA.UTRA is a part of universal mobile telecommunications system (UMTS).Third generation partner program (3GPP, 3 ^rdgenerationPartnership Project) Long Term Evolution (LTE) is a part of evolution UMTS (E-UMTS), it uses E-UTRA.LTE-A (senior) is the evolution version of 3GPP LTE.

Following execution mode of the present invention mainly describes the example of the technical characteristic of the present invention being applied to 3GPP system.But this is only exemplary.Therefore, the present invention will be not limited to embodiments of the present invention described herein.

Fig. 1 shows the network configuration of E-UMTS.E-UMTS is also called as LTE system.In order to understand the details of the technical specification of UMTS and E-UMTS, respectively with reference to " 3 ^rdgeneration Partnership Project; TechnicalSpecification Group Radio Access Network (third generation partnership project; Technical specification group Radio Access Network) " the 7th edition and the 8th edition.

With reference to Fig. 1, E-UMTS comprises subscriber equipment (UE, User Equipment) 120, e Node B (or eNB) 110a and 110b and IAD (AG, Access Gateway), IAD is positioned at one end of network (E-UTRAN) and is connected to external network.E Node B can send the multiple data flow for broadcast service, multicast service and/or unicast services simultaneously.One or more community can be there is in each e Node B.Community is set to use a bandwidth in 1.25MHz, 2.5MHz, 5MHz, 10MHz and 20MHz bandwidth.Different communities can be set to provide different bandwidth.E Node B sends for multiple UE control data and receives.E Node B sends down link (DL for DL data, DownLink) schedule information, to inform that corresponding UE will send the time domain/frequency domain of data, coding, data size and the information relevant with hybrid automatic repeat-request (HARQ, Hybrid AutomaticRepeat and reQuest).In addition, e Node B sends up (UL, UpLink) schedule information, to notify that corresponding UE can use time domain/frequency domain, coding, data size and the information relevant with HARQ for UL data.The network node etc. that core network (CN, Core Network) can comprise AG, register for the user of UE.AG manages the mobility of UE based on tracking area (TA, Tracking Area), and wherein, a TA comprises multiple community.

Fig. 2 show based on 3GPP wireless access network standard, the chain of command of Radio interface protocols between UE and E-UTRAN and the structure in user face.Chain of command refers to the path for sending for the control message of administer calls in UE and network.User face refers to the path for being sent in the data (e.g., speech data or the Internet packets data) generated in application layer.

Physics (PHY) layer (it is ground floor) utilizes physical channel to provide information transfer service to upper strata.The media interviews that PHY layer is connected to upper strata by transmission channel control (MAC, Medium Access Control) layer.Between MAC layer and PHY layer, data are transmitted by transmission channel.Also between the physical layer and the physical layer of receiver side of transmitter side, transmit data by physical channel.Time and frequency are used as Radio Resource by physical channel.Particularly, in DL, utilize OFDMA scheme to modulate physical channel, and in UL, utilize SC-FDMA scheme to modulate physical channel.

The MAC layer of the second layer provides service by logic channel to wireless spread-spectrum technology (RLC, the Radio LinkControl) layer on upper strata.The rlc layer of the second layer supports that authentic data sends.The function of rlc layer can be realized by the functional block in MAC.Packet data convergence protocol (the PDCP of the second layer, Packet Data ConvergenceProtocol) layer execution header compression function, to reduce unnecessary control information, to send Internet Protocol (IP, Internet Protocol) grouping (such as IPv4, IPv6 etc.) in the wave point with narrow bandwidth efficiently.

In chain of command, only define wireless heterogeneous networks (RRC, the Radio ResourceControl) layer being positioned at third layer foot.Rrc layer controls with the configuration of radio bearer (RB), reconfigures and discharge relevant physical channel, logic channel and transmission channel.RB refers to that provided by the second layer, send data between UE and network service.For this reason, the rrc layer of UE and the rrc layer of network exchange RRC information.If established RRC to connect between the rrc layer and the rrc layer of UE of wireless network, then UE has been in RRC connection mode.Otherwise UE is in RRC idle pulley.The Non-Access Stratum (NAS, Non-AccessStratum) being positioned at rrc layer higher level performs the function as session management and mobile management.

DL transmission channel for carrying out data transmission from from network to UE comprises the broadcast channel (BCH for transmitting system information, Broadcast Channel), for sending the paging channel (PCH of beep-page message, Paging Channel) and DL shared channel (DL-SCH, DL Shared Channel) for sending subscriber traffic or control message.Simultaneously, UL transmission channel for carrying out data transmission from from UE to network comprises the Random Access Channel (RACH for sending initial control message, Random Access Channel) and UL shared channel (UL-SCH, UL Shared Channel) for sending subscriber traffic or control message.

Fig. 3 shows the block diagram of transmitter for OFDMA and SC-FDMA and receiver.In UL, transmitter (402-414) is a part of UE, and receiver (416-430) is a part for e Node B.In DL, transmitter is a part for e Node B, and receiver is a part of UE.

With reference to Fig. 3, OFDMA transmitter comprises leaf inverse transformation (IDFT in deserializer 402, sub-carrier mapping module 406, M point discrete Fourier, Inverse Discrete Fourier Transform) module 408, Cyclic Prefix (CP, Cyclic Prefix) add module 410, parallel-to-serial converter 412 and radio frequency (RF, Radio Frequency)/digital to analog converter (DAC) module 414.

Signal transacting in OFDMA transmitter carries out as follows.First, bit stream is modulated to data symbol sequence.By performing the various signal transacting comprising chnnel coding, intertexture, scrambling etc. to the data block sent from MAC layer, bit stream can be obtained.Bit stream is also called as code word and is equal to the data block received from MAC layer.The data block received from MAC layer is also called as transmission block.Modulation scheme can comprise, but be not limited to, binary phase shift keying (BPSK, Binary Phase Shift Keying), Quadrature Phase Shift Keying (QPSK, Quadrature PhaseShift Keying) and n quadrature amplitude modulation (n-QAM, n-Quadrature Amplitude Modulation).Then, serial data symbols sequence is converted into parallel N number of data symbol (402).N number of data symbol is mapped to the N number of subcarrier distributed in M subcarrier altogether, and (M-N) individual residue subcarrier fills 0 (406).The data symbol mapped in a frequency domain is converted into time domain sequences (408) by M point IFFT process.After this, in order to reduce intersymbol interference (ISI, Inter-Symbol Interference) and inter-carrier interference (ICI, Inter-CarrierInterference), generate OFDMA symbol (410) by adding CP to time domain sequences.The parallel OFDM A symbol generated is converted into serial OFDMA symbol (412).Then, OFDMA symbol (414) is sent by digital-to-analogue conversion, frequency up-converted etc. to receiver.Available subcarrier in (M-N) individual residue subcarrier distributes to other users.Meanwhile, OFDMA receiver comprises leaf transformation (DFT) module 422, subcarrier demapping/balance module 424, parallel-to-serial converter 428 and detection module 430 in RF/ analog to digital converter (ADC) module 416, deserializer 418, CP removal module 420, M point discrete Fourier.The signal processing of OFDMA receiver has the configuration contrary with OFDMA transmitter.

Meanwhile, compared with OFDMA transmitter, SC-FDMA transmitter also comprises the N-point DFT module 404 be positioned at before sub-carrier mapping module 406.SC-FDMA transmitter expands the multiple data in frequency domain by DFT before IDFT process, thus compared with OFDMA scheme, reduces the peak-to-average power ratio (PAPR, Peak-to-Average Power Ratio) sending signal largely.Compared with OFDMA receiver, SC-FDMA receiver is also included in the N point IDFT module 426 after subcarrier De-mapping module 424.The signal processing of SC-FDMA receiver has the configuration contrary with SC-FDMA transmitter.

Fig. 4 shows the structure of the radio frames used in LTE system.

With reference to Fig. 4, radio frames has 10ms (327200T _s) length and comprise the subframe of 10 same sizes.Each subframe has the length of 1ms and comprises two time slots.Each time slot has 0.5ms (15360T _s) length.In this case, T _srepresent the sampling time, and by T _s=1/ (15kHz × 2048)=3.2552 × 10 ^-8(about 33ns) represents.Each time slot comprises multiple OFDM symbol in the time domain and comprises multiple Resource Block (RB, Resource Block) in a frequency domain.In LTE system, a RB comprises 12 individual OFDM symbol of subcarrier × 7 (or 6).The transmission time interval (TTI, Transmission Time Interval) as the unit interval sent for data can be determined in units of one or more subframe.Above-mentioned wireless frame structure is exemplary completely, and the number of sub frames that can comprise radio frames, timeslot number or OFDM symbol number carry out various amendment.

Fig. 5 shows the example of executive communication in simple component carrier environment.Fig. 5 can correspond to the example of the communication in LTE system.

With reference to Fig. 5, in FDD scheme, usually by a DL band and by bringing executive communication with DL with corresponding UL.In TDD scheme, by DL duration and the UL duration executive communication corresponding with the DL duration.In FDD or TDD scheme, data and/or control information can be carried out sending and receiving in units of subframe.By the power that increases in process of transmitting in poor channel environment and the power reduced in better channel circumstance, that UE reduces to be caused by excessive transmitted power, with the interference of neighbor cell, and optimize quantity of power used by power control scheme.When channel circumstance is bad, base station (BS, Base Station) order improves the power of UE.But, ignore and represent that UE power has exceeded maximum transmit power (that is, the transmitted power limit P of UE ^uE _maxor P _max).

Fig. 6 A shows the structure of the UL subframe used in LTE system.

With reference to Fig. 6 A, UL subframe comprises multiple time slot (such as, two time slots).According to CP length, time slot can comprise the SC-FDMA symbol of different number.Such as, in normal CP, time slot comprises 7 SC-FDMA symbols.UL subframe is divided into data field and controlled area.Data field comprises Physical Uplink Shared Channel (PUSCH, Physical Uplink Shared CHannel) and for sending data-signal, e.g., and voice and image.Power based on reference signal (RS, Reference Signal) included in same area determines the power of data-signal.Such as, can based on the power of the power determination data-signal of demodulation reference signal (DMRS, DeModulation Reference Signal).

Controlled area comprises Physical Uplink Control Channel (PUCCH, Physical Uplink Control CHannel), and sends various control information to UL.PUCCH be included in frequency domain the Resource Block (RB, Resource Block) that is positioned at two ends, data field to and jump based on time slot.Based on the transmitted power of control channel reference signal being arranged in PUCCH, determine the transmitted power of control information.The CONSTRUCTED SPECIFICATION of PUCCH is described with reference to Fig. 6 B below.Detection reference signal (SRS, Sounding Reference Signal) for UL channel measurement is arranged in last SC-FDMA symbol of subframe, and brings transmission by all of data field or some.

UL in LTE system sends and utilizes SC-FDMA to show single-carrier property, and does not allow to send PUSCH, PUCCH and SRS simultaneously.As compared to multicarrier system (e.g., OFDM), making it possible to effective use power amplifier by keeping low PAPR, SC-FDMA.Therefore, if should send data and control signal simultaneously, then the information that should be sent by PUCCH is with incidentally (piggyback) mode and data-reusing.And, in the SC-FDMA symbol sending SRS, do not send PUSCH or PUCCH.The power of PUSCH controls to control independently with the power of PUCCH.

Fig. 6 B shows the structure of the PUCCH used in LTE system.

With reference to Fig. 6 B, in normal CP, transmit UL RS being arranged in three continuous symbols in the middle of time slot, and in all the other four symbols communicating control information (that is, ACK/NACK).In expansion CP, time slot comprises 6 symbols, and transmits RS in the 3rd symbol and the 4th symbol.Control information also comprises CQI (CQI, Channel Quality Indicator), dispatch request (SR, Scheduling Request), pre-coding matrix index (PMI, Precoding Matrix Index), order designator (RI, Rank Indicator) etc.Based on the transmitted power of the transmitted power determination control information of RS in UL.In the structure of PUCCH, in UL, the number of RS and position change according to the type of control information.Utilize a perseverance zero auto-correlation (CG-CAZAC of Practical computer teaching, Computer Generated Constant Amplitude Zero Auto Correlation) the different cyclic shifts (CS, Cyclic Shifts) (frequency expansion) of sequence and/or different Wu Ershi (Walsh)/DFT orthogonal code (temporal extension) distinguish resource for control information.Even if w0, w1, w2 of being multiplied after IFFT are multiplied before the ifft with w3, also obtain identical result.Orthogonal mask (OC, the OrthogonalCover) sequence of corresponding length can be taken on RS.

Fig. 7 shows the example of executive communication in multiple component carriers environment.At present, wireless communication system (such as, lte-a system) uses by being polymerized multiple UL/DL frequency chunks to adopt wider frequency band to use aggregated bandwidth or the carrier aggregation technology of wider UL/DL bandwidth.Component carrier (CC, Component Carrier) is utilized to send each frequency chunks.In this specification, based on context, CC can refer to the mean carrier of frequency chunks for carrier aggregation or frequency chunks, and they can be used with.

CC with reference to five 20MHz of Fig. 7, each UL/DL can support the bandwidth of 100MHz.Each CC can be adjacent one another are in a frequency domain, or can be non-conterminous.Conveniently, Fig. 7 shows the identical and situation of symmetry of the bandwidth of the bandwidth sum DL CC of UL CC.But, the bandwidth of each CC can be determined independently.Such as, the bandwidth of UL CC can be constructed to 5MHz (A _uL)+20MHz (B _uL)+20MHz (C _uL)+20MHz (D _uL)+5MHz (E _uL).Can also construct asymmetric carrier aggregation, wherein, the number of UL CC is different from the number of DL CC.Because the restriction of available band can generate asymmetric carrier aggregation, or in network process of establishing, asymmetric carrier aggregation can be performed wittingly.Such as, even if whole system band is made up of N number of CC, the frequency band that particular UE can receive also can be restricted to M (<N) individual CC.Various parameters for carrier aggregation can be arranged according to concrete community (cell-specifically), concrete UE group (UEgroup-specifically) or concrete UE (UE-specifically).

In lte-a system, transmitting terminal can send multiple signal/(physics) channel by single CC or multiple CC simultaneously.Such as, two or more the identical or different channels selected from PUSCH, PUCCH or SRS can be sent simultaneously.Therefore, if when not keeping single carrier transfer characteristic, send multiple (physics) channel, then, when the transmitted power sum gone out for described multiple (physics) channel calculation reaches the maximum transmit power limit, need the operation considering UE.Unless otherwise proposed in this manual, otherwise multiple signal/(physics) channel refers to transmitted power by signal/(physics) channel determined independently.Such as, multiple signal/(physics) channel comprises signal/(physics) channel be associated from different independent RS.In this specification, the transmission of (physics) channel refers to the transmission being carried out signal by (physics) channel.In this specification, signal can be mixed with (physics) channel.

Thereafter, the method controlling transmitted power is described in detail with reference to Fig. 8 to Figure 11.Conveniently, although give the description of Fig. 8 to Figure 11 in an illustrative manner from the angle of UE, even if when BS sends multiple signal, it also can by amendment simple application.In embodiments of the present invention, transmitted power can be represented as lineal scale or dB scale.Operation according to the embodiment of the present invention can perform in power domain or amplitude territory.

execution mode 1: consider that the power of (channel) priority controls

Fig. 8 shows exemplary transmission power control according to the embodiment of the present invention.In this embodiment, propose when the transmitted power sum of multiple physical channel exceedes maximum transmit power, consider that (channel) priority controls the transmitted power of physical channel.

One or more transmission power control (TPC, Transmit PowerControl) order (S810) can be received from BS with reference to Fig. 8, UE.TPC command can be included in the response message to the lead code for Stochastic accessing, or can pass through Physical Downlink Control Channel (PDCCH, Physical Downlink Control CHannel) and send.According to Downlink Control Information (DCI, Downlink Control Information), PDCCH can have various form, and according to form, can have different TPC command.Such as, UE can receive the PDCCH of various form, as the form dispatched for DL, form, the TPC professional format for PUSCH and the TPC professional format for PUCCH dispatched for UL.TPC command may be used for the transmitted power determining the transmitted power of each CC, the transmitted power of CC group or all CC.TPC command can also be used for the transmitted power determining each signal (e.g., PUSCH, PUCCH etc.).Can by the PDCCH of various form (as, for DL scheduling form, for UL scheduling form, for UL data channel (as, PUSCH) TPC professional format and the TPC professional format for UL control channel (e.g., PUCCH)) receive TPC command.

Be scheduled as simultaneously to multiple physical channels that BS sends if existed, then UE determines transmitted power P respectively for multiple UL physical channel ₁, P ₂..., P _n(wherein, N>=2) (S820).Each UL physical channel comprises one or more continuous print OFDMA symbol or SC-FDMA symbol.In Fig. 9, but be not limited to Fig. 9, show UE sends example from the situation of multiple signal to UL.With reference to Fig. 9, single CC or multiple CC can be utilized to send multiple physical channel simultaneously.Such as, multiple PUCCH, multiple PUSCH or multiple SRS can send (example 1 to 3) simultaneously, or can send the combination (example 4 to 7) of PUCCH, PUSCH and/or SRS simultaneously.When PUCCH, can exhaustive division be the situation sending ACK/NACK, CQI and SR.

If determine UL transmitted power, then UE checks the summation ∑ P of the transmitted power of UL physical channel _nwhether (wherein, 1≤n≤N) is greater than maximum power value P _max(S830).Maximum power value can be determined in units of CC, CC group or whole CC.Maximum power value depends on the physical capability of UE substantially, but can pre-determine according to communication system.Can consider that permission power, load balance etc. in community change maximum power value.Therefore, in this specification, maximum power value can be mixed with maximum allowable power value, and both can exchange use.Information about maximum power value can be passed through broadcast (such as, system information) and broadcast in community, or can be sent with signal by RRC information.Information about maximum power value can be sent to UE by DL control channel (e.g., PDCCH).According to channel circumstance, for good and all, semi-permanently or dynamically maximum power value can be set.When by limiting maximum power value to BS transmission signal, maximum power value can have the implication identical with maximum allowable power in community.Such as, maximum power value can pre-determine, or can specify according to concrete community, concrete UE group, concrete UE, concrete CC group or concrete CC.

If the summation ∑ P of the transmitted power of UL physical channel _n(wherein, 1≤n≤N) is equal to or less than maximum power value P _max, then the transmitted power of corresponding UL physical channel is kept.Simultaneously, if the summation of the UL transmitted power of UL physical channel is greater than maximum power value, then consider priority, control the transmitted power of one or more UL physical channel, make the summation of the transmitted power of UL physical channel be no more than maximum power value (S840).Can consider that the information that the type of UL physical channel and UL physical channel carry is to determine priority.Priority will be described in detail below.Transmitted power can be controlled for all bands or in units of CC group or CC.

If the transmitted power of control UL physical channel, then UE generates multiple UL physical channels (S850) with corresponding transmitted power.Before the ifft, can the transmitted power (in Fig. 3 408) of control UL physical channel in a frequency domain.But, the present invention is not limited thereto.In this case, the control of transmitted power can be performed in units of subcarrier.Such as, by the modulation value being mapped to subcarrier is multiplied by weight, transmitted power can be controlled.The diagonal matrix of each element representation value relevant with transmitted power (power diagonal matrix) can be used to be multiplied by weight.At multiple-input and multiple-output (MIMO, Multiple Input Multiple Output) system when, the pre-coding matrix incorporating weight can be utilized to control transmitted power, or the modulation value after precoding can be multiplied by power diagonal matrix to control transmitted power.Therefore, even if multiple physical channel is included in the frequency band applying identical IFFT, the transmitted power of each physical channel can also easily be controlled.Control to separate together with controlling with the power in frequency domain or with the power in frequency domain, can the transmitted power of control UL physical channel in the time domain after the ifft.Particularly, the transmission power control in time domain can be performed in various functional block.Such as, the control of transmitted power can be performed in DAC block and/or RF block (414 of Fig. 3).After this, UE sends the UL physical channel (S860) of multiple generation to BS by one or more CC.In this specification, simultaneously or same time section comprise identical TTI or subframe.

Consider that priority is to the method for the transmitted power of control UL channel by the step 840 being described in detail in Fig. 8.Conveniently, the exemplary power control method when only there is two channels according to same sequence or priority will be described.But the present invention can be applicable to channel or its combination of three or more identical or different types.

For convenience, following symbol is defined.

P _pUSCH: its expression calculates the power will distributing to PUSCH.By Power Limitation, the power of actual allocated may be less than P _pUSCH.If do not indicate dB, then this can represent lineal scale.

P _pUCCH: its expression calculates the power will distributing to PUCCH.By Power Limitation, the power of actual allocated may be less than P _pUCCH.If do not indicate dB, then this can represent lineal scale.

P _sRS: its expression calculates the power will distributing to SRS.By Power Limitation, the power of actual allocated may be less than P _sRS.If do not indicate dB, then this can represent lineal scale.

example 1-1:P _pUSCH + P _pUSCH >P _max

Example 1-1 corresponds to the situation that the multiple PUSCH simultaneously sent in multiple different CC reach the maximum transmission limit.In this case, can reduce or reduce the transmitted power of each PUSCH.Particularly, following option can be considered.

Option one: the priority that PUSCH is identical can be given.If like this, the power of PUSCH can be reduced with identical ratio, or the power of the identical amount of reduction PUSCH.That is, identical attenuation rate can be applied or deduct identical value.

Option 2: the transformat can considering PUSCH, gives priority to PUSCH.Such as, can according to transport block size (TBS, Transport Block Size) or modulation and encoding scheme (MCS, Modulationand Coding Scheme) determine priority, sequentially to reduce or to reduce the transmitted power of the PUSCH with low priority.Desirably, the PUSCH low priority with little TBS (data volume), low MCS (low bit-rate) or low modulation exponent number (modulation order) is given.In this case, larger attenuation rate can be applied to the PUSCH with low priority.But if even if only retain a PUSCH due to the minimizing (drop) of PUSCH, transmitted power still exceedes the maximum transmission limit, then in process of transmitting, the power of corresponding PUSCH is also reduced to P _max.

example 1-2:P _{pUCCH (ACK/NACK)} + P _pUSCH >P _max

Example 1-2 is when in different CC or in a CC, and PUSCH and the transmitted power sum of the PUCCH sending ACK/NACK reach situation during maximum power limit.Option below can be considered.

Option one: ACK/NACK priority can be given.UL ACK/NACK is for reporting success or the failure of DL data receiver.If correctly do not carry out such report, then DL resource is wasted.Therefore, high priority is distributed to the transmission of ACK/NACK, and in process of transmitting, reduce or reduce the transmitted power of PUSCH.When reducing the transmitted power of PUSCH, first transmitted power can distribute to PUCCH, and remaining power can distribute to PUSCH.This can be represented by formula below: P _pUSCH=P _max-P _{pUCCH (ACK/NACK)}.Here, can option below additional application.

Option one .1: owing to being used for PUSCH, so make the error rate of PUSCH increase to remaining power after PUCCH allocation of transmit power.Therefore, in process of transmitting, reduce the MCS of the data sent to PUSCH, make it possible to receive PUSCH with the error rate identical with the error rate before power reduction.For this reason, the information relevant with the MCS after reduction can be sent with signal to BS.

Option 2: PUSCH priority can be given.If reduce the power of the PUCCH sending ACK/NACK, then waste DL resource due to the reception mistake of ACK/NACK in UL.Especially, if NACK is identified as ACK, then there is the re-transmission on upper strata, and more postpone the transmission of DL data.Meanwhile, if ACK is identified as NACK, then only there is the waste retransmitted within the physical layer.Therefore, when sending emergency data, for making the situation of data delay prepare owing to sending PUSCH with continuous low power, can consider first to distribute power to PUSCH, and distributing dump power (power of reduction) to PUCCH.In this case, expect the power reduction of PUCCH to be limited to the situation that PUCCH sends ACK.

example 1-3:P _sRS + P _pUSCH >P _max

The situation that example 1-3 reaches maximum power limit corresponding to the transmitted power sum of SRS with PUSCH in different CC or in a CC is corresponding.Option below can be considered.

Option one: SRS can be given and send priority.When BS performs best UL scheduling by measuring UL channel status, use SRS.Consider the efficiency of next time dispatching, high priority can be distributed to SRS.Then, in process of transmitting, reduce or reduce the transmitted power of PUSCH.In order to reduce the transmitted power of PUSCH, first transmitted power can distribute to SRS, and dump power can distribute to PUSCH.This can be expressed as: P _pUSCH=P _max-P _sRS.In this case, can the following option of additional application.

Option one .1: because remaining power is used for PUSCH after SRS allocation of transmit power, so the error rate of PUSCH increases.Therefore, in process of transmitting, reduce the MCS of the data sent to PUSCH, make it possible to receive PUSCH with the error rate identical with the error rate before power reduction.For this reason, the information relevant with the MCS after reduction can be sent with signal to BS.

Option 2: PUSCH can be given and send priority.If reduce the transmitted power of SRS, then because BS does not recognize that the reduction of received power is that transmission that is that cause due to the ambient condition difference of UL wireless channel or that reduce power due to UE causes, so may judge by accident channel information.Therefore, if transmitted power is not enough, then SRS can be reduced.

example 1-4:P _{pUCCH (ACK/NACK)} + P _{pUCCH (ACK/NACK)} >P _max

Example 1-4 corresponds to the situation that the transmitted power sum of multiple PUCCH sending ACK/NACK reaches maximum power limit.In this case, reduce or reduce the transmitted power of each PUCCH.Particularly, following option can be considered.

Option one: the priority that the PUCCH of transmission ACK/NACK is identical can be given.If like this, then can reduce the power of PUCCH with same ratio, or the power of the identical amount of reduction PUCCH.That is, identical attenuation rate can be applied or deduct identical value.

Option 2: according to priority, can reduce or reduce the power of a part of PUCCH.

Option 2.1: if NACK is identified as ACK, then compared with the situation being identified as NACK with ACK, the wasting of resources and transmission lag more serious.Therefore, first reduction or reduction send the transmitted power of the PUCCH of ACK.Can consider to arrange specific threshold and by power reduction to this threshold value.

Option 2.2: the priority determining PUCCH according to TBS or MCS of the PDSCH corresponding with the ACK/NACK of each PUCCH, and reduce or reduce the transmitted power with the PUCCH of low priority.It is desirable that, distribute low priority to the PDSCH of little TBS or low MCS.But, when reduce PUCCH, if even if only retain a PUCCH, transmitted power also exceedes maximum power limit, then in process of transmitting by the power reduction of corresponding PUCCH to P _max.

example 1-5:P _{pUCCH (CQI)} + P _{pUCCH (CQI)} >P _max

Example 1-5 corresponds to the situation that the transmitted power sum of multiple PUCCH sending CQI in different CC reaches maximum power limit.CQI is used for by identifying that the state of DL wireless channel performs efficient DL and dispatches.Following option can be considered.

Option one: the priority that the PUCCH of transmission CQI is identical can be given.If like this, the power of PUCCH can be reduced with identical ratio, or reduce the power of the identical amount of PUCCH.That is, identical attenuation rate can be applied, or deduct identical value.

Option 2: can reduce according to priority or reduce the power of a part of PUCCH.BS performs scheduling for UE by selecting the wireless channel with high CQI.Because the channel with low CQI is unlikely selected by BS, receive not too important so correct.Therefore, first reduce in process of transmitting or reduce the transmitted power with the PUCCH of low CQI.Can specific threshold be set, and can considers power reduction to this threshold value.

example 1-6:P _{pUCCH (ACK/NACK)} + P _{pUCCH (CQI)} >P _max

When the transmitted power sum of the multiple PUCCH sending CQI and ACK/NACK reaches maximum power limit, application example 1-6.As described in more early, ACK/NACK high priority is given.Meanwhile, CQI is used for efficient DL scheduling, as the information sending DL channel status to BS.Even if distribute better channel to UE, if the normal reception of data can not be confirmed exactly, also there will be unnecessary re-transmission.Therefore, CQI low priority is given.That is, first distribute power to the PUCCH sending ACK/NACK, and distribute dump power to the PUCCH sending CQI, or reduce the PUCCH sending CQI.Meanwhile, the PUSCH of both CQI and ACK/NACK is sent with the mode process identical with the PUCCH sending ACK/NACK.

example 1-7:P _{pUCCH (SR)} + P _{pUCCH (ACK/NACK)} >P _max

Example 1-7 corresponds to the situation that the transmitted power sum of multiple PUCCH sending SR and ACK/NACK reaches maximum power limit.Following option can be considered.

Option one: ACK/NACK can be given and send high priority.Therefore, first distribute power to the PUCCH sending ACK/NACK, and distribute dump power to the PUCCH sending SR, or reduce the PUCCH sending SR.Meanwhile, if reduce because the PUCCH long-time continuous sending ACK/NACK exists the PUCCH sending SR, then UL scheduling can not be carried out.In order to compensate this, if the PUCCH sending SR has been delayed by special time, then the PUCCH sending ACK/NACK can be reduced.

Option 2: SR can be given and send high priority.Send mistake owing to being solved ACK/NACK by re-transmission, so consider that scheduling is important, can send to SR and distribute high priority, and in process of transmitting, can reduce or reduce the transmitted power of the PUCCH sending ACK/NACK.When reducing the transmitted power of the PUCCH sending ACK/NACK, first transmitted power can distribute to the PUCCH sending SR, and dump power can distribute to the PUCCH sending ACK/NACK.This can be represented as: P _{pUCCH (ACK/NACK)}=P _max-P _sR.

Option 3:UE sends ACK/NACK to the PUCCH sending SR.Then, BS can detect the SR of on-off keying (on/off keyed) in PUCCH by energy measuring, and can judge ACK/NACK by symbol decoding.In this case, if there are the multiple PUCCH sending ACK/NACK, then ACK/NACK can be used to bundle (bundling) or PUCCH selection transmission.ACK/NACK bundlees expression: send an ACK when sending all ACK without any receiving multiple DL PDSCH mistakenly, and sends a NACK when even there is mistake in any one DL PDSCH.PUCCH selects to send and represents once receive multiple DL PDSCH, is sent multiple ACK/NACK results of modulation value by the PUCCH resource selected from multiple PUCCH resource taken.

example 1-8:P _{pUSCH (UCI)} + P _pUSCH >P _max

The transmitted power sum that example 1-8 corresponds in different CC the PUSCH sending ascending control information (UCI, Uplink Control Information) and the PUCCH only sending data reaches the situation of maximum power limit.Following option can be considered.

Option one: be used in the priority defining method described in example 1-1 when not considering UCI.Such as, can give PUSCH identical priority.In this case, the power of PUSCH can reduce with same ratio.Consider the transformat of PUSCH, different priority can be distributed to PUSCH.

Option 2: due to control information be included in above incidentally have in the PUSCH of UCI, so high priority incidentally has the channel of UCI above can distributing to.Therefore, reduce in process of transmitting or reduce the transmitted power only sending the PUSCH of data.When reducing only to send the transmitted power of the PUSCH of data, incidentally there is the PUSCH allocation of transmit power of UCI first upward, then can distribute dump power to the PUSCH only sending data.This can be represented as: P _pUSCH=P _max-P _{pUSCH (UCI)}.When reduction only sends the transmitted power of the PUSCH of data, higher attenuation rate can be applied to the PUSCH only sending data.But if even if only retain a PUSCH due to the minimizing of PUCCH, transmitted power also exceedes maximum transmit power, then in process of transmitting by the power reduction of corresponding PUSCH to P _max.

example 1-9:P _{pUSCH (Retransmission)} + P _pUSCH >P _max

Example 1-9 corresponds to the situation that the PUSCH sending data retransmission and the transmitted power sum of PUSCH sending new data reach maximum power limit.

Option one: be used in the priority defining method described in example 1-1 when not considering re-transmission.Such as, can give PUSCH identical priority.In this case, the power of PUSCH can be reduced with identical ratio.Consider the transformat of PUSCH, different priority can be distributed for PUSCH.

Option 2: due to retransmit may due in process of transmitting before the reduction of transmitted power occur, so high priority can distribute to the PUSCH of re-transmission, to improve the acceptance rate of PUSCH.

example 1-10:P _{pUSCH (Retransmission)} + P _{pUSCH (Retransmission)} >P _max

Example 1-10 corresponds to the situation that the transmitted power sum of PUSCH sending data retransmission reaches maximum power limit.Option below can be considered.

Option one: when not considering to retransmit, the priority defining method that can describe in use-case 1-1.Such as, can give PUSCH identical priority.In this case, the power of PUSCH can be reduced with same ratio.Consider the transmission form of PUSCH, different priority can distribute to PUSCH.

Option 2: due to retransmit may due in process of transmitting before the reduction of transmitted power occur, so high priority can distribute to the PUSCH with larger number of retransmissions, to improve the acceptance rate of the PUSCH of re-transmission.

example 1-11:P _{pUSCH (Retransmission)} + P _pUCCH / P _sRS >P _max

Example 1-11 reaches the situation of maximum power limit corresponding to the transmitted power of PUSCH and the transmitted power sum of PUCCH/SRS that send data retransmission.Following option can be considered.

Option one: when not considering to retransmit, the priority defining method that can describe in use-case 1-2 and example 1-3.

Option 2: due to retransmit may due in process of transmitting before the reduction of transmitted power occur, so high priority can distribute to the PUSCH of re-transmission, to improve the acceptance rate of PUSCH.

execution mode 2: the power of every CC (group) controls

When UE has a power amplifier, the transmitted power control method of the UE up to the present described is useful.But in lte-a system, multiple CC can distribute to UE, and the CC distributed can be band that is continuous or that be separated in a frequency domain.If the CC distributed exists as separating belt, then owing to being difficult to make UE only use a power amplifier to amplify power in wide frequency domain, so multiple power amplifier may be needed.In this case, each power amplifier power amplification of an only CC group that can be responsible for an only CC or be made up of some CC.Therefore, even if UE has multiple power amplifier, by method presented above being expanded to the Poewr control method of each CC or CC group, also can naturally applied power control.

After this, description is existed in the environment of the transmitted power limit of each CC (group) and total both transmitted power limit of UE, when UE reaches the transmitted power restriction of specific CC (group), UE reaches total transmitted power limit, or when UE reaches above-mentioned two power limits, the operation of UE according to an illustrative embodiment of the invention.

Usually, can as shown in by following formula 1, the UL transmitted power of restriction UE:

[formula 1]

$P^{UE}\&le;\min (P_{Max}^{UE},\underset{CC}{\&Sigma;}\min (P_{Max}^{CC=i},\underset{Ch}{\&Sigma;}{p}_{Ch=j}^{CC=i}\left)\right)$

If the quantized level of the power amplifier of UE is enough high, then can meet as equal in what represented by formula 2:

[formula 2]

$P^{UE}=\min (P_{Max}^{UE},\underset{CC}{\&Sigma;}\min (P_{Max}^{CC=i},\underset{Ch}{\&Sigma;}{P}_{Ch=j}^{CC=i}\left)\right)$

The symbol used in above formula is as given a definition.

P ^uE: the UL transmitted power of UE

the maximum transmit power (or transmitted power limiting value) of UE.In other words, this represents the maximum transmit power (or transmitted power limiting value) for all CC.The maximum transmit power value of UE can be determined by total transmitted power of UE, or the combination can passing through value set in network (e.g., BS) is determined.The information relevant with the maximum transmit power value of UE can be represented by top signaling.Such as, the information relevant with the maximum transmit power value of UE can be sent with signal according to concrete community (cell-specifically) by broadcast, or can be sent with signal according to concrete UE or concrete UE group by RRC information.

maximum transmit power (or transmitted power limiting value) in i-th CC (group).The maximum transmit power value of each CC (group) can can transmitted power the determining of transmitted power or each CC (group) by the total of UE, or can pass through to determine for the combination of the value set by each CC (group) in network (e.g., BS).The information relevant with the maximum transmit power value of each CC (group) can be represented by top signaling.Such as, the information relevant with the maximum transmit power value of each CC (group) can be sent with signal according to concrete community (cell-specifically) by broadcast, or can be sent with signal according to concrete UE or concrete UE group by RRC information.Meanwhile, consider the information about the interference (or covering) with other UE (or CC (group)), the maximum transmit power value of each CC (group) can be sent with signal.The information relevant with the maximum transmit power value of each CC (group) can comprise the information about the interference (or covering) with other UE (or CC (group)).In all CC (CC group), the maximum transmit power of each CC (group) can have identical value.

the transmitted power of a jth channel of i-th CC (group).

example 2-1: $\underset{\&OverBar;}{\underset{CC}{\&Sigma;}\min (P_{Max}^{CC=i},\underset{Ch}{\&Sigma;}{P}_{Ch=j}^{CC=i})\&le;P_{Max}^{UE}}$

Example 2-1 is when the maximum transmit power sum of the CC (CC group) in all CC (CC group) is less than the maximum transmit power of UE and the maximum transmit power sum of the channel of all CC (CC group) is less than the maximum transmit power of UE simultaneously.Transmitted power due to UE is not limited to total transmission power value, so can meet the formula 3 of simplification:

[formula 3]

$P^{UE}\&le;\underset{CC}{\&Sigma;}\min (P_{Max}^{CC=i},\underset{Ch}{\&Sigma;}{P}_{Ch=j}^{CC=i})=\underset{CC\&Element;S}{\&Sigma;}{P}_{Max}^{CC=i}+\underset{CC\&Element;s^c}{\&Sigma;}\underset{Ch}{\&Sigma;}{P}_{Ch=j}^{CC=i}$

If the quantized level of the power amplifier of UE is enough high, then can meet as equal in what represented by formula 4:

[formula 4]

$P^{UE}=\underset{CC}{\&Sigma;}\min (P_{Max}^{CC=i},\underset{Ch}{\&Sigma;}{P}_{Ch=j}^{CC=i})=\underset{CC\&Element;S}{\&Sigma;}{P}_{Max}^{CC=i}+\underset{CC\&Element;s^c}{\&Sigma;}\underset{Ch}{\&Sigma;}{P}_{Ch=j}^{CC=i}$

In formula 3 and formula 4, the transmitted power sum that S set refers to CC (group) interior channel more than CC (group) maximum transmit power value (that is, ) the set of CC (group).In this case, control transmitted power sum, to be no more than the maximum transmit power of CC (group) in only S set.Power control can be performed by introducing attenuation coefficient.Such as, power controls the attenuation coefficient that can be reduced to the transmitted power of searching for each channel method, as shown in by formula 5:

[formula 5]

$\underset{Ch}{\&Sigma;}{\mathrm{\&alpha;}}_j^i\&times;P_{Ch=j}^{CC=i}\&le;P_{Max}^{CC=i},$ Wherein i ∈ S

example 2-2: $\underset{\&OverBar;}{\underset{CC}{\&Sigma;}\min (P_{Max}^{CC=i},\underset{Ch}{\&Sigma;}{P}_{Ch=j}^{CC=i})>P_{Max}^{UE}}$

Example 2-2 corresponds to the maximum transmit power of UE and is less than the maximum transmit power sum of CC (group) and is less than the situation of the transmitted power sum of all channels simultaneously.Because the transmitted power of UE limits by maximum transmit power value, institute to satisfy equation 6:

[formula 6]

$P^{UE}\&le;P_{Max}^{UE}$

If the quantized level of the power amplifier of UE is enough high, then can meet as equal in what represented by formula 7:

[formula 7]

$P^{UE}=P_{Max}^{UE}$

In situation, as in example 2-1, the transmitted power of UE can be reduced to the maximum transmit power of UE.The transmitted power sum of each CC (group) interior channel should be less than the maximum transmit power of CC (group), and the transmitted power sum of all CC (group) should be less than the maximum transmit power value of UE.Power controls the attenuation coefficient that can be reduced to the transmitted power of searching for each channel method, as shown in by formula 8:

[formula 8]

$\underset{Ch}{\&Sigma;}{\mathrm{\&alpha;}}_j^i\&times;P_{Ch=j}^{CC=i}\&le;P_{Max}^{CC=i},$ Wherein i ∈ S

$\underset{CC}{\&Sigma;}\underset{Ch}{\&Sigma;}{\mathrm{\&alpha;}}_j^i\&times;P_{Ch=j}^{CC=i}\&le;P_{Max}^{UE}$

Because the method described in example 2-1 and example 2-2 calculates attenuation coefficient by the limit (total transmitted power limit and CC (group) the transmitted power limit) of optimization two kinds of situations, so may occur that the method utilizing some complexity performs the problem optimized.Therefore, the method being used for efficient calculation attenuation coefficient is described with reference to Figure 10 and Figure 11.

In Figure 10 and Figure 11, trunnion axis represents CC (group), and vertical axis represents power level.Dash box in each CC (group) represents the channel in corresponding CC (group).In order to represent channel easily, show shade.Each shade can represent different channels or same channel.In Figure 10 and Figure 11, suppose that the transmitted power sum of CC (CC group) is greater than the maximum transmit power value P_UE_MAX of UE, and the transmitted power sum of channel in CC (CC group) 1 and 3 is respectively more than maximum transmit power P_CC1_MAX and P_CC3_MAX ((a) of Figure 10 and (a) of Figure 11) of CC (CC group).CC (CC group) 1 and 3 forms the S set described with reference to formula 3 and formula 4.

Figure 10 shows the method for calculating the attenuation coefficient controlled for power according to the embodiment of the present invention.With reference to Figure 10, calculate the attenuation coefficient being used for power and controlling by two steps.In a first step, the transmitted power of the channel in S set of can decaying, to meet the transmitted power limit criterion of CC (group).In a first step, attenuation coefficient can be determined independently according to formula 9

[formula 9]

${\mathrm{\&alpha;}}_j^{i}s.t\underset{Ch}{\&Sigma;}{\mathrm{\&alpha;}}_j^i\&times;P_{Ch=j}^{CC=i}\&le;P_{Max}^{CC=i},$ Wherein i ∈ S

Can find out that the transmitted power sum of channel in CC (CC group) 1 and 3 is reduced to the maximum transmit power value of corresponding CC (CC group) respectively from (b) of Figure 10.

But in (b) of Figure 10, the transmitted power sum of CC (CC group) is still greater than the maximum transmit power value P_UE_MAX of UE.Thus, if even if the transmitted power of channel reduces in S set, total also do not meet the transmitted power limit of UE, then in the second step, reduce the transmitted power of all channels of all CC (CC group), to meet total transmitted power limit.In the second step, independently attenuation coefficient can be determined according to formula 10

[formula 10]

${\mathrm{\&beta;}}_j^{i}s.t\underset{CC\&Element;S}{\&Sigma;}\underset{Ch}{\&Sigma;}{\mathrm{\&beta;}}_j^i\&times;{\mathrm{\&alpha;}}_j^i\&times;P_{Ch=j}^{CC=i}+\underset{CC\&Element;s^c}{\&Sigma;}\underset{Ch}{\&Sigma;}{\mathrm{\&beta;}}_j^i\&times;P_{Ch=j}^{CC=i}\&le;P_{Max}^{UE}$

As can be seen from (c) of Figure 10, the transmitted power sum of all channels is reduced to total transmitted power limiting value P_UE_MAX of UE.For the sake of simplicity, the attenuation coefficient of channel in S set can 1 be set to, and can only determine for the supplementary set of S set is incompatible alternatively, the supplementary set of S set close in the attenuation coefficient of channel can 1 be set to, and can only determine for S set

Figure 11 shows the method for calculating the attenuation coefficient controlled for power according to another implementation of the invention.With reference to Figure 11, mainly calculate the attenuation coefficient controlled for power by two steps, and additional step can be comprised for power back-off.In a first step, the transmitted power of channel in all CC that can decay (CC group), to meet total transmitted power limit criterion of UE.Attenuation coefficient can be determined independently according to formula 11

[formula 11]

${\mathrm{\&beta;}}_j^{i}s.t\underset{CC}{\&Sigma;}\underset{Ch}{\&Sigma;}{\mathrm{\&beta;}}_j^i\&times;P_{Ch=j}^{CC=i}\&le;P_{Max}^{UE}$

As can be seen from (b) of Figure 11, reduce the transmitted power of channel in all CC (CC group), make the transmitted power sum of all channels consistent with total transmitted power limiting value P_UE_MAX of UE.

But in (b) of Figure 11, the transmitted power sum of the channel of CC (group) 3 is still greater than the power threshold P_CC3_MAX of CC (group) 3.Therefore, even if if there is the transmitted power reducing channel in all CC (CC group), the CC (group) of the transmitted power limit of CC (group) is not met (namely yet, S set), then can reduce the transmitted power of the channel of all CC in S set (CC group) in the second step.Independently attenuation coefficient can be determined according to the condition of formula 12

[formula 12]

${\mathrm{\&alpha;}}_j^{i}s.t\underset{Ch}{\&Sigma;}{\mathrm{\&alpha;}}_j^i\&times;{\mathrm{\&beta;}}_j^i\&times;P_{Ch=j}^{CC=i}\&le;P_{Max}^{CC=i},$ Wherein i ∈ S

As can be seen from (c) of Figure 11, the transmitted power sum of the channel of CC (group) 3 (that is, S set) is reduced to the maximum transmit power value P_CC3_MAX of corresponding CC (group).

Then, in third step, for the channel in the supplementary set of S set, the quantity of power reduced from the channel of S set can be compensated $P_{R-SUM}=\underset{CC\&Element;S}{\&Sigma;}\underset{Ch}{\&Sigma;}(1-{\mathrm{\&alpha;}}_j^i)\&times;{\mathrm{\&beta;}}_j^i\&times;P_{Ch=j}^{CC=i}.$ After the compensation of channel, power should not exceed the maximum transmit power value of corresponding CC (group).With reference to (d) of Figure 11, the power back-off reduced from CC (group) 3 is in the second step to CC (group) 2.Contrary with (d) of Figure 11, the power reduced from CC (group) 3 in the second step can compensate to CC (group) 1.Followingly think power compensating method.

1. priority criteria: distribute priority according to the importance degree of message in channel (PUCCH, PUSCH and SRS) or urgency, and to the more power of the channel allocation with higher priority.

2. identical compensation rate: for all channels of the supplementary set of S set, compensate the power of identical amount.

3. identical cancellation ratio: for all channels of the supplementary set of S set, with same ratio compensation power.

4. utilize 1., 2. and 3. may combine compensation power.

The attenuation coefficient described with reference to Figure 10 and Figure 11 can be determined in every way with for determining attenuation coefficient with criterion can consider, but be not limited to priority, identical attenuation, identical rate of decay or its combination.

In priority criteria method, according to importance degree or the urgency of the message in channel (e.g., PUCCH, PUSCH and SRS), to each channel assignment priority, and to the larger attenuation factor value of the channel allocation with higher priority.That is, the method ensures the channel with high priority to improve acceptance rate, and provides statistically lower acceptance rate to the channel with low priority.Therefore, from the channel with low priority, power is reduced.The priority of channel can be determined according to above-mentioned example 1-1 to 1-11, and can priority between additional consideration CC.Such as, if UE attempts utilizing multiple CC to carry out UL transmission, then can first to the important control information in specific CC transmission UL transmission message or important messages.In this case, high priority can be distributed to the specific CC sending important control information.

By attenuation coefficient is restricted to 0 or 1 priority criteria method can be revised as simpler method.That is, can from there is the channel of low priority in CC (group) allocation of transmit power 0 in order, make the transmitted power sum of channel be less than the transmitted power limiting value of CC (group) therefore, do not send the channel with low priority, and send the channel with high priority with original transmitted power.

Identical attenuation criterion method is used for making all channels in each CC (group) more than the transmitted power limit of CC (group) reduce the power of identical amount.That is, in CC (group), all channels stand the loss of identical power attenuation.When difference between the transmitted power sum and the maximum transmit power value of CC (group) of channel in CC (group) is not obvious, the method can be useful.Identical attenuation coefficient can be applied to all channels of the transmitted power limit more than CC (group) in each CC (group) by identical attenuation rate criterion method.Identical attenuation criterion method corresponds to the method for the power for reducing identical amount with lineal scale, and identical attenuation rate criterion method corresponds to the method for the power for reducing identical amount with dB scale.

in execution mode 3:MIMO, the power of every root antenna controls

Even if by utilizing MIMO to send in the transmission of (Tx) diversity or spatial reuse, also apply above-mentioned Poewr control method in the same manner.In this case, said method is corresponding with the operation in layer, stream or antenna.If UE comprises many transmitting antennas, then the maximum transmit power in the power amplifier of each antenna can be restricted to (wherein, n is antenna index).The maximum transmit power of each antenna can limit by the characteristic (e.g., level) of power amplifier, or can by broadcast or RRC signaling (adding) restriction.The upper limit of the operable transmitted power of UE is limited by the two minimum value following: the maximum transmit power sum of antenna and the maximum transmit power of UE, as shown in Equation 13:

[formula 13]

$P^{UE}=min(P_{Max}^{UE},\underset{n}{\&Sigma;}{P}_{Max}^{antenna,n})$

If limit the transmitted power of each CC (group), then the upper limit of the operable transmitted power of UE can be represented by formula 14:

[formula 14]

$P^{UE}=\underset{n}{\&Sigma;}\min (P_{Max}^{antenna,n},\underset{CCinAntennan}{\&Sigma;}\min \left(P_{Max}^{CC=i},\underset{Ch}{\&Sigma;}{P}_{Ch=j}^{CC=i}\right))$

After this, when independently performing power for each antenna and controlling, the operation of UE is proposed.Conveniently, in an illustrative manner, only describe two antennas, but three or more root antennas can be applied the present invention to.Define following symbol.

calculate the power distributing to n-th antenna.The power of actual allocated may be less than this power due to Power Limitation.When not having dB symbol, this can represent lineal scale.X-CH represents all physical channels (e.g., PUSCH, PUCCH, SRS or its combination) sent to antenna n.

If then 1 antenna reaches maximum power limit, and other antennas do not reach maximum power limit.In this case, perform power to every root antenna as follows to control.

Step 1: according to the maximum transmit power limit of each CC (group) as in execution mode 2, the transmitted power being used for each CC (group) can be controlled.That is, if the transmitted power sum of the channel of all antennas of each CC (group) exceedes then control transmitted power.Only when the power performing each CC (group) controls, comprise step 1.

Step 2: the maximum transmit power considering antenna, can as controlled the transmitted power of each antenna in following option.By the various methods (e.g., priority) described in application implementation mode 1 and execution mode 2, the transmitted power of control antenna can be carried out.

Option one: when using many transmitting antennas, can perform precoding, for sending.In order to make receiving terminal decode to the signal through precoding, receiving terminal should by identifying that the pre-coding matrix used in transmitting terminal performs decoding with the reverse order of transmitting terminal.But if do not keep the power ratio of antenna due to the Power Limitation of antenna, then may occur distortion in the pre-coding matrix applied from transmitting terminal, error rate increases thus.Therefore, by according to the antenna with the transmitted power limit, regulate the power not having the antenna of the transmitted power limit with same ratio, the distortion of pre-coding matrix can be prevented.That is, the transmitted power not reaching the antenna of maximum power limit reduces together with the transmitted power of the antenna exceeding power limit, makes transmission power ratio maintain identical level.If there are three or more root antennas, then according to the transmitted power of the antenna reduced with maximum rate, can with the transmitted power of identical other antennas of rate regulation.In option one, actual transmission power as follows:

[formula 15]

${\hat{P}}_{X-CH}^{antenna,n}=P_{X-CH}^{antenna,n},{\hat{P}}_{X-CH}^{antenna,m}=P_{X-CH}^{antenna,m}$

Formula 15 represents the actual transmission power when there is not Power Limitation.

[formula 16]

${\hat{P}}_{X-CH}^{antenna,n}=P_{Max}^{antenna,n},{\hat{P}}_{X-CH}^{antenna,m}=(P_{Max}^{antenna,n}/P_{X-CH}^{antenna,n})P_{X-CH}^{antenna,m}$

Formula 16 represents actual transmission power when there is Power Limitation.With reference to formula 16, because in antenna n, the transmitted power sum of channel exceedes maximum transmit power, so the actual transmission power of antenna n is restricted to maximum transmit power.Meanwhile, even if the transmitted power sum of the channel of antenna m does not exceed maximum transmit power, with ratio reduce the transmitted power of antenna m, make to keep the transmission power ratio with antenna n.

Option 2: if the power ratio of each antenna represented by power control signal cannot be kept due to the Power Limitation of any antenna, then occur distortion in the pre-coding matrix applied from transmitting terminal.If the unidentified distortion factor of receiving terminal, then receive error rate and increase.But, when passing through dedicated reference signals (DRS, Dedicated Reference Signal) when indirectly estimating the pre-coding matrix used in transmitting terminal, receiving terminal can also estimate the distortion of pre-coding matrix according to the change of the transmission power ratio of antenna.In this case, as in option one, the transmitted power of the antenna not having Power Limitation can not be reduced, to control transmission power ratio.Therefore, by clamping down on the maximum transmit power of respective antenna, the transmitted power reaching the antenna of maximum power limit can only be sent.The power used in actual transmission in option 2 is as follows:

[formula 17]

${\hat{P}}_{X-CH}^{antenna,n}=P_{X-CH}^{antenna,n},{\hat{P}}_{X-CH}^{antenna,m}=P_{X-CH}^{antenna,m}$

Formula 17 represents actual transmission power when there is not Power Limitation.

[formula 18]

${\hat{P}}_{X-CH}^{antenna,n}=P_{Max}^{antenna,n},{\hat{P}}_{X-CH}^{antenna,m}=P_{X-CH}^{antenna,m}$

Formula 18 represents actual transmission power when there is Power Limitation.With reference to formula 18, because in antenna n, the transmitted power sum of channel exceedes maximum transmit power, so the actual transmission power of antenna n is limited to maximum transmit power.Meanwhile, because in antenna m, the transmitted power sum of channel does not exceed maximum transmit power, so perform transmission when not having power to control.

Figure 12 shows BS and UE of execution mode used in the present invention.

With reference to Figure 12, wireless communication system comprises BS 110 and UE 120.In DL, transmitter is a part of BS 110, and receiver is a part of UE 120.In UL, transmitter is a part of UE 120, and receiver is a part of BS 110.BS 110 comprises processor 112, memory 114 and RF unit 116.Processor 112 can be constructed to the process that realizes proposing in the present invention and/or method.Memory 114 is connected to processor 112 and stores the various information relevant with the operation of processor 112.RF unit 116 is connected to processor 112 and sends and receive wireless signal.UE 120 comprises processor 122, memory 124 and RF unit 126.Processor 122 can be constructed to the process that realizes proposing in the present invention and/or method.Memory 124 is connected to memory 122 and stores the information relevant with the operation of processor 122.RF unit 126 is connected to processor 122 and sends and receive wireless signal.BS 110 and/or UE 120 can comprise single antenna or many antennas.

Above-mentioned illustrative embodiments is the combination of factors and characteristics of the present invention.These key elements or feature can be considered to optionally, unless otherwise mentioned.Can when not putting into practice each key element or feature with when other key elements or Feature Combination.Further, by built-up section key element and/feature, embodiments of the present invention can be constructed.The operating sequence described in embodiments of the present invention can rearrange.Some structures of any one execution mode can comprise in other embodiments, and can replace by the relative configurations of other execution modes.Obviously, execution mode can be formed by the combination of the claim without specific reference relation in appended claims, or new claim can be comprised by amendment after application.

In this document, the data input and data output relation between UE and BS is described.Here, the specific operation being described to be performed by BS can be performed by the upper node of BS.That is, it is evident that, in the network be made up of the multiple network nodes comprising BS, carry out communicating with UE and the various operations performed can be performed by BS, or can be performed by other network nodes except BS.Term BS can replace with term fixed station, Node B, e Node B (eNB), access point etc.Term UE can replace with term mobile radio station (MS), mobile subscriber station (MSS) etc.

Illustrative embodiments of the present invention can be realized by various mode (e.g., hardware, firmware, software or its combination).In hardware construction, illustrative embodiments of the present invention can by one or more application-specific integrated circuit (ASIC) (ASIC, Application Specific Integrated Circuits), digital signal processor (DSP, Digital SignalProcessors), digital signal processing device (DSPD, Digital Signal Processing Devices), programmable logic device (PLD, Programmable Logic Devices), field programmable gate array (FPGA, FieldProgrammable Gate Arrays), processor, controller, microcontroller, microprocessors etc. realize.

In firmware or software construction, illustrative embodiments of the present invention can be realized by the module, process, function etc. performing above-mentioned functions or operation.Software code can store in the memory unit and processor software code.Memory cell can be positioned at inside or the outside of processor, and can by various known way to processor transmission data with from processor reception data.

Those skilled in the art are very clear, when not departing from the spirit or scope of the present invention, can carry out various modifications and variations to the present invention.Thus, if these amendments and modification fall in the scope of appended claims and equivalent thereof, then these amendment and modification are also contained in the present invention.

Commercial Application

The present invention can be applied to wireless communication system.Particularly, the present invention can be applied to the method and apparatus for control UL transmitted power.

Claims (10)

1. communication equipment place in a wireless communication system uses multiple component carrier to send a method for signal, and the method comprises the following steps:

For each component carrier, control the transmitted power being used at least one channel simultaneously sent as follows, which is no more than for making total transmitted power of at least one channel described the maximum transmit power configured for corresponding component carrier; And

Check and whether exceed for total transmitted power of the described multiple channels sent simultaneously the total peak power output configured for described communication equipment on described multiple component carrier;

Wherein, described multiple channel comprises Physical Uplink Control Channel PUCCH and Physical Uplink Shared Channel PUSCH,

Wherein, if described total transmitted power of the described multiple channel on described multiple component carrier exceedes the described total peak power output for described communication device configured, then adjust the transmitted power of described PUSCH as follows, which is that the total transmitted power after making the adjustment on described multiple component carrier is no more than described total peak power output.

2. method according to claim 1, the method is further comprising the steps of:

Send described PUCCH and described PUSCH simultaneously,

Wherein, the first component carrier sends described PUCCH, and

Wherein, second component carrier wave sends described PUSCH.

3. method according to claim 1, wherein, via the information of peak power output total described in broadcast or radio resource control RRC message sink.

4. method according to claim 1, wherein, adjusts the described transmitted power of described PUSCH by application attenuation coefficient.

5. method according to claim 1, the method also comprises:

Wherein, even if total the described transmitted power of described multiple channel on described multiple component carrier exceedes the described total peak power output for described communication device configured, still keep the transmitted power of described PUCCH.

6. use multiple component carrier to send a communication equipment for signal in a wireless communication system, this communication equipment comprises:

Control unit, this control unit is configured to for each component carrier, control the transmitted power being used at least one channel simultaneously sent as follows, which is no more than for making total transmitted power of at least one channel described the maximum transmit power configured for corresponding component carrier; And

Inspection unit, this inspection unit is configured to check whether exceed for total transmitted power of the described multiple channels sent simultaneously the total peak power output configured for described communication equipment on described multiple component carrier;

Wherein, described multiple channel comprises Physical Uplink Control Channel PUCCH and Physical Uplink Shared Channel PUSCH,

Wherein, if described total transmitted power of the described multiple channel on described multiple component carrier exceedes the described total peak power output for described communication device configured, then adjustment unit is configured to the transmitted power adjusting described PUSCH as follows, and which is that the total transmitted power after making the adjustment on described multiple component carrier is no more than described total peak power output.

7. communication equipment according to claim 6, this communication equipment also comprises:

Radio frequency unit, this RF unit is configured to send described PUCCH and described PUSCH simultaneously,

Wherein, the first component carrier sends described PUCCH, and

Wherein, second component carrier wave sends described PUSCH.

8. communication equipment according to claim 6, wherein, via the information of peak power output total described in broadcast or radio resource control RRC message sink.

9. communication equipment according to claim 6, wherein, adjusts the described transmitted power of described PUSCH by application attenuation coefficient.

10. communication equipment according to claim 6, this communication equipment also comprises:

Wherein, even if total the described transmitted power of described multiple channel on described multiple component carrier exceedes the described total peak power output for described communication device configured, power holding unit is configured to the transmitted power still keeping described PUCCH.