CN101627554B - Combined open loop/closed loop method for controlling uplink power of a mobile station - Google Patents

Abstract

A method and apparatus are disclosed comprising a combined open loop/closed loop uplink power control scheme for E-UTRA. The combined open and closed loop method for UL intra-cell PC controls the wireless transmit receive unit (WTRU) transmit power spectral density (PSD), PSDTx, (e.g. power per RB).

Description

Be used for the open/close method of the combination of controlling mobile radio station up-link power

Technical field

The present invention relates to wireless communication system.

Background technology

For evolved universal terrestrial radio access (E-UTRA) up link (UL), there is many through-put power controls (TPC) motion to consign to 1 (WG1) of third generation partner program (3GPP) Long Term Evolution (LTE) working group.These motions are divided into (at a slow speed) open loop TPC and closed loop or the TPC based on channel quality information (CQI) at a slow speed conventionally.

Open loop TPC measures and system parameters based on path loss, and path loss is measured at wireless transmitter/receiver unit (WTRU) and located to carry out herein, and system parameters is provided by evolved Node B (e Node B).

Closed loop TPC is the TPC feedback information based on periodically sending from e Node B typically, and (such as TPC order), feedback information utilizes the Signal to Interference plus Noise Ratio (SINR) of measuring in e Node B to obtain conventionally herein.

Open loop TPC can compensate long-term channel and change (for example path loss and shadow fading), for example, in an efficient way, does not need the record of through-put power.But open loop TPC typically causes path loss measure error and through-put power step-up error.On the other hand, because the feedback signal based on being sent by e Node B, closed loop or the TPC based on CQI are more insensitive for the error of measuring and through-put power arranges at a slow speed.But when because UL Transmission, or feedback transmission is interrupted or channel variation is very violent and while thering is no available feedback, the performance of closed loop or the TPC based on CQI reduces at a slow speed.

For UL E-UTRA, there is PC motion in many communities to consign to the #1 of third generation partner program (3GPP) Long Term Evolution (LTE) working group (WG).These motions can be divided into open loop PC at a slow speed and closed loop (or PC) based on CQI at a slow speed conventionally.Open loop PC can compensate long-term channel to be changed, and (for example path loss and shadow fading), for example, in an efficient way, does not need the record of through-put power, but it typically stands the error that path loss is measured and through-put power arranges.On the other hand, closed loop or the PC based on CQI are more insensitive for the error of measuring and through-put power arranges at a slow speed, because it is the feedback signal based on being sent by e Node B.But, when because UL Transmission, or feedback transmission interrupt and while thering is no available feedback its performance reduce.

Therefore need a kind of improved transmission power control method.

Summary of the invention

A kind of method and apparatus of the open/close up-link power control program that comprises combination for E-UTRA is disclosed.This is used for transmit power spectral density (PSD) PSD of the open loop/closed loop method control wireless transmission receiving element (WTRU) of the combination of PC in UL community _tx(power of for example every RB).

Accompanying drawing explanation

According to following description related to the preferred embodiment, can understand in more detail the present invention, these preferred implementations provide by way of example, and can understand by reference to the accompanying drawings, wherein:

Fig. 1 is example wireless communication system;

Fig. 2 is the example block diagram that is configured to the transmitter and receiver of realizing disclosed power control (PC) method;

Fig. 3 shows the example of the PC method timing of disclosed combination;

The example of disclosed combined power control method when Fig. 4 shows TTI (inter-TTI) when interval and is 1 (1);

Fig. 5 shows another example of the PC timing of disclosed combination in the time that the TTI at interval is 2 (2);

Fig. 6 shows the example of the disclosed PC scheme that comprises discontinuous transmission (DTX) combination;

Fig. 7 shows the example for the disclosed PC method of n updated time; And

Fig. 8 shows disclosed combination Open loop and closed loop method for determining the flow chart of TPC.

Embodiment

In the time below mentioning, term " wireless transmitter/receiver unit (WTRU) " includes but not limited to the subscriber equipment of subscriber equipment (UE), mobile radio station, fixing or moving user unit, beep-pager, cell phone, personal digital assistant (PDA), computer or any other types that can move in wireless environment.In the time below mentioning, term " base station " includes but not limited to the interface equipment of Node B, controller of platform, access point (AP) or any other types that can move in wireless environment.

Fig. 1 illustrates an exemplary wireless communication network (NW) 10, and this NW 10 comprises WTRU 20, one or more Node B 30, and one or more community 40.Each community 40 comprises one or more Node B (NB or eNB) 30, and this Node B 30 comprises the transceiver 120 that is configured to realize disclosed through-put power control (TPC) method.WTRU 20 comprises the transceiver 110 that is configured to equally realize disclosed TPC method.

Fig. 2 is the functional block diagram that is configured to the transceiver 110,120 of carrying out disclosed method.Except being included in typical emittor/receiver, be outside the parts in WTRU or Node B, transceiver 110,120 comprises processor 115,125, with processor 115, the receivers 116,126 of 125 communications, with the transmitter 117 of processor 115,125 communication, 127 and with receiver 116,126 and transmitter 117,127 communicate by letter to contribute to the antenna 118,128 of wireless data transmission and reception.And receiver 126, transmitter 127 and antenna 128 can be single receiver, transmitter and antennas, or can comprise respectively multiple independent receivers, transmitter and antenna.Transmitter 110 can be positioned at WTRU or multiple radiating circuit 110 can be positioned at base station.Receiver 120 can be positioned at WTRU or Node B or be positioned at WTRU and Node B simultaneously.

The method of disclosed TPC comprises the open loop closed loop policy for the combination of up link (UL) community internal power control.The method is included as UL data channel control channel and sound reference symbol (SRS) is controlled WTRU transmit power spectral density (PSD) or PSD transmission (PSD _tX), for example power of every Resource Block (RB), or the WTRU through-put power of use open loop and periodic close-loop power control (PC).If the Signal to Interference plus Noise Ratio (SINR) that UL MCS/ authorised representative receives in Node B, uses UL CQI (CQI) (or modulating-coding collection (MCS)/authorization message) to proofread and correct open loop and/or measure error at WTRU.If there is no available CQI, only carry out open loop.Can use implicit command signaling for closed loop component, for example, there is no signaling consumption.Alternatively, can use explicit TPC command signaling at DL control channel for closed loop component.And disclosed method can Fast Correction open loop error, the performance having obtained.

Point out as above-mentioned, disclosed method comprises controls WTRU transmit power spectral density (PSD) or PSD transmission (PSD _tx), for example every Resource Block (RB) power or through-put power.Although it should be noted in the discussion above that disclosed method comprises control transmission PSD, it is equal to control through-put power.PSD _txbe defined as:

PSD _tx=PSD _open+ α Δ _closed+ Δ _mCS; Formula (1)

Wherein PSD _openthe open loop PSD based on path loss that representative represents with dBm; Δ _closedbe the capability correction factor definite based on closed loop component, will be explained below; Δ _mCSit is the power bias of the MCS of each mandate; α makes the effectively weighted factor of (α=1) or invalid (α=0) of closed loop component according to the availability of down link (DL) control channel, and it embeds in closed loop PC (correction) command signaling (explicit or implicit expression).Weighted factor can be determined by the existence of spontaneous detection closed loop PC command signaling by WTRU 20.Alternatively, by the high-level signaling notice WTRU 20 about command signaling location from e Node B 30.Transmission PSD should be no more than maximum transmitted PSD PSD _max, wherein PSD _maxbased on maximum allowable power P _maxobtain, maximum allowable power depends on UE power grade, for example PSD _max=P _max/ M, wherein M is the size that is effective to the UL channel resource allocation of the quantitaes with Resource Block of given subframe.

In the community proposing in formula (1), PC scheme can be used with the PSD based on open loop and be in a ratio of the absolute capability correction factor.According to formula (1), can be expressed as at the WTRU of n updated time Tx PSD:

PSD _Tx(n)＝PSD _open(n)+α·Δ _closed(n)+Δ _MCS(n)

＝PSD′ _Tx(n-1)+(PSD _open(n)-PSD _open(n-1))+α·(Δ _closed(n)-Δ _closed(n-1))+Δ _MCS(n)；

Formula (2)

Wherein PSD ' _tx(n-1) expression does not comprise (n-1) individual TxPSD of the power bias of the MCS of each mandate, by PSD ' _tx(n-1)=PSD _tx(n-1)-Δ _mCS(n-1) provide.

Typically, all MCS of power bias known to(for) single mandate of WTRU and e Node B.

The processor 115 Open loop and closed loop PCs of combination based on path loss of WTRU 20 are to determine PSD _tX.According to disclosed method, first WTRU 20 carries out the open loop PC (PSD based on path loss measurement and system parameters _open).PSD _openbe calculated as follows:

PSD _open＝PSD _target+L(dBm)；

Formula (3)

Wherein

● PSD _targetbe the target P SD receiving in service e Node B 30, it is preferably the special parameters an of WTRU (or subgroup of WTRU).Target P SD can for example, adjust by outer loop mechanism according to service quality (QoS) (target Block Error Rate (BLER)), can be also the function of path loss, carrys out a part for compensating for path loss.Target P SD _targetsignaling according to take at a slow speed for basic adjustment is via the high-level signaling execution from Node B 30 to WTRU 20; And

● L is from the path loss of the filtration representing with dB of service e Node B 30 to WTRU 20, comprises shadow fading, and wherein first WTRU 20 measures instant path loss based on the known DL reference signal (RS) of through-put power.Then filter method is applied to path loss by WTRU 20.For example,, at the path loss of the filtration in k moment, L _k, can calculate like this:

L _k=ρ L _k-1+ (1-ρ) L _k; Formula (4)

Wherein L _k-1and L _krepresentative is in the path loss of the filtration in (k-1) individual moment with in the instant path loss in k moment; ρ is filter coefficient, and 0≤ρ≤1 is determined by WTRU20 conventionally, for example depends on path loss variation, rapid fading rate, UL transmission time and other.The filtration of path loss can complete 2/3 layer of physics (PHY) layer and/or L.

Once WTRU 20 determines open loop component, processor 115 just calculates closed loop component.Just as known to the skilled person, there is open loop correlated error, comprise the WTRU Tx infringement causing due to the path loss evaluated error that does not have complete reciprocity to cause with due to nonlinear power amplifier in the UL of FDD and DL.In order to compensate such error to keep the quality of power-controlled channel together with aimed quality, WTRU is applied to the PSD based on open loop with the form of the closed loop PC suc as formula in (1) (or formula (2)) by correction.

The WTRU (or subgroup of the WTRU being scheduled) that service e Node B 30 is scheduled for each UL determines WTRU special (absolute and/or accumulate) PC corrective command.Preferably, e Node B 30 is used the reference of power-controlled data channel as corrective command.The UL that consequent corrective command sends by the control channel the 1st layer of DL or the 2nd layer authorizes and/or DL scheduling channel is signaled WTRU 20 (or subgroup of the WTRU being scheduled).Corrective command can be only with specific (predefined) HARQ process, the UL that for example each HARQ process 1 is associated is signaled in authorizing.

In the time that WTRU 20 places receive corrective command, the processor 115 of the WTRU 20 just corrective command based on proposing (or corrective command of accumulation) is determined correction factor Δ _closed:

Δ _closed=f (PC correction command (s)); Formula (5)

Wherein Δ _closedcan use the value that one group of multistep is long, for example, use { +/-4, the +/-1dB} of 3 bits command.

Alternatively, e Node B 30 is authorized and may in the DL of DL control channel scheduling, use multiple Command field bits at UL, for example 3 bits, to each WTRU being scheduled 20 (or subgroup of the WTRU being scheduled) transmitted power correction factor, the wherein preferably link-quality based on the power-controlled data channel of UL (such as the PSD or the SINR that receive) definite (with possible UL sound reference symbol, if available) of corrective command.For example, suppose one group of capability correction factor values be have 3 bits 7, +/-5, +/-3, +/-1,0dB}, correction factor can according to lower determine

formula (6)

Wherein ESINR _estand SINR _targetrepresent respectively estimating and target SINR at effective SINR of receiver (ESINR) of the power-controlled channel that represents with dB.[x] representative approaches the corrected value of x most in calibration set, and this value and x are the most approaching.The sampling of measurement of estimating for ESINR in e Node B comprises the SC-FDMA symbol of the power-controlled channel of (some or all of) UL, and the last time in DL, it was received since corrective command signaling.

In order to reduce command signaling expense, need to not authorize at each UL in (if with use, in each DL scheduling) and have corrective command.Namely, corrective command can send (for example,, at every N authorization channel or every N Transmission Time Interval (TTI), wherein N is the configurable parameter that is less than or equal to the minimum UL PC update cycle) in the pre-configured signaling time.

Take each WTRU as basis in e Node B 30 places (or in RRC grade) arrangement corrects command signaling timing, thereby known via high-level signaling in e Node B 30 and WTRU 20.

In the time that corrective command signals in UL authorizes, suppose that UL HARQ is synchronous, signaling timing configured can be simplified, so that command signaling is authorized at specific UL, authorize such as the UL being associated with predefined HARQ process, for example, in HARQ process #1, carry out.But, even in this case, also need in all relevant UL authorization channels, not signal corrective command.For example, signaling can occur in every N relevant authorization channel, N >=1, and this is equivalent to there is a command signaling at every N HARQ cycle period.Signaling timing (or relevant parameter) can reconfigure with semi-static speed.

Fig. 3 shows in the UL that PC corrective command is being associated with HARQ process #1 authorizes and transmits, and N is set to an example of 2 o'clock disclosed PC methods.In this example, PC renewal rate is 8 milliseconds, and the quantity of supposing HARQ process is 4, and the Transmission Time Interval at interval (TTI) equals 1.

When WTRU 20 has received a corrective command (or may accumulated correction order) multiple UL authorize from service e Node B 30 since last Tx PSD adjusts in UL authorizes, it by from the corrective command receiving (if or receiving while exceeding an order multiple corrective commands in conjunction with rear) obtain correction factor Δ _closed, adjust for next PSD.

Then WTRU 20 utilizes the correction factor obtaining, nearest open loop PSD and the power bias being associated with mandate MCS, according to formula (1) (or formula (2)), the transmission PSD of data channel is adjusted.Consequent Tx PSD will be applied to as the starting (first SC-FDMA symbol) most and remained unchanged before next PSD adjusts of the next UL TTI of data channel, as shown in Figure 3.

Fig. 4 shows an example of the timing of the PC method of disclosed combination, suppose that UL HARQ is the synchronization scenario with 4 HARQ processes, and WTRU 20 is scheduled in each TTI (TTI=1 at for example interval) packet of transmission (a for example HARQ process).In addition, e Node B 30 only sends PC corrective command in the UL being associated with HARQ process 1 authorizes.In this case, the WTRU Tx power update cycle is 4 TTI (for example 4 milliseconds).

As shown in Figure 4, in initial UL transmission, because there is no available PC corrective command, WTRU20 only arranges its through-put power based on open loop component (that is to say that the weighted factor in formula (1) is zero).The next HARQ transmission time (HARQ circulation timei) before, in the authorization channel of e Node B 30 in the DL control channel of HARQ process 1 association, send corrective command, wherein the link-quality (power or SINR) of this order based on the first two HARQ process determined.If WTRU20 correctly receives corrective command, the WTRU 20 then Open loop and closed loop scheme based on combination calculates its transmission PSD _tX, and by PSD _tXbe applied to HARQ process below.

Fig. 5 for example understands another example of the PC timing of disclosed combination, and wherein the TTI at interval is 2.In this case, the UL PC update cycle is 8 TTI (8 milliseconds).

For example, when not closed-loop corrected order recently (, because the UL transfer of data of scheduling recently, that is, UL DTX), WTRU 20 can be by relying on open loop that its Tx PSD is set.In this case, the weighted factor in formula (1) as being set to 0 during initial Tx PSD arranges.

Alternatively, the path loss variation between the time that WTRU 20 can be based on before DTX and the time before recovering UL transmission arranges Tx PSD.If UL DTX is very short, WTRU can be set to 0 by α and utilize formula (2), therefore

PSD _tx(n)=PSD ' _tx(n-1)+(PSD _open(n)-PSD _open(n-1))+Δ _mSC(n) formula (7)

Wherein n recovers UL to transmit previous Tx PSD setup times, and (n-1) is DTX PSD setup times before.Timing example is in this case shown in Figure 6.

In another is replaced, WTRU 20 can apply the power bias with respect to up-to-date PSD to Physical Uplink Control Channel (PUCCH), if available.Even without UL transfer of data, also there is the UL control signal (such as CQI and ACK/NACK) for DL.In this case, because UL control channel is also power-controlled based on formula (1), (but using different parameters and renewal speed), can be used as follows for the UL control channel Tx PSD of data channel Tx PSD:

PSD _tx(data)=PSD _tx(control)+Δ _control(data, control) formula (8)

Wherein PSD _tx(control) be UL control channel up-to-date PSD (or recently upgrade in average PSD), Δ _control(data, control) representative control channel power bias relevant to the Tx PSD that uses data.

If the DTX cycle is very long, the PSD of WTRU 20 so _tXcan be as initial PSD _tXsituation about arranging is only determined immediately based on open loop like that after DTX.

Fig. 7 shows an example of the PC scheme of the combination of proposal, comprises DTX.

Typically, the UL authorized appropriation in DL control channel (for example, the MCS of distribution and TBS) is closely related with the link-quality (such as the PSD or the SINR that receive) of UL transfer of data.Disclose another method, wherein e Node B 30 processors 125 can authorize (MCS and TBS) for example, so that authorized appropriation represents the link-quality (SINR) receiving in e Node B 30 for WTRU 20 distributes UL.In this case, WTRU 20 can obtain its Tx PSD as follows:

PSD _tx=PSD _open+ α f (UL authorized appropriation, SINR _t)+Δ _mCS(dBm); Formula (9)

Wherein PSD _open, α, and Δ _mCSidentical with above-mentioned definition respectively.F (UL authorized appropriation, SINR _t) be the correction factor representing with dB, the capability correction factor Δ in its replacement formula (1) _closed.SINR _tthe target SINR representing with dB.Based on the correction factor f (UL authorized appropriation, the SINR that authorize _t) can be expressed as follows:

F (UL authorized appropriation, SINT _t)=SINR _t-E{SINR _est(UL authorized appropriation) }; Formula (10)

Wherein SINR _est(UL authorized appropriation) represents that the SINR that the WTRU 20 of e Node B reception is obtained by UL authorized appropriation estimates.E{SINR _estthe time average of SINR estimated of representative, for example

E{SINR _est(grant ^k)=ρ E{SINR _est(grant ^k-1)+(1-ρ) E{SINR _est(grant ^k) formula (11)

Wherein grant ^krepresent k the UL authorized appropriation receiving, ρ is homogenizing filter coefficient, 0≤ρ≤1.At the SINR of WTRU _est(UL authorized appropriation) estimated can be based on authorizing (MCS, TBS) mapping table, its can be on semi-static basis by high-level signaling by network configuration.

Similar with formula (1), the correction factor in formula (8) can be for compensation open loop error.The UL that the major advantage of use formula (8) is at DL L1/L2 control channel does not need explicit corrective command signaling (causing the signaling consumption of minimizing) in authorizing, and formula (1) (and formula (2)) need to be authorized at UL the display command that will send in (and/or DL scheduling).Use formula (3), closed loop component can for example,, based on UL authorized appropriation (MCS and/or TBS), not have explicit corrective command signaling in the UL of DL L1/L2 control channel authorizes.

But, in some situation of for example, not mating (that is to say, the MCS of distribution can not correctly represent the SINR receiving) such as continuous dispatching and mandate (MCS), can not apply formula (9).Therefore, WTRU Tx PSD arranges and can between formula (1) and formula (8), switch.

By high-rise correction factor type signaling, wherein e Node B 30 (or network 10) is used which formula (formula (1) or formula (8)) for WTRU Tx power setting to WTRU 20 transmitted signal notices.In this case, preferably correction factor type signal can be configured by network 10 on semi-static basis and each WTRU basis.

Alternatively, 1 bit MCS mismatch designator can be introduced to DL L1/2 control signal.For example, bit 1 can be used to indicate use formula (1), and bit 0 can be used for indicating type (8).

In another alternative, can be with showing one in corrective command grade use that comes indicating type (8).This alternative assumption (1) is the PC method of acquiescence.Similarly, e Node B 30 arranges a use that comes indicating type (8) in the corrective command grade of UL in authorizing.For example, in the time that the corrective command in formula (8) has 3 bit long, for WTRU 20 arranges in 8 order grades, for example ' 000 ', carry out use formula (8).

Fig. 8 shows the flow chart of the Open loop and closed loop method of the disclosed combination of determining TPC.By determining target power spectrum density PSD _target(step 800) and through the path loss (L) (step 801) of filtering, the processor 115 of WTRU 20 is measured and is carried out open Loop Power control based on path loss.Then WTRU 20 uses the power control corrective command receiving by UL authorization channel at receiver 116 to determine closed loop component (step 802).Once receive corrective command, receiver 116 is forwarded to processor 115 by corrective command to determine correction factor Δ _closed(step 803).Then processor 115 calculation correction factor Δ _closed(step 804).Then processor 115 by open loop PC and closed loop component in conjunction with to determine through-put power control (step 805).

In the disclosed method of for example, TPC for irregular data (VoIP), WTRU has multiple choices that its TX PSD:i is set) only rely on open loop PSD, ii) for closed loop part, e Node B is authorized at particular moment (immediately) transmission UL, and wherein UL authorizes and transmits corrective command.In this case, UL grant format (and/or corrective command form) can be different from the form of the data for being scheduled; If or iii) available, will be applied to PUCCH with respect to the power bias of up-to-date PSD (or in renewal recently average PSD).

formula (12)

Wherein P ₀the cell-specific parameter (representing with dBm) that comprises UL level of interference etc., its by e Node B via high-level signaling transmitted signal.

● SINR _targetbe the special parameters (representing with dB) of WTRU (or subset of WTRU), allowing e Node B is that UE (or subset of UE) arranges the grade of service.For Serving cell and some neighbor cells, SINR _targetit can be the function of path loss.SINR _targetcan on semi-static basis, be configured by service e Node B, then transmit a signal to UE (or subset of UE) via high-level signaling;

● PL is downlink path-loss (representing with dB);

● λ is the cell-specific path loss compensating factor for Partial Power control, wherein 0 < α <=1.α can be configured on semi-static basis by e Node B and notify via high-level signaling transmitted signal;

● Δ _closedbe the capability correction factor representing with dB, it is determined based on closed loop mechanism;

● ∝ makes the effectively weighted factor of (∝=1) or invalid (∝=0) of closed loop component, depends on the availability of the DL control channel of the closed-loop corrected order of carrying.This weighted factor is determined by WTRU automatically via detecting the existence of PC corrective command.Suppose the place and the time that exist about command signaling via the high-level signaling notice WTRU from e Node B.For example,, in initial UL transmission, because not from the available corrective command of e Node B, WTRU arranges ∝=0;

● Δ _mCSit is the power bias of the MCS of each mandate.Typically, all power bias of the MCS of known single mandate of WTRU and e Node B.

Because the known Δ using to stable condition of e Node B 30 _mCS, in the time that it determines corrective command by the PSD (or SINR) as a result of receiving is compared with the target level of being determined by network 10, e Node B 30 can obtain Δ from the PSD receiving _mCSvalue.

As mentioned above, compared with PSD based on open loop, this disclosed method is used absolute power correction factor.Equally, according to formula (12), be expressed as follows at the WTRU of n update status Tx PSD:

PSD _Tx(n)＝PSD _open(n)+α·Δ _closed(n)+Δ _MCS(n)

＝PSD′ _Tx(n-1)+(PSD _open(n)-PSD _open(n-1))+α·(Δ _closed(n)-Δ _closed(n-1))+Δ _MCS(n)

Formula (13)

Wherein PSD ' _tx(n-1) expression does not have (n-1) individual Tx PSD of the power bias of the MCS of each mandate,

It is by PSD ' _tx(n-1)=PSD _tx(n-1)-Δ _mSC(n-1) provide.

Because total WTRU through-put power is by being expressed as P _maxthe maximum transmission power grade restriction of WTRU, by P _txthe total WTRU through-put power representing, is expressed as:

P _tx=min{P _max, (10log ₁₀(M)+PSD _tx) (dBm); Formula (14)

Wherein M is the quantity of the RB of distribution.

Therefore, actual WTRU transmission PSD can be expressed as:

${\mathrm{PSD}}_{\mathrm{Tx}}^{\mathrm{actual}}=P_{\mathrm{Tx}}-10\&CenterDot;{\log }_{10}\left(M\right)\left(\mathrm{dBm}\right)$ Formula (15)

It should be noted that the UL PC in formula (15) is realized by the processor 115 of WTRU 20.

According to the disclosed PC method for irregular data, it is as follows that WTRU 20 calculates open loop PSD:

PSD _open=P ₀+ SINR _target+ λ PL (dBm) formula (16)

Wherein

● target SINR, SINR _target, can adjust by outer loop mechanism according to service quality (QoS) (as target BLER) in service e Node B 30, and can be also the function that path loss is measured for Serving cell and neighbor cell; And

● PL is the path loss through filtering from service e Node B to WTRU representing with dB, comprises shadow fading.WTRU constantly (or periodically) measure instant path loss based on DL RS, the through-put power of the known DL RS of WTRU.Then filtering method is applied to the measurement of path loss, for example

PL _k=ρ PL _k-1+ (1-ρ) PL _kformula (17)

Wherein PL _kand PL _k-1be illustrated respectively in k and the path loss through filtering in (k-1) moment.L _kthe instant path loss in k moment.ρ is filter coefficient, 0≤ρ≤1, and it is determined by WTRU 20 conventionally, depends on path loss variation, rapid fading rate, UL transmission time etc.Alternatively, can consider mobile homogenization process for path loss filtering.

Disclose similarly with above-mentioned, closed loop component is determined by processor 115.

formula (18)

Wherein ESINR _estand SINR _targetrepresent that respectively the power-controlled channel representing with dB is at effective SINR of receiver (ESINR) estimation and target SINR.[x] represents a corrected value in calibration set, and it approaches x most.

Similar with above-mentioned disclosed method, when send corrective command with signal in UL authorizes time, suppose that UL HARQ is synchronous, can be configured to make command signaling to authorize in the UL mandate as being associated with predefined HARQ process and carry out at specific UL the simplified signaling time.

For example, for irregular data (VOIP), when closed-loop corrected order recently not (for example, because the UL transfer of data of scheduling recently,, UL DX), WTRU 20 can arrange its Tx PSD by dependence open loop: in this case, the weighted factor ∝ in formula (13) is set to 0 as the situation that initial Tx PSD arranges.The WTRU 20 alternatively path loss variation between the time based on before DTX time and recovery UL transmission before arranges its TX PSD: if UL DTX is very short, WTRU can be set to 0 by β and carry out use formula (2), thereby

PSD _tx(n)=PSD ' _tx(n-1)+(PSD _open(n)-PSD _open(n-1))+Δ _mCS(n); Formula (19)

Wherein n recovers UL transmission Tx PSD setup times before, (n-1) is DTX PSD setup times before.Fig. 4 shows an example of this situation.

Alternatively, if available, WTRU 20 can be applied to PUCCH by the power bias with respect to nearest PSD.Immediately there is no UL transfer of data, can have the UL control signal (such as CQI and ACK/NACK) for DL yet.In this case, because UL control channel (PUCCH) is also power-controlled based on formula (12), (but use different parameters and renewal speed), UL control channel (PUCCH) Tx PSD can be as follows for the Tx PSD of data channel (PUSCH):

PSD _tx(PUSCH)=PSD _tx(PUCCH)+Δ _control(PUSCH, PUCCH); Formula (20)

Wherein PSD _tx(PUCCH) be the PSD (or PSD what recently upgrade average) nearest for UL control channel (PUCCH), Δ _control(PUSCH, PUCCH) represents control channel (PUCCH) power bias with respect to the Tx PSD of PUSCH.

For sound pilot tone, its Tx PSD PSD _tx(pilot) can be with respect to data TX PSDPSD _tx(data) be offset a pilot power biasing, thereby

PSD _tx(pilot)=PSD _tx(data)+Δ _pilot(data, pilot) formula (21)

Wherein Δ _pilot(data, pilot) represents pilot power biasing, and it can be the WTRU special parameters being configured on semi-static basis by e Node B.

For the control signal in UL, preferably use different parameter (such as target P SD) and with respect to data renewal speed faster.In addition, we are more preferably control channels itself for the reference channel of measuring for corrective command of control signal, and transmit in DL scheduling for the corrective command of controlling.Can be from for data for the bit number of the corrective command controlled different, the quantity of Command field bit can be the semi-static configurable parameter on each WTRU basis here.For example, but we can maintain the relative average power biasing between data and control channel,

E (PSD _tx(data))=E (PSD _tx(control))+Δ _control(data, control) formula (22)

Wherein

* E (PSD _tx(data) the mean P SD for data channel that) expression represents with dBm;

* E (PSD _tx(control) the mean P SD for control channel that) expression represents with dBm; And

* Δ _control(data, control) is the power bias between data channel and control channel.

In another disclosed UL PC method, use and there is the combination open/close UL PC that the interference for sharing data channel suppresses.According to this method, WTRU 20 is the PSD of its transmission of UL channel control.For example, if the allocated bandwidth of WTRU 20 (RB distributes) changes, the total through-put power of WTRU also changes so that PSD remains unchanged so.

As described in above-mentioned disclosed method, WTRU 20 carries out the open loop PC based on path loss measurement and system parameters.Then WTRU 20 uses the form of some closed loop PC to proofread and correct its PSD with compensation open loop error.Should be noted that the WTRU being scheduled for each UL, be periodically used for AMC and scheduling from e Node B 30 transmitted signal notice CQI information.Therefore, the closed loop PC component of method of the present disclosure need to be by any extra PC order of e Node B transmitted signal.In order to suppress the presence of intercell interference between neighbor cell, WTRU 20 will merge from the interference load designator of strong neighbor cell.

According to this method, share data channel for UL, in initial transmission phase, WTRU 20 obtains the PSD PSD of its transmission based on DL reference signal (RS) _txas follows:

PSD _tx=SINR _t+ PL+IN ₀+ K+ Δ (IoT _s)-10log10 (BW _rUn _rU); Formula (23)

Wherein SINR _tthe target SINR representing with dB in service e Node B 30.PL is the path loss from service e Node B 30 to WTRU 20 representing with dB, comprises shadow fading, and WTRU20 is based on the loss of DL RS measuring route here, and WTRU 20 is via the through-put power of the 2nd layer of DL/the 3rd layer of known DL RS of signaling, IN ₀be that the UL representing with dBm disturbs and noise power, it is measured at service e Node B 30 places.K is the power control nargin being arranged by service e Node B 30.

Preferably the target SINR of WTRU 20 (or subgroup of WTRU) is according to using outer shroud PC project setting in the link quality metric (such as BLER) of service e Node B 30.In addition, UL multiple-input and multiple-output (MIMO) in the situation that, this target SINR also depends on selected MIMO pattern, and it is considered for given link-quality, the SINR that different MIMO patterns need to be different.Δ (IoT _s) representing UL load step size, it is UL interference load (for example heat interference) the designator IoT of strong neighbor cell _sfunction, measure and determine based on path loss from single neighbor cell to WTRU 20 at WTRU 20 in this strongest neighbor cell.Suppose that each community 40 periodically broadcasts UL interference load bit (similar with the relative authorization in HSUPA), so that WTRU 20 can be to decoding from the indication bit of selected the strongest neighbor cell.

For example, Δ (IoT _s) can calculate as follows:

Wherein δ is predefined system parameters, for example, δ=-1 or-2dB.By using Δ (IoT _s), can alleviate the presence of intercell interference between neighbor cell.

Because the interference to other community that the WTRU of center of housing estate causes than the WTRU of cell edge is less, the segmentation of load step size is considered as follows:

WTRU 20 can, for example path loss ratio based between He Qiang neighbor cell, its Serving cell determines that it is positioned at cell edge or inside, community.

(if the strongest neighbor cell of path loss Serving cell-path loss) < R (dB), x=4;

Wherein R is illustrated in the virtual boundary layer between inner region, community and cell edge region.Parameters R can semi-statically be broadcasted by e Node B 30.

After initial transmission phase, WTRU 20PSD _tXbe calculated as follows:

PSD _tx=SINR _t+ PL+IN ₀+ K+ Δ (IoT _s)+α f (CQI, SINR _t)-10log10 (BW _rUn _rU) formula (24)

Wherein f (CQI, SINR _t) be the correction factor based on UL CQI and corresponding target SINR, serve e Node B 30 herein and signal CQI and target SINR; α, 0≤α≤1 herein, is according to channel situation and the definite weighted factor of CQI availability (or UL Transmission).For example, in the case of due to do not have the UL transfer of data of scheduling do not have UL CQI (UL MCS or authorization message) from e Node B 30 available, this weighted factor is set to 0, represents that WTRU 20 only depends on open loop PC (for example for Random Access Channel (RACH) PC); Otherwise it is set to less than or equals 1 (1).

Correction factor f (CQI, SINR in formula (24) _t), for compensating the error that open loop PC is relevant, this correction factor comprises that the path loss measure error causing due to the incomplete reciprocity between the UL in FDD and DL and WTRU 20 transmitters that cause due to the non-linear amplification of WTRU transmitter power damage (impairment).In addition, correction factor is for compensating the aimed quality mismatch causing due to different channels situation.Thereby, in company with given aimed quality (as the target SINR) quality of holding power controlled channel together.

Consider that UL CQI (UL MCS or authorization message) is illustrated in the SINR that e Node B 30 receives, correction factor can calculate like this,

F (CQI, SINR _t)=SINR _t-E{SINR _est(CQI) } (dB); Formula (25)

Wherein SINR _est(CQI) represent that the SINR that e Node B receives estimates, WTRU obtains this value from UL CQI feedback.E{SINR _est(CQI) } in time average of SINR estimated in representative, for example, by following formula:

E{SINR _est(CQI ^k)=ρ E{SINR _est(CQI ^k-1)+(1-ρ) E{SINR _est(CQI ^k); Formula (26)

Wherein CQI ^krepresent k the CQI receiving, ρ is homogenizing filter factor, 0≤ρ≤1.

Correction factor the above-mentioned formula (25) providing by the difference between target SINR and estimation SINR (obtaining from the CQI of report) represents the open loop PC correlated error of needs compensation.

The maximum power value P that the total through-put power of WTRU should represent with dBm respectively _maxwith minimal power values P _minbetween, minimum and maximum performance number is based on WTRU classification herein.

Preferably e Node B 30 use signal transmission parameters, comprise target SINR value SINR _t, should be SINR _twTRU (or subgroup of WTRU) special parameters, target SIR can be by adjusting as the outer loop mechanism of target BLER based on QoS herein.Target SINR can also be the function that path loss is measured.In the time adjusting, the signaling of target SIR is carried out via L1/2 control signal in band.Power control nargin K as e Node B special parameters also can be notified by e Node B 30 transmitted signals.K is preferably semi-static and send signal via broadcast channel (BCH).Even if should be noted that K adopts the mode of independent transmitted signal together with other parameter, it also can be embedded in target SINR, that is to say SINR _t(after embedding)=SINR _t+ K (dB).In this case, WTRU 20 does not need the explicit signaling of K.

E Node B 30 also transmitted signal notifies total UL to disturb and noise level, IN ₀, average in the subset of its subcarrier in all uses (or RB) or subcarrier.This parameter preferably obtains (and may via BCH transmitted signal) by service e Node B 30.The renewal speed of this signaling is conventionally relatively slow.Minimum and maximum UL performance number P _maxand P _minalso notified by e Node B 30 transmitted signals.Each in them can be WTRU performance rely on parameter or can by e Node B 30 clearly transmitted signal notify.

UL channel quality indicator CQI (for example UL MCS or authorization message), its object that is sent out at first signal notice is UL AMC (having once the maximum signaling rate of every TTI, for example 1000Hz).

CQI mapping ruler that e Node B generates for CQI feedback (or skew) between CQI and the SINR of measurement.This rule or parameter can be combined into target SINR.In this case, do not need the demonstration signaling of rule (or parameter).

From the UL interference load designator of each e Node B.

Semi-static parameter R, represents the virtual boundary layer between inner region, community and cell boarder region.

Disclosed PC method does not need except the above-mentioned system parameters of listing, comprise the additional feedback PC order outside target SINR, area interference/noise level and interference signal through-put power and persistent value, it can broadcast at a slow speed (or directly transmitted signal is notified) to WTRU on basis.

In order to meet the requirement of E-UTRA, it is designed to flexibly and is adapted to dynamical system/link parameter (target SINR and presence of intercell interference load state) and channel conditions (path loss and shadow fading).

Further, method of the present disclosure and other link adaptation scheme compatibility such as AMC, HARQ and adaptivity MIMO.

Suppress in interchangeable method a presence of intercell interference, replace from each e Node B broadcast interference load designator, service e Node B 30 can be adjusted the presence of intercell interference value with other community 40, thereby by adjustment aim SIR, power control nargin K or possible P _maxby its merging.

Embodiment

1, one is used for the method for the through-put power of controlling wireless transmission receiving element (WTRU), and the method comprises:

Based on path loss, open loop up link (UL) power control (PC) component is determined in measurement;

Determine the close-loop power control component that comprises correction factor; And

Open loop component and closed loop component are combined to determine through-put power with power bias.

2, according to the method described in embodiment 1, the method also comprises:

Receive PC corrective command, correction factor based on described corrective command or the corrective command of accumulation.

3,, according to the method described in embodiment 2, wherein said PC corrective command receives within the pre-configured signaling time.

4,, according to the method described in embodiment 3, the wherein said pre-configured signaling time is in specific UL authorizes.

5,, according to the method described in embodiment 4, it is to mix access repetitive requests (HARQ) process that wherein said UL authorizes.

6,, according to the method described in arbitrary embodiment in embodiment 2-5, wherein said open loop PC component is based on path loss variation.

7,, according to the method described in embodiment 6, wherein said path loss variation is the variation between the path loss before discontinuous transmission and the path loss of the time before recovering UL transmission.

8,, according to the method described in arbitrary embodiment in embodiment 2-7, wherein said PC corrective command uses multiple Command field bits of determining based on link-quality.

9,, according to the method described in arbitrary embodiment in embodiment 1-8, wherein said correction factor uses following equation to calculate:

Wherein ESINR _estand SINR _targetrepresent effective Signal to Interference plus Noise Ratio (ESINR) and target SINR.

10,, according to the method described in arbitrary embodiment in embodiment 2-9, the method also comprises the PC corrective command from receiving calculates described corrective command.

11, according to the method described in arbitrary embodiment in embodiment 1-10, the method also comprises:

Described through-put power is applied to the beginning at next uplink transmission time interval (TTI), until next through-put power is upgraded.

12,, according to the method described in arbitrary embodiment in embodiment 1-11, be wherein zero (0) at correction factor described in initial uplink transmission.

13,, according to the method described in arbitrary embodiment in embodiment 1-12, wherein said correction factor is that uplink grant is distributed.

14,, according to the method described in embodiment 13, wherein the correction factor based on authorizing uses following equation to determine:

f(UL?grant?assignment，SINR _T)＝SINR _T-E{SINR _est(UL?grant?assignment)}；

Wherein SINR _estthe SINR that the e Node B that (UL grant assignment) expression WTRU obtains from described UL authorized appropriation receives estimates.

15,, according to the method described in embodiment 14, the method also comprises that the correction factor mark based on receiving determines whether to use the described correction factor based on authorizing.

16,, according to the method described in embodiment 14, the method also comprises that the MCS mismatch designator based on receiving determines whether to use the described correction factor based on authorizing.

17,, according to the method described in embodiment 14, the method also MCS mismatch designator of described processor based on receiving determines whether to use explicit corrective command.

18, according to the method described in arbitrary embodiment in embodiment 1-17, the method also comprises determines interference load designator, and this interference load designator is determined from the strongest neighbor cell.

19, according to the method described in embodiment 18, wherein said through-put power is based on downlink reference signal, and wherein said interference load designator is used for alleviating presence of intercell interference.

20, a kind of wireless transmission receiving element (WTRU), this WTRU comprises the processor that is configured to carry out the method as described in arbitrary embodiment in embodiment 1-19.

21, a Node B, this Node B comprises the processor that is configured to carry out the method as described in arbitrary embodiment in embodiment 1-19.

Although feature of the present invention and element are in a preferred embodiment to be specifically combined in above being described, but each feature or element can use separately other features in described preferred embodiment and element in the case of not having, or with or do not use with in various situations that other features of the present invention and element are combined.Method provided by the invention or flow chart can be at the computer programs of being carried out by all-purpose computer or processor, in software or firmware, implement, wherein said computer program, software or firmware are to be included in computer-readable recording medium in tangible mode, comprise read-only memory (ROM) about the example of computer-readable recording medium, random access memory (RAM), register, buffer storage, semiconductor memory apparatus, the magnetizing mediums of internal hard drive and moveable magnetic disc and so on, the light medium of magnet-optical medium and CD-ROM video disc and digital multi-purpose CD (DVD) and so on.

For instance, appropriate processor comprises: general processor, application specific processor, conventional processors, digital signal processor (DSP), multi-microprocessor, the one or more microprocessors that are associated with DSP core, controller, microcontroller, application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) circuit, any integrated circuit and/or state machine.

The processor relevant to software can be used for realizing radio-frequency (RF) transceiver, to be used in wireless transmission receiving element (WTRU), subscriber equipment (UE), terminal, base station, radio network controller (RNC) or any host computer.WTRU can be combined with the module that adopts hardware and/or form of software to implement, for example camera, camara module, video circuit, speaker-phone, vibratory equipment, loud speaker, microphone, TV transceiver, Earphone with microphone, keyboard, bluetooth module, frequency modulation (FM) radio unit, liquid crystal display (LCD) display unit, Organic Light Emitting Diode (OLED) display unit, digital music player, media player, video game machine module, explorer and/or any WLAN (wireless local area network) (WLAN) module or ultra broadband (UWB) module.

Claims (9)

1. for controlling the method for through-put power of wireless transmission receiving element WTRU, the method comprises:

Based on path loss, open loop up link UL power control PC component is determined in measurement;

Determine and comprise the closed loop PC component of correction factor, wherein this correction factor is the PC corrective command that sends with signal in authorizing based on the UL being associated with mixed automatic repeat request HARQ process;

In the case of the power bias being associated with modulation and encoding scheme MCS with signal transmission, described open loop PC component and described closed loop PC component are combined to determine through-put power with described power bias; And

Apply described through-put power according to the timing of described HARQ process.

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

Receive PC corrective command, the correction factor based on described PC corrective command or the corrective command of accumulating.

3. method according to claim 2 wherein receives described PC corrective command within the pre-configured signaling time.

4. method according to claim 1, wherein said PC corrective command uses multiple Command field bits of determining based on link-quality.

5. a wireless transmission receiving element WTRU, this WTRU comprises:

For based on path loss measurement determine the device of open loop up link UL power control PC component;

For determining the device of closed loop PC component that comprises correction factor, wherein this correction factor is the PC corrective command that sends with signal in authorizing based on the UL being associated with mixed automatic repeat request HARQ process;

For determine the device of WTRU through-put power by described open loop PC component and closed loop PC component are combined with this power bias in the case of the power bias being associated with signal transmission and modulation and encoding scheme MCS; And

For apply the device of described through-put power according to the timing of described HARQ process.

6. WTRU according to claim 5, this WTRU also comprises:

For receiving the device of corrective command of PC corrective command, correction factor based on described PC corrective command or accumulation.

7. WTRU according to claim 6 wherein receives described PC corrective command within the pre-configured signaling time.

8. WTRU according to claim 5, wherein said PC corrective command uses multiple Command field bits of determining based on link-quality.

9. WTRU according to claim 5, this WTRU also comprises:

For determining the device of interference load designator, this interference load designator is determined from the strongest neighbor cell.

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