CN101998596B - Power control method of uplink multiple input multiple output channel - Google Patents

Abstract

The invention provides a method for solving uplink power control aiming at an uplink adopting MIMO transmission mode. The uplink transmitting power depends on the size of transmission block (or modulation coding scheme MCS), path loss, precoding vector type, bandwidth and base station expected receiving power (or signal to noise ratio) and the like. Uplink multi-antenna transmission is utilized, so that the base station obtains certain array gain and user equipment can correspondingly reduce uplink transmitting power; each transmission block of uplink transmission can share the same MCS parameter, the same array gain parameter or the same power adjusting parameter, or each transmission block has respective MCS parameter, array gain parameter and power adjusting parameter; under the conditions that the uplink adopts space multiplexing and CMP precoding vector is utilized, the actual transmitting power of antenna depends on the transmitting power of the layer where the antenna is transmitted; under the conditions that uplink adopts space multiplexing and CMF precoding vector is utilized, the transmitting power of antenna depends on the sum of transmitting powers of each layer where the antenna is transmitted actually, and the base station configures maximum transmitting power of each layer in a semi-static or dynamic way.

Description

The Poewr control method of uplink multiple input multiple output

Technical field

The present invention relates to cell mobile communication systems, more specifically, relate to the method for controlling the uplink transmission power of subscriber equipment in the cellular communication system that adopts multiple-input and multiple-output (MIMO) technology.

Background technology

Along with the development of information technology, mobile terminal is more and more higher to the demand of access rate, and this makes future mobile communication system will have higher transmission rate.The raising of transmission rate can realize by improving system transmission bandwidth or the availability of frequency spectrum.In the uplink transmission mode of WCDMA, TD-SCMDA, the LTE etc. of existing use fixed-bandwidth communication system, mostly the raising of spectrum efficiency is by power control, uses the modes such as high order modulation to realize.In the discussion of the IMT-Advanced technical research such as LTE-Advanced and standard, introduce up multiple-input and multiple-output (MIMO) technology, adopt the technology of space division multiplexing further to improve the spectrum efficiency of up link in up link, thereby further improve uplink transmission rate.

Obviously be different from down link because up link has, up link need to be carried out power control, to ensure that base station maintains in certain level for the quality of reception of subscriber equipment.The introducing of Uplink MIMO technology makes uplink power control mechanism more complicated, makes uplink power control need to consider more factor, as channel status, precoding etc. all can affect the received power of upward signal.The present invention is based on considering of many factors on affecting uplink power control, proposed a kind of comprehensive power control program for uplink multiple input multiple output.

Summary of the invention

The present invention is directed to the method that adopts the up link of MIMO transmission means to propose to solve uplink power control.In up link, for extending battery life, reduce the interference for adjacent cell base station, the uplink transmission power of subscriber equipment need to be controlled at a rational power level.The introducing of Uplink MIMO technology makes uplink power control mechanism more complicated, channel status, precoding etc. make uplink power control need to consider more factor, as all can affected the uplink transmission power of subscriber equipment and the signal received power of base station side.The use of upstream multi-antenna transmitting makes base station obtain certain array gain, makes the user equipment side can corresponding reduction uplink transmission power.

Consider above-mentioned many influencing factors, the present invention proposes a kind of comprehensive power control program for uplink multiple input multiple output.According to the present invention, uplink transmission power depends on size information (or modulation coding mode MCS), path loss, precoding vector type, bandwidth and the base station expectation received power (or signal to noise ratio) of transmission block.

The in the situation that of space division multiplexing, each subscriber equipment can transmit multiple transmission blocks (Transmission Block), each transmission block can be decomposed into one or more layer (layer), and the transmitting power difference of different layers depends on the transmitting power of transmission block separately; Share same array gain, same MCS parameter and same power and adjust parameter for each layer of same transmission block.Each transmission block of uplink can be shared same MCS parameter, same array gain parameter or same power and adjust parameter, or MCS parameter, array gain parameter and power that each transmission block has are separately adjusted parameter.Array gain is that the dynamic parameter that control signal configures is passed through in base station, in time varying channel situation, precoding vector and the instantaneous corresponding specific array gain of channel status, therefore, subscriber equipment obtains up-to-date array gain by down control channel, now, power to adjust parameter be power absolute adjustment quantity or in failure state (subscriber equipment is ignored this parameter); Array gain is obtained and notifies to subscriber equipment after the measurement of uplink reference signals is calculated by base station, and the update cycle of array gain is the integral multiple of uplink reference signals transmission cycle; If adopted the mapping mode of layer displacement in uplink transmission mode, multiple transmission blocks are shared a power adjustment parameter, if do not adopt a mapping mode for layer displacement in uplink transmission mode, the power that each transmission block has is separately adjusted parameter.The in the situation that of space division multiplexing, base station is an array gain of each transmission block configuration by the mode of signaling, if adopt in uplink transmission mode in the situation of transmission block displacement or layer displacement, each transmission block array gain parameter tracking transmission block displacement or layer are shifted and dynamically update, and the displacement of the displacement of transmission block or layer and channel status determine the renewal of array gain jointly; If uplink transmission mode does not adopt the mode of transmission block displacement or layer displacement, each transmission block has array gain parameter separately, and channel condition information is only depended in the renewal of array gain; Base station can be configured or be given tacit consent to array gain by control signal is 0, ignores the impact of array gain for uplink transmission power.

In TDD system, subscriber equipment also can utilize the reciprocity of up-downgoing channel to obtain the estimation of up channel, completes separately thus the calculating of array gain, and now, subscriber equipment need report base station by array gain value.

Adopt spatial reuse and use CMP (Cubic Metric Preserving in uplink, cubic metric keeps) in the situation of precoding vector, the actual emission power of antenna depends on the size of transmitting power of the layer of launching on this antenna, and the array gain value of transmission block and the transmission antenna group of this transmission block, the two channel forming of base station reception antenna are relevant with precoding vector; The maximum transmission power of each layer is the maximum transmission power of antenna.

Adopt spatial reuse and use CMF (Cubic Metric Friendly in uplink, cubic metric close friend) in the situation of precoding vector, if the transmitting power of each layer is identical, the transmitting power of antenna depends on the number of layer and the transmitting power of layer of this antenna actual transmission; If the MCS parameter of each transmission block, array gain parameter and power are adjusted at least one the parameter difference in parameter, different transmission blocks layer transmitting power not identical yet, the transmitting power of antenna depend on this antenna actual transmission the transmitting power of each layer with; Multiple layers of different transmission blocks are launched on same antenna, the maximum transmission power maximum transmission power of each layer and that be not more than this antenna; The maximum transmission power that the semi-static or dynamic-configuration in base station is each layer.

Brief description of the drawings

By below in conjunction with brief description of the drawings the preferred embodiments of the present invention, will make of the present invention above-mentioned and other objects, features and advantages are clearer, wherein:

Fig. 1 is up link MIMO space division multiplexing transmitter schematic diagram;

Fig. 2 is the schematic diagram of layer displacement and transmission block displacement;

Fig. 3 is the layer power division schematic diagram while using CMP precoding vector;

Fig. 4 is the layer power division schematic diagram while using CMF precoding vector; And

Fig. 5 shows the information interaction sequential chart between base station and subscriber equipment.

Embodiment

For clear detailed elaboration performing step of the present invention, provide some specific embodiments of the invention below, be applicable to support mobile communication system, especially the LTE-Advanced cell mobile communication systems of up use MIMO technology.It should be noted that, the invention is not restricted to these application, but applicable to more other relevant communication systems.

To a preferred embodiment of the present invention will be described in detail, in description process, having omitted is unnecessary details and function for the present invention with reference to the accompanying drawings, obscures to prevent that the understanding of the present invention from causing.

The present invention, taking the power control mechanism of existing LTE system as example, illustrates needed power control behavior after up link is introduced MIMO transmission means.In LTE system, the channel of required power control has Uplink Shared Channel (PUSCH), Random Access Channel (PRACH), ascending control channel (PUCCH) and uplink sounding reference signal (Sounding Reference Signal, SRS).Wherein, PUSCH channel is used for the data such as business and high-level signaling of transmission user equipment.

P _PUSCH(i)＝min{P _MAX，10lg(M _PUSCH(i))+P _{O_PUSCH}(j)+α(j)PL+Δ _TF(i)+f(i)}

------(1)

The power control mechanism of LTE is taking power ratio control spectrum density as controlling target, and the power contorl parameters in above-mentioned formula (1) can be with reference to 3GPP36.213 (8.7.0) agreement, and specific explanations is as follows:

P _pUSCHrepresent the transmitting power of subscriber equipment PUSCH channel;

P _mAXrepresent antenna maximum transmission power;

M _pUSCHrepresent the bandwidth of user equipment allocation;

P _{o_PUSCH}represent the parameter relevant to subscriber equipment expectation received power;

α represents path loss compensating proportion;

PL represents path loss consumption;

Δ _tFrepresent the parameter relevant to transmission block size (or modulation coding mode MCS);

F (i) represents power adjustment parameter;

I represents time parameter;

J represents the type parameter of uplink service.

Compared with LTE, LTE-Advanced system has had significant difference in up link, as up link is used multiple sub-frequency spectrums, allows the multiplexing MIMO technology etc. that waits of usage space.

In LTE-Advanced system, adopted spectrum aggregating (Carrier Aggregation) technology, different spectral has different propagation characteristics.Therefore,, in the situation that uplink configuration has multiple sub-frequency spectrum, the difference of different spectral propagation characteristic makes every sub-frequency spectrum need different power contorl parameters.As the M in formula (1) _pUSCH, P _{o_PUSCH}, PL, Δ _tFand the parameter such as f (i), on different sub-frequency spectrums, these parameters are configured by base station, and its value is also not quite similar.But for a certain specific sub-frequency spectrum, its power control is not subject to the impact of other sub-frequency spectrum.The present invention is directed to the power control of a certain specific sub-frequency spectrum in LTE-advanced system.

Fig. 1 is up link MIMO space division multiplexing transmitter schematic diagram.As shown in Figure 1, transmission block-1 and transmission block-2 are mapped to respectively on each layer (layer-1～layer-T) to the mapping of layer by transmission block; Layer-1～layer-T is after precoding/antenna mapping, by corresponding transmission antennas transmit.

Due to the use of Uplink MIMO transmission means, precoding makes the quality of reception of the upward signal of base station side reception be subject to the impact of precoding.Under the transmission means of up space division multiplexing, the CM of uplink signal (Cubic Metric) value depends on the design of precoding vector; In addition the different modulation system that, multiple transmission blocks of up space division multiplexing adopt has material impact to uplink power control equally.Under the transmission means of up space division multiplexing, each transmission block is broken down into multiple layers, all layers use respectively different precoding vectors, the running time-frequency resource that space division multiplexing is identical, and transmission block produces material impact to the mapping mode of layer to the distribution of uplink transmission power.Comprehensive above-mentioned analysis, the principal element that affects uplink power control is:

1. the array gain that precoding produces

The power that is located at the up transmitting of subscriber equipment single antenna is P, and the signal to noise ratio that base station obtains is thus SNR_1, the transmitting of mobile phone upstream multi-antenna, and the transmitting power of each antenna is also P, the received signal to noise ratio that base station obtains is thus SNR_2.Due to the use of multiple transmitting antennas, make the signal to noise ratio of accepting of base station side obtain the array gain (Array Gain) with respect to single-antenna transmission, i.e. SNR_2/SNR_1.In order to reach the received signal to noise ratio identical with single-antenna transmission, in the situation that terminal adopts many antennas, the transmitting power of each antenna can reduce certain transmitting power.

2. transmission block is to the mapping of layer

Transmission block can be decomposed into multiple layers, and under the transmission means of up space division multiplexing, the multiplexing identical running time-frequency resource of different layers, adopts different precodings or antenna to launch.Adopt displacement mode realize transmission block to layer mapping time, same transmission block transmits regularly on different layers, transmission block also can regular rotation.Fig. 2 shows the schematic diagram of above-mentioned layer displacement and transmission block displacement.Transmission block or layer displacement make same transmission block or layer not have in the same time different array gains.

Particularly, as shown in Fig. 2 first half, transmission block 1 and transmission block 2, through serial/parallel (S/P) conversion, are mapped as layer after displacement.Due to displacement in time, same transmission block is at corresponding layer time to time change in the same time not;

As shown in Fig. 2 Lower Half, transmission block 1 and transmission block 2, through transmission block displacement, are mapped as layer after serial/parallel (S/P) conversion.Due to displacement in time, same transmission block is at corresponding layer time to time change in the same time not;

3. the design of precoding vector

Through after precoding, the power of each power amplifier actual transmissions is the stacks of the multiple layers of power distributing on each power amplifier.Therefore, in fact power division power control be in other words exactly to meet under the prerequisite of each power amplifier constraint, controls the power of distributing to each transmission block or layer.Each layer is at corresponding one group of antenna after precoding, and these antenna has formed the transmit antenna set of this one deck.The in the situation that of space division multiplexing, if the transmit antenna set of each layer mutually orthogonal (being each other without occuring simultaneously between antenna set), the corresponding precoding vector of this type of precoding is CMP (Cubic Metric Preserving) precoding vector; If exist and occur simultaneously between the set of part transmit antenna, the corresponding precoding vector of this type of precoding is CMF (Cubic Metric Friendly) precoding vector.

Fig. 3 is the layer power division schematic diagram while using CMP precoding vector.

As shown in Figure 3, the precoding vector of CMP type make layer 1 antenna set for 1,2}, and the antenna set of layer 2 be 3,4}, two antenna set are mutually orthogonal, each transmitting antenna only carries a layer.

Fig. 4 is the layer power division schematic diagram while using CMF precoding vector.

As shown in Figure 4, there is the antenna set of different layers to occur simultaneously in the precoding of CMF type, i.e. layer 1 antenna set be 2,3}, the antenna set of layer 2 is { Isosorbide-5-Nitrae }, layers 3 antenna set is { 1,2,3,4}.All antennas have all carried multiple layers, and the CM (Cubic Metric) (or peak-to-average force ratio PAR) of each antenna transmission signal is increased.Under extreme case, each antenna can carry all layers.

4. the modulation system of transmission block

Under the transmission means of space division multiplexing, the different transmission blocks that participate in space division multiplexing can use identical modulation system or different modulation systems.

5. channel status, as order (Rank) etc.

Under the transmission means of space division multiplexing, the different layers that belongs to same transmission block is assigned identical transmitting power.If exist multiple layers of same transmission block to transmit on the same antenna, the transmitting power of this antenna is relevant with the number of layer, and the number of layer depends on the type of the sum of ranks precoding vector of channel.Therefore, channel condition information (as order etc.) is also the key factor that affects uplink transmission power.

Respectively with regard to the various combination of above-mentioned various factors, describe the uplink power control mechanism of LTE-A system in detail below.

the transmitting power of layer

$\begin{array}{c}{P}_{\mathrm{PUSCH}\_\mathrm{layer}\_b\_l_b}\left(i\right)\\ =\min \{{\mathrm{\β}}_b+P_{{\mathrm{MAX}}_b,10\lg \left(M_{\mathrm{PUSCH}}\left(i\right)\right)+P_{O\_\mathrm{PUSCH}}\left(j\right)}\\ +\mathrm{\α}\left(j\right)\mathrm{PL}+{\mathrm{\Δ}}_{\mathrm{TF}\_b}\left(i\right)-{\mathrm{Gain}}_b+f_b\left(i\right)\}\left(\mathrm{dB}\right)\end{array}------\left(2\right)$

Wherein, b=1,2...B, l _b=1,2 ... L _b, the sum that B is uplink transmission block, L _bfor transmission block b be mapped to layer sum.β _bfor power partition coefficient.Gain _bthe array gain relevant to transmission block b. it is the minimum value in the power amplifier maximum transmission power of all antennas of transmitting transmission block b.

by the transmitting power of antenna

RANK＝1

The number B=1 of uplink transmission block, L _b=1

$P_{\mathrm{PUSCH}\_\mathrm{antenna}\_k}\left(i\right)=P_{\mathrm{PUSCH}\_\mathrm{layer}\_b\_l_b}------\left(3\right)$

Wherein, and k ∈ [1,2 ... m], m represents the antenna number of subscriber equipment, β _b=0.

If it is s that it line options makes the number of transmitting antenna, m > s>=2, by the subchannel H selecting _{n × s}computing array gain G ain _b, be;

If it line options makes the number s=1 of transmitting antenna, Gain _b=0.

RANK＞1

The number B > 1 of uplink transmission block, L _b>=1

cMP precoding

$P_{\mathrm{PUSCH}\_\mathrm{antenna}\_k}\left(i\right)=P_{\mathrm{PUSCH}\_\mathrm{layer}\_b\_l_b}------\left(4\right)$

Wherein, and k ∈ [1,2 ... m], l _b=1,2 ..., L _b; β _b=0;

k∈antenna_set_b_l _b， $\mathrm{antenna}\_\mathrm{set}\_b\_l_b\⋐[\mathrm{1,2},...m],$

Antenna_set_b_l _bfor transmission block b shine upon layer l _btransmitting antenna set, k is antenna label; The antenna set of different layers is mutually orthogonal.

cMF precoding;

If the MCS of each transmission block is identical, i.e. Δ _{tF_b}(i) identical, think the array gain Gain of different transmission blocks _balso identical, thus the transmitting power of each antenna is only relevant with the power of layer with the number of layer of each antenna actual transmission.

$P_{\mathrm{PUSCH}\_\mathrm{antenna}\_k}\left(i\right)={\mathrm{\Δ}}_{\mathrm{RI}\_k}+P_{\mathrm{PUSCH}\_\mathrm{layer}\_b\_l_b}------\left(5\right)$

Δ _{rI_k}for the parameter relevant to the number of layers of antenna k actual transmission; All layer transmitting powers all equate.

If the Δ of each transmission block _{tF_b}(i), Gain _b, and f _b(i) at least one difference in three parameters,

P _{PUSCH_antenna_k}(i)＝Δ _k

------(6)

Wherein, β _b≠ 0, and

${\mathrm{\Δ}}_k=10\lg \left(\underset{(b,l)}{\overset{\mathrm{layer}\_\mathrm{set}\_k}{\mathrm{\Σ}}}{10}^{\left(P_{\mathrm{PUSCH}\_\mathrm{layer}\_b\_l_b}\right)/10}\right)------\left(7\right)$

Set (b, l _b) represent the layer l that transmission block b shines upon _b, (b, l _b) ∈ layer_set_k, wherein, layer_set_k represents the set of all layers of the upper transmitting of antenna k.

power control law

[1] the transmitting power difference of different layers depends on the size of transmission block (or modulation coding mode) Δ separately _{tF_b}, array gain Gain _band and power adjustment parameter f _b(i); Share same array gain Gain for each layer of same transmission block b _b, same MCS parameter Δ _{tF_b}adjust parameter f with same power _b(i), use identical transmitting power $P_{\mathrm{PUSCH}\_\mathrm{layer}\_b\_l_b},l_b=\mathrm{1,2},...L_b;$

[2] subscriber equipment obtains size (or modulation coding mode) Δ of each transmission block by control channel _{tF_b}, array gain Gain _band and power adjustment parameter f _b(i); Each transmission block can be shared same MCS parameter Δ _{tF_b}, array gain parameter Gain _band and power adjustment parameter f _b(i), or each transmission block there is MCS parameter Δ separately _{tF_b}, array gain parameter Gain _band and power adjustment parameter f _b(i);

[3] array gain Gain _bbe that the dynamic parameter that control signal configures is passed through in base station, in time varying channel situation, precoding vector and instantaneous channel status are corresponding to specific array gain, and therefore, subscriber equipment obtains up-to-date array gain by down control channel, f now _b(i) for the absolute magnitude of power adjustment or in failure state (subscriber equipment is ignored this parameter);

[4] array gain Gain _bobtained and notify to subscriber equipment after the measurement of uplink reference signals is calculated by base station, the update cycle of array gain is the integral multiple of uplink reference signals transmission cycle;

[5] if adopted the mapping mode of layer displacement in uplink transmission mode, about f _b(i) command mode adopts scheme 1 or scheme 3 (describing after a while), and multiple transmission blocks are shared a power contorl parameters f _b(i), if do not adopt the mapping mode of layer displacement in uplink transmission mode, about f _b(i) command mode adopts scheme 2 (describing after a while), and each transmission block has power contorl parameters f separately _b(i).

[6] base station can be Gain by signal deployment or acquiescence array gain _b=0, ignore the impact of array gain for uplink transmission power;

[7], in the situation of space division multiplexing, base station is an array gain Gain of each transmission block configuration by the mode of signaling _bif adopt in uplink transmission mode in the situation of transmission block displacement or layer displacement, each transmission block array gain parameter tracking transmission block displacement or layer are shifted and dynamically update, and the displacement of the displacement of transmission block or layer and channel status determine the renewal of array gain jointly; If uplink transmission mode does not adopt the mode of transmission block displacement or layer displacement, each transmission block has array gain parameter separately, and channel condition information is only depended in the renewal of array gain;

[8] in TDD system, subscriber equipment also can utilize the reciprocity of up-downgoing channel to obtain the estimation of up channel, completes separately thus the calculating of array gain, and now, subscriber equipment need report base station by array gain value;

RANK > 1, CMP precoding

[9] the actual emission power P of antenna _{pUSCH_antenna_k}depend on the transmitting power of the layer of launching at this antenna

size;

[10] the array gain Gain of transmission block b _bvalue is relevant with precoding vector to transmitting antenna, the two channel forming of base station reception antenna of transmission block b;

[11] power partition coefficient β _b=0, the maximum transmission power that maximum transmission power of each layer is antenna.

RANK > 1, CMF precoding

[9 '] is if the transmitting power of each layer

identical, the transmitting power of antenna depends on number and the layer transmitting power of the layer of this antenna actual transmission

Δ _{rI_k}it is the relevant parameter of number to the layer of antenna k actual transmission; If the MCS parameter Δ of each transmission block _{tF_b}, array gain parameter Gain _band power is adjusted parameter f _b(i) three's at least one parameter difference in one of them at least, the transmitting power of the layer of different transmission blocks is not identical yet, the transmitting power P of antenna _{pUSCH_antenna_k}depend on this antenna actual transmission each layer of transmitting power and Δ _k;

Multiple layer (b, the l of [10 '] same transmission block b _b), l _b∈ [1,2 ... L _b] on same antenna, launch p _bfor transmission block b on this antenna shine upon layer number; If the multiple layer of different transmission blocks on same antenna, launch, at the β of the transmission block of this antenna transmission _bmeet

$\underset{b=1}{\overset{B}{\mathrm{\Σ}}}{10}^{({\mathrm{\β}}_b+10\lg p_b)/10}\≤1$

It is maximum transmission power maximum transmission power and that be not more than this antenna of each layer;

Semi-static or the dynamic-configuration power division parameter beta in [11 '] base station _b, i.e. the maximum transmission power of each layer of the semi-static or dynamic-configuration in base station.

the calculating of array gain

Setting subscriber equipment is H to the channel of base station _{n × m}=[h ₁... h _m], wherein m represents the number of subscriber equipment end antenna, n represents the number of base station side antenna; If the order of current channel is that (now number of layers is r) to r, and corresponding precoding vector is w=[w ₁... w _r], wherein || w _i|| ₂=1, i=1,2 ... r.If r=1, precoding vector is w=w ₁.

Matrix gain be one about channel condition information H (or the precoding vector that comprises equivalent layer function w),

Gain=F (H, w) or Gain=F (H)

------(8)

Its concrete account form can have:

Mode-1:

Gain＝10lg((Hw) ^HHw)＝10lg(w ^HRw)(dB)

------(9)

Wherein, R=H ^hh, or R=F (H ^hh), F (*) is a statistical function, as calculated the function of time domain or frequency domain mean value, calculates moving average value function, i.e. MA (moving average) model etc.

Mode-2:

R is done to singular value decomposition (Singular Value Decomposition),

[U，Λ，V]＝SVD(R)

------(10)

Wherein, R=H ^hh, or R=F (H ^hh), F (*) f is a statistical function, identical with the definition in mode-1.Λ is singular value matrix, and λ is its maximum singular value.?

Gain＝10lg(λ)(dB)

------(11)

Mode-3:

$\mathrm{Gain}=10\lg \frac{{\mathrm{mw}}^H{H}^H\mathrm{Hw}}{\mathrm{trace}\left(H^{H}H\right)}\left(\mathrm{dB}\right)------\left(12\right)$

For above-mentioned three kinds of modes, in TDD system and FDD system, the calculating of array gain all can be completed by base station; In TDD system, subscriber equipment also can utilize the reciprocity of up-downgoing channel to obtain the estimation of up channel, completes separately thus the calculating of array gain, and now, subscriber equipment need report base station by array gain value.

power control command word TPC scheme ([5] in power control law)

Subscriber equipment obtains power by down control channel and adjusts parameter f _b(i).The in the situation that of space division multiplexing, the multiple transmission blocks that participate in space division multiplexing can use same power to adjust parameter, or use power separately to adjust parameter, concrete scheme 1,2 or 3, here the number of setting the transmission block of space division multiplexing is 2, represents respectively with CW-1 and CW-2.TPC has represented the value of actual power adjustment parameter.

The step value of power adjustment is the numerical value of base station and the common acquiescence of subscriber equipment, or notice is set to subscriber equipment by base station.The present invention only considers power adjustment direction, i.e. increased power or the minimizing of transmission block.↑ representing to improve transmitting power, ↓ expression reduces transmitting power ,-represent that transmitting power does not adjust;

Scheme 1

TPC	0	1
			CW-1	↑	↓
CW-2	↑	↓

In scheme 1, subscriber equipment basis receives control bit information and existing step parameter is determined power adjustment.If TPC is 0, the transmitting power of two transmission blocks all increases; If TPC is 1, the transmitting power of two transmission blocks all reduces.

Scheme 2

TPC-1	0	1
			CW-1	↑	↓
TPC-2	0	1
			CW-2	↑	↓

In scheme 2, subscriber equipment basis receives control bit information and existing step parameter is determined power adjustment.Transmission block CW-1 and CW-2 have separately independently power and adjust parameter TPC-1 and TPC-2.

Scheme 3

TPC	0	1	2	3	4
						CW-1	↑	↓	-	↓	↓
CW-2	↑	↑	↑	-	↓

In scheme 3, subscriber equipment basis receives control bit information and existing step parameter is determined power adjustment.If TPC is 0, the transmitting power of two transmission blocks all increases; If TPC is 1, the transmitting power of transmission block CW-1 reduces, and the transmitting power of transmission block CW-2 improves; If TPC is 2, the transmitting power of transmission block CW-1 remains unchanged, and the transmitting power of transmission block CW-2 improves.

Fig. 5 shows the information interaction sequential chart between base station and subscriber equipment.

As shown in Figure 5, first base station obtains β _b, M _{pUSCH (}i), P _{o_PUSCH}(j), α (j), Δ _{tF_b}(i), f _b(i), then, by obtained β _b, M _pUSCH(i), P _{o_PUSCH}(j), α (j), Δ _{tF_b}(i), f _b(i) notice is to subscriber equipment.Subscriber equipment obtains and PL, and according to formula (2), determine the transmitting power of each layer.About

subscriber equipment can be by the ability P of self in the time of access network _mAXinform to base station, and dispatched by base station, determine the mapping relations between each layer and antenna, and finally determine

and then notice is to subscriber equipment; Or, for the situation of the number s=1 of transmitting antenna,

be exactly the maximum transmission power P of the power amplifier of selected antenna _mAX, subscriber equipment can directly obtain, and needn't be informed by base station.About the Gain in formula (2) _bcan calculate and obtain to the channel matrix of base station according to subscriber equipment by base station, and notice is to subscriber equipment (TDD and FDD system), also can calculate to the channel matrix antithesis of subscriber equipment obtain (TDD system) according to base station by subscriber equipment self.

Afterwards, subscriber equipment, according to formula (3)～(7), is determined the transmitting power of each transmitting antenna, and with the transmitting power of determined each transmitting antenna, performing data transmission in uplink transport channel.

In above description, for each step, enumerate Multi-instance, although inventor indicates example associated with each other as much as possible, this does not also mean that these examples must exist corresponding relation according to corresponding label.Need only between the condition that selected example is given and do not have contradiction, can be in different steps, select the not corresponding example of label to form corresponding technical scheme, such technical scheme also should be considered as within the scope of the invention involved.

So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that, those skilled in the art without departing from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.

Claims (10)

1. a Poewr control method for uplink multiple input multiple output, comprising:

For each transmission block,

Base station obtains with next group parameter: the power partition coefficient relevant with described transmission block, power adjust parameter, precoding vector, bandwidth, expectation received power or expect signal to noise ratio, with the size of transmission block or the relevant parameter of modulation coding mode, and above-mentioned parameter group is notified to subscriber equipment; And

Subscriber equipment obtains with next group parameter: path loss, launch the minimum value in the power amplifier maximum transmission power of all antennas of described transmission block, and the parameter group sending over according to base station, the subscriber equipment parameter group and the array gain that obtain, determine the transmitting power of each layer that described transmission block shines upon;

For all transmission blocks,

Subscriber equipment basis is mapped to the transmitting power of each layer of each transmit antennas, determines the transmitting power of each transmit antennas; And

Subscriber equipment is with the transmitting power of determined each transmit antennas, performing data transmission in uplink transport channel.

2. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

In the situation that uplink transmission mode adopts space division multiplexing,

The multiple transmission blocks of each user device transmissions, each transmission block be decomposed one or more layer, the transmitting power of each layer depends on the transmitting power of transmission block separately; And

Share same array gain, same modulation coding mode and same power and adjust parameter for each layer of same transmission block.

3. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

Array gain is

By base station by obtaining after the measurement of uplink reference signals is calculated and notifying to subscriber equipment; Or

Calculate and obtain and notify to subscriber equipment according to channel condition information and precoding vector by base station; Or

The dynamic parameter that base station configures by control signal, subscriber equipment obtains up-to-date array gain by down control channel, and in the case, it is an absolute magnitude that power is adjusted parameter, or is ignored by subscriber equipment, and

The update cycle of array gain is the integral multiple of uplink reference signals transmission cycle.

4. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

Array gain configures or is defaulted as 0 by base station by control signal.

5. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

The in the situation that of space division multiplexing, base station is an array gain of each transmission block configuration by control signal,

If uplink transmission mode adopts transmission block displacement mapping or layer displacement mapping, each transmission block array gain parameter tracking transmission block displacement mapping or layer displacement are shone upon and dynamically update, and the renewal that jointly determines array gain with channel status is shone upon in transmission block displacement mapping or layer displacement;

If uplink transmission mode does not adopt transmission block displacement mapping or layer displacement mapping, each transmission block has array gain parameter separately, and channel condition information is only depended in the renewal of array gain.

6. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

The in the situation that of time division duplex, subscriber equipment utilizes the reciprocity of up-downgoing channel, obtains the estimation of up channel, completes separately thus the calculating of array gain, and array gain value is reported base station by subscriber equipment.

7. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

The maximum transmission power of layer depend on maximum transmission power, the precoding vector of antenna type, participate in the power division ratio of the transmission block of space division multiplexing;

In the situation that using cubic metric to keep CMP precoding vector, the maximum transmission power of layer is the maximum transmission power of the described layer of antenna shining upon;

In the situation that using the friendly CMF precoding vector of cubic metric, multiple layers are launched on same antenna, the maximum transmission power of each layer and be not more than the maximum transmission power of described antenna, wherein the maximum transmission power of each layer by base station semi-static or dynamic-configuration.

8. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

If uplink transmission mode adopts layer displacement mapping, the shared power of multiple transmission blocks is adjusted parameter,

If uplink transmission mode does not adopt layer displacement mapping, the power that each transmission block has is separately adjusted parameter.

9. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

In the situation that uplink transmission mode adopts spatial reuse and use cubic metric to keep CMP precoding vector, the actual emission power of antenna depends on the size of transmitting power of the layer of launching on this antenna, and the array gain value of transmission block and the transmission antenna group of this transmission block, the two channel forming of base station reception antenna are relevant with precoding vector.

10. the Poewr control method of uplink multiple input multiple output according to claim 1, is characterized in that:

In the situation that uplink transmission mode adopts spatial reuse and use the friendly CMF precoding vector of cubic metric, if the transmitting power of each layer is identical, the transmitting power of antenna depends on the number of layer and the transmitting power of layer of this antenna actual transmission; If at least one parameter in the modulation coding mode of each transmission block, array gain and power adjustment parameter is different, different transmission blocks layer transmitting power not identical yet, the transmitting power of antenna depend on this antenna actual transmission each layer transmitting power with.

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