CN101998596A - 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 up multi-input multi-ouput channel

Technical field

The present invention relates to cell mobile communication systems, more specifically, relate to the method for the uplink transmission power of control 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, portable 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 the system transmission bandwidth or the availability of frequency spectrum.In the uplink mode of communication systems such as the WCDMA, the TD-SCMDA that have the use fixed-bandwidth now, LTE, mostly the raising of spectrum efficiency is that by power control, modes such as use high order modulation realize.In the discussion of IMT-Advanced technical research such as LTE-Advanced and standard, introduced up multiple-input and multiple-output (MIMO) technology, promptly adopt the technology of space division multiplexing further to improve the spectrum efficiency of up link, thereby further improve uplink speed in up link.

Because up link has and obviously is different from down link, promptly up link need be carried out power control, maintains on certain level for the quality of reception of subscriber equipment to guarantee the base station.The introducing of Uplink MIMO technology makes that uplink power control mechanism is more complicated, makes uplink power control need consider more factors, all can influence the received power of upward signal as channel status, precoding etc.The present invention is based on the taking all factors into consideration of the multiple factor that influences uplink power control, proposed a kind of comprehensive power controlling schemes at up multi-input multi-ouput channel.

Summary of the invention

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

Consider above-mentioned many influencing factors, the present invention proposes a kind of comprehensive power controlling schemes at up multi-input multi-ouput channel.According to the present invention, uplink transmission power depends on size information (perhaps modulation coding mode MCS), path loss, precoding vector type, bandwidth and the base station expectation received power (perhaps signal to noise ratio) of transmission block.

Under the situation of space division multiplexing, each subscriber equipment can transmit a plurality of 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; Each of same transmission block layer shared same array gain, same MCS parameter and same power are adjusted parameter.Each transmission block of uplink can be shared same MCS parameter, same array gain parameter or same power and adjust parameter, and perhaps each transmission block has separately MCS parameter, array gain parameter and power adjustment parameter.Array gain is that the base station is by controlling the dynamic parameter that signaling disposes, under the 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, at this moment, power adjustment parameter is the absolute adjustment quantity of power or is in failure state (subscriber equipment is ignored this parameter); Array gain obtains and is notified to subscriber equipment by the base station after the measurement of uplink reference signals is calculated, 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 the uplink mode, the shared power of then a plurality of transmission blocks is adjusted parameter, if do not adopt the mapping mode of layer displacement in the uplink mode, then each transmission block has power adjustment parameter separately.Under the situation of space division multiplexing, the base station is array gain of each transmission block configuration by means of signaling, if adopt in the uplink mode under 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, the displacement of the displacement of transmission block or layer and the renewal that channel status determines array gain jointly; If the uplink mode does not adopt the mode of transmission block displacement or layer displacement, then each transmission block has array gain parameter separately, and channel condition information is only depended in the renewal of array gain; The base station can be 0 by configuration of control signaling or acquiescence array gain, promptly ignores the influence 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, finishes the calculating of array gain thus separately, and at this moment, subscriber equipment needs the array gain value is reported the base station.

Adopt in uplink under the situation of spatial reuse and use CMP (Cubic Metric Preserving) precoding vector, the actual emission power of antenna depends on the size of transmitting power of the layer of launching on this antenna, the array gain value of transmission block and the transmission antenna group of this transmission block, the two channel that is constituted 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 under the situation of CMF (Cubic Metric Friendly) precoding vector in uplink, if the transmitting power of each layer is identical, then the transmitting power of antenna depends on the number of layer of this antenna actual transmission and the transmitting power of layer; If the MCS parameter of each transmission block, array gain parameter and power are adjusted at least one the parameter difference in the parameter, then different transmission blocks the layer transmitting power also inequality, the transmitting power of antenna depend on this antenna actual transmission each layer transmitting power and; A plurality of 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 of semi-static or each layer of dynamic-configuration in base station.

Description of drawings

By below in conjunction with description of drawings the preferred embodiments of the present invention, will make above-mentioned and other purpose of the present invention, feature and advantage clearer, wherein:

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

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

Layer power division schematic diagram when Fig. 3 is to use the CMP precoding vector;

Layer power division schematic diagram when Fig. 4 is to use the CMF precoding vector; And

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

Embodiment

For clear detailed elaboration performing step of the present invention, provided some specific embodiments of the invention below, be applicable to mobile communication system, especially the LTE-Advanced cell mobile communication systems of supporting up use MIMO technology.Need to prove, the invention is not restricted to these and use, but applicable to more other relevant communication systems.

To a preferred embodiment of the present invention will be described in detail, having omitted in the description process 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 is an example with the power control mechanism of prior LTE system, and desired power control behavior after up link is introduced the MIMO transmission means is described.In the LTE system, the channel of required power control have Uplink Shared Channel (PUSCH), Random Access Channel (PRACH), ascending control channel (PUCCH) and up interception reference signal (Sounding Reference Signal, SRS).Wherein, the PUSCH channel is used for data such as the business of transmission user equipment and high-level signaling.

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 a controlled target with the power controlling spectrum density, and the power contorl parameters in the above-mentioned formula (1) can be with reference to 3GPP 36.213 (8.7.0) agreement, and specific explanations is as follows:

P _PUSCHExpression subscriber equipment PUSCH channel transmitting power;

P _MAXExpression antenna maximum transmission power;

M _PUSCHThe bandwidth of expression user equipment allocation;

P _{O_PUSCH}Represent the parameter relevant with the subscriber equipment expectation received power;

α represents the path loss compensating proportion;

PL represents path loss consumption;

Δ _TFExpression and the relevant parameter of transmission block size (perhaps modulation coding mode MCS);

F (i) expression power is adjusted parameter;

I express time parameter;

J represents the type parameter of uplink service.

Compare with LTE, there has been significant difference in the LTE-Advanced system in up link, uses a plurality of sub-frequency spectrums as up link, allows the multiplexing MIMO technology etc. that waits of usage space.

Adopted spectrum aggregating (Carrier Aggregation) technology in the LTE-Advanced system, different spectral has different propagation characteristics.Therefore, have in uplink configuration under the situation of a plurality of sub-frequency spectrums, the difference of different spectral propagation characteristic makes each sub-frequency spectrum need different power contorl parameters.As the M in the formula (1) _PISCH, P _{O_PUSCH}, PL, Δ _TFAnd f parameters such as (i), on different sub-frequency spectrums, these parameters are disposed by the base station, and its value also is not quite similar.But for a certain specific sub-frequency spectrum, its power control is not subjected to the influence of other sub-frequency spectrum.The present invention is directed to the power control of a certain specific sub-frequency spectrum in the LTE-advanced system.

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

Because the use of Uplink MIMO transmission means, precoding make the quality of reception of the upward signal that base station side receives be subjected to the influence 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 a plurality of transmission block adopted of up space division multiplexing has material impact to uplink power control equally.Under the transmission means of up space division multiplexing, each transmission block is broken down into a plurality of layers, all layers use different precoding vectors respectively, and the running time-frequency resource that space division multiplexing is identical, transmission block arrive the distribution generation material impact of the mapping mode of layer to uplink transmission power.Comprehensive above-mentioned analysis, the principal element that influences uplink power control is:

1. the array gain that precoding produced

Being located at the up emitted power of subscriber equipment single antenna is P, and the signal to noise ratio that the base station obtains thus is SNR_1, the emission of mobile phone upstream multi-antenna, and the transmitting power of each antenna also is P, the received signal to noise ratio that the base station obtains thus is SNR_2.Because the use of a plurality of transmitting antennas, make the signal to noise ratio of accepting of base station side obtain 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, adopt in terminal under the situation of 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 a plurality of 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.When adopting the mode of displacement to realize that transmission block arrives the mapping of layer, same transmission block transmits on different layers regularly, and transmission block is rotation clocklike also.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 have different array gains constantly in difference.

Particularly, shown in Fig. 2 first half, transmission block 1 and transmission block 2 are mapped as layer through serial/parallel (S/P) conversion after the displacement.Because displacement in time, same transmission block is at the corresponding constantly layer time to time change of difference;

Shown in Fig. 2 Lower Half, transmission block 1 and transmission block 2 are mapped as layer through the transmission block displacement after serial/parallel (S/P) conversion.Because displacement in time, same transmission block is at the corresponding constantly layer time to time change of difference;

3. the design of precoding vector

Through after the precoding, the power of each power amplifier actual transmissions is the stack of power on each power amplifier that a plurality of layers are distributed.Therefore, in fact power division power control in other words be exactly that Control Allocation is given the power of each transmission block or layer under the prerequisite that satisfies each power amplifier constraint.Each layer is corresponding one group of antenna after the process precoding, and these antenna has constituted the transmit antenna set of this one deck.Under the situation of space division multiplexing, if the transmit antenna of each layer set mutually orthogonal (being not have common factor each other between the antenna set), then the pairing precoding vector of this type of precoding is CMP (Cubic Metric Preserving) precoding vector; Occur simultaneously if exist between the set of part transmit antenna, then the pairing precoding vector of this type of precoding is CMF (Cubic Metric Friendly) precoding vector.

Layer power division schematic diagram when Fig. 3 is to use the CMP precoding vector.

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

Layer power division schematic diagram when Fig. 4 is to use the CMF precoding vector.

As shown in Figure 4, the precoding of CMF type makes the antenna set of different layers exist to occur simultaneously, i.e. the antenna of layer 1 set for 2,3}, the antenna set of layer 2 for 1,4}, the antenna set of layer 3 for 1,2,3,4}.All antennas have all carried a plurality of layers, and the CM (Cubic Metric) (perhaps peak-to-average force ratio PAR) that makes each antenna transmit increases.Under the 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 is 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 a plurality of layers of same transmission block to transmit on the same antenna, then 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.) also is the key factor that influences 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

$P_{\mathrm{PUSCH}\_\mathrm{layer}\_b\_l_b}\left(i\right)$

$=\min \{{\mathrm{\β}}_b+P_{{\mathrm{MAX}}_b},101g\left(M_{\mathrm{PUSCH}}\left(i\right)\right)+P_{O\_\mathrm{PUSCH}}\left(j\right)$

$+\mathrm{\α}\left(j\right)\mathrm{PL}+{\mathrm{\Δ}}_{\mathrm{TF}\_b}\left(i\right)-{\mathrm{Gain}}_b+f_b\left(i\right)\}\left(\mathrm{dB}\right)$

------(2)

Wherein, b=1,2...B, l _b=1,2 ... L _b, B is the sum of uplink transmission block, L _bBe mapped to the sum of layer for transmission block b.β _bFor power partition coefficient.Gain _bBe the array gain relevant with transmission block b.

It is the minimum value in the power amplifier maximum transmission power of all antennas of emission transmission block b.

Transmitting power by 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 a day line options makes that the number of transmitting antenna is s, m＞s 〉=2 are then by the subchannel H that selects _{N * s}Computing array gain G ain _b, be;

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

RANK＞1

Number B＞1 of uplink transmission block, L _b〉=1

The 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 _bβ _b=0;

k∈antenna_set_b_l _b，

Antenna_set_b_l _bFor transmission block b shone upon the layer l _bTransmitting antenna set, k is the antenna label; The antenna set of different layers is mutually orthogonal.

The CMF precoding;

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

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

Δ _{RI_k}For with the relevant parameter of number of layers of antenna k actual transmission; All layers transmitting power

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, then

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) the layer l that shone upon of expression transmission block b _b, then (b, l _b) ∈ layer_set_k, wherein, layer_set_k represents that antenna k goes up the set of all layers of emission.

The power control law

[1] the transmitting power difference of different layers depends on the size of transmission block (perhaps modulation coding mode) Δ separately _{TF_b}, array gain Gain _bAnd and power adjustment parameter f _b(i); Each layer of same transmission block b shared same array gain Gain _b, same MCS parameter Δ _{TF_b}Adjust parameter f with same power _b(i), promptly use identical transmitting power

l _b=1,2 ... L _b

[2] subscriber equipment obtains size (perhaps 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), perhaps each transmission block has separately MCS parameter Δ _{TF_b}, array gain parameter Gain _bAnd and power adjustment parameter f _b(i);

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

[4] display gain G ain _bObtain and be notified to subscriber equipment by the base station after the measurement of uplink reference signals is calculated, 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 the uplink mode, then about f _b(i) command mode adopts scheme 1 or scheme 3 (describing after a while), and promptly a plurality of transmission blocks are shared a power contorl parameters f _b(i), if do not adopt the mapping mode of layer displacement in the uplink mode, then about f _b(i) command mode adopts scheme 2 (describing after a while), and promptly each transmission block has power contorl parameters f separately _b(i).

[6] base station can be Gain by signaling configuration or acquiescence array gain _b=0, promptly ignore the influence of array gain for uplink transmission power;

[7] under the situation of space division multiplexing, the base station is array gain Gain of each transmission block configuration by means of signaling _bIf adopt in the uplink mode under 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, the displacement of the displacement of transmission block or layer and the renewal that channel status determines array gain jointly; If the uplink mode does not adopt the mode of transmission block displacement or layer displacement, then 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, finishes the calculating of array gain thus separately, and at this moment, subscriber equipment needs the array gain value is reported the base station;

RANK＞1, the CMP precoding

[9] the actual emission power P of antenna _{PUSCH_antenna_k}The transmitting power that depends on the layer of launching at this antenna

Size;

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

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

RANK＞1, the CMF precoding

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

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

Δ _RIkBe with antenna k actual transmission the layer the relevant parameter of number; 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, then the transmitting power of the layer of different transmission blocks is also inequality, the transmitting power P of antenna _{PUSCH_antenna_k}Depend on this antenna actual transmission each layer transmitting power and Δ _k

A plurality of 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 shone upon the layer number; If a plurality of layer of different transmission blocks is launched on same antenna, then at the β of the transmission block of this antenna emission _bSatisfy

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

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 semi-static or each layer of dynamic-configuration in base station.

The calculating of array gain

The 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 r (promptly this moment, number of layers was r), then corresponding precoding vector is w=[w ₁... w _r], wherein || w _i|| 2=1, i=1,2 ... r.If r=1, then precoding vector is w=w ₁

The matrix gain is a function about channel condition information H (the precoding vector w that perhaps comprises equivalent layer),

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

Mode-2:

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

[U，Λ，V]＝SVD(R)

------(10)

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

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 finished by the base station; In TDD system, subscriber equipment also can utilize the reciprocity of up-downgoing channel to obtain the estimation of up channel, finishes the calculating of array gain thus separately, and at this moment, subscriber equipment needs the array gain value is reported the base station.

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

Subscriber equipment obtains power by down control channel and adjusts parameter f _b(i).Under the situation of space division multiplexing, the a plurality of transmission blocks that participate in space division multiplexing can use same power to adjust parameter, perhaps 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 with CW-1 and CW-2 respectively.On behalf of actual power, TPC adjust the value of parameter.

The step value of power adjustment is the numerical value of base station and the common acquiescence of subscriber equipment, perhaps is provided with by the base station and is notified to subscriber equipment.The present invention only considers the power adjustment direction of transmission block, and promptly power increases or reduces.↑ expression improves transmitting power, and ↓ expression reduces transmitting power, and-expression transmitting power does not adjust;

Scheme 1

TPC	0	1
			CW-1	↑	↓
CW-2	↑	↓

In scheme 1, the subscriber equipment basis receives control bit information and existing step parameter is determined power adjustment.As TPC is 0, and then the transmitting power of two transmission blocks all increases; As TPC is 1, and then 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, the 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 adjustment parameter TPC-1 and TPC-2.

Scheme 3

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

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

As shown in Figure 5, the base station at first obtains β _b, M _PUSCH(i), P _{O_PUSCH}(j), α (j), Δ _{TF_b}(i), f _b(i), then, with the β that is obtained _b, M _PUSCH(i), P _{O_PUSCH}(j), α (j), Δ _{TF_b}(i), f _b(i) be notified to subscriber equipment.Subscriber equipment obtains

And PL, and, determine the transmitting power of each layer according to formula (2).About Subscriber equipment can be when access network with the ability P of self _MAXInform to the base station, and dispatch, determine the mapping relations between each layer and antenna by the base station, and final definite And then be notified to subscriber equipment; Perhaps, 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 the base station.About the Gain in the formula (2) _b, can calculate to the channel matrix of base station according to subscriber equipment by the base station and obtain, and be notified to subscriber equipment (TDD and FDD system), also can calculate acquisition (TDD system) according to the base station to the channel matrix antithesis of subscriber equipment by subscriber equipment self.

Afterwards, subscriber equipment is determined the transmitting power of each transmitting antenna according to formula (3)～(7), and with the transmitting power of determined each transmitting antenna, carries out transfer of data on uplink transport channel.

In above description, at each step, enumerated a plurality of examples, though the inventor indicates example associated with each other as much as possible, this does not also mean that must there be corresponding relation in these examples according to corresponding label.As long as selected example do not have contradiction between given condition, can in different steps, select the not corresponding example of label to constitute the corresponding techniques 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 can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.

Claims (10)

1. the Poewr control method of a up multi-input multi-ouput channel comprises:

At each transmission block,

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

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

At all transmission blocks,

Subscriber equipment is determined the transmitting power of each transmit antennas according to the transmitting power that is mapped to each layer of each transmit antennas; And

Subscriber equipment is carried out transfer of data with the transmitting power of determined each transmit antennas on uplink transport channel.

2. the Poewr control method of up multi-input multi-ouput channel according to claim 1 is characterized in that:

Adopt in the uplink mode under the situation of space division multiplexing,

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

Each of same transmission block layer shared same array gain, same modulation coding mode and same power are adjusted parameter.

3. the Poewr control method of up multi-input multi-ouput channel according to claim 1 is characterized in that:

Array gain is

By the base station by obtaining and be notified to subscriber equipment after the measurement of uplink reference signals is calculated; Perhaps

Calculate according to channel condition information and precoding vector by the base station and to obtain and be notified to subscriber equipment; Perhaps

The base station is by the control dynamic parameter that signaling disposed, and 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, perhaps 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 up multi-input multi-ouput channel according to claim 1 is characterized in that:

Array gain is disposed by the control signaling by the base station or is defaulted as 0.

5. the Poewr control method of up multi-input multi-ouput channel according to claim 1 is characterized in that:

Under the situation of space division multiplexing, the base station is array gain of each transmission block configuration by the control signaling,

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

If the uplink mode does not adopt transmission block displacement mapping or layer displacement mapping, then 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 up multi-input multi-ouput channel according to claim 1 is characterized in that:

Under the situation of time division duplex, subscriber equipment utilizes the reciprocity of up-downgoing channel, obtains the estimation of up channel, finish the calculating of array gain thus separately, and subscriber equipment reports the base station with the array gain value.

7. the Poewr control method of up multi-input multi-ouput channel 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;

Under the situation of using Cubic Metric Preserving precoding vector, the maximum transmission power of layer is the maximum transmission power of described layer of antenna that is shone upon;

Under the situation of using Cubic Metric Friendly precoding vector, a plurality of 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 the base station semi-static or dynamic-configuration.

8. the Poewr control method of up multi-input multi-ouput channel according to claim 1 is characterized in that:

If the uplink mode adopts layer displacement mapping, then a plurality of transmission blocks are shared a power and are adjusted parameter,

If the uplink mode does not adopt layer displacement mapping, then each transmission block has power adjustment parameter separately.

9. the Poewr control method of up multi-input multi-ouput channel according to claim 1 is characterized in that:

Adopt in the uplink mode under the situation of spatial reuse and use Cubic Metric Preserving precoding vector, the actual emission power of antenna depends on the size of transmitting power of the layer of launching on this antenna, the array gain value of transmission block and the transmission antenna group of this transmission block, the two channel that is constituted of base station reception antenna are relevant with precoding vector.

10. the Poewr control method of up multi-input multi-ouput channel according to claim 1 is characterized in that:

Adopt spatial reuse and use under the situation of Cubic Metric Friendly precoding vector in the uplink mode, if the transmitting power of each layer is identical, then the transmitting power of antenna depends on the number of layer of this antenna actual transmission and the transmitting power of layer; If at least one parameter that the modulation coding mode of each transmission block, array gain and power are adjusted in the parameter is different, then different transmission blocks the layer transmitting power also inequality, the transmitting power of antenna depend on this antenna actual transmission each layer transmitting power and.

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