CN102378339B - Power reduction method used under carrier aggregation power control condition - Google Patents

Abstract

The invention discloses a kind of power reduction methods polymerizeing under power control scene for carrier wave, and this method is the actual power to carrier wave first Equal proportion reduction is carried out, if

Greater than power limit PCMAX, the c of carrier wave, then by the actual power of carrier wave

Truncation is PCMAX, c, and the power that carrier wave is truncated gives remaining carrier wave,

Indicate the coefficient of diminution of carrier wave,

Wherein

PCMAX indicates the general power limitation of terminal, and PPUCCH (i) indicates the transimission power of control channel, Indicate the sum of the transimission power of carrier wave containing control signaling,

Indicate the sum of the transimission power of carrier wave for not including control signaling, cnoUCI indicates that the carrier wave for not including control signaling, cUCI indicate the carrier wave containing control signaling. The method of the invention solves the problems, such as how to make power reduction minimum to the destroying infection of the link circuit self-adapting of scheduler, reduce the influence to power distribution in uplink scheduling to a certain extent simultaneously, and this method does not have to compute repeatedly, and has a compromise in performance and complexity.

Description

A kind of for the power reduction method under carrier aggregation power control scene

Technical field

The invention belongs to wireless communication technology field, relate to the algorithm in uplink power control, relate in particular to a kind of for the power reduction method under carrier aggregation power control scene.

Background technology

At present, the standardization effort of IMT-A (dvanced) is at home and abroad shown great attention to.IMT-A has stipulated that downlink transfer speed reaches 1Gbps, up for 500Mbps, and has stipulated to support that using system is maximum bandwidth is not less than 40MHz as the concrete specification requirement of IMT-A system.3GPP, in order to have released based on announced LTE standard the standard LTE-A that meets IMT-A demand, does further expansion to the bandwidth of LTE system, and determines the expansion that the mode that adopts carrier aggregation is realized to system bandwidth.At present, 3GPP is discussing the Poewr control method under carrier aggregation, wherein mentioned when in uplink power control, each carrier wave transmitted power summation is greater than terminal (UE) maximum transmit power, need to reduce the transmitted power on each carrier wave, concrete power reduction coefficient method is also in further discussing.

In LTE-A, ascending power distribution is mainly used in link circuit self-adapting, and still, due to the restriction of UE maximum transmitted gross power, UE will carry out power reduction to the power of each carrier wave, and this will destroy the effect of link circuit self-adapting.In 3GPP LTE-A standardization, associating Nuo Xiya company of Nokia-Siemens Networks Co., Ltd has proposed a kind of method of carrying out equal proportion power reduction for the front power of blocking of each carrier wave.In the method, proposed an equation group, for describing the rule of power reduction, by solving equations, can obtain the coefficient of power reduction, for convenience of subsequent descriptions, the method has been defined as to method B.The solution procedure of method B can be summarized as: to equation group

carry out iterative, wherein work as w _cduring > 1, be set to w _c=1, then carry out iterative solution equation group.Owing to meeting equal proportion principle, the coefficient of the reduction that the method obtains is optimum, and still, the method may cause equation group to carry out repeatedly iterative, and this is complicated by what cause UE to process.

In addition, associating Nuo Xiya company of Nokia-Siemens Networks Co., Ltd has also proposed a kind of for the rear power of blocking of each carrier wave, carry out the method for equal proportion power reduction, although the method is simple, but not but optimum, especially those are blocked to the carrier wave that front power ratio is larger and carry out power reduction, the effect of possible heavy damage link circuit self-adapting, this will cause larger impact to the average behavior of transmission.In order to facilitate subsequent descriptions, the method is defined as to method A, method A can be summarized as:

Summary of the invention

Technical problem to be solved by this invention is: provide a kind of for the power reduction method under carrier aggregation power control scene, the method is minimum to the destroying infection of the link circuit self-adapting of scheduler.

For solving the problems of the technologies described above, the present invention adopts following technical scheme.

For the power reduction method under carrier aggregation power control scene, first described power reduction method is the actual power to carrier wave carry out equal proportion reduction, if be greater than the Power Limitation P of carrier wave _{cMAX, c}, by the actual power of carrier wave

block as P _{cMAX, c}, and the power that carrier wave is truncated gives remaining carrier wave,

the coefficient of diminution that represents carrier wave,

wherein

p _cMAXrepresent the gross power restriction of terminal, P _pUCCH(i) represent the through-put power of control channel,

the through-put power sum of the carrier wave that expression contains control signal,

expression does not comprise the through-put power sum of the carrier wave of control signal, c _noUCIrepresent not comprise the carrier wave of control signal, c _uCIrepresent the carrier wave that contains control signal.

As a preferred embodiment of the present invention, described power reduction method specifically comprises the following steps:

The first step, the first actual power to carrier wave

carry out equal proportion reduction, coefficient of diminution if all carrier waves all satisfy condition

power reduction completes; Otherwise, jump to second step;

Second step, will own

the power of carrier wave block as P _{cMAX, c}even, the power P after the power control of carrier wave _{pUSCH, c}(i)=P _{cMAX, c}, power reduction coefficient w corresponding to carrier wave being now truncated _c=1; Utilize formula

obtain the P upgrading _t, c wherein _tRUNCthe carrier wave blocking for required power; P with described renewal _tpower reduction method described in the repetition first step, until the carrier wave except the carrier wave being blocked by power satisfies condition

now the coefficient of diminution of the carrier wave except the carrier wave being blocked by power is

power reduction finishes.

As another kind of preferred version of the present invention, described power reduction specifically comprises the following steps:

The first step, the power control power P of carrier wave _{pUSCH, c}(i) be divided into two classes:

Type i:

the actual power that represents carrier wave, P in note type i _{pUSCH, c}(i) gross power is

, use C _irepresent the set of carrier wave in type i;

Type II: it is right to need

block P _{pUSCH, c}(i)=P _{cMAX, c}, P in note Type II _{pUSCH, c}(i) gross power is , use C _iIrepresent the set of carrier wave in Type II;

Second step, to two class P _{pUSCH, c}(i) carry out generally equal proportion power division P _iand P _iI:

The power that type i is distributed:

The power that Type II is distributed:

If

to P _iIblock, and the power blocking is given to P _i, that is:

p ' _i=P _i+ P _iI-P ' _iI;

The 3rd step, the power control power P to carrier wave _{pUSCH, c}(i) reduce:

Type i is had:

separating this formula can obtain

Type II is had:

separating this formula can obtain

Beneficial effect of the present invention is: the method for the invention has solved the problem of power reduction to the destroying infection minimum of the link circuit self-adapting of scheduler that how to make, reduced to a certain extent the impact on power division in uplink scheduling simultaneously, and the method is without double counting, has a compromise in performance and complexity.

Accompanying drawing explanation

Fig. 1 is the flow chart of method described in embodiment mono-;

Fig. 2 is the flow chart of method described in embodiment bis-;

Fig. 3 is simulation result comparison diagram.

Embodiment

The present invention is directed to the front power of blocking of each carrier wave and carry out equal proportion power reduction (equating at least as far as possible), the execution of link circuit self-adapting is distributed to each carrier wave, thereby reach a kind of effect that is similar to diversity.For convenience of description of the invention, introduce following definition:

${\tilde{P}}_{\mathrm{PUSCH},c}\left(i\right)=10\&CenterDot;{\log }_{10}{M}_c\left(i\right)+{\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HSA00000232742500031.png"\; state="\{\{state\}\}">P</figure-callout>}}_{0\_\mathrm{PUSCH},c}\left(I\right)+{\mathrm{\&alpha;}}_c\left(i\right)\&CenterDot;\mathrm{PL}+{\mathrm{\&Delta;}}_{\mathrm{MCS},c}\left(i\right)+f_c\left(\mathrm{\&Delta;}\left(i\right)\right)---\left(1\right)$

the relevant power of scheduling that represents carrier wave c, M _c(i) represent physical resource number of blocks, P _{0_PUSCH, c}(i) represent to distribute to the nominal power of PUSCH, α _c(i) represent the relevant adjustment parameter in Serving cell, PL represents path loss, Δ _{mCS, c}(i) represent the power adjustment relevant to coded modulation, f _c(Δ (i)) represents the power adjustment being determined by base station power control command.

Power control formula is:

$P_{\mathrm{PUSCH},c}\left(i\right)=\min (P_{\mathrm{CMAX},c}-P_{\mathrm{PUCCH}}\left(i\right),{\tilde{P}}_{\mathrm{PUSCH},c}\left(i\right))---\left(2\right)$

P _{pUSCH, c}(i) represent the power after carrier wave c power control, P _{cMAX, c}the Power Limitation that represents carrier wave c, P _pUCCH(i) represent the through-put power of control channel,

represent the power after carrier wave c blocks.

P _PUCCH(i)＝min(P _CMAX，c，P _{0_PUCCH}+PL+h(n _HARQ，n _CQI)+Δ _{F_PUCCH}(F)+g(i)) (3)

P _pUCCH(i) represent the through-put power of control channel, P _{cMAX, c}the Power Limitation that represents carrier wave c, P _{0_PUCCH}the nominal power that represents to distribute to PUCCH, PL represents path loss, h (n _hARQ, n _cQI) represent the power adjustment relevant to PUCCH form, Δ _{f_PUCCH}(F) power adjustment that expression is configured by upper-layer protocol, g (i) represents the power adjustment being determined by base station power control command.

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Embodiment mono-

It is a kind of for the power reduction method under carrier aggregation power control scene that the present embodiment provides, and first the method is the actual power to carrier wave

reduce, if

( the coefficient of diminution that represents carrier wave) be greater than the Power Limitation P of carrier wave _{cMAX, c}, the power of carrier wave is blocked as P _{cMAX, c}, and the power that carrier wave is truncated gives remaining carrier wave, this process can be divided into following two steps:

The first step, the first actual power to carrier wave

carry out equal proportion reduction, coefficient of diminution

if all carrier waves all satisfy condition

power reduction completes; Otherwise, jump to second step; Wherein p _cMAXrepresent the gross power restriction of terminal, P _pUCCH(i) represent the through-put power of control channel,

the through-put power sum of the carrier wave that expression contains control signal, c _noUCIrepresent not comprise the carrier wave (being data carrier) of control signal, c _uCIrepresent the carrier wave that contains control signal.

Second step, will own

the power of carrier wave block as P _{cMAX, c}even, P _{pUSCH, c}(i)=P _{cMAX, c}, the power reduction coefficient w that now these carrier waves are corresponding _c=1; P _tdeduct the power P after these carrier wave reductions _{pUSCH, c}(i),

obtain the P upgrading _t, c wherein _tRUNCthe carrier wave blocking for required power; Jump to the P after upgrading for the first step _tcarry out again power reduction, until remaining carrier wave (remove and carry out the carrier wave that power blocks) satisfies condition

the coefficient of diminution of these carrier waves is:

power reduction finishes.

The advantage of the power reduction method described in the present embodiment is the power before directly each carrier wave being blocked

reduce, reduced as much as possible the resultant impact on power division in uplink scheduling, the power from reduction distributes, with

distribution more approaching, the error of approaching is less.Equal proportion power reduction method described in the present embodiment is applicable to each P _{pUSCH, c}(i) carry out the power reduction of equal proportion optimum, the method has solved the problem of power reduction to the destroying infection minimum of the link circuit self-adapting of scheduler that how to make.The method is carried out equal proportion power reduction to the front power of blocking of each carrier wave, this destroying infection can be minimized, thereby reach optimum solution.

Be the concrete application example of the power reduction method described in the present embodiment below:

Suppose that carrier aggregation has 5 carrier waves, due to the Power Limitation of terminal, the Power Limitation of setting each carrier wave is respectively P _{cMAX, 1}=260mw, P _{cMAX, 2}=270mw, P _{cMAX, 3}=260mw, P _{cMAX, 4}=280mw, P _{cMAX, 5}=270mw; The gross power of setting terminal is restricted to P _cMAX=600mw; The actual power of setting each carrier wave is

terminal is found afterwards through power control formula (2) now need each carrier power to carry out power reduction, according to the power reduction method described in the present embodiment, can draw:

The first step,

Second step:

now can obtain w ₃=1, P _{pUSCH, 3}(i)=260mw.

Repeating the first step can obtain:

now by

can obtain:

Embodiment bis-

Power reduction method described in embodiment mono-is that the power before blocking carries out equal proportion reduction for each carrier wave, but this method needs iteration, and power reduction method described in the present embodiment is the power P carrier wave _{pUSCH, c}(i) be divided into two classes, and every class is done to the as a whole equal proportion distribution of carrying out, so just do not need loop iteration, concrete grammar is as follows:

The first step, the power P of carrier wave _{pUSCH, c}(i) be divided into two classes:

Type i: after application power control formula (2),

remember such P _{pUSCH, c}(i) gross power is

, use C _irepresent the set of such carrier wave;

Type II: after application power control formula (2), it is right to need

block P _{pUSCH, c}(i)=P _{cMAX, c}, remember such P _{pUSCH, c}(i) gross power is

, use C _iIrepresent the set of such carrier wave.

Second step, to two class P _{pUSCH, c}(i) carry out generally equal proportion power division P _iand P _iI:

The power that type i is distributed:

The power that Type II is distributed:

If to P _iIblock, and the power blocking is given to P _i, that is:

p ' _i=P _i+ P _iI-P ' _iI.

The 3rd step: to the power P being obtained by formula (2) _{pUSCH, c}(i) reduce:

Type i is had:

separating this formula can obtain

Type II is had:

separating this formula can obtain

Described in the present embodiment, the advantage of method is that the power of the every class carrier wave before blocking is carried out to integral body reduction, after distributing the gross power of every class with block before total power profile more approaching, to a certain extent, reduced the impact on power division in uplink scheduling, and the method is without double counting, has a compromise in performance and complexity.

Be the concrete application example of the power reduction method described in the present embodiment below:

Suppose that carrier aggregation has 5 carrier waves, due to the Power Limitation of terminal, the Power Limitation of setting each carrier wave is P _{cMAX, 1}=260mw, P _{cMAX, 2}=270mw, P _{cMAX, 3}=260mw, P _{cMAX, 4}=280mw, P _{cMAX, 5}=270mw; The gross power of setting terminal is restricted to P _cMAX=600mw; The power that configuration scheduling is relevant is respectively

terminal is found afterwards through power control formula (2)

now need each carrier power to carry out power reduction, according to the power reduction method described in the present embodiment, can draw:

The first step: the carrier wave that belongs to type i is 1,2,4,5;

The carrier wave that belongs to Type II is 3;

Second step:

$P_{\mathrm{II}}=\frac{{\tilde{P}}_{\mathrm{II}}}{{\tilde{P}}_I+{\tilde{P}}_{\mathrm{II}}}\&times;P_{\mathrm{CMAX}}=\frac{330}{400+330}\&times;600=271.2329;$

So, P ' _iI=P _{cMAX, 3}=260mw, P ' _i=600-260=340mw;

The 3rd step: w ₃=1,

Embodiment tri-

The present embodiment mainly compares the power reduction method described in embodiment mono-and embodiment bis-and traditional power reduction method A and method B, is mainly power w after contrast reduction _cp _pUSCHc(i) and with block front power

ratio, if this ratio is (the equating at least as far as possible) equating, the situation of each carrier wave of can having thought considering of balance, is better like this distributed to each carrier wave power reduction to the impact of scheduling.

Equation quantitative description from the method (claiming again method two) can see embodiment bis-to the analysis of four kinds of methods described in the requirement of this equal proportion, and method described in embodiment mono-is to have realized for each equally

carry out equal proportion.Therefore,, from impact is disperseed to this meaning, method (claiming again method one) is optimum described in method B and embodiment mono-.The present embodiment be take method B as benchmark, defines the difference coefficient of the power of power and method B after a reduction:

e wherein ⁽ⁿ⁾the difference coefficient of method for expressing n, the power reduction coefficient that method for expressing n obtains.The difference coefficient E of certain method ⁽ⁿ⁾less, power reduction effect and method B are more approaching, can think and approach optimum.

By following simulation parameter is set: set 4 carrier waves, in each carrier wave without the PUSCH maximum power P of UCI _{cMAX, c}=[0.6,0.7,0.7,0.8]; The maximum gross power of UE

be that the maximum gross power of UE is 50% of each carrier wave maximum power summation; Power before each carrier wave blocks for random distribution.The result of emulation as shown in Figure 3.Simulation result shows, the difference power value coefficient E of method one ⁽³⁾=0, illustration method one and method B draw identical result.E ⁽¹⁾< E ⁽²⁾< E ^(A)the effect ratio method one of illustration method two is poor, but ratio method A is good.Due to the equivalence of method one and method B, therefore the method described in embodiment mono-(being method one) can replace method B completely in the present invention, thereby realize optimal power reduction, and the shortcoming of method B is to want iterative solution equation group, and method one need not.

Here description of the invention and application is illustrative, not wants by scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and for those those of ordinary skill in the art, the various parts of the replacement of embodiment and equivalence are known.Those skilled in the art are noted that in the situation that not departing from spirit of the present invention or substantive characteristics, and the present invention can be with other forms, structure, layout, ratio, and realizes with other elements, material and parts.

Claims (3)

1. for the power reduction method under carrier aggregation power control scene, it is characterized in that: first described power reduction method is the actual power to carrier wave

carry out equal proportion reduction, if

be greater than the Power Limitation P of carrier wave _{cMAX, c}, by the actual power of carrier wave

block as P _{cMAX, c}, and the power that carrier wave is truncated gives remaining carrier wave,

the coefficient of diminution that represents carrier wave,

wherein $P_T=P_{\mathrm{CMAX}}-P_{\mathrm{PUCCH}}\left(i\right)-\underset{c_{\mathrm{UCI}}}{\mathrm{\&Sigma;}}{P}_{\mathrm{PUSCH},c}\left(i\right),P_{\mathrm{CMAX}}$ Represent the gross power restriction of terminal, P _pUCCH(i) represent the through-put power of control channel,

the through-put power sum of the carrier wave that expression contains control signal,

expression does not comprise the through-put power sum of the carrier wave of control signal, c _noUCIrepresent not comprise the carrier wave of control signal, c _uCIrepresent the carrier wave that contains control signal; $P_{\mathrm{PUSCH},c}\left(i\right)=\min (P_{\mathrm{CMAX},c}-P_{\mathrm{PUCCH}}\left(i\right),{\tilde{P}}_{\mathrm{PUSCH},c}\left(i\right)),$ P _{pUSCH, c}(i) represent the power after carrier wave c power control, P _{cMAX, c}the Power Limitation that represents carrier wave c, P _pUCCH(i) represent the through-put power of control channel,

represent the power after carrier wave c blocks.

2. according to claim 1ly for the power reduction method under carrier aggregation power control scene, it is characterized in that, described power reduction method specifically comprises the following steps:

The first step, the first actual power to carrier wave

carry out equal proportion reduction, coefficient of diminution if all carrier waves all satisfy condition

power reduction completes; Otherwise, jump to second step;

Second step, will own

the power of carrier wave block as P _{cMAX, c}even, the power P after the power control of carrier wave _{pUSCH, c}(i)=P _{cMAX, c}, power reduction coefficient w corresponding to carrier wave being now truncated _c=1; Utilize formula $P_T=P_{\mathrm{CMAX}}-P_{\mathrm{PUCCH}}\left(i\right)-\underset{c_{\mathrm{HCI}}}{\mathrm{\&Sigma;}}{P}_{\mathrm{PUSCH},c}\left(i\right)-\underset{c_{\mathrm{TRUNC}}}{\mathrm{\&Sigma;}}{P}_{\mathrm{PUSCH},c}\left(i\right)$ Obtain the P upgrading _t, c wherein _tRUNCthe carrier wave blocking for required power; P with described renewal _tpower reduction method described in the repetition first step, until the carrier wave except the carrier wave being blocked by power satisfies condition

now the coefficient of diminution of the carrier wave except the carrier wave being blocked by power is

power reduction finishes.

3. according to claim 1ly for the power reduction method under carrier aggregation power control scene, it is characterized in that, described power reduction specifically comprises the following steps:

The first step, the power control power P of carrier wave _{pUSCH, c}(i) be divided into two classes:

Type

the actual power that represents carrier wave, P in note type i _{pUSCH, c}(i) gross power is

use C _irepresent the set of carrier wave in type i;

Type II: it is right to need

block P _{pUSCH, c}(i)=P _{cMAX, c}, P in note Type II _{pUSCH, c}(i) gross power is

use C _iIrepresent the set of carrier wave in Type II;

Second step, to two class P _{pUSCH, c}(i) carry out generally equal proportion power division P _iand P _iI:

The power that type i is distributed: $P_I=\frac{{\tilde{P}}_I}{{\tilde{P}}_I+{\tilde{P}}_{\mathrm{II}}}\&times;[P_{\mathrm{CMAX}}-P_{\mathrm{PUCCH}}\left(i\right)-\underset{c_{\mathrm{UCI}}}{\mathrm{\&Sigma;}}{P}_{\mathrm{PUSCH},c}\left(i\right)]$

The power that Type II is distributed: $P_{\mathrm{II}}=\frac{{\tilde{P}}_{\mathrm{II}}}{{\tilde{P}}_I+{\tilde{P}}_{\mathrm{II}}}\&times;[P_{\mathrm{CMAX}}-P_{\mathrm{PUCCH}}\left(i\right)-\underset{c_{\mathrm{UCI}}}{\mathrm{\&Sigma;}}{P}_{\mathrm{PUSCH},c}\left(i\right)]$

If

to P _iIblock, and the power blocking is given to P _i, that is: $P_{\mathrm{II}}^{\&prime;}=\underset{c\&Element;C_{\mathrm{II}}}{\mathrm{\&Sigma;}}{C}_{\mathrm{CMAX},c},{P^{\&prime;}}_I=P_I+P_{\mathrm{II}}-{P^{\&prime;}}_{\mathrm{II}};$

The 3rd step, the power control power P to carrier wave _{pUSCH, c}(i) reduce:

Type i is had: $\underset{c\&Element;C_I}{\mathrm{\&Sigma;}}{w}_c\&CenterDot;P_{\mathrm{PUSCH},c}\left(i\right)={P^{\&prime;}}_I,$ Separating this formula can obtain $w_c=\frac{{P^{\&prime;}}_I}{\underset{c\&Element;C_I}{\mathrm{\&Sigma;}}{P}_{\mathrm{PUSCH},c}\left(i\right)}$

Type II is had: $\underset{c\&Element;C_{\mathrm{II}}}{\mathrm{\&Sigma;}}{w}_c\&CenterDot;P_{\mathrm{PUSCH},c}\left(i\right)={P^{\&prime;}}_{\mathrm{II}},$ Separating this formula can obtain $w_c=\frac{{P^{\&prime;}}_{\mathrm{II}}}{\underset{c\&Element;C_{\mathrm{II}}}{\mathrm{\&Sigma;}}{P}_{\mathrm{PUSCH},c}\left(i\right)}.$

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