CN102573028A - Open loop power controlling method and system - Google Patents

Abstract

The invention discloses an open loop power controlling method and system by which a base station can effectively control the emitting power of user equipment (UE) during the open loop power controlling process, without need of adding extra controlling signaling for informing the UE of changing power. The method comprises the following steps: a first power control parameter is set according to system target interference over thermal (IOT) and determined target signal interference noise ratio (SINR), wherein the first power control parameter includes the nominal target receiving power spectrum density and path loss compensating factor of the UE when the modulation encoding mode power offset of the UE is not enabled, and the first power control parameter includes the nominal target receiving power spectrum density and path loss compensating factor of the UE and modulation encoding mode power offset of the UE when the modulation encoding mode power offset of the UE is enabled; the emission bandwidth of the UE is adjusted according to the obtained target receiving power spectrum density and the current transmission requirement of the UE; and the emission power of the UE is adjusted by utilizing the first power control parameter and the emission bandwidth of the UE.

Description

A kind of open-loop power control method and system

Technical field

The present invention relates to wireless communication technology field, be meant a kind of open-loop power control method and system especially.

Background technology

Power control techniques is as a kind of key technology of wireless communication field; Reached and be used widely in 3G (3rd Generation) system afterwards at cdma system; Follow-up long evolving system (LTE, Long-Term Evolution, LTE); LTE-A (LTE Advanced) also adopts this technology.

Power control techniques comprises that open Loop Power control and closed power control two aspect contents; Wherein open Loop Power control do not have feedback unilaterally according to the link metrical information to subscriber equipment (UE; User Equipment) process that transmitting power is adjusted, closed power control then be a kind of can be according to the adaptive power control process of adjustment again of the effect after the adjustment.As far as with whole control function of power, open Loop Power control is that meat and potatoes also is indispensable part, and the function that the closed power controlling value is superimposed upon on the open Loop Power control basis belongs to the optimization part to systematic function.Be necessary for UE is provided with an appropriate transmitting power in the GSM, control function of power is indispensable.Closed power control is as the system optimization function, and its complex design and control signaling UE that need be extra cause a kind of good open Loop Power control algorithm of design to become a stubborn problem.

Closed loop power control algorithm is owing to complex design and need extra control signaling UE to change power.Conventional open Loop Power control algorithm owing to do not notify the control signalling path of the change power of UE, causes the base station can't control the transmitted power of UE fully, thereby makes the received power of presence of intercell interference and UE can not get better controlling, influences systematic function.

Summary of the invention

The present invention provides a kind of open-loop power control method and system, makes the base station in the open Loop Power control process, can effectively control the transmitting power of UE, need not to increase extra control signaling UE again and changes power.

A kind of open-loop power control method provided by the invention comprises:

According to aims of systems IOT and definite target SINR first power contorl parameters is set; Wherein, Under the situation that the modulation coding mode power offset of UE does not enable; Said first power contorl parameters comprises nominal target received power spectrum density and the path loss compensating factor of UE; Under the situation that the modulation coding mode power offset of UE enables, said first power contorl parameters comprises the modulation coding mode power offset of nominal target received power spectrum density, path loss compensating factor and the UE of UE; And

According to the target received power spectrum density of the UE that obtains, the transmitted bandwidth of this transmission demand adjustment of UE UE;

Utilize the transmitted bandwidth of said first power contorl parameters and said UE, the transmitting power of adjustment UE.

A kind of open Loop Power control provided by the invention system comprises:

First power contorl parameters is confirmed the unit; Be used for first power contorl parameters being set according to aims of systems IOT and definite target SINR; Wherein, Under the situation that the modulation coding mode power offset of UE does not enable; Said first power contorl parameters comprises nominal target received power spectrum density and the path loss compensating factor of UE, and under the situation that the modulation coding mode power offset of UE enables, said first power contorl parameters comprises the modulation coding mode power offset of nominal target received power spectrum density, path loss compensating factor and the UE of UE;

Parameter acquiring unit is used to obtain target received power spectrum density, this transmission demand of UE and the QoS parameter of UE;

The bandwidth adjustment unit is used for according to the target received power spectrum density of the UE that obtains and the transmitted bandwidth of this transmission demand adjustment of UE UE;

Power control unit is used to utilize the transmitted bandwidth of said first power contorl parameters and said UE, the transmitting power of adjustment UE.

The embodiment of the invention is provided with first power contorl parameters according to aims of systems IOT and target SINR, according to the transmitted bandwidth of the target received power spectrum density that obtains UE and this transmission demand adjustment of UE UE; Utilize the transmitted bandwidth of said first power contorl parameters and said UE, the transmitting power of adjustment UE.This scheme both can effectively have been controlled the transmitting power of UE through changing bandwidth, can control the received power spectrum density again, changed power and need not to increase extra control signaling UE.

Description of drawings

Fig. 1 is an open-loop power control method flow chart of the present invention;

Fig. 2 is the open-loop power control method idiographic flow sketch map of the embodiment of the invention;

Fig. 3 is the open Loop Power control system configuration sketch map of the embodiment of the invention.

Embodiment

For effectively controlling the transmitting power of UE; Need not to increase extra control signaling UE again and change power; Disturb the ratio (IOT with noise sum and noise according to aims of systems among the present invention program; Interference Over Thermal)) and echo signal interference-to-noise ratio (SINR) first power contorl parameters is set, according to the transmitted bandwidth of this transmission demand adjustment of UE UE of the target received power spectrum density of UE and acquisition; Utilize the transmitted bandwidth of said first power contorl parameters and said UE, obtain the transmitting power of UE.

Referring to shown in Figure 1, the present invention realizes that the idiographic flow of open Loop Power control is following:

Step 101: first power contorl parameters is set according to aims of systems IOT and target SINR.

Wherein, under the situation that the modulation coding mode power offset of UE does not enable, said first power contorl parameters comprises nominal target received power spectrum density and the path loss compensating factor of UE.

Under the situation that the modulation coding mode power offset of UE enables, said first power contorl parameters comprises the modulation coding mode power offset of nominal target received power spectrum density, path loss compensating factor and the UE of UE.

Under the situation that the modulation coding mode power offset of UE does not enable, then target SINR, aims of systems IOT and the PL according to UE confirms P ₀, α; Under the situation that the coded system power offset of UE enables, then target SINR, aims of systems IOT and the PL according to UE confirms P ₀, α and P _{Δ MCS}, wherein,

P ₀Be the nominal target received power spectrum density of UE, P ₀=P _{0_Cell}+ P _{0_UE}, P wherein _{0_Cell}Be cell-level received power spectrum density, P _{0_UE}Be UE level received power spectrum density side-play amount, value is relevant with the IOT of system with target SINR, and unit is dBm;

α is the path loss compensating factor, α ∈ [0,1];

PL is the radio propagation path loss that the terminal measures, and unit is dB;

P _{Δ MCS}Modulation coding mode power offset for UE.

And then, can confirm target received power spectrum density, wherein PSD according to following formula _RXBe the target received power spectrum density:

${\mathrm{PSD}}_{\mathrm{Rx}}=\left\{\begin{array}{c}{P}_0+(\mathrm{\α}-1)\·\mathrm{PL}[+P_{\mathrm{\ΔMCS}}],\mathrm{forM}\≤{10}^{\frac{P_{\max }-P_0-\mathrm{\αPL}[-P_{\mathrm{\ΔMCS}}]}{10}}\\ P_{\max }-\mathrm{PL}-10{\log }_{10}\left(M\right),\mathrm{else}\end{array}\right.$

Step 102: according to the transmitted bandwidth of target received power spectrum density, this transmission demand of UE and the QoS parameter adjustment UE of the UE that obtains.

Step 103: utilize the transmitted bandwidth of said first power contorl parameters and said UE, obtain the transmitting power of UE.

Open Loop Power control can formulate be:

P _{Tx_UE}=min (P _Max, 10log ₁₀(M)+P ₀+ α PL [+P _{Δ MCS}]), wherein [] expression is optional

Parameter declaration is following in the following formula:

P _Max, UE maximum transmission power, the dBm of unit

M, UE divide the bandwidth resources number;

P ₀, the nominal target received power spectrum density of UE, P ₀=P _{0_Cell}+ P _{0_UE}, P wherein _{0_Cell}Be cell-level, received power spectrum density, P _{0_UE}Be UE level received power spectrum density side-play amount, value is relevant with the IOT of system with target SINR, the dBm of unit;

α, path loss compensating factor, α ∈ [0,1];

The radio propagation path loss that PL, UE measure is called for short path loss, the dB of unit;

P _{Δ MCS}, the modulation coding mode of UE (MCS, Modulation and Coding Scheme) power offset; Embody the poor of coding gain between each MCS, corresponding fixing power offset between each MCS, this parameter is an optional parameters; Can select to enable or do not enable the dB of unit;

Specify the technical scheme of the inventive method below.

Present embodiment adopts compensation of part path loss and P _{Δ MCS}Do not enable the open loop principle, be described below step by step with reference to accompanying drawing 2:

Step 201: confirm first power contorl parameters.Wherein, Under the situation that the modulation coding mode power offset of UE does not enable; Said first power contorl parameters comprises nominal target received power spectrum density and the path loss compensating factor of UE; Under the situation that the modulation coding mode power offset of UE enables, said first power contorl parameters comprises the modulation coding mode power offset of nominal target received power spectrum density, path loss compensating factor and the UE of UE.

Present embodiment adopts compensation of part path loss and P _{Δ MCS}Do not enable the open loop principle, thereby the transmitting power of UE can be represented as follows: P _{Tx_UE}=min (P _Max, 10log ₁₀(M)+P ₀+ α PL), α ∈ (0,1) wherein;

According to aims of systems IOT, maximum target SINR and minimum target SINR above-mentioned open Loop Power control parameter is set, note target IOT is IOT _Target, maximum target SINR is SINR _{Target_Max}, minimum target SINR is SINR _{Targ et_M in}, SINR wherein _{Max_T arg et}The highest MCS (is designated as MCS according to the sub-district _Center) demodulation SINR is given, SINR _{T arg et_M in}MCS (is designated as MCS according to the cell edge target _Edge) demodulation SINR is given, IOT _TartetFor the networking parameter is provided by the network planning;

IOT _Target, SINR _{Target_Max}, SINR _{Target_Min}, P ₀, α, PL, between relation represent as follows:

$\left\{\begin{array}{c}{\mathrm{PSD}}_{\mathrm{Tx}}-\mathrm{PL}=\mathrm{SINR}+{\mathrm{IOT}}_{T\arg \mathrm{et}}+\mathrm{Noise}\\ {\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Max}}\≤\mathrm{SINR}\≤{\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Min}}\end{array}\right.,$

Wherein

PSD _TxBe the transmitting power on the transmit power spectral density representation unit bandwidth, Noise is that constant is represented white Gaussian noise, will contain a substitution of outer loop parameter;

Then: $\left\{\begin{array}{c}\mathrm{SINR}=P_0+\mathrm{\α}\·\mathrm{PL}-\mathrm{PL}-{\mathrm{IOT}}_{T\mathrm{Arg}\mathrm{Et}}-\mathrm{Noise}\\ {\mathrm{SINR}}_{T\mathrm{Arg}\mathrm{Et}\_\mathrm{Max}}\≤\mathrm{SINR}\≤{\mathrm{SINR}}_{T\mathrm{Arg}\mathrm{Et}\_\mathrm{Min}}\end{array}\right.,$

For center of housing estate UE, its path loss is less, and target SINR gets maximum SINR _{T arg et_Max}, establishing at this moment, path loss is PL _NearFor cell edge UE, its path loss is bigger, and target SINR gets minimum value SINR _{T arg et_Min}, design path loss this moment is PL _Far, then:

$\left\{\begin{array}{c}{\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Max}}=P_0+\mathrm{\α}\·{\mathrm{PL}}_{\mathrm{near}}-{\mathrm{PL}}_{\mathrm{near}}-{\mathrm{IOT}}_{T\arg \mathrm{et}}-\mathrm{Noise}\\ {\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Min}}=P_0+\mathrm{\α}\·{\mathrm{PL}}_{\mathrm{near}}-{\mathrm{PL}}_{\mathrm{near}}-{\mathrm{IOT}}_{T\arg \mathrm{et}}-\mathrm{Noise}\end{array}\right.$

Can confirm P fully thus ₀Value with α.

Step 202: obtain target received power spectrum density and this transmission demand.This transmission demand can be QoS parameter.

Obtain the desired value and the maximum of this transmission of current scheduling UE, be designated as TBS respectively _{T arg et}And TBS _Max, and TBS _{T arg et}≤TBS _Max

Step 203: according to relation and the TBS between UE transmitted bandwidth and the target received power spectrum density _{T arg et}, TBS _MaxThe transmitted bandwidth M of adjustment UE.

The maximal received power spectrum density PSD of given UE only in the open Loop Power control parameter _Rx, PSD under the prerequisite confirmed of PL in fact _RxAlso with monotone decreasing, the physical relationship formula is described below with bandwidth M:

${\mathrm{PSD}}_{\mathrm{Rx}}=\left\{\begin{array}{c}{P}_0+(\mathrm{\α}-1)\·\mathrm{PL},\mathrm{forM}\≤{10}^{\frac{P_{\max }-P_0-\mathrm{\αPL}}{10}}\\ P_{\max }-\mathrm{PL}-10{\log }_{10}\left(M\right),\mathrm{forother\; cases}\end{array}\right.$

According to following formula, can be through changing bandwidth M its transmitting power of control and then the controller PSD of UE _Rx, to establish interference noise and be NI (the Noise and Interference) dBm of unit, this moment, the Signal to Interference plus Noise Ratio (SINR, Signal Interference Noise Ratio) of channel was SINR _Current=PSD _Rx-NI, the adjustment coded system (MCS, Modulation and Coding Scheme) that this SINR is corresponding is MCS _Current, by MCS _CurrentConfirm that with bandwidth M transmission block size (TBS, Transmission Block Size) is TBS _Current, in system's available bandwidth scope, adjust PSD _RxMake TBS with bandwidth M _Current, TBS _{T arg et}, TBS _MaxThe three satisfies relation:

When system's available bandwidth is sufficient:

Least member during wherein min () expression goes to gather;

When system's available bandwidth is not enough:

Max (TBS _i, i ∈ [M and PSD _RxAll combinations])≤TBS _Current≤TBS _{T arg et}

Greatest member during wherein max () expression goes to gather;

So far the transmitting power of UE and bandwidth are all definite.

Embodiment two

Present embodiment adopts system-wide to decrease compensation and P _{Δ MCS}Enable the open loop principle, can be described below step by step with reference to accompanying drawing 2 equally:

Step 201: confirm the first open Loop Power control parameter.

Present embodiment adopts system-wide to decrease compensation and P _{Δ MCS}Enable the open loop principle, thereby the transmitting power of UE can be represented as follows: P _{Tx_UE}=min (P _Max, 10log ₁₀(M)+P ₀+ PL+P _{Δ MCS});

P wherein _{Δ MCS}Concern in detail with MCS, embody the poor of coding gain between each MCS like the description P Δ MCS in the summary of the invention, corresponding fixing power offset between each MCS, can choosing wherein generally speaking, any one MCS (is designated as MCS as basic MCS _Basic) and it is set

The P of all the other MCS _{Δ MCS}Get with respect to MCS _BasicThe coding gain difference gets final product (like MCS _xRelative MCS _BasicCoding gain is P _GainDB, then MCS _x

);

Below provide P ₀Deterministic process is provided with above-mentioned open Loop Power control parameter according to aims of systems IOT, maximum target SINR and minimum target SINR, and note target IOT is IOT _{T arg et}, maximum target SINR is SINR _{T arg et_Max}, minimum target SINR is SINR _{T arg et_M in}, SINR wherein _{Max_T arg et}The highest MCS (is designated as MCS according to the sub-district _Center) demodulation SINR is given, SINR _{T arg et_M in}MCS (is designated as MCS according to the cell edge target _Edge) demodulation SINR is given, IOT _{T arg et}For the networking parameter is provided by the network planning;

IOT _{T arg et}, SINR _{T arg et_Max}, SINR _{T arg et_Min}, P ₀, PL, between relation represent as follows:

$\left\{\begin{array}{c}{\mathrm{PSD}}_{\mathrm{Tx}}-\mathrm{PL}=\mathrm{SINR}+{\mathrm{IOT}}_{T\arg \mathrm{et}}+\mathrm{Noise}\\ {\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Max}}\≤\mathrm{SINR}\≤{\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Min}}\end{array}\right.,$

Wherein

PSD _TxBe the transmitting power on the transmit power spectral density representation unit bandwidth, Noise is that constant is represented white Gaussian noise, will contain a substitution of outer loop parameter;

Then: $\left\{\begin{array}{c}\mathrm{SINR}=P_0+P_{\mathrm{\Δ\; MCS}}-{\mathrm{IOT}}_{T\mathrm{Arg}\mathrm{Et}}-\mathrm{Noise}\\ {\mathrm{SINR}}_{T\mathrm{Arg}\mathrm{Et}\_\mathrm{Max}}\≤\mathrm{SINR}\≤{\mathrm{SINR}}_{T\mathrm{Arg}\mathrm{Et}\_\mathrm{Min}}\end{array}\right.,$

MCS _MaxTarget demodulation SINR is SINR _{T arg et_Max}Corresponding power offset does MCS _BasicTarget demodulation SINR is SINR _{T arg et_basic}Corresponding power offset does

MCS _MinTarget demodulation SINR is SINR _{T arg et_Min}Corresponding power offset does

Then:

$\left\{\begin{array}{c}{\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Max}}=P_0+P_{\mathrm{\Δ}{\mathrm{MCS}}_{\mathrm{Max}}}-{\mathrm{IOT}}_{T\arg \mathrm{et}}-\mathrm{Noise}\\ {\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{basic}}=P_0-{\mathrm{IOT}}_{T\arg \mathrm{et}}-\mathrm{Noise}\\ {\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Min}}=P_0+P_{\mathrm{\Δ}\mathrm{MC}{S}_{\mathrm{Min}}}-{\mathrm{IOT}}_{T\arg \mathrm{et}}-\mathrm{Noise}\end{array}\right.\⇔{\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{basic}}=P_0-{\mathrm{IOT}}_{T\arg \mathrm{et}}-\mathrm{Noise}$

That is P, ₀=SINR _{T arg et_basic}+ IOT _{T arg et}+ Noise

Step 202: obtain target received power spectrum density and this transmission demand.

Obtain the desired value and the maximum of this transmission of current scheduling UE, be designated as TBS respectively _{T arg et}And TBS _Max, and TBS _{T arg et}≤TBS _Max

Can be according to P _Max, P ₀, α, PL and M obtain the target received power spectrum density of UE.

Step 203: according to relation, the TBS between UE transmitted bandwidth and the target received power spectrum density _{T arg et}, TBS _MaxAnd the transmitted bandwidth M of QoS parameter adjustment UE.

The open loop Control Parameter is the maximal received power spectrum density PSD of given UE only _Rx, PSD under the prerequisite that in fact PL and MCS are fixing _RxAlso with monotone decreasing, the physical relationship formula is described below with bandwidth M:

${\mathrm{PSD}}_{\mathrm{Rx}}=\left\{\begin{array}{c}{P}_0+P_{\mathrm{\ΔMCS}},\mathrm{forM}\≤{10}^{\frac{P_{\max }-P_0-\mathrm{PL}-P_{\mathrm{\ΔMCS}}}{10}}\\ P_{\max }-\mathrm{PL}-10{\log }_{10}\left(M\right),\mathrm{forother\; cases}\end{array}\right.$

According to following formula, can be through changing bandwidth M its transmitting power of control and then the controller PSD of UE _Rx, to establish interference noise and be NI (the Noise and Interference) dBm of unit, this moment, the Signal to Interference plus Noise Ratio (SINR, Signal Interference Noise Ratio) of channel was SINR _Current=PSD _Rx-NI, the adjustment coded system (MCS, Modulation and Coding Scheme) that this SINR is corresponding is MCS _Current, by MCS _CurrentConfirm that with bandwidth M transmission block size (TBS, Transmission Block Size) is TBS _Current, in system's available bandwidth scope, adjust PSD _RxMake TBS with bandwidth M _Current, TBS _{T arg et}, TBS _MaxThe three satisfies relation:

When system's available bandwidth is sufficient:

Least member during wherein min () expression goes to gather;

When system's available bandwidth is not enough:

Max (TBS _i, i ∈ [M and PSD _RxAll combinations])≤TBS _Current≤TBS _{T arg et}

Greatest member during wherein max () expression goes to gather;

So far the transmitting power of UE and bandwidth are all definite.

Referring to shown in Figure 3, a kind of open Loop Power control system that the embodiment of the invention provides, comprising: first power contorl parameters is confirmed unit 31, parameter acquiring unit 32, bandwidth adjustment unit 33 and power control unit 34.

First power contorl parameters is confirmed unit 31; Be used for first power contorl parameters being set according to aims of systems IOT and target SINR; Wherein, Under the situation that the modulation coding mode power offset of UE does not enable; Said first power contorl parameters comprises nominal target received power spectrum density and the path loss compensating factor of UE, and under the situation that the modulation coding mode power offset of UE enables, said first power contorl parameters comprises the modulation coding mode power offset of nominal target received power spectrum density, path loss compensating factor and the UE of UE.

Note target IOT is IOT _{T arg et}, maximum target SINR is SINR _{T arg et_Max}, minimum target SINR is SINR _{T arg et_M in}, SINR wherein _{Max_T arg et}The highest MCS (is designated as MCS according to the sub-district _Center) demodulation SINR is given, SINR _{T arg et_Min}MCS (is designated as MCS according to the cell edge target _Edge) demodulation SINR is given, IOT _{T arg et}For the networking parameter is provided by the network planning;

IOT _{T arg et}, SINR _{T arg et_Max}, SINR _{T arg et_Min}, P ₀, α, PL, between relation represent as follows:

$\left\{\begin{array}{c}{\mathrm{PSD}}_{\mathrm{Tx}}-\mathrm{PL}=\mathrm{SINR}+{\mathrm{IOT}}_{T\arg \mathrm{et}}+\mathrm{Noise}\\ {\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Max}}\≤\mathrm{SINR}\≤{\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Min}}\end{array}\right.,$

Wherein

PSD _TxBe the transmitting power on the transmit power spectral density representation unit bandwidth, Noise is that constant is represented white Gaussian noise, will contain a substitution of outer loop parameter;

Then: $\left\{\begin{array}{c}\mathrm{SINR}=P_0+\mathrm{\α}\·\mathrm{PL}[+P_{\mathrm{\Δ\; MCS}}]-\mathrm{PL}-{\mathrm{IOT}}_{T\mathrm{Arg}\mathrm{Et}}-\mathrm{Noise}\\ {\mathrm{SINR}}_{T\mathrm{Arg}\mathrm{Et}\_\mathrm{Max}}\≤\mathrm{SINR}\≤{\mathrm{SINR}}_{T\mathrm{Arg}\mathrm{Et}\_\mathrm{Min}}\end{array}\right.,$

For center of housing estate UE, its path loss is less, and target SINR gets maximum SINR _{T arg et_Max}, establishing at this moment, path loss is PL _NearFor cell edge UE, its path loss is bigger, and target SINR gets minimum value SINR _{T arg et_Min}, design path loss this moment is PL _Far, then:

$\left\{\begin{array}{c}{\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Max}}=P_0+\mathrm{\α}\·{\mathrm{PL}}_{\mathrm{near}}[+P_{\mathrm{\ΔMCS}}]-{\mathrm{PL}}_{\mathrm{near}}-{\mathrm{IOT}}_{T\arg \mathrm{et}}-\mathrm{Noise}\\ {\mathrm{SINR}}_{T\arg \mathrm{et}\_\mathrm{Min}}=P_0+\mathrm{\α}\·{\mathrm{PL}}_{\mathrm{near}}[+P_{\mathrm{\ΔMCS}}]-{\mathrm{PL}}_{\mathrm{near}}-{\mathrm{IOT}}_{T\arg \mathrm{et}}-\mathrm{Noise}\end{array}\right.$

Can confirm P fully thus ₀Value with α.If P _{Δ MCS}Enable, then the target SINR of UE is because P ₀, α, PL and MCS confirm jointly, promptly change, if the target SINR that does not enable UE then is fully owing to P with MCS ₀, α and PL confirm.

Parameter acquiring unit 32 is used to obtain target received power spectrum density and this transmission demand of UE of UE.

Said parameter acquiring unit is confirmed the target received power spectrum density according to following formula:

${\mathrm{PSD}}_{\mathrm{Rx}}=\left\{\begin{array}{c}{P}_0+(\mathrm{\α}-1)\·\mathrm{PL}[+P_{\mathrm{\Δ\; MCS}}],\mathrm{ForM}\≤{10}^{\frac{P_{\mathrm{Max}}-P_0-\mathrm{\α\; PL}[-P_{\mathrm{\Δ\; MCS}}]}{10}}\\ P_{\mathrm{Max}}-\mathrm{PL}-10{\mathrm{Log}}_{10}\left(M\right),\mathrm{Else}\end{array}\right.,$ Wherein,

PSD _RXBe the target received power spectrum density,

Target is accepted power spectral density PSD _Rx=P ₀+ (α-1) PL [+P _{Δ MCS}] then: P _{Δ MCS}When not enabling, the open loop parameter is in a single day given, and the maximal received power spectrum density of UE will increase and monotone decreasing with PL; P _{Δ MCS}When enabling, fixedly for the MCS, the open loop parameter is in a single day given for certain, and the maximal received power spectrum density of UE will increase and monotone decreasing with PL;

The above open loop parameter is the maximal received power spectrum density PSD of given UE only _Rx, PSD under the prerequisite that in fact PL and MCS are fixing _RxAlso with monotone decreasing, the physical relationship formula is described below with bandwidth M:

${\mathrm{PSD}}_{\mathrm{Rx}}=\left\{\begin{array}{c}{P}_0+(\mathrm{\α}-1)\·\mathrm{PL}[+P_{\mathrm{\ΔMCS}}],\mathrm{forM}\≤{10}^{\frac{P_{\max }-P_0-\mathrm{\αPL}[-P_{\mathrm{\ΔMCS}}]}{10}}\\ P_{\max }-\mathrm{PL}-10{\log }_{10}\left(M\right),\mathrm{forother\; cases}\end{array}\right.$

Bandwidth adjustment unit 33 is used for target received power spectrum density and this transmission demand of UE according to the UE that obtains, the transmitted bandwidth of adjustment UE.

According to following formula, can be through changing bandwidth M its transmitting power of control and then the controller PSD of UE _Rx, to establish interference noise and be NI (the Noise and Interference) dBm of unit, this moment, the Signal to Interference plus Noise Ratio (SINR, Signal Interference Noise Ratio) of channel was SINR _Current=PSD _Rx-NI, the adjustment coded system (MCS, Modulation and Coding Scheme) that this SINR is corresponding is MCS _Current, by MCS _CurrentConfirm that with bandwidth M transmission block size (TBS, Transmission Block Size) is TBS _Current, in system's available bandwidth scope, adjust PSD _RxMake TBS with bandwidth M _Current, TBS _{T arg et}, TBS _MaxThe three satisfies relation:

When system's available bandwidth is sufficient:

Least member during wherein min () expression goes to gather;

When system's available bandwidth is not enough:

Max (TBS _i, i ∈ [M and PSD _RxAll combinations])≤TBS _Current≤TBS _{T arg et}

Greatest member during wherein max () expression goes to gather;

So far the transmitting power of UE and bandwidth are all definite.

Power control unit 34 is used to utilize the transmitted bandwidth of said first power contorl parameters and said UE, the transmitting power of adjustment UE.

Said power control unit is adjusted the transmitting power of UE according to following formula:

P _{Tx_UE}=min (P _Max, 10log ₁₀(M)+P ₀+ α PL [+P _{Δ MCS}]), wherein [] expression is optional

In view of in the prior art, closed loop power control algorithm is owing to complex design and need extra control signaling UE to change power.Conventional open Loop Power control algorithm; Owing to do not notify the control signalling path of the change power of UE; Cause the base station can't control the transmitted power of UE effectively, thereby make the received power of presence of intercell interference and UE can not get better controlling, influence systematic function.The present invention program can effectively control the transmitting power of UE; Need not to increase extra control signaling UE again and change power; And realize simply, under the prerequisite of not introducing closed power control, both guaranteed the controlled of interference; The power variable that has guaranteed UE again is controlled, helps to realize balance between UE throughput and the throughput of system.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.

Claims (8)

1. an open-loop power control method is characterized in that, this method may further comprise the steps:

Ratio I OT and echo signal interference-to-noise ratio SINR according to aims of systems interference noise sum and noise are provided with first power contorl parameters; Wherein, Under the situation that the modulation coding mode power offset of user equipment (UE) does not enable; Said first power contorl parameters comprises nominal target received power spectrum density and the path loss compensating factor of UE; Under the situation that the modulation coding mode power offset of UE enables, said first power contorl parameters comprises the modulation coding mode power offset of nominal target received power spectrum density, path loss compensating factor and the UE of UE; And

According to the target received power spectrum density of the UE that obtains and the transmitted bandwidth of this transmission demand adjustment of UE UE;

Utilize the transmitted bandwidth of said first power contorl parameters and said UE, the transmitting power of adjustment UE.

2. method according to claim 1 is characterized in that, under the situation that the modulation coding mode power offset of UE does not enable, then target SINR, aims of systems IOT and the PL according to UE confirms P ₀, α; Under the situation that the coded system power offset of UE enables, then target SINR, aims of systems IOT and the PL according to UE confirms P ₀, α and P _{Δ MCS}, wherein,

P ₀Be the nominal target received power spectrum density of UE, unit is dBm;

α is the path loss compensating factor, α ∈ [0,1];

PL is the radio propagation path loss that the terminal measures, and unit is dB;

P _{Δ MCS}Modulation coding mode power offset for UE.

3. method according to claim 1 is characterized in that, according to P _Max, P ₀, α, PL and M obtain the target received power spectrum density of UE;

Concrete according to following formula acquisition:

${\mathrm{PSD}}_{\mathrm{Rx}}=\left\{\begin{array}{c}{P}_0+(\mathrm{\α}-1)\·\mathrm{PL}[+P_{\mathrm{\Δ\; MCS}}],\mathrm{ForM}\≤{10}^{\frac{P_{\mathrm{Max}}-P_0-\mathrm{\α\; PL}[-P_{\mathrm{\Δ\; MCS}}]}{10}}\\ P_{\mathrm{Max}}-\mathrm{PL}-10{\mathrm{Log}}_{10}\left(M\right),\mathrm{Else}\end{array}\right.,$ Wherein,

PSD _RXBe the target received power spectrum density,

P _MaxBe the UE maximum transmission power, the dBm of unit;

P ₀Nominal target received power spectrum density for UE;

α is the path loss compensating factor, α ∈ [0,1];

PL is the radio propagation path loss that the terminal measures, and unit is dB;

M is a bandwidth resources number of distributing to UE.

4. method according to claim 1 is characterized in that, adjusts the transmitting power of UE according to following formula:

P _{Tx_UE}=min (P _Max, 10log ₁₀(M)+P ₀+ α PL [+P _{Δ MCS}]), wherein [] expression is optional, wherein,

P _MaxBe the UE maximum transmission power, unit is dBm;

M be UE divide the bandwidth resources number;

P ₀Be the nominal target received power spectrum density of UE, unit is dBm;

α is the path loss compensating factor, α ∈ [0,1];

PL is the radio propagation path loss that UE measures, and is called for short path loss, and unit is dB;

P _{Δ MCS}Be the modulation coding mode power offset of UE, unit is dB.

5. an open Loop Power control system is characterized in that, comprising:

First power contorl parameters is confirmed the unit; Be used for first power contorl parameters being set according to aims of systems IOT and target SINR; Wherein, Under the situation that the modulation coding mode power offset of UE does not enable; Said first power contorl parameters comprises nominal target received power spectrum density and the path loss compensating factor of UE, and under the situation that the modulation coding mode power offset of UE enables, said first power contorl parameters comprises the modulation coding mode power offset of nominal target received power spectrum density, path loss compensating factor and the UE of UE;

Parameter acquiring unit is used to obtain target received power spectrum density and this transmission demand of UE of UE;

The bandwidth adjustment unit is used for according to the target received power spectrum density of the UE that obtains and the transmitted bandwidth of this transmission demand adjustment of UE UE;

Power control unit is used to utilize the transmitted bandwidth of said first power contorl parameters and said UE, the transmitting power of adjustment UE.

6. system according to claim 5 is characterized in that, said first power contorl parameters is confirmed the unit, is used under the situation that the modulation coding mode power offset at UE do not enable, and then target SINR, aims of systems IOT and the PL according to UE confirms P ₀, α; Under the situation that the coded system power offset of UE enables, then target SINR, aims of systems IOT and the PL according to UE confirms P ₀, α and P _{Δ MCS},

Wherein, P ₀Be the nominal target received power spectrum density of UE, unit is dBm;

α is the path loss compensating factor, α ∈ [0,1];

PL is the radio propagation path loss that the terminal measures, and unit is dB;

P _{Δ MCS}Modulation coding mode power offset for UE.

7. system according to claim 5 is characterized in that said parameter acquiring unit is according to P _Max, P ₀, α, PL and M obtain the target received power spectrum density of UE.

Concrete according to following formula acquisition:

${\mathrm{PSD}}_{\mathrm{Rx}}=\left\{\begin{array}{c}{P}_0+(\mathrm{\α}-1)\·\mathrm{PL}[+P_{\mathrm{\Δ\; MCS}}],\mathrm{ForM}\≤{10}^{\frac{P_{\mathrm{Max}}-P_0-\mathrm{\α\; PL}[-P_{\mathrm{\Δ\; MCS}}]}{10}}\\ P_{\mathrm{Max}}-\mathrm{PL}-10{\mathrm{Log}}_{10}\left(M\right),\mathrm{Else}\end{array}\right.,$ Wherein,

PSD _RXBe the target received power spectrum density,

P _MaxBe the UE maximum transmission power, the dBm of unit;

P ₀Nominal target received power spectrum density for UE;

α is the path loss compensating factor, α ∈ [0,1];

PL is the radio propagation path loss that the terminal measures, and unit is dB;

M is a bandwidth resources number of distributing to UE.

8. system according to claim 5 is characterized in that, said power control unit is adjusted the transmitting power of UE according to following formula:

P _{Tx_UE}=min (P _Max, 10log ₁₀(M)+P ₀+ α PL [+P _{Δ MCS}]), wherein [] expression is optional, wherein,

P _MaxBe the UE maximum transmission power, unit is dBm;

M be UE divide the bandwidth resources number;

P ₀Be the nominal target received power spectrum density of UE, P ₀=P _{0_Cell}+ P _{0_UE}, P wherein _{0_Cell}Be cell-level, received power spectrum density, P _{0_UE}Be UE received power spectrum density side-play amount, value is relevant with the IOT of system with target SINR, the dBm of unit;

α is the path loss compensating factor, α ∈ [0,1];

PL is the radio propagation path loss that UE measures, and is called for short path loss, and unit is dB;

P _{Λ MCS}Be the modulation coding mode power offset of UE, unit is dB.

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