CN101312367B

CN101312367B - Method and apparatus for controlling transmission power during downlink interrupted transmission

Info

Publication number: CN101312367B
Application number: CN2007101076402A
Authority: CN
Inventors: 魏立梅; 佟学俭
Original assignee: TD Tech Ltd
Current assignee: TD Tech Ltd
Priority date: 2007-05-23
Filing date: 2007-05-23
Publication date: 2012-05-02
Anticipated expiration: 2027-05-23
Also published as: CN101312367A

Abstract

The invention discloses a method for controlling transmission power during downlink discontinuous transmission, comprising steps of calculating the transmission power of a user equipment UE at each subframe, then calculating uplink link-loss value of each subframe according to a base station NodeB to the received power and the transmission power of the UE, further calculating, according to the uplink link-loss value, link-loss increment from a former special burst to a current special burst when adjusting transmission power of special bursts during the downlink discontinuous transmission, and adjusting the transmission power of the former special burst according to the link-loss increment to obtain the transmission power of the current special burst. The invention further discloses a device for controlling the transmission power during the downlink discontinuous transmission. By utilizing the method and the device, no matter the uplink link-loss is increased or decreased, the link-loss increment can be obtained dynamically, thereby dynamically adjusting the transmission power of the special bursts.

Description

Method and apparatus for controlling transmission power during downlink discontinuous transmission

Technical Field

The present invention relates to the technical field of controlling transmission power in third generation mobile communication systems, and in particular, to a method and apparatus for controlling transmission power during downlink discontinuous transmission in a third generation mobile communication system.

Background

In a mobile communication system, in order to reduce interference between radio channels and reduce the operation load and power consumption of a base station, a base station (NodeB) and a User Equipment (UE) often communicate using a Downlink Discontinuous Transmission (DTX) method. The downlink DTX means: a procedure in which the NodeB does not transmit a signal to the UE during traffic (voice transmission/data transmission) intermittence during communication (including voice call and data communication) with the UE.

When the NodeB and the UE are in a Downlink DTX communication mode, if the NodeB does not transmit a signal to the UE in a Downlink Dedicated Physical Channel (DL DPCH), the NodeB periodically transmits a Special Burst (SB, Special Burst) to the UE through the DL DPCH. According to the regulations of the third generation partnership project (3GPP) organization, when the NodeB does not transmit a signal to the UE, it ignores the downlink power control command returned by the UE and stops the control of the downlink transmission power. Then, how does the NodeB control the downlink transmit power of a special burst when it is not transmitting a signal to the UE?

At present, after the NodeB enters DTX, a fixed value is used as a downlink power transmission value during the whole DTX period, where the fixed value is P — TSCP + PowerMargin _ DLDTX.

Wherein, P is the downlink transmission power during the whole DTX period, TSCP is the power value measured last before the NodeB enters DTX, PowerMargin _ DLDTX is a fixed power increment, and its function is mainly to compensate the path loss generated during the UE moving process. The method for compensating the path loss generated by the UE movement by adopting the fixed power increment PowerMargin _ DLDTX has the defects that:

when the UE approaches to the NodeB, the path loss is smaller and smaller, and at the moment, a fixed power increment is adopted to perform relatively large power compensation, so that the power of the NodeB is wasted, and unnecessary interference is generated on other UE.

When the UE is far from the NodeB, the path loss will be larger and larger, and at this time, a fixed power increment is still used to perform relatively small power compensation, which may not meet the requirement of path loss compensation, resulting in a decrease in the reception quality of the UE.

Disclosure of Invention

In view of this, the technical problem to be solved by the present invention is to provide a method and an apparatus for controlling transmission power during downlink discontinuous transmission, so as to solve the disadvantage of compensating for UE path loss by using a fixed power increment during downlink DTX.

Therefore, the technical scheme provided by the invention is as follows:

a method of controlling transmission power during downlink discontinuous transmission, comprising:

calculating the transmission power of User Equipment (UE) in each subframe, and calculating an uplink path loss value of each subframe according to the receiving power of a base station NodeB to the UE and the transmission power of the UE;

when the sending power of the special burst is adjusted during the discontinuous downlink sending period, calculating the path loss increment from the previous special burst to the current special burst according to the uplink path loss value;

and adjusting the sending power of the previous special burst according to the path loss increment to obtain the sending power of the current special burst.

Wherein, the transmission power of the UE is calculated according to the following steps:

in the first subframe of the UE sending information to NodeB, a preset value X is used_TXP(0) As the transmit power of the UE;

in other sub-frames where the UE sends information to the NodeB, X is calculated_TXP(n)＝X_TXP(n-1)·ΔP_nObtaining the transmission power X of the current subframe UE_TXP(n)；

Where n is the subframe number of the current subframe, n-1 is the subframe number of the previous subframe, X_TXP(n-1) represents the transmission power, Δ P, of the UE of the previous subframe_nIs the increment of UE transmit power from the previous subframe to the current subframe.

Wherein, in each sub-frame, a calculation is made

X_{PL} (n) = \frac{X_{TXP} (n)}{X_{RXP} (n)},

With X_PL(n) as the uplink loss value of the current subframe;

where n is the current subframeSubframe number, X_RXP(n) is the received power of the current subframe NodeB.

Wherein, when the transmission power of the special burst is adjusted during the downlink discontinuous transmission period, the special burst is calculated

<math> <mrow> <mi>PathLossIncrement</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>′</mo> <mo>-</mo> <mi>delay</mi> <mo>)</mo> </mrow> </mrow> <mrow> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>m</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>,</mo> </mrow></math>

Obtaining the path loss increment PathLossIncrement from the previous special burst to the current special burst;

wherein n' is the subframe number of the first subframe of the current special burst, delay is the minimum processing delay in subframe units required for calculating the uplink path loss value, and X_PL(n '-delay) is the uplink loss value of the subframe (n' -delay), m is the subframe number of the first subframe of the previous special burst, X_PL(m) is the uplink loss value of the first subframe of the previous special burst.

Wherein the calculation is performed every sub-frame

X_{PL} (n) = \frac{X_{TXP} (n)}{X_{RXP} (n)};

In the first subframe in which the UE sends information to the NodeB, X_PL(n) as the uplink loss value of the current subframe;

calculating the smooth value of the uplink loss of the current sub-frame in other sub-frames of the information sent to NodeB by UE

<math> <mrow> <mi></mi> <mover> <mrow> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mi>p</mi> <mo>·</mo> <mover> <mrow> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> <mo>&OverBar;</mo> </mover> <mo>+</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mi>p</mi> <mo>)</mo> </mrow> <mo>·</mo> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>,</mo> </mrow></math>

With uplink path loss smoothing value

As the uplink loss value of the current subframe;

where n is the subframe number of the current subframe, X_RXP(n) is the received power of NodeB for the UE in the current subframe, n-1 is the subframe number of the previous subframe,

is the uplink loss smoothing value of the previous subframe, and p is the value range [0, 1 ]]The forgetting factor of (c).

Wherein the transmission power of the special burst is adjusted by calculation during the downlink discontinuous transmission

<math> <mrow> <mi>PathLossIncrement</mi> <mo>=</mo> <mfrac> <mover> <mrow> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>′</mo> <mo>-</mo> <mi>delay</mi> <mo>′</mo> <mo>′</mo> <mo>)</mo> </mrow> </mrow> <mo>&OverBar;</mo> </mover> <mover> <mrow> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>m</mi> <mo>)</mo> </mrow> </mrow> <mo>&OverBar;</mo> </mover> </mfrac> <mo>,</mo> </mrow></math>

wherein n' is the subframe number of the first subframe of the current special burst, delay "is the minimum processing delay required for calculating the uplink loss value,

is the uplink loss smoothing value of the sub-frame (n' -delay "), m is the sub-frame number of the first sub-frame of the previous special burst,

is the uplink loss smoothing value of the first subframe of the previous special burst.

Adjusting the transmission power PowerSB (m) of the previous special burst by calculating PowerSB (n ') ═ PowerSB (m) multiplied by PathLossIncrement, and obtaining the transmission power PowerSB (n') of the current special burst;

where n' is the subframe number of the first subframe of the current special burst, m is the subframe number of the first subframe of the previous special burst, and pathloss increment is the path loss increment from the previous special burst to the current special burst.

Wherein, the transmission power of the first sub-frame of the special burst is used as the transmission power of the special burst.

The invention provides another method for controlling transmission power during downlink discontinuous transmission, which comprises the following steps:

recording the transmission power increment of the UE in each subframe;

when the sending power of the special burst is adjusted during the discontinuous downlink sending period, calculating the total sending power increment from the previous special burst to the current special burst of the UE according to the sending power increment;

and adjusting the transmission power of the previous special burst according to the total increment of the transmission power to obtain the transmission power of the current special burst.

Wherein, in each subframe, the transmission power increment of the UE in each subframe is recorded according to the following steps:

if NodeB stops sending information to UE in the current sub-frame, NodeB will

Recording as a first preset value; if not, then,

uplink power control command PC generated at NodeB_ulWhen (n-delay') is 11, willThe second preset value is recorded as the second preset value,

uplink power control command PC generated at NodeB_ulWhen (n-delay') is 00, will

Recording as a third preset value;

wherein n is the subframe number of the current subframe, delay' is the processing delay in subframe unit required by the NodeB to generate the uplink power control command,

is a transmission power increment of the subframe (n-delay') UE.

Wherein, when the transmission power of the special burst is adjusted during the downlink discontinuous transmission,

at NodeB when sending the second special burst, through calculation

<math> <mrow> <mi>PowerIncrement</mi> <mo>=</mo> <msup> <mn>10</mn> <mrow> <mfrac> <mrow> <msub> <mi>P</mi> <mrow> <mi>step</mi> <mo>_</mo> <mi>ul</mi> </mrow> </msub> <mo>·</mo> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mi>m</mi> </mrow> <mrow> <mi>n</mi> <mo>′</mo> <mo>-</mo> <mi>delay</mi> <mo>′</mo> </mrow> </munderover> <msubsup> <mi>PC</mi> <mi>ul</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> <mn>10</mn> </mfrac> <mo>,</mo> </mrow> </msup> </mrow></math>

Obtaining a total transmission power increment Powerincrement from a previous special burst to a current special burst of the UE;

starting from the third special burst by calculation

<math> <mrow> <mi>PowerIncrement</mi> <mo>=</mo> <msup> <mn>10</mn> <mrow> <mfrac> <mrow> <msub> <mi>P</mi> <mrow> <mi>step</mi> <mo>_</mo> <mi>ul</mi> </mrow> </msub> <mo>·</mo> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mi>m</mi> <mo>+</mo> <mn>1</mn> <mo>-</mo> <mi>delay</mi> <mo>′</mo> </mrow> <mrow> <mi>n</mi> <mo>′</mo> <mo>-</mo> <mi>delay</mi> <mo>′</mo> </mrow> </munderover> <msubsup> <mi>PC</mi> <mi>ul</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> <mn>10</mn> </mfrac> <mo>,</mo> </mrow> </msup> </mrow></math>

wherein delay' is the processing time delay in sub-frame unit required by the NodeB to generate the uplink power control command,

is the transmit power increment of subframe nUE, n' is the subframe number of the first subframe of the current special burst, m is the subframe number of the first subframe of the previous special burst, P_{step_ul}Is a preset power adjustment step size.

Adjusting the transmission power PowerSB (m) of the previous special burst by calculating PowerSB (n ') ═ PowerSB (m) multiplied by PowerIncrement, and obtaining the transmission power PowerSB (n');

The invention provides a device for controlling transmission power during downlink discontinuous transmission based on the method, which comprises:

a transmission power unit, configured to calculate a transmission power of the UE in each subframe;

a path loss value unit, configured to calculate an uplink path loss value of each subframe according to the received power of the base station NodeB to the UE and the transmission power of the UE;

a path loss increment unit, configured to calculate a path loss increment from a previous special burst to a current special burst according to an uplink path loss value obtained by the path loss value unit when the transmission power of the special burst is adjusted during downlink discontinuous transmission;

and the adjusting unit is used for adjusting the sending power of the previous special burst according to the path loss increment obtained by the path loss increment unit to obtain the sending power of the current special burst.

Wherein the transmission power unit includes:

a first power unit, configured to send information to the NodeB in a first subframe of the UE, where the first subframe is a preset value X_TXP(0) As the transmit power of the UE;

other power unit for calculating X in other sub-frames in which the UE sends information to the NodeB_TXP(n)＝X_TXP(n-1)·ΔP_nObtaining the transmission power X of the current subframe UE_TXP(n)；

Wherein the path loss value unit is used for calculating in each subframe

X_{PL} (n) = \frac{X_{TXP} (n)}{X_{RXP} (n)},

With X_PL(n) as the uplink loss value of the current subframe;

where n is the subframe number of the current subframe, X_RXP(n) is the received power of the current subframe NodeB.

Wherein, the path loss increment unit is used for calculating and calculating when the transmission power of the special burst is adjusted during the downlink discontinuous transmission period

Wherein the path loss value unit includes:

a first unit for calculating at each sub-frame

X_{PL} (n) = \frac{X_{TXP} (n)}{X_{RXP} (n)};

A second unit, configured to send information to the NodeB in a first subframe of the UE, X_PL(n) as the uplink loss value of the current subframe; calculating the smooth value of the uplink loss of the current sub-frame in other sub-frames of the information sent to NodeB by UE

With uplink path loss smoothing valueAs the uplink loss value of the current subframe;

is the uplink loss smoothing value of the sub-frame (n' -delay "), m is the sub-frame number of the first sub-frame of the previous special burst,is the uplink loss smoothing value of the first subframe of the previous special burst.

The adjusting unit is configured to calculate PowerSB (n ') ═ PowerSB (m) × pathloss increment, and implement adjustment on transmit power PowerSB (m) of a previous special burst to obtain transmit power PowerSB (n') of a current special burst;

Another apparatus for controlling transmission power during discontinuous downlink transmission according to the present invention includes:

a power increment recording unit, configured to record a transmit power increment of the UE in each subframe;

a total increment calculating unit, configured to calculate, when the transmission power of the special burst is adjusted during downlink discontinuous transmission, a total increment of the transmission power from a previous special burst to a current special burst of the UE according to the transmission power increment obtained by the power increment recording unit;

and the adjusting unit is used for adjusting the sending power of the previous special burst according to the sending power total increment obtained by the total increment calculating unit to obtain the sending power of the current special burst.

Wherein the power increment recording unit includes:

a judging unit, configured to judge whether a NodeB stops sending information to a UE in a current subframe;

a recording unit for stopping transmitting information to the UE by the NodeB in the current sub-frame

Recording as a first preset value; when NodeB sends information to UE in current sub-frame, if NodeB generates up power control command PC_ul(n-delay') is 11, then

Recording as the second preset value, if the uplink power control command generated by NodeBPC_ul(n-delay') is 00, then

Recording as a third preset value;

is a transmission power increment of the subframe (n-delay') UE.

Wherein the total increment calculation unit includes:

a second special burst unit for calculating when the NodeB sends a second special burst

other special burst unitsFor starting from the third special burst by calculation

where m is the subframe number of the first subframe of the previous special burst, n' is the subframe number of the first subframe of the current special burst, P_{step_ul}Is a preset power adjustment step size.

The adjusting unit is configured to calculate PowerSB (n ') ═ PowerSB (m) × PowerIncrement, and implement adjustment on transmission power PowerSB (m) of a previous special burst to obtain transmission power PowerSB (n') of a current special burst;

It can be seen that, by using the method and apparatus provided by the present invention, no matter the UE is close to the NodeB or far from the NodeB, no matter the uplink loss value of the UE is increased or decreased, the path loss increment can be dynamically obtained according to the path loss condition of the UE, so that the special burst transmission power can be dynamically adjusted. The method provided by the invention can solve the defect that the path loss of the UE is compensated by adopting the fixed power increment during the downlink DTX.

Drawings

Fig. 1 is a diagram illustrating a NodeB transmitting a special burst in a downlink DTX mode;

FIG. 2 is a flow chart of example 1 of the method of the present invention;

FIG. 3 is a flow chart of method embodiment 2 of the present invention;

FIG. 4 is a flow chart of method embodiment 3 of the present invention;

FIG. 5 is a schematic view of an embodiment of the apparatus of the present invention;

fig. 6 is a schematic view of another embodiment of the apparatus of the present invention.

Detailed Description

When the NodeB communicates with the UE in a downlink DTX mode, when the NodeB does not transmit a signal to the UE, the NodeB will periodically transmit a special burst to the UE, and fig. 1 is a schematic diagram of the NodeB transmitting a special burst.

The transmission of the special burst by the NodeB is in units of frames, and the special burst shown in fig. 1 has a duration of 1 frame and a transmission period of 2 subframes. Wherein 1 frame includes 2 subframes.

The core of the invention is that NodeB calculates the uplink loss value of the UE in each subframe according to the receiving power of the NodeB to the UE and the sending power of the UE in each subframe; when the special burst is sent to the UE, the NodeB takes the uplink path loss value of the first subframe of each previous special burst of the UE as the path loss value of the UE in the special burst, and obtains the path loss value increment according to the path loss value of the UE in the current special burst and the path loss value of the previous special burst; then, the NodeB adjusts the sending power of the previous special burst according to the path loss value increment to obtain the sending power of the current special burst.

In order to implement the method provided by the present invention, in uplink DPCH, the UE cannot communicate with the NodeB in an uplink DTX mode. If the UE communicates with the NodeB in an uplink DTX manner, the NodeB cannot know the transmission power of the UE in each subframe, and thus cannot obtain an uplink path loss value of the UE, and cannot adjust the transmission power of the special burst according to the uplink path loss value.

The process is described in further detail below with reference to example 1, and FIG. 2 is a flow chart of an example of the process of the present invention.

In step 201, in each subframe, the NodeB obtains the transmit power of the UE in the current subframe according to the transmit power of the UE in the previous subframe and the uplink power control command sent by the NodeB.

NodeB calculates X_TXP(n)＝X_TXP(n-1)·ΔP_nThe transmission power X of the current subframe UE can be obtained_TXP(n), n is the subframe number of the current subframe, X_TXP(n-1) represents the transmission power, Δ P, of the UE of the previous subframe_nIs the power adjustment increment indicated by the (n-D) th subframe uplink power control command generated by the NodeB.

Wherein,

d is the loop delay of the uplink power control in sub-frame units, P_{step_ul}Is a preset power adjustment step length, is configured to the UE by the RNC,

{PC}_{ul}^{*} (n) = \{\begin{matrix} 1, & {PC}_{ul} (n) = 11 \\ - 1, & {PC}_{ul} (n) = 00 \end{matrix},

PC_uland (n) is an uplink power control command of the current subframe of the UE generated by the NodeB. According to the 3GPP standard, PC_ul(n) — 11 denotes an uplink power control command "Up", and PC_ul(n) ═ 00 denotes uplink power control command "Down”。

The power adjustment increment indicating the UE in the current subframe (subframe n) is generated according to the power control command transmitted by the NodeB in subframe (n-D).

It should be noted here that, since the NodeB transmits a signal to the UE in a downlink DTX manner, the NodeB stops transmitting any signal to the UE in some subframes, and at this time, the UE cannot obtain the uplink power control command generated by the NodeB for the subframe. In this case, it is preferable that the air conditioner,

accordingly, Δ P_nWhen 1, NodeB will consider the UE not to perform power adjustment, X_TXP(n)＝X_TXP(n-1)。

It should be noted that, when recursively calculating the transmission power of the UE in the current subframe according to the above formula, the initial value X of the recursive calculation is needed_TXP(0) I.e. the transmission power of the subframe in which the UE first transmits a signal to the NodeB. X_TXP(0) Is taken between the minimum and maximum transmit power of the UE, usually X_TXP(0) It can be taken as-55 dBm.

Obtaining the transmission power X of the current subframe UE_TXP(n) thereafter, in step 202, the NodeB receives the UE according to its received power X in the current subframe_RXP(n) and X_TXP(n) calculating that the UE is presentUplink loss value X of preceding subframe_PL(n)。

By calculation of

X_{PL} (n) = \frac{X_{TXP} (n)}{X_{RXP} (n)},

The uplink path loss value of the UE in the current subframe can be obtained.

During downlink discontinuous transmission, when the NodeB transmits a first special burst to the UE, the NodeB determines the transmission power of the first special burst in step 203, according to the existing closed-loop power control method.

It should be noted here that when the NodeB transmits the first special burst to the UE, the transmission power of the special burst does not need to be adjusted, but only needs to be determined according to the existing closed-loop power control method.

During the discontinuous downlink transmission, the NodeB adjusts the transmission power of each subsequent special burst, starting from the second special burst, and then, in step 204, the NodeB calculates and obtains the path loss value increment between two special bursts, using the uplink path loss value of the first subframe of the current special burst as the path loss value of the special burst, according to the path loss value of the current special burst and the path loss value of the previous special burst. Wherein, the path loss value of the previous special burst is still the uplink path loss value of the first subframe of the special burst.

Suppose that the subframe with frame number n is the first subframe of the current special burst, and the uplink loss value X of the subframe_PL(n) is the current special burst path loss value; frame number mThe subframe is the first subframe of the previous special burst, and the uplink loss value X of the subframe_PLAnd (m) is the path loss value of the previous special burst.

By calculation of

The increase in the path loss value between two special bursts can be obtained. Where n' is a subframe number of a first subframe of the current special burst, delay is a minimum processing delay required for calculating an uplink loss value, and delay is calculated in units of subframes, for example, delay ═ 1; x_PL(n '-delay) is an uplink loss value of the subframe (n' -delay), X_PL(m) is the uplink loss value of the first subframe of the previous special burst.

It should be noted that, due to the processing delay, in the subframe n, the NodeB cannot obtain the uplink loss value X of the subframe n_PL(n), and the uplink loss value X of the sub-frame n can be obtained only in the sub-frame (n + delay)_PL(n) of (a). In the subframe n, the NodeB may obtain the uplink loss value X of the subframe (n-delay)_PL(n-delay), so X is used in calculating the path loss increment between sub-frame n and sub-frame m_PL(n-delay) as the uplink loss value of subframe n, i.e., the current subframe.

After obtaining the path loss value increment, in step 205, the NodeB adjusts the transmit power of the previous special burst according to the path loss value increment, so as to obtain the transmit power of the current special burst.

The transmission power of the previous special burst is represented by powersb (m), the transmission power of the current special burst is represented by powersb (n), and the transmission power of the current special burst can be obtained by calculating powersb (n) ═ powersb (m) × pathlossseincrement.

More specifically, referring to fig. 1, assuming that subframe 0 is the subframe where the UE transmits a signal to the NodeB for the first time, the NodeB calculates the transmission power of the UE in each subframe, starting from subframe 0.

When NodeB receives the signal sent by the UE for the first time in the subframe 0, the transmitting power X of the UE in the subframe 0 is transmitted_TXP(0) Defaults to a preset value, assuming X_TXP(0) -55 dBm; NodeB will be according to X_TXP(0) And its received power X to the UE in subframe 0_RXP(0) Calculating

X_{PL} (0) = \frac{X_{TXP} (0)}{X_{RXP} (0)},

Obtaining an uplink path loss value X of the UE in a subframe 0_PL(0)。

When NodeB receives the signal transmitted by the UE in the subframe 1, X is calculated_TXP(1)＝X_TXP(0)·ΔP₁Obtaining the transmission power X of the UE in the subframe 1_TXP(1) (ii) a NodeB will be according to X_TXP(1) And its received power X to the UE in subframe 1_RXP(1) Calculating

X_{PL} (1) = \frac{X_{TXP} (1)}{X_{RXP} (1)},

Obtaining an uplink loss value X of the UE in a subframe 1_PL(1)。

When NodeB receives the signal sent by the UE in the subframe 2, X is calculated_TXP(2)＝X_TXP(1)·ΔP₂Obtaining the transmission power X of the UE in the subframe 2_TXP(2) (ii) a NodeB will be according to X_TXP(2) And its received power X to the UE in subframe 2_RXP(2) Calculating

X_{PL} (2) = \frac{X_{TXP} (2)}{X_{RXP} (2)},

Obtaining the uplink path loss value X of the UE in the subframe 2_PL(2)。

When the NodeB receives the signal sent by the UE in the subsequent subframe, the method will be repeated in this way, and the transmission power and the uplink loss value of the UE in each subsequent subframe are calculated, which is not repeated here.

It is assumed that subframes 4 to 13 are downlink discontinuous transmission periods, the period of the special burst is 2 frames, i.e., 4 subframes, and the duration of each special burst is 1 frame, i.e., 2 subframes.

When the NodeB starts to transmit the special burst SB1 to the UE in subframe 4, the NodeB determines the transmission power of the special burst SB1 according to the existing closed loop power control method. NodeB will be the first at SB1Uplink loss value X of one subframe, i.e. subframe 4_PL(4) As the path loss value of SB 1. Assuming that the time delay of the NodeB extracting the uplink power control command sent by the UE is 1 subframe, the transmit power PowerSB (4) used by the NodeB to send the special burst in subframe 4 is the transmit power at which the NodeB adjusts the transmit power in subframe 3 according to the uplink power control command sent by the UE that it receives in subframe 3. The transmission power PowerSB (5) used by the NodeB to transmit the special burst in subframe 5 is the transmission power at which the NodeB adjusts the transmission power in subframe 4 according to the uplink power control command it receives from the UE in subframe 4.

When the NodeB sends the special burst SB1, the NodeB calculates X in the sub-frame 4 and the sub-frame 5 respectively_TXP(4) And X_PL(4)，X_TXP(5) And X_PL(5). In subframe 6, subframe 7, the NodeB, although not sending any signal to the UE, still calculates X_TXP(6) And X_PL(6)、X_TXP(7) And X_PL(7)。

When the NodeB starts to send special burst SB2 to the UE at subframe 8, the uplink loss value X will be at the first subframe of SB2, subframe 8_PL(8) As the path loss value of SB 2. By calculation of

PathLossIncrement = \frac{X_{PL} (8 - delay)}{X_{PL} (4)},

And obtaining the path loss increment PathLossIncrement.

After the increment of the path loss value is obtained, the transmission power PowerSB (8) of the special burst SB2 can be obtained by calculating PowerSB (8) × pathlossseincrement. The NodeB transmits the special burst SB2 in subframe 8 and subframe 9 with the transmission power PowerSB (8).

When the NodeB transmits the special burst SB3, the method of adjusting the transmission power of the special burst is the same as SB2, and the description thereof will not be repeated.

It can be seen that, with the method described in the embodiment of the present invention, no matter the UE is close to the NodeB or away from the NodeB, no matter the path loss of the UE increases or decreases, a path loss increment can be dynamically obtained according to the path loss condition of the UE, so that the transmission power of a special burst can be dynamically adjusted. The method provided by the invention can solve the defect that the path loss of the UE is compensated by adopting the fixed power increment during the downlink DTX.

The invention also provides a method for controlling the transmission power of the special burst. The method adopts a recursive average mode to calculate the path loss. The path loss calculated by the ratio of the transmission power to the received power contains the fast fading component of the channel, and the path loss required by us should eliminate the fast fading component as much as possible. Recursive averaging can effectively smooth fast fading components.

The method is further described in detail below with reference to example 2, and fig. 3 is a flow chart of an example of the method of the present invention.

In step 301, in each subframe, the NodeB obtains the transmit power of the UE in the current subframe according to the transmit power of the UE in the previous subframe and the uplink power control command sent by the NodeB. Step 301 is the same as step 201 and will not be described in detail here.

Obtaining the transmission power X of the current subframe UE_TXP(n) thereafter, in step 302, the NodeB receives the UE according to its received power X in the current subframe_RXP(n) and X_TXP(n) calculating an uplink loss value X of the UE in the current subframe_PL(n) of (a). Step 302 is the same as step 202 and will not be described in detail here.

Obtaining the transmission power X of the current subframe UE_TXP(n) thereafter, in step 303, the uplink loss value X of the UE in the current subframe_PL(n) smoothing to obtain the current sub-UEUplink loss smoothing value of frame

By calculation of

<math> <mrow> <mover> <mrow> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> <mo>&OverBar;</mo> </mover> <mo>=</mo> <mrow> <mfenced open='{' close='' separators=','> <mtable> <mtr> <mtd> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>,</mo> </mtd> <mtd> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mi>p</mi> <mo>·</mo> <mover> <mrow> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> <mo>&OverBar;</mo> </mover> <mo>+</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mi>p</mi> <mo>)</mo> </mrow> <mo>·</mo> <msub> <mi>X</mi> <mi>PL</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>,</mo> </mtd> <mtd> <mi>n</mi> <mo>></mo> <mn>0</mn> </mtd> </mtr> </mtable> </mfenced> </mrow> <mo>,</mo> </mrow></math>

The smooth value of the uplink loss of the UE in the current subframe can be obtained

Wherein p is a value range [0, 1 ]]The forgetting factor of (c).

For uplink path loss value X_PLThe smoothing (n) has the advantage that the noise in the path loss estimation is smoothed, and the estimated value of the path loss is more accurate.

During downlink discontinuous transmission, when the NodeB transmits a first special burst to the UE, the NodeB determines the transmission power of the first special burst in step 304, according to the existing closed-loop power control method.

During the discontinuous downlink transmission, the NodeB adjusts the transmission power of the subsequent special bursts starting from the second special burst, at which point, in step 305, the NodeB uses the smooth value of the uplink loss of the first subframe of the current special burst

And as the path loss value of the special burst, obtaining the path loss value increment between two special bursts according to the path loss value of the current special burst and the path loss value of the previous special burst. Wherein, the path loss value of the previous special burst is still the uplink path loss smooth value of the first subframe of the special burst.

Suppose that the subframe with frame number n is the first subframe of the current special burst, and the uplink loss smoothing value of the subframe

The current path loss value of the special burst is obtained; the sub-frame with the frame number m is the first sub-frame of the previous special burst, and the smooth value of the uplink loss of the sub-frame

I.e. the path loss value of the previous special burst.

By calculation of

The increase in the path loss value between two special bursts can be obtained. Where n' is a subframe number of a first subframe of the current special burst, delay "is a minimum processing delay required by the NodeB to calculate the path loss smoothing value, and delay" is calculated in units of subframes, for example, delay ═ 1;is the uplink loss smoothing value of the sub-frame (n' -delay "),

After obtaining the path loss value increment, in step 306, the NodeB adjusts the transmit power of the previous special burst according to the path loss value increment, thereby obtaining the transmit power of the current special burst. Step 306 is the same as step 205 and will not be described in detail here.

It can be seen that, compared with the method described in embodiment 1, the method described in embodiment 2 has the advantage that the calculation result of the path loss is more accurate because the uplink path loss value of the UE is smoothed.

The method described in embodiment 1 and embodiment 2 is mainly to calculate the path loss increment and adjust the transmission power of the special burst according to the path loss increment. In practice, the change of the UE path loss may also be reflected by adjusting the UE uplink transmission power by the NodeB, and the special burst transmission power may be adjusted according to the adjustment amount of the UE uplink transmission power by the NodeB.

The method is described in further detail below with reference to example 3, and fig. 4 is a flowchart of the method.

In step 401, in each subframe, recording the increment of the transmission power of the UE in the current subframe

Wherein,

<math> <mrow> <msubsup> <mi>PC</mi> <mi>ul</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mi>delay</mi> <mo>′</mo> <mo>)</mo> </mrow> <mo>=</mo> <mfenced open='{' close='' separators=''> <mtable> <mtr> <mtd> <mn>1</mn> <mo>,</mo> </mtd> <mtd> <msub> <mi>PC</mi> <mi>ul</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mi>delay</mi> <mo>′</mo> <mo>)</mo> </mrow> <mo>=</mo> <mn>11</mn> </mtd> </mtr> <mtr> <mtd> <mo>-</mo> <mn>1</mn> <mo>,</mo> </mtd> <mtd> <msub> <mi>PC</mi> <mi>ul</mi> </msub> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mi>delay</mi> <mo>′</mo> <mo>)</mo> </mrow> <mo>=</mo> <mn>00</mn> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow></math>

n is the subframe number of the current subframe, delay 'is the processing time delay of the NodeB generating the up power control command, delay' is calculated by taking the subframe as the unit; PC (personal computer)_ul(n) is an uplink power control command generated by the NodeB for subframe n. According to the 3GPP standard, PC_ul(n-delay') indicates an uplink power control command "Up" of 11, and PC_ul(n-delay') 00 denotes an uplink power control command "Down".

It should be noted here that, since the NodeB transmits a signal to the UE in a downlink DTX manner, the NodeB stops transmitting any signal to the UE in some subframes, and at this time, the UE cannot obtain the uplink power control command generated by the NodeB for the subframe. In this case, it is considered that

<math> <mrow> <msubsup> <mi>PC</mi> <mi>ul</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>-</mo> <mi>delay</mi> <mo>′</mo> <mo>)</mo> </mrow> <mo>=</mo> <mn>0</mn> <mo>.</mo> </mrow></math>

It should be further noted that, due to the processing delay ', in the subframe n, the NodeB cannot obtain the power control command in the subframe n, but only in the subframe (n + delay'). And in subframe n, the NodeB may obtain the power control command of the UE in subframe (n-delay').

During downlink discontinuous transmission, when the NodeB transmits a first special burst to the UE, the NodeB determines the transmission power of the first special burst in step 402, according to the existing closed-loop power control method.

When the NodeB transmits a second special burst to the UE during downlink discontinuous transmission, it calculates in step 403

Obtain the total increment of transmission power PowerIncrement from subframe m to subframe (n '-delay') of the UE, and execute step 405.

During the downlink discontinuous transmission, when the NodeB starts from the third special burst and transmits the subsequent special burst to the UE, in step 404, it calculates

The total increment of transmission power from subframe (m +1) to subframe n is obtained.

In

steps

403 and 404, m is the subframe number of the first subframe of the previous special burst, n' is the subframe number of the first subframe of the current special burst, P_{step_ul}Is the power adjustment step size configured by the RNC to the UE.

After obtaining the transmit power increment of the UE between two subframes, in step 405, the NodeB adjusts the transmit power of the previous special burst according to the total transmit power increment, thereby obtaining the transmit power of the current special burst.

The transmission power of the previous special burst is represented by powersb (m), the transmission power of the current special burst is represented by powersb (n), and the transmission power of the current special burst can be obtained by calculating powersb (n) ═ powersb (m) × PowerIncrement.

More specifically, referring to fig. 1, it is assumed that a subframe 0 is a subframe where the UE transmits a signal to the NodeB for the first time, and a processing delay' for generating the uplink power control command by the NodeB is 1 subframe. The NodeB will record the UE transmission power increment in each subframe, starting from subframe 0.

When NodeB receives the signal sent by the UE for the first time in the subframe 0, the NodeB generates a corresponding uplink power control command PC_ul(0) When PC is used_ul(0) When it is equal to 11, record

{PC}_{ul}^{*} (0) = 1,

When PC is used_ul(0) When 00 hours, record

{PC}_{ul}^{*} (0) = - 1 .

It should be noted that the uplink power control command generated by the NodeB starting at the subframe 0 can only be obtained at the subframe 1, i.e. the NodeB obtains the PC at the subframe 1_ul(1-1)＝PC_ul(0) Obtaining and recording the corresponding

Similarly, NodeB can only obtain and record in subframe 2, subframe 3, and subframe 4

When the NodeB starts to transmit the special burst SB1 to the UE in subframe 4, the NodeB determines the transmission power of the special burst SB1 according to the existing closed loop power control method. Assuming that the time delay of the NodeB extracting the uplink power control command sent by the UE is 1 subframe, the transmit power PowerSB (4) used by the NodeB to send the special burst in subframe 4 is the transmit power at which the NodeB adjusts the transmit power in subframe 3 according to the uplink power control command sent by the UE that it receives in subframe 3. The transmission power PowerSB (5) used by the NodeB to transmit the special burst in subframe 5 is the transmission power at which the NodeB adjusts the transmission power in subframe 4 according to the uplink power control command it receives from the UE in subframe 4. When the NodeB sends the special burst SB1, the NodeB obtains and records it in sub-frame 4 and sub-frame 5, respectively

In subframe 6, subframeAnd 7, stopping transmitting information to the UE by the NodeB. NodeB still obtains and records corresponding uplink power control commands PC in sub-frame 6 and sub-frame 7_ul(5)、PC_ul(6) However, since the NodeB stops transmitting information to the UE, the uplink power control command PC_ul(5)、PC_ul(6) Will not be sent to the UE, and the UE will not be according to the PC_ul(5)、PC_ul(6) The transmit power is adjusted. In this case, recording is performed

Both are 0, i.e., the UE is considered to have a transmission power increment of 0 in subframe 5 and subframe 6. The command for subframe 7 is sent to the UE in subframe 8, so the power increment for subframe 7 is

When NodeB starts at sub-frame 8 and sends special burst SB2 to the UE, it calculates

<math> <mrow> <mi>PowerIncrement</mi> <mo>=</mo> <msup> <mn>10</mn> <mfrac> <mrow> <msub> <mi>P</mi> <mrow> <mi>step</mi> <mo>_</mo> <mi>ul</mi> </mrow> </msub> <mo>·</mo> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>4</mn> </mrow> <mrow> <mn>8</mn> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msubsup> <mi>PC</mi> <mi>ul</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> <mn>10</mn> </mfrac> </msup> <mo>=</mo> <msup> <mn>10</mn> <mfrac> <mrow> <msub> <mi>P</mi> <mrow> <mi>step</mi> <mo>_</mo> <mi>ul</mi> </mrow> </msub> <mo>·</mo> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>4</mn> </mrow> <mn>7</mn> </munderover> <msubsup> <mi>PC</mi> <mi>ul</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> <mn>10</mn> </mfrac> </msup> <mo>,</mo> </mrow></math>

And obtaining the total increment Powerincrement of the transmission power of the UE from the subframe 4 to the subframe 7. Here, it is assumed that the processing delay' for the NodeB to generate the uplink power control command is 1 subframe.

After the power increment is obtained in the subframe 8, the transmission power PowerSB (8) of the special burst SB2 can be obtained by calculating PowerSB (8) × pathlossseincrement. The NodeB transmits the special burst SB2 in subframe 8 and subframe 9 with the transmission power PowerSB (8).

When NodeB starts at sub-frame 12, it sends special burst SB3 to the UE, through calculation

<math> <mrow> <mi>PowerIncrement</mi> <mo>=</mo> <msup> <mn>10</mn> <mfrac> <mrow> <msub> <mi>P</mi> <mrow> <mi>step</mi> <mo>_</mo> <mi>ul</mi> </mrow> </msub> <mo>·</mo> <munderover> <mi>Σ</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>8</mn> <mo>+</mo> <mn>1</mn> <mo>-</mo> <mn>1</mn> </mrow> <mrow> <mn>12</mn> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <msubsup> <mi>PC</mi> <mi>ul</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> </mrow> <mn>10</mn> </mfrac> </msup> <mo>=</mo> <msup> <mn>10</mn> <mfrac> <mrow> <msub> <mi>P</mi> <mrow> <mi>step</mi> <mo>_</mo> <mi>ul</mi> </mrow> </msub> <mo>·</mo> <munderover> <mi>Σ</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>8</mn> </mrow> <mn>11</mn> </munderover> <msubsup> <mi>PC</mi> <mi>ul</mi> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> </mrow> <mn>10</mn> </mfrac> </msup> <mo>,</mo> </mrow></math>

And obtaining the total increment Powerincrement of the transmission power of the UE from the subframe 8 to the subframe 11.

After the power increment is obtained in the subframe 12, the transmission power PowerSB (12) of the special burst SB3 can be obtained by calculating PowerSB (12) to PowerSB (8) × pathlossseincrement. The NodeB transmits the special burst SB3 in subframe 12 and subframe 13 with the transmission power PowerSB (12).

Based on the method, the invention also provides a corresponding device for controlling the transmission power during the downlink discontinuous transmission. Fig. 5 is a schematic diagram of an apparatus for controlling transmission power during downlink discontinuous transmission, the apparatus comprising: a transmission power unit 51, a path loss value unit 52, a path loss increment unit 53, and an adjustment unit 54. The transmitting power unit 51 includes a first power unit 511 and another power unit 512.

Calculating a transmission power of the UE with the transmission power unit 51 at each subframe; and calculates an uplink path loss value of each subframe according to the received power of the NodeB and the transmission power of the UE, using the path loss value unit 52.

During downlink discontinuous transmission, when the NodeB transmits the first special burst to the UE, the transmission power of the special burst need not be adjusted, but only needs to be determined according to the existing closed-loop power control method.

During the downlink discontinuous transmission, the NodeB starts from the second special burst and adjusts the transmission power of the following special bursts. Starting from the second special burst, the path loss increment may be calculated by the path loss increment unit 53 based on the uplink path loss value obtained in the first subframe of the current special burst and the uplink path loss value of the first subframe of the previous special burst. Then, the adjusting unit 54 adjusts the transmission power of the previous special burst according to the path loss increment, and obtains the transmission power of the current special burst.

In each subframe, the first power unit 511 may have a preset value X in the first subframe in which the UE transmits information to the NodeB when the transmission power of the UE is calculated by the transmission power unit 51_TXP(0) As the transmit power of the UE; in other sub-frames where the UE sends information to the NodeB, other power units 512 may calculate X_TXP(n)＝X_TXP(n-1)·ΔP_nObtaining the transmission power X of the current subframe UE_TXP(n); wherein, X_TXP(n-1) represents the transmission power, Δ P, of the UE of the previous subframe_nIs the increment of the UE transmit power.

When the path loss value unit 52 calculates the uplink path loss value of each subframe, the path loss value unit 52 calculates

X_{PL} (n) = \frac{X_{TXP} (n)}{X_{RXP} (n)},

And with X_PL(n) as the uplink loss value of the current subframe; wherein, X_RXP(n) is the received power of the current subframe NodeB.

During discontinuous downlink transmission, when calculating the path loss increment from the second special burst, the path loss increment unit 53 calculates

And obtaining the path loss increment PathLossIncrement.

Wherein n' is the subframe number of the first subframe of the current special burst, delay is the minimum processing time delay required for calculating the uplink loss value by taking the subframe as a unit, and X_PL(n '-delay) is an uplink loss value of the subframe (n' -delay), X_PL(m) is the uplink loss value of the first subframe of the previous special burst.

The adjusting unit 54 calculates powersb (n) which is the power sb (m) x pathlossseincrement calculated by the path loss increment unit 53, and adjusts the transmission power powersb (m) of the previous special burst to obtain the transmission power powersb (n) of the current special burst. Wherein, powersb (m) is the transmission power of the first subframe of the previous special burst, and powersb (n) is the transmission power of the first subframe of the current special burst.

In the above apparatus, if the path loss value is calculated in a recursive manner, the estimation of the path loss can be more accurate. The path loss value unit 52 may be modified such that the path loss value unit 52 comprises two parts, a first unit and a second unit.

When the path loss value unit 52 is used to calculate the uplink path loss of each sub-frameWhen the value is calculated by the first unit

X_{PL} (n) = \frac{X_{TXP} (n)}{X_{RXP} (n)} .

In the first subframe of the UE sending information to NodeB, X is sent by the second unit_PL(n) as the uplink loss value of the current subframe; in other sub-frames where the UE sends information to the NodeB, the second list is used for calculation

Will be provided with

As the smooth value of the uplink loss of the current subframe; wherein, X_RXP(n) is the received power of the current subframe NodeB,

Obtaining a path loss increment PathLossIncrement;

wherein n' is the subframe number of the first subframe of the current special burst, delay is the minimum processing time delay required for calculating the uplink loss value by taking the subframe as a unit,

is the uplink loss smoothing value of the sub-frame (n' -delay "),

In the above apparatus, the transmission power of the special burst is adjusted mainly by calculating a path loss increment and according to the path loss increment. The change of the path loss of the UE can be reflected by adjusting the uplink transmission power of the UE by the NodeB, and the special burst transmission power can be adjusted according to the adjustment amount of the uplink transmission power of the UE by the NodeB. Based on the above idea, the present invention also proposes an apparatus for controlling transmission power during downlink discontinuous transmission, and fig. 6 is a schematic diagram of the apparatus, which includes a power increment recording unit 61, a total increment calculating unit 62, and an adjusting unit 63. Wherein, the power increment recording unit 61 includes a judging unit 611 and a recording unit 612; the total increment calculation unit 62 includes a second special burst unit 621 and other special burst units 622.

In each subframe, the transmission power increment of the UE may be recorded by the power increment recording unit 61. During discontinuous downlink transmission, starting from the second special burst, the total increment calculating unit 62 may calculate the total increment of the transmission power of the UE from the first subframe of the previous special burst to the first subframe of the current special burst according to the transmission power increment of the UE in each subframe. After the total increment calculating unit 62 obtains the total increment of the transmission power, the adjusting unit 63 adjusts the transmission power of the previous special burst according to the total increment of the transmission power, and obtains the transmission power of the current special burst.

When the increment of the transmission power of the UE in the current subframe is recorded in the power increment recording unit 61 for each subframe, the determining unit 611 determines whether or not the NodeB stops transmitting information to the UE in the current subframe.

When the NodeB stops sending information to the UE in the current subframe, the recording unit 612 will

And recorded as 0.

When NodeB sends information to UE in current sub-frameIn time, if the uplink power control command PC generated by NodeB_ul(n-delay') is 11, then

Record 1, if the uplink power control command PC generated by NodeB is_ul(n-delay') is 00, thenRecorded as-1.

Wherein n is the subframe number of the current subframe, delay' is the processing delay of the NodeB for generating the uplink power control command,is a transmission power increment of the subframe (n-delay') UE. According to the 3GPP standard, PC_ul(n-delay') indicates an uplink power control command "Up" of 11, and PC_ul(n-delay') 00 denotes an uplink power control command "Down".

It should be noted here that, since the NodeB transmits a signal to the UE in a downlink DTX manner, the NodeB stops transmitting any signal to the UE in some subframes, and at this time, the UE cannot obtain the uplink power control command generated by the NodeB for the subframe. In this case, consider PC_ul(n-delay′)＝0。

During discontinuous downlink transmission, when the total increment calculating unit 62 calculates the total increment of the transmission power from the first subframe of the previous special burst to the first subframe of the current special burst when the UE starts from the second special burst, and when the NodeB transmits the second special burst, the second special burst unit 621 calculates the total increment of the transmission power

Obtaining a total transmission power increment Powerincrement from a previous special burst to a current special burst of the UE; starting with the third special burst, the calculation is performed by the other special burst unit 622

And obtaining the total increment of the transmission power of the UE from the previous special burst to the current special burst.

Where m is the subframe number of the first subframe of the previous special burst, n' is the subframe number of the first subframe of the current special burst, P_{step_ul}Is the power adjustment step size configured by the RNC to the UE.

The adjusting unit 63 calculates the power sb (n) ═ power sb (m) × power increment from the adjustment amount PowerIncrement of the UE transmission power obtained by the total increment calculating unit 62, and adjusts the transmission power powersb (m) of the previous special burst to obtain the transmission power powersb (n) of the current special burst. Wherein, powersb (m) is the transmission power of the first subframe of the previous special burst, and powersb (n) is the transmission power of the first subframe of the current special burst.

The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for controlling transmit power during downlink discontinuous transmission, comprising:

a base station (NodeB) calculates the transmitting power of User Equipment (UE) in each subframe according to the transmitting power of the UE in the previous subframe and an uplink power control command transmitted by the NodeB, and calculates the uplink path loss value of each subframe according to the receiving power of the NodeB to the UE and the transmitting power of the UE; in an uplink Dedicated Physical Channel (DPCH), the UE cannot communicate with the NodeB using an uplink Discontinuous Transmission (DTX) scheme;

during discontinuous downlink transmission, when the NodeB transmits a first special burst to the UE, the transmitting power of the special burst is not adjusted, the NodeB adjusts the transmitting power of each subsequent special burst from a second special burst, and when the transmitting power of the special burst is adjusted, the path loss increment from the previous special burst to the current special burst is calculated according to the uplink path loss value;

2. The method of claim 1, wherein the UE transmit power is calculated by:

3. The method of claim 2, wherein the calculating is performed every sub-frame

With X_PL(n) as the uplink loss value of the current subframe;

4. The method of claim 3, wherein the adjusting the transmission power of the special burst during the downlink discontinuous transmission is performed by calculating

5. The method of claim 2, wherein the calculation is performed every subframe

With uplink path loss smoothing value

As the uplink loss value of the current subframe;

6. The method of claim 5, wherein the step of removing the substrate comprises removing the substrate from the substrateWhen the transmission power of the special burst is adjusted during the downlink discontinuous transmission, the transmission power is calculated

where n' is the subframe number of the first subframe of the current special burst, delay "is the minimum processing delay required to calculate the path loss smoothing value,

7. The method according to claim 1, wherein the adjusting of the transmission power PowerSB (m) of the previous special burst is implemented by calculating PowerSB (n ') ═ PowerSB (m) × pathlossseincrement, and the transmission power PowerSB (n') of the current special burst is obtained;

8. The method of claim 7, wherein the transmission power of the first subframe of the special burst is used as the transmission power of the special burst.

9. A method for controlling transmit power during downlink discontinuous transmission, comprising:

recording the transmission power increment of the UE in each subframe; wherein, in each subframe, the following steps are carried out to record the UE inTransmit power increment per subframe: if NodeB stops sending information to UE in the current sub-frame, NodeB willRecorded as 0; otherwise, the uplink power control command PC generated at NodeB_ulWhen (n-delay') is 11, will

Record 1, uplink power control command PC generated at NodeB_ulWhen (n-delay') is 00, will

Record as-1; wherein n is the subframe number of the current subframe, delay' is the processing delay in subframe unit required by the NodeB to generate the uplink power control command,

is a transmission power increment of the subframe (n-delay') UE;

during downlink discontinuous transmission, when the NodeB transmits a first special burst to the UE, the transmitting power of the special burst is not adjusted, the NodeB adjusts the transmitting power of each subsequent special burst from a second special burst, and when the transmitting power of the special burst is adjusted, the total transmitting power increment from the previous special burst to the current special burst of the UE is calculated according to the transmitting power increment;

adjusting the sending power of the previous special burst according to the total sending power increment to obtain the sending power of the current special burst;

when the transmission power of the special burst is adjusted during downlink discontinuous transmission,

when NodeB sends the second special burst, it calculates

starting from the third special burst by calculation

10. The method according to claim 9, wherein the adjusting of the transmission power PowerSB (m) of the previous special burst is achieved by calculating PowerSB (n ') ═ PowerSB (m) x PowerIncrement, and the transmission power PowerSB (n') of the current special burst is obtained;

11. The method of claim 10, wherein the transmission power of the first subframe of the special burst is used as the transmission power of the special burst.

12. An apparatus for controlling transmission power during downlink discontinuous transmission using the method of claim 1, comprising:

13. The apparatus of claim 12, wherein the transmit power unit comprises:

14. The apparatus of claim 12, wherein the path loss value unit is configured to calculate per sub-frame

With X_PL(n) as the uplink loss value of the current subframe;

15. The apparatus of claim 14, wherein the path loss increment unit is configured to discontinuously transmit in downlinkDuring which the transmission power of the special burst is adjusted, by calculation

16. The apparatus of claim 12, wherein the path loss value unit comprises:

a first unit for calculating at each sub-frame

With uplink path loss smoothing value

As the uplink loss value of the current subframe;

17. The apparatus of claim 16, wherein the path loss increment unit is configured to calculate the transmission power of the special burst when adjusting the transmission power during the downlink discontinuous transmission

18. The apparatus according to claim 12, wherein the adjusting unit is configured to calculate PowerSB (n ') ═ PowerSB (m) × pathlossseincrement, and implement adjustment of the transmission power PowerSB (m) of the previous special burst to obtain the transmission power PowerSB (n') of the current special burst;

19. The apparatus of claim 18, wherein the transmission power of the first subframe of the special burst is used as the transmission power of the special burst.

20. An apparatus for controlling transmission power during downlink discontinuous transmission using the method of claim 9, comprising:

21. The apparatus of claim 20, wherein the power increment recording unit comprises:

Recorded as 0; when NodeB sends information to UE in current sub-frame, if NodeB generates up power control command PC_ul(n-delay') is 11, then

Record 1, if the uplink power control command PC generated by NodeB is_ul(n-delay') is 00, then

Record as-1;

wherein n is the subframe number of the current subframe, delay' is the processing delay in subframe unit required by the NodeB to generate the uplink power control command,is a transmission power increment of the subframe (n-delay') UE.

22. The apparatus of claim 20, wherein the total increment calculating unit comprises:

other special burst units for starting from the third special burst by calculation

23. The apparatus according to claim 20, wherein the adjusting unit is configured to calculate PowerSB (n ') ═ PowerSB (m) x PowerIncrement, and implement adjustment of the transmission power PowerSB (m) of the previous special burst to obtain the transmission power PowerSB (n') of the current special burst;

24. The apparatus of claim 23, wherein the transmission power of the first subframe of the special burst is used as the transmission power of the special burst.