WO2011153765A1

WO2011153765A1 - Method and device for power control

Info

Publication number: WO2011153765A1
Application number: PCT/CN2010/077793
Authority: WO
Inventors: 胡啸; 史凡
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-08
Filing date: 2010-10-15
Publication date: 2011-12-15
Also published as: CN102281618B; CN102281618A

Abstract

A method and device for power control is provided in the present invention, wherein the method for power control includes: setting the present power adjustment step according to the present channel fading state and the previous power adjustment steps; controlling transmission power by using said present power adjustment step. The problem in the prior art that applying fixed step in power control results in lack of convergence in the fast-fading channel leading to deterioration of communication quality is solved by the present invention, which guarantees the communication quality.

Description

METHOD AND APPARATUS FOR POWER CONTROL FIELD OF THE INVENTION The present invention relates to the field of wireless communications, and in particular to a method and apparatus for power control. BACKGROUND Power control algorithms are typically analyzed and studied from two levels. If analyzed from a global level, the power control can meet the SIR (Signal to Interference Ratio) requirements of all users. It is the focus of power control algorithm to analyze the convergence and convergence speed of power control algorithms from the local level, that is, the ability to track channel changes.

In the UMTS (Universal Mobile Telecommunications System) system, the channel implements power control through the reverse link, that is, the power control of the uplink is adjusted by commands carried in the downlink, for example, in TD- In the SCDMA (Time Division-Synchronous Code Division Multiple Access) system, each sub-frame (5ms) performs power control, the power control rate is 200HZ, and the power control step size is ldB, 2dB, 3dB. Choose a fixed value. The power control command is generated by the receiving end detecting the SIR value of the received signal and comparing with the target value. If the SIR <SIR target value, a control command for increasing the transmit power is generated, and vice versa, the other party is required to reduce the transmit power, where the power adjustment is performed. The command is TPC (Transmit Power Control). In the adjustment process of these TPCs, the adjustment amount of one power adjustment step is indicated, and the receiving end raises or lowers the transmission power of one step correspondingly after receiving the TPC. There have been many methods in the prior art for studying the power control of wireless communication systems, which use a fixed step size to adjust the power. The inventor found that due to the diversity and complexity of the channel environment, some disadvantages are caused. For example, in a channel with fast fading, if the communication party cannot adjust the step size in time, the power control can converge faster or keep up with the fading rate of the channel. , the link will be interrupted due to the deterioration of communication quality. In the prior art, since the power control uses a fixed step size, the convergence is insufficient in a channel with a fast fading, resulting in a problem of deterioration in communication quality. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method and apparatus for power control to at least solve the problem of insufficient convergence in a channel with fast fading due to a fixed step size of power control in the prior art, resulting in communication quality. The problem of deterioration. According to an aspect of the present invention, a method of power control is provided, comprising: setting a current power adjustment step according to a current channel attenuation state and a previous power adjustment step; using the current power adjustment described above The step size is used to control the transmit power. Further, setting the current power adjustment step according to the current channel attenuation state and the previous power adjustment step includes: setting the current power adjustment step size to be greater than an absolute value of the previous power adjustment step; or Set the above current power adjustment step size to 0. Further, when the current channel is in a deep fading state, setting the current power adjustment step size to be greater than the absolute value of the previous power adjustment step includes: setting the current power adjustment step size to the previous one. An integer multiple of the absolute value of the power adjustment step size. Further, the current channel is in a deep fading state, and the predetermined number of the previous power adjustment steps before the current power adjustment step is a power adjustment step in the depth attenuation state or the depth attenuation gain state. For a long time, setting the current power adjustment step size to be greater than the absolute value of the previous power adjustment step includes: setting the current power adjustment step size to the absolute value of the previous power adjustment step (1+) A%) times, where 0<A<50. Further, setting the current power adjustment step according to the current channel attenuation state and the previous power adjustment step includes: determining the most recent M/2 previous power adjustments when the current channel is in the depth attenuation state Whether the step size is not greater than 0, wherein the previous M previous power adjustment steps are pre-stored, and M is a natural number; if none of them is greater than 0, the current power adjustment step is set to be greater than the previous power. Adjust the absolute value of the step size. Further, the current channel attenuation state is determined by the following steps: if the M previous power adjustment steps before the current power adjustment step are all standard power adjustment steps, the current channel is a deep attenuation state. Wherein, M is a natural number, and the standard power adjustment step size is greater than 0; if the M previous power adjustment steps before the current power adjustment step are the standard power adjustment step, and the current power adjustment step The long estimated value is greater than 0, and the first M/2 previous power adjustment steps in the foregoing M previous power adjustment steps are the power adjustment steps in the depth attenuation state or the depth attenuation gain state Long, then The current channel is a deep attenuation gain state; if the M previous power adjustment steps before the current power adjustment step are both less than 0, the current channel is a normal state. Further, the above M is greater than or equal to the number of power adjustment steps required to determine the channel quality degradation trend. Further, performing power control by using the current power adjustment step size includes: calculating a current transmit power according to the current power adjustment step; determining whether the current transmit power is greater than a power control threshold; if greater than, stopping increasing transmit power . Further, the mobile terminal and/or the network side device perform the above method of power control. According to another aspect of the present invention, a power control apparatus is provided, including: a setting unit, configured to set a current power adjustment step according to a current channel attenuation state and a previous power adjustment step; and a control unit, configured to: The control of the transmission power is performed using the current power adjustment step size described above. Further, the setting unit includes: a setting module, configured to set the current power adjustment step size to be greater than an absolute value of the previous power adjustment step, or set the current power adjustment step to 0. Further, the setting module includes: a first setting submodule, configured to set the current power adjustment step size to an integer multiple of an absolute value of a previous power adjustment step; and a second setting submodule, configured to: The power adjustment step size is set to (1+A%) times the absolute value of the previous power adjustment step size, where 0<A<50. Further, the setting unit includes: a determining module, configured to determine, when the current channel attenuation state is deep attenuation, whether the most recent M/2 previous power adjustment step sizes are not greater than 0, where The M previous power adjustment steps, M is a natural number; and the processing module is configured to set the current power adjustment step size to be greater than an absolute value of the previous power adjustment step when the ratio is not greater than 0. Further, the device further includes: a determining unit, wherein the determining unit is configured to determine the current channel attenuation state by using the following steps: if the M previous power adjustment steps before the current power adjustment step are standard power adjustment Step size, wherein the current channel is in a deep attenuation state, where M is a natural number, and the standard power adjustment step size is greater than 0; if the previous power adjustment steps before the current power adjustment step are the standard power Adjusting the step size, and the estimated value of the current power adjustment step is greater than 0, and the above M previous power adjustments The current M/2 of the previous power adjustment steps in the step size is the power adjustment step size in the depth attenuation state or the depth attenuation gain state, and the current channel is the depth attenuation gain state; If the M previous power adjustment steps before the power adjustment step are both less than 0, the current channel is a normal state. According to the present invention, the current power adjustment step size is set according to the current channel attenuation state and the previous power adjustment step size, so that the current power adjustment step size is adapted to the current channel attenuation state, so that the deep fading can be quickly corrected. The transmit power of the antenna in the environment. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a preferred flow chart of a method for power control according to an embodiment of the present invention; FIG. 2 is another preferred flow chart of a method for power control according to an embodiment of the present invention; A preferred structural diagram of a power control device in accordance with an embodiment of the present invention; and FIG. 4 is a schematic diagram of a preferred functional block of a power control device according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a flow chart of a method of power control in an embodiment of the present invention. As shown in FIG. 1, the power control method includes:

S102, setting a current power adjustment step according to a current channel attenuation state and a previous power adjustment step size;

S104: Perform control of the transmit power using the current power adjustment step size described above. In the prior art, the power control uses a fixed step size, thereby causing insufficient convergence in a channel with a fast fading, resulting in a problem of deterioration in communication quality. In contrast, a preferred embodiment of the invention, according to The current channel attenuation state and the previous power adjustment step size set the current power adjustment step size so that the current power adjustment step size is adapted to the current channel attenuation state, thereby quickly correcting the antenna transmission in the deep fading environment. power. Preferably, the step of setting the current power adjustment step according to the current channel attenuation state and the previous power adjustment step may include: setting the current power adjustment step size to be greater than the previous power adjustment step size Absolute value; or set the current power adjustment step size to zero. Preferably, when the current channel is in a deep fading state, the step of setting the current power adjustment step size to be greater than an absolute value of the previous power adjustment step may include: adjusting the current power The step size is set to an integral multiple of the absolute value of the previous power adjustment step. Preferably, the current power adjustment step size is set to twice the absolute value of the previous power adjustment step. Preferably, the current channel is in a deep fading state, and a predetermined number of the previous power adjustment step sizes before the current power adjustment step is the depth attenuation state or the depth attenuation gain state. The step of setting the current power adjustment step size to be greater than the absolute value of the previous power adjustment step size may include: setting the current power adjustment step size to the previous power adjustment step size The power adjustment step is an absolute value of (1 + A%) times, where 0 < A < 50. For example, when the M/2 previous power adjustment steps before the current power adjustment step are twice the absolute value of the standard power adjustment step, the current channel is considered to enter the depth attenuation gain state, and the The current power adjustment step size is set to (1 + A%) times the absolute value of the previous power adjustment step, where 0 < A < 50. The above M is a natural number. Preferably, the step of setting the current power adjustment step according to the current channel attenuation state and the previous power adjustment step may include: determining, when the current channel is in the deep attenuation state, the nearest M/2 Whether the previous power adjustment step size (that is, the last saved M/2 previous power adjustment step sizes) is not greater than 0, wherein the last M previous power adjustment step sizes are saved in advance, M is a natural number; if none of them is greater than 0, the current power adjustment step is set to be greater than the absolute value of the previous power adjustment step. Preferably, the current M channel adjustment state is pre-stored to determine the current channel state, where M is a natural number, which includes:

1) If the M previous power adjustment steps before the current power adjustment step are all standard power adjustment steps, the current channel is a depth attenuation state, where the standard The power adjustment step size is greater than 0;

2) if the M previous power adjustment steps before the current power adjustment step are a standard power adjustment step, and the current power adjustment step is estimated to be greater than 0, and the M The first M/2 of the previous power adjustment steps in the previous power adjustment step are the power adjustment step size in the depth attenuation state or the depth attenuation gain state, then the current The channel is a deep attenuation gain state; for example, when the M/2 previous power adjustment steps before the current power adjustment step are twice the absolute value of the standard power adjustment step, the current channel entry depth is considered Attenuating the gain state, setting the current power adjustment step size to (1+A%) times the absolute value of the previous power adjustment step, where 0<A<50.

3) If the M previous power adjustment steps before the current power adjustment step are both less than 0, the current channel is in a normal state. Preferably, the M is greater than or equal to the number of power adjustment steps required to determine a channel quality degradation trend. In the preferred embodiment, by selecting to save a reasonable amount of previous power adjustment steps, the problem of insufficient convergence of power control due to excessive M values or too fast convergence due to too small M values is avoided. Preferably, the step of performing power control using the current power adjustment step may include: calculating a current transmit power according to the current power adjustment step; determining whether the current transmit power is greater than a power control threshold; , then stop increasing the transmission power. In the preferred embodiment, by controlling the total amount of adjustment of the transmission power, the interference caused by the larger power control step is suppressed. At the same time, the transmit power cannot exceed the maximum allowable transmit power. If it is exceeded, it does not increase. The corresponding power control step output is 0. Preferably, the mobile terminal and/or the network side device perform the method of power control in each of the above preferred embodiments. In the preferred embodiment, by using the power control method of the above embodiment simultaneously on the mobile terminal and the network side device, the uplink and downlink channels are collectively opposed to the channel depth attenuation, so that power control can be better implemented. Preferably, the current power adjustment step is set according to the current channel attenuation state and the previous power adjustment step, and if the communication partner requests to increase the transmission power after the deep fading state, the current power adjustment step is set. The absolute value of the power adjustment step size is greater than the previously described, and the specific method includes: setting the current power adjustment step size to an absolute value of the previous power adjustment step size. Integer multiple, preferably, the current power adjustment step size is set to twice the absolute value of the previous power adjustment step. If it is required to reduce the transmission power during the above state, and the power control command word is less than 0, the power adjustment step size is set to 0, that is, the transmission power is not lowered. Preferably, after the current channel is in the sub-mode depth gain state of the deep fading, setting the current power adjustment step size to be greater than the absolute value of the previous power adjustment step includes:

1) If the deep fade mode has been entered, and the nearest M/2 power control step is 2 times the standard value, it means that the current power control has not yet met the channel change speed, which is not convergent, so the current The power adjustment step size is set to (1 + A%) times the absolute value of the previous power adjustment step, where 0 < A < 50. 2) If a command to reduce the transmit power is received during this state, and the power control command word is less than 0, the power adjustment step size is set to 0, that is, the transmit power is not lowered. In the above preferred embodiment, the power adjustment step size is dynamically changed according to the rate of decline of the channel, so that the power control is quickly converged, and the effect of the channel fluctuation on the algorithm is minimized, and the communication quality is ensured. Preferably, when the current channel attenuation state is a normal state, the power adjustment step size is an original fixed step size. In order to better illustrate the present invention, the accompanying DPCH channel of the TD-SCDMA system is exemplified below. The base station carries a TPC command word that can control the uplink companion DPCH channel in the downlink companion DPCH channel, and the same UE also carries the TPC command word that controls the downlink companion DPCH channel through the uplink companion DPCH channel, and the UE transmits the corresponding relationship in a specific time slot. Such two channels constitute a closed loop power control system. It will be understood by those skilled in the art that an embodiment of the present invention will be described in detail by using a pair of uplink and downlink accompanying DPCH channels in a TD-SCDMA wireless communication system in conjunction with the accompanying drawings, which is merely an example, but the present invention is not limited to only For these two channels, any uplink and downlink channel with a TPC power adjustment mechanism that can form a closed-loop system can be applied. Before describing the embodiment described in Figure 2, the channel environment is first identified. By observing the TPC record of the statistical receiving end, we can know the effect of the power control over a period of time. If there are multiple consecutive rising commands, then the current channel quality is poor, then it is considered to be in deep fading. Mode, of course, here are also several other defined modes. Specifically, you only need to observe the statistical records of the TPC. At this point, the identification of the channel environment is completed. Next, it is necessary to extract the corresponding service policy for different channel environments. If it is already in the deep fading mode, then the corresponding step size adjustment strategy is used to output the power control step size. Finally, in order to prevent the power from rising too high, causing disturbance to other users, the total amount of power raised in a certain period of time is suppressed. Finally, enter the next round of the power control process. In this embodiment, the power adjustment step size indicated by the TPC represents a relative rise and fall of the transmission power, and is no longer a specific adjustment amount. The power control mode corresponding to the current channel attenuation state may be one of the following: (1) Normal mode: If there are no M consecutive non-up power commands in the power control gain register

(The adjustment amount of the transmission power may be OdB), and then the power control mode corresponding to the current channel attenuation state is determined to be the normal mode.

(2) Deep decay mode: If the positive gain value of M consecutive normal modes appears in the power control gain register, it is determined that the power control mode corresponding to the current channel attenuation state is the deep decay mode. (3) Deep fading gain mode: In deep fading mode, the current TPC(M)>0, and the first M/2 power control gain records TPC(Ml)... TPC(M/2) is deep fading power or deep The gain power is determined, and the power control mode corresponding to the current channel attenuation state is determined to be a deep fading gain mode. In this embodiment, the fast-rising slowdown algorithm can be described as follows:

(1) Deep fading mode control: If the newly received TPC is greater than 0 in deep fading mode, the transmit power of the basic step is doubled; if the TPC is less than 0, the power increment is 0.

(2) Deep-fat gain mode control: If the newly received TPC is greater than 0, increase the gain by % on the basis of the previous power-control gain. If the TPC is less than 0, the power increment is 0.

(3) Normal mode control: Increase or decrease the transmit power in the basic power control step. The method according to the embodiment of the present invention does not change the TPC content carried in the message, but adjusts the antenna output according to the change of the TPC on the corresponding channel. The step size adjustment variation of the power control is recorded in the corresponding power control gain register for use in state recognition and power control adjustment. 2 is a preferred flow chart of a method of power control in an embodiment of the present invention, which includes the following Steps: Step S200: Detect a TPC command word carried in the uplink accompanying DPCH channel, and let TPC=+1, update the TPC command word or the power control gain data, and store the data in the power control gain register, which is a first-in first-out type. Queue structure, when the network is initialized, the status register content is "0", indicating "normal state", for example, the content of the power control gain register is updated to "00000 Γ, where ^ _· & Μ = 6. Step S201, judgment power control If the gain register is full, if the flow is full, go to step S202; otherwise, go to step S208. In this embodiment, the power control algorithm causes the first M-1 records after the network initialization to be the TPC carried from the uplink companion channel. And directly outputting the power control output acting on the downlink companion channel, starting from the Mth TPC, that is, after the power control gain register is full queue, the process proceeds to step S202, and the content of the jt is set to "111111". Step S202, detecting state The status flag of the register. If the flag is deep decay mode (also called deep decay mode) or deep decay gain mode (also called deep attenuation gain mode), go to step S204; otherwise, Go to step S203. Step S203, determine whether to enter the deep decay mode. If M consecutive power up command samples appear in the power control gain register, for example, "111111" in step S201, proceed to step S207, if the condition is not met Then, the process goes to step S208. Step S204, it is determined whether to fall back to the normal mode. It is detected whether the M/2 non-up power command continuously appears in the record, such as "22200-1", if yes, the process proceeds to step S208, and vice versa. Step S205, determining whether to enter the deep decay gain mode. Specifically, detecting the power control gain register to determine whether it is in the deep decay gain mode: if the current TPO0, and the previous M/2 power gain is recorded as continuous The deep fading or deep fading gain power, as in the sample "12022 Γ, proceeds to step S206, and if the above conditions are not met, the original state is maintained. The power control gain module enables the network to adapt to different degrees of deep decay. Step S206, entering a deep fading gain mode. If TPC(M)>0, the power is increased by the % amplitude based on the last power control amount, that is, the current power control step size is set to the previous power adjustment step size. If the TPC(M) < 0, the transmission power is not increased, that is, the original transmission power is maintained, and the current power control step is 0, and the process proceeds to step S209. Step S207, entering a deep fading mode, if TPC(M)>0, increasing the frequency by twice the basic step size The power, that is, the current power control step is set to twice the absolute value of the previous power adjustment step; if TPC(M) < 0, the transmission power is not increased, that is, the original transmission power is maintained, so that the current The power control step size is zero. The sample value of jt匕 is "1 1 1 1 1 2" or "1 1 1 2 2 0", and the step 4 is gathered into S209. Step S208, entering the normal mode, adjusting according to the standard power adjustment step size specified by the protocol, updating the state and the power control gain register, and then proceeding to step S209. Step S209, gain suppression, the sum of the deep decay power (including the deep fading gain power) in the statistical gain register, the value is recorded as SumTPC, and if it is greater than the power control threshold ThMax, the transmission power is no longer increased. At the same time, the adjusted output power cannot exceed the total transmit power. Step S210: Output a downlink accompanied DPCH channel (Dedicated Physical Channel) to adjust the power value, and update the power control gain register to update the queue content. In the embodiment shown in Figure 2, the main parameters can be determined by:

1) M: The length of the power control record queue. The value is determined to be greater than or equal to the number of TPCs that can determine the trend of channel quality degradation. The value should not be selected too much. If it is too large, the convergence of the power control is insufficient, and the connection may be lost. If it is too small, the change will be too fast. It can be modified as needed. The recommended range is [4, 10].

2) M/2: Deep fading gain judges the length of the reference record, taking an integer.

3) A: Deep decay gain factor. The simulation study is preset to 20% and can be modified as needed. The larger the value, the stronger the ability to adapt to deep fading, but the jitter will increase accordingly.

4) ThMax: The power control threshold value, the sum of the power that can be raised in the observation period of the power control gain register. If the value is set too large, the interference generated by the adjacent cell is large, too small and can not play. The function of power control convergence, it has a direct relationship with the length of the observation window, the recommended range: M ~ 3M dB. Through the judgment and calculation of steps S200 to S210, in the channel with large fading, the transmission power of the downlink-associated DPCH channel can rapidly increase the amplitude of the power control and shorten the time of convergence of the power control without exceeding the maximum transmission power. The adaptive power control capability in the deep fading environment is realized, and the power output is not excessively increased, which ensures that the normal operation of the adjacent cell is not damaged, and the adaptability of the power control of the TD-SCDMA system is increased. The uplink and downlink DPCH channels constitute a closed loop power control system, and the above method in this embodiment only needs a storage space to save the corresponding TPC function control command words, and performs less calculations to work. Therefore, the same process Also suitable for other pairs of distributions with TPC power control mechanism Wireless channel. The algorithm can also be used on the mobile station side to implement anti-deep fading performance of the uplink channel. If the above method of the embodiment of the present invention is used at the same time on the network side and the mobile terminal, the uplink and downlink channels are combined to resist the deep fading capability. The effect will be even better. The present invention also provides a power control apparatus that can implement the above method of power control. 3 is a schematic structural diagram of an apparatus for power control according to an embodiment of the present invention. As shown in FIG. 3, a device for power control according to an embodiment of the present invention includes: a setting unit 302, configured to use a current channel attenuation state and a previous The power adjustment step size sets the current power adjustment step size; the control unit 304 is configured to perform transmission power control using the current power adjustment step size. In the prior art, the power control uses a fixed step size, thereby causing insufficient convergence in a channel with a fast fading, resulting in a problem of deterioration in communication quality. In contrast, in the embodiment of the present invention, the current power adjustment step size is set according to the current channel attenuation state and the previous power adjustment step size, so that the current power adjustment step size is adapted to the current channel attenuation state, so that the current correction can be quickly corrected. The transmit power of the antenna in a deep fading environment. Preferably, the setting unit 302 includes: a setting module 3021, configured to set the current power adjustment step size to be greater than an absolute value of the previous power adjustment step, or adjust the current power adjustment step The length is set to 0. Through the setting unit 302 described above, the transmission power can be dynamically changed according to the attenuation rate of the channel, so that the power control is quickly converged, and the communication quality is ensured. Preferably, the setting module 3021 includes: a first setting submodule, configured to set the current power adjustment step to an integer multiple of an absolute value of a previous power adjustment step, and preferably, adjust the current power The step size is set to 2 times the absolute value of the previous power adjustment step; the second setting submodule is configured to set the current power adjustment step to an absolute value of the previous power adjustment step (1) +A% ) times, where 0<A<50. Preferably, the setting unit 302 may further include: a determining module 3022, configured to determine the most recent M/2 previous power adjustment steps when the current channel attenuation state is depth attenuation (ie, last Whether the saved M/2 previous power adjustment steps are not greater than 0, wherein the last M previous power adjustment steps are pre-stored, and the data is a natural number; and the processing module 3023 is used in the most recent When Μ/2 of the previous power adjustment step sizes are not greater than 0, the current power adjustment step size is set to be greater than the absolute value of the previous power adjustment step. Preferably, the device for power control further includes: a determining unit 306, the determining unit The method is used to determine the current channel attenuation state by using the following steps:

1) If the M previous power adjustment steps before the current power adjustment step are the standard power adjustment step, the current channel is a deep attenuation state, where M is a natural number, the standard The power adjustment step size is greater than 0; 2) if the M previous power adjustment step sizes before the current power adjustment step size are the standard power adjustment step size, and the current power adjustment step size is estimated Greater than 0, and the first M/2 of the previous power adjustment steps of the M of the previous power adjustment steps (ie, the last saved M/2 previous power adjustment steps) are In the depth attenuation state or the power adjustment step size in the depth attenuation gain state, the current channel is a depth attenuation gain state; 3) if the current power adjustment step is before the M previous If the power adjustment step size is less than 0, the current channel is in a normal state. 4 is a software functional diagram of a device for power control according to an embodiment of the present invention. The software features of the power controlled device include:

1) a receiving module 402, configured to acquire a TPC power control command word from the communication partner; 2) an update module 404, configured to update the power control gain register, because one set is set at the receiving end

M floating-point buffer space, so the last M times TPC or power control gain (the power control algorithm output value of this embodiment, this value will replace the original TPC record) will be recorded, whenever a new record appears, The data structure updates its members in a first-in, first-out manner in a queue manner;

3) The determining module 406 is configured to initialize the normal mode when the mode is judged to be running in the network, and determine the environmental mode of the current channel and the update status of the status register according to the selection criteria of the respective modes of the power control gain recording;

4) The control module 408 is used for the fast rise and fall control to determine the amount of power control gain in different modes. If the SIR of the channel cannot reach the minimum expected value on the network side, the bit error rate will increase or even lose the link, and after a certain degree, the interference will occur. Therefore, once the desired SIR target is reached in deep fading mode, the amount of power control gain is no longer increased, and the excess power is slowly reduced based on ensuring that the link is not lost.

5) The suppression module 410, the power suppression module, excessive boosting power will increase the interference of neighboring cells. 6) The output module 412 is configured to output the transmit power to the antenna end of the channel after determining the power control gain amount, and update the record at the corresponding position of the power control gain queue. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method of power control, comprising:

Setting a current power adjustment step according to a current channel attenuation state and a previous power adjustment step size;

The control of the transmit power is performed using the current power adjustment step size.

2. The method according to claim 1, wherein the step of setting the current power adjustment step according to the current channel attenuation state and the previous power adjustment step comprises:

Setting the current power adjustment step size to be greater than an absolute value of the previous power adjustment step; or

Set the current power adjustment step size to zero.

The method according to claim 2, wherein, when the current channel is in a deep fading state, setting the current power adjustment step size to be greater than an absolute value of the previous power adjustment step size Step 4 of the convergence includes:

The current power adjustment step size is set to an integral multiple of the absolute value of the previous power adjustment step.

The method according to claim 2 or 3, wherein the current channel is in a deep fading state, and the predetermined number of the previous power adjustment steps before the current power adjustment step When the power adjustment step size is in the depth attenuation state or the depth attenuation gain state, the step of setting the current power adjustment step size to be greater than the absolute value of the previous power adjustment step includes:

The current power adjustment step size is set to (1 + A%) times the absolute value of the previous power adjustment step, where 0 < A < 50.

The method according to claim 1, wherein the step of setting the current power adjustment step according to the current channel attenuation state and the previous power adjustment step comprises:

When the current channel is in a deep attenuation state, it is determined whether the most recent M/2 previous power adjustment step sizes are not greater than 0, wherein the last M previous power adjustment step sizes are pre-stored, M is a natural number; If neither is greater than 0, the current power adjustment step size is set to be greater than the absolute value of the previous power adjustment step.

6. The method according to claim 1, wherein the current channel attenuation state is determined by the following steps:

If the M previous power adjustment steps before the current power adjustment step are all standard power adjustment steps, the current channel is a deep attenuation state, where M is a natural number, and the standard power The adjustment step size is greater than 0;

If the M previous power adjustment steps before the current power adjustment step are the standard power adjustment step, and the estimated value of the current power adjustment step is greater than 0, and the M The first M/2 of the previous power adjustment steps in the previous power adjustment step are the power adjustment step size in the depth attenuation state or the depth attenuation gain state, then the current The channel is a deep attenuation gain state;

If the M previous power adjustment steps before the current power adjustment step are both less than 0, the current channel is in a normal state.

The method according to claim 5 or 6, wherein the M is greater than or equal to the number of power adjustment steps required to determine a channel quality degradation trend.

8. The method according to claim 1, wherein the step of performing power control using the current power adjustment step comprises:

Calculating the current transmit power according to the current power adjustment step size;

Determining whether the current transmit power is greater than a power control threshold;

If it is greater than, stop increasing the transmission power.

9. The method according to claim 1, wherein the mobile terminal and/or the network side device perform the method of power control.

10. A power control device, comprising: a setting unit configured to set a current power adjustment step size in a current channel attenuation state and a previous power adjustment step size;

And a control unit, configured to perform control of the transmit power by using the current power adjustment step.

The device according to claim 10, wherein the setting unit comprises: a setting module, configured to set the current power adjustment step size to be greater than an absolute value of the previous power adjustment step size, Alternatively, the current power adjustment step size is set to zero.

The device according to claim 11, wherein the setting module comprises:

a first setting submodule, configured to set the current power adjustment step size to an integral multiple of an absolute value of a previous power adjustment step;

And a second setting submodule, configured to set the current power adjustment step size to (1+A%) times the absolute value of the previous power adjustment step, where 0<A<50.

The device according to claim 10, wherein the setting unit comprises:

a determining module, configured to determine, when the current channel attenuation state is deep attenuation, whether the most recent M/2 previous power adjustment step sizes are not greater than 0, where the most recent M previous records are saved in advance Power adjustment step size, M is a natural number;

a processing module, configured to set the current power adjustment step size to be greater than an absolute value of the previous power adjustment step when the most recent M/2 of the previous power adjustment step sizes are not greater than 0 value.

14. The apparatus of claim 10, further comprising: a determining unit, wherein the determining unit is configured to determine the current channel attenuation state by:

If the M previous power adjustment steps before the current power adjustment step are the standard power adjustment step, the current channel is a depth attenuation state, where M is a natural number, and the standard power adjustment The step size is greater than 0;

If the M power adjustment step sizes before the current power adjustment step are the standard power adjustment step size, and the current power adjustment step size is greater than 0, and the M locations The first M/2 of the previous power adjustment steps in the previous power adjustment step is the power adjustment step in the depth attenuation state or the depth attenuation gain state, and the current channel is Depth attenuation gain state;