CN1479541A - TDD CDMA system power control method and device - Google Patents
TDD CDMA system power control method and device Download PDFInfo
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Abstract
The method includes following steps: receiving signal transmitted by opposite party, obtaining transmitting power utilized currently, obtaining transmitting power estimated value of current weighted smooth up-loading transmitting power, calculating the absolute value of difference between transmitting power utilized currently and transmitting power estimated value of current weighted smooth up-loading transmitting power delta= | PTX - Present |; determining which prearranged interval the value is located at; step length is adjusted and determined, based on prearranged power corresponding to interval the value of delta is located at. The equipment includes receiver and transmitter, power measurement device, storage, control and calculating device. By using the invention, the step length of power control can be adjusted dynamically as environment change.
Description
Technical Field
The present invention relates to code division multiple access mobile communication, and more particularly, to a power control method and apparatus for a time division duplex code division multiple access (TDD CDMA) system.
Background
In a Code Division Multiple Access (CDMA) system, power control is mainly to overcome near-far effect, reduce system interference and save power, and the technique is to compensate fading in a wireless channel timely and moderately on the basis of evaluating received signal energy or signal-to-noise ratio index at a receiver end, thereby maintaining communication quality of a user, not generating unnecessary interference to other users in the same wireless resource, and ensuring system capacity.
In the existing CDMA system, power control is divided into forward power control and reverse power control, and the process mainly includes outer loop power control, inner loop power control, open loop power control, and the like. The purpose of reverse power control (also called uplink power control) is to control the transmission power of the terminals, and the reverse power control can make the transmission power of each terminal most reasonable, so as to save energy and prolong the service life of the terminal battery. Forward power control (also called downlink power control) is where the ue controls the transmit power of a base station (Node B) based on signal-to-interference ratio (SIR) measurements.
The following describes an uplink power control scheme as an example. In a conventional uplink power control method, a base station assists a user terminal to adjust the transmission power of the user terminal, so that the terminal always maintains reasonable transmission power. The base station detects the signal-to-interference ratio (SIR) of the demodulated uplink service channel at regular intervals, then compares the SIR with a target value (namely SIRtarget), and sends a command for reducing the transmitting power if the measured value is higher than the target value; otherwise, an instruction to increase the transmission power is sent. And after receiving the power control command, the terminal adjusts the transmitting power according to the predefined step length. The target value of the SIR of the traffic channel is then adjusted by the outer loop power control process according to the quality of the communication link.
However, in the above description of power control, how to determine the step size of power adjustment is a difficult problem, if the step size is too small, the power control effect is not enough to overcome the rapid change of environment, for example, in case of deep slow fading, the change of path loss can even reach more than 20-30dB, and if the step size is too large, the system will have unstable effect without too large change of power, thereby increasing the interference in the system and affecting the capacity of the CDMA system. In addition, in the process of one communication connection, the environment of the user is in dynamic change, and the best power control effect in the whole communication process cannot be guaranteed by adopting a fixed step length. In the existing practical CDMA system, a fixed step power control method is basically used, so the above-mentioned drawbacks are common, and the adaptive variable step power control method can be used to compensate the above-mentioned drawbacks according to the environmental requirements.
Some proposed power control algorithms with multiple step sizes compare the SIR value of the received signal with the SIR target value at the base station end to obtain the difference between them and determine the step size of the uplink inner loop power control according to the size of the difference. Such an algorithm can be described in the following way: defining: gamma-SIRmeasure-SIRtarget|。if 0＜γ＜δ1Stepnew＝Δ1(e.g., 1dB)
δ1＜γ＜δ2Stepnew＝Δ2(e.g., 2dB)
δ2＜γ＜δ3Stepnew＝Δ3(e.g., 3dB)
However, if such a scheme is adopted, the decision end for triggering step adjustment and the execution end for adjusting transmission power are respectively in two entities (terminal and base station), and the base station needs to send not only the power control command but also the power control step adjustment indication, which will increase the burden of the air interface and its reliability is affected by the channel environment.
In Frequency Division Duplex (FDD) CDMA systems, the transmission characteristics are quite different since the uplink and downlink use different frequencies. Therefore, the FDD system can only use open-loop control as a rough power estimation for initial access of the terminal, and it is difficult to use the measured result of the downlink signal in the closed-loop power control process.
In Time Division Duplex (TDD) CDMA, the uplink and downlink transmit signals at the same frequency and are only used in time division, and the time interval between the uplink and downlink can be ensured to be small enough by the design of the frame structure, so that the ue can approximately consider that its radio environment does not change even in the case of high-speed movement. Thus, the uplink and downlink transmission characteristics of the TDD mobile communication system can be basically considered to be consistent. Therefore, it is desirable to utilize the characteristic that the power control of the TDD mobile communication system can utilize the consistency of uplink and downlink transmissions.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned disadvantages of the prior art and providing a power control method and apparatus for a time division duplex code division multiple access (TDD CDMA) system, wherein the step size of power control can be dynamically adjusted according to the environment.
The invention provides a method for controlling the power of a time division duplex code division multiple access (TDD CDMA) system, which comprises the following steps:
receiving a signal transmitted by the other party to acquire the parameter of the signal;
obtaining a currently used transmit power (Ppresent);
obtaining the transmission power estimated value (P) after the weighting smoothing of the current uplink transmission power according to the received signal transmitted by the other partyTX)；
Calculating the absolute value of the difference between the current used transmitting power (Pprent) and the estimated value of the transmitting power weighted and smoothed by the current uplink transmitting power, wherein delta is | PTX-Ppresent|；
Determining said Δ ═ PTXAnd determining the step size according to the preset power adjustment step size corresponding to the interval in which the delta is located.
Optionally, the determining the Δ ═ PTX-in which predetermined interval the value of ppevent | is located, and the step of determining the step size according to the predetermined power adjustment step size corresponding to the interval in which Δ is located comprises:
determining said Δ ═ PTX-whether the value of Ppresent is greater than a first predetermined threshold value (δ)1) Is smaller than a second predetermined threshold value (delta)2)；
If said delta is greater than a first predetermined threshold value (delta)1) Increasing the power adjustment step length by one step length grade;
if said delta is less than a second predetermined threshold value (delta)2) Reducing the power adjustment step length by one step length grade;
if said delta is at a first predetermined threshold value (delta)1) And a second predetermined threshold value (delta)2) In between, the step length is not adjusted;
wherein, the delta1Not less than delta2。
Preferably, the method further comprises the step of: and extracting the TPC command sent by the opposite side, determining whether power adjustment should be carried out, if adjustment is needed, adjusting the power according to the determined step length, and then transmitting a signal to the opposite side through a wireless channel.
Optionally, the method further comprises the step of:
the signal-to-interference ratio (SIR) of an uplink traffic channel is detected at predetermined time intervals,
comparing the signal-to-interference ratio with a predetermined target value;
if the signal to interference ratio is higher than the target value, reducing the transmitting power;
otherwise, the transmitting power is increased.
Preferably, wherein, the obtaining of the transmission power estimated value P after weighting and smoothing of the current uplink transmission powerTXComprises the following steps:
acquiring open loop estimated transmitting power of a service channel according to the received signal transmitted by the opposite side;
taking out the last estimated transmission power value (P)TX_last)；
Obtaining the estimated value (P) of the transmission power after the weighting and smoothing of the current uplink transmission power by using a preset smoothing factorTX)。
Optionally, the step of obtaining the open loop estimated transmit power of the traffic channel includes:
obtaining signal fading on a beacon channel and desired received Power (PRX) for a traffic channelPDPCHdes)；
Wherein the desired obtained received Power (PRX)PDPCHdes) Satisfies the following formula:
(SIR)DPCHrepresenting the received signal-to-noise ratio expected to be obtained on the channel used;
IPDPCHrepresenting the interference power on the used channel.
Preferably, the interference power on the used channel is obtained by: and the opposite side measures the interference power and broadcasts through a system message to obtain the latest interference power.
Optionally, the obtaining of the transmission power estimation value (P) after weighting and smoothing of the current uplink transmission power is performedTX) Satisfies the following formula:
PTX＝αPDPCH+(1-α)PTX_last (1)
wherein, PTX_lastIs the last estimated transmit power value; α is a smoothing factor;
PDPCHrepresents the open loop estimated transmit power of the traffic channel, satisfies equation (2)
PDPCH＝PRXPDPCHdes+PLoss (2)
Wherein, PLossObtaining signal fading on the beacon channel for the measurement;
PRXPDPCHdesindicating the received power expected to be achieved on that channel.
Preferably, the method further comprises the step of,
obtaining the current estimated path loss according to the received signal transmitted by the other party;
reading the path loss estimated a predetermined number of times before;
determining which of a predetermined plurality of intervals the current estimated path loss differs from the previously predetermined number of estimated path losses;
and determining the power adjustment step length according to the judged interval and/or the interval of the delta.
Optionally, the step of determining a power adjustment step size according to the determined interval and/or according to the interval in which Δ is located includes:
if the delta is larger than a first predetermined threshold value or if the gamma is larger than a third predetermined threshold value, the power adjustment step size is increased by a step size level;
if said Δ is less than a second predetermined threshold and if said γ is not greater than a third predetermined threshold, decreasing the power adjustment step size by a step size level;
if the two conditions are not met, the power adjustment step size is not changed.
The invention also provides a device for controlling the power of a time division duplex code division multiple access (TDD CDMA) system, which comprises:
the transceiver is used for receiving the signal transmitted by the other party to acquire the parameter of the signal and transmitting the signal to the other party;
a power measuring device obtaining a currently used transmit power (ppevent);
-storage means for storing a currently used transmission power value (ppevent) and a previous transmission power value;
a control and calculation device for obtaining the transmission power estimated value (P) weighted and smoothed by the current uplink transmission power according to the received signal transmitted by the other partyTX) (ii) a Calculating the absolute value of the difference between the current used transmitting power (Pprent) and the estimated value of the transmitting power weighted and smoothed by the current uplink transmitting power, wherein delta is | PTX-Ppresent|；
Determination means for determining that Δ ═ PTX-the value of Ppresent | is in that predetermined interval;
and the control and calculation device determines the step length according to the preset power adjustment step length corresponding to the interval in which the delta is positioned.
Optionally, the control and calculation apparatus further includes a loss obtaining apparatus, configured to obtain a current estimated path loss according to the received signal transmitted by the other party;
the storage means further stores path losses estimated a predetermined number of times before;
the control and calculation means further includes loss deviation judgment means for judging which of a predetermined plurality of intervals the difference between the current estimated path loss and the previously estimated path loss is in;
and the control and calculation device determines the power adjustment step length according to the judged interval and/or the interval where the delta is positioned.
By using the invention, the step length of the power adjustment can be dynamically changed in accordance with the environment. It can also be realized that the adjustment of the terminal (or base station) transmission power depends on the combination of the uplink (or downlink) closed-loop power control step size and the corresponding power control command.
Drawings
FIG. 1 shows a flow chart and a block diagram of an implementation of an open loop and closed loop combined power control method of a first preferred embodiment of the present invention;
FIG. 2 shows a flow chart and a block diagram of an implementation of an open loop and closed loop combined power control method of a second preferred embodiment of the present invention, wherein an auxiliary step size adjustment is added;
fig. 3 shows a flow chart and a block diagram of an implementation of the open loop and closed loop combined power control method of the third preferred embodiment of the present invention, wherein a hierarchical processing of the measured parameters is added.
Detailed Description
In a Time Division Duplex (TDD) CDMA system, the uplink and downlink transmit signals at the same frequency and are only used in time division, and the time interval between the uplink and downlink can be ensured to be small enough by the design of the frame structure, so that the ue can approximately consider that its radio environment does not change even in the case of high-speed movement within the interval between the uplink and downlink. Thus, the uplink and downlink transmission characteristics of the TDD mobile communication system can be basically considered to be consistent. On this premise, the method of open-loop power control can be used to estimate the transmission power that the user terminal should use, and compare it with the actual transmission power at the current moment, and then use the difference as the basis of the adjustment of the step length of closed-loop power control. The network only needs to broadcast the measured value of the uplink time slot interference to the cells periodically. When the algorithm realizes the adjustment of the uplink power control step length at the terminal, the adjustment of the power control step length is completely realized in the user terminal, the signaling overhead on an air interface required by the adjustment at the network end is avoided, and the method has high realizability. (meanwhile, the algorithm directly utilizes the estimated value of the path loss as the basis for adjusting the power control step length, so that the method is intuitive and effective), if the base station end needs to know the power control step length used by the terminal, the terminal can send the currently used step length value to the base station end through an uplink signaling.
If the algorithm realizes the adjustment of the downlink power control step length at the base station end, the terminal is required to periodically report the path loss value obtained by measuring the downlink pilot signal and the interference information in the time slot of the downlink signal.
In CDMA systems, a closed loop power control procedure is necessary that allows the terminal (or base station) to meet the associated channel quality requirements with as little power as possible. Closed loop power control usually reaches the balance of signal to interference ratio SIR through the interaction process between the base station and the terminal with a certain adjustment step size. In the design of CDMA system, there is generally a beacon channel in the downlink direction, and the transmission power of the beacon channel is broadcasted through system messages to the whole cell area for the UE (user equipment) to refer to when performing uplink open-loop power control. In TD-SCDMA systems, which have been standardized by 3GPP (third generation mobile communication standards organization), especially the special time slot of downlink pilot (DwPTS) or the Primary Common Control Physical Channel (PCCPCH) is used for beacon channel purposes. Because the uplink and the downlink of the TDD system use the same frequency, the open-loop power control of the system can be very accurate for a single UE, however, the direct application of the open-loop power control often results in too large amplitude of the transmit power adjustment, which degrades the stability of the whole system. Therefore, the principle of open loop power control can be utilized in the power control of the uplink (or downlink) link, the transmission power which the uplink (downlink) signal should have is estimated by combining the downlink pilot signal of which the transmission power is known and the interference information of the current time slot, and the step length of the closed loop power control is adaptively adjusted according to the information, so as to perform stable and accurate transmission power adjustment, thereby achieving the optimized power control effect.
The algorithm in the invention is described below by taking the application of the invention to uplink power control as an example. The algorithm can be applied to the base station side as well. The characteristic of the method for controlling the uplink power is that the step length of the terminal power adjustment is divided into at least 2 or more levels (in the embodiment of the invention, the step length is divided into 5 levels which are respectively 0.5dB, 0.8dB, 1dB, 1.2dB and 1.5dB), the adjustment of the closed loop power control step length is triggered by using the information obtained by measuring the downlink signal, and the decision of the step length adjustment and the execution of the transmission power adjustment are all completed at the terminal.
According to the open-loop power control principle, the terminal carries out weighting smoothing on the current open-loop transmission power estimated value and the last open-loop transmission power estimated value to obtain a power value P to be transmittedTX. Will PTXAnd the transmission power value P of the current terminalpresentComparing to obtain absolute value of power difference delta ═ PTX-Ppresent |. Meanwhile, the terminal calculates the path loss P of the received signal by using the pilot signalLossAnd the average of the estimated values of the most recent M (M is 2 in the embodiment of the present invention) times of path lossTo carry outComparing, recording the absolute value of the difference between the two values as <math> <mrow> <mi>γ</mi> <mo>=</mo> <mo>|</mo> <msub> <mi>P</mi> <mi>Loss</mi> </msub> <mo>-</mo> <mover> <msub> <mi>P</mi> <mi>M</mi> </msub> <mo>‾</mo> </mover> <mo>|</mo> <mo>.</mo> </mrow> </math>
The following describes 3 embodiments of the adaptive variable step size power control algorithm with reference to the drawings respectively:
fig. 1 shows a flow chart and a block diagram of an implementation of the open loop and closed loop combined power control method of the first preferred embodiment of the present invention.
Firstly, a terminal 100(UE) receives a signal transmitted by a base station 105 through a downlink wireless channel 110, and acquires parameters of the signal; and obtains the currently used transmit power Ppresent of the terminal 100;
in step 120, the estimated value P of the transmission power after weighted smoothing of the current uplink transmission power is estimatedTX：
PTX＝αPDPCH+(1-α)PTX_last (1)
Wherein P isTXThe estimated value of the transmission power after the weighting smoothing of the current uplink transmission power is obtained;
PTX_lastis the last estimated transmit power PTXA value; α is a smoothing factor;
PDPCHthe open-loop estimated transmit power, which represents the traffic channel, can be calculated with reference to equation (2)
PDPCH＝PRXPDPCHdes+PLoss (2)
Wherein,
PLossobtaining signal fading on the beacon channel for the measurement; in TD-SCDMA mobile communication
In the system, the special time slot or the main public common of the downlink pilot frequency (DwPTS) is used
The control physical channel (PCCPCH) is used for beacon channel purposes.
PRXPDPCHdesThe received power expected to be obtained on the channel is expressed by referring to the formula
(3) Computing
(SIR)DPCHRepresenting the desired received signal-to-noise ratio on the channel;
IPDPCHrepresenting the interference power on this channel, is measured by the base station 105 and broadcast in the cell area via a system message, and the user terminal 100(UE) is subject to the latest interference power update.
In step 125, the absolute value of the difference between the currently used transmit power ppresource of the terminal 100 and the estimated transmit power value weighted and smoothed by the current uplink transmit power is calculated, where Δ ═ PTX-Ppresent|；
In step 130, it is determined that Δ ═ PTX-whether Ppresent | is greater than a first predetermined threshold value δ1Is smaller than a second predetermined threshold value delta2；
If this delta is greater than a first predetermined threshold value delta1(in the embodiment of the present invention)
In the range of 1-1.5 dB), which indicates the current transmission power and the open loop power
If the control estimates that the required transmit powers differ significantly, the power of the terminal is determined in step 135
The rate adjustment step length is increased by one step length grade;
if this delta is smaller than a second predetermined threshold value delta2(in the embodiment of the present invention)
In the range of 0.2-0.5 dB), which indicates the current transmit power and the open loop power
If the difference between the required transmit powers of the rate control estimates is small, the terminal will be configured in step 135
The power adjustment step size is decreased by one step size level.
If this delta is at a first predetermined threshold value delta1And a second predetermined threshold value delta2In-line with the above
This illustrates the current transmit power and the required transmit power estimated by open loop power control
If the rate differs by a power adjustment step size appropriate for the terminal, the step size is not adjusted in step 135.
In practical application, the 2 conditions for triggering step adjustment are judged according to the numbering sequence. Here, the power difference threshold value δ1≥δ2。
In step 145, the terminal 100 extracts a TPC (Transmit power control) command, determines whether power adjustment should be performed, adjusts power according to the step determined in step 135 in step 140 if adjustment is necessary, and then transmits a signal to the base station (Node B)105 through the uplink radio channel 115.
And after the power control step length adopted by the terminal is adjusted, the step length value is sent to the base station end through an uplink signaling. In the uplink power control process, the base station and the terminal still perform according to the current standard. The base station estimates the received terminal SIR (signal to interference ratio) at a frequency of up to 200Hz and compares it with a target SIR. And when the measured SIR is smaller than the target SIR, the terminal sends a TPC-1 instruction to the terminal in the next 5ms subframe and commands the terminal to increase the transmission power. After receiving the TPC command, the terminal calculates the determined step length for the latest time according to the method of the invention to adjust the transmitting power. In order for a terminal to estimate the power it should transmit, the base station must also periodically make uplink timeslot ISCP measurements and periodically broadcast to the cells via system messages. The terminal in the connected mode should monitor the system broadcast message at the same time, and when receiving the uplink timeslot ISCP (Interference signal code rate) parameter, the internal stored value should be updated accordingly.
When the scheme is used for simulation, under the condition of the same service intensity, compared with a fixed step length algorithm (the step length adopts 1dB), the call drop rate (1%) can be reduced. The call drop criteria employed here are: if the signal-to-interference ratio SIR value of the received signal is continuously lower than the target SIR value for 140ms, the call drop of the terminal is judged.
Fig. 2 shows a flow chart and a block diagram of an implementation of the open loop and closed loop combined power control method of the second preferred embodiment of the present invention, wherein an auxiliary step size adjustment is added. For simplicity of description, the same portions as those of fig. 1 are not described in detail herein, and the portions different from those of fig. 1 are mainly described herein.
Firstly, a terminal 100(UE) receives a signal transmitted by a base station 105 through a downlink wireless channel 110, and acquires parameters of the signal; and obtains the currently used transmit power Ppresent of the terminal 100; and a beacon channel signal for calculating a received signal path loss P using the beacon channel signalLoss
In step 120, the estimated value P of the transmission power after weighted smoothing of the current uplink transmission power is estimatedTX；
Step 205 is a step of assisting step size adjustment, wherein, in step 210, an average of the estimated values of the path loss of the last two (possibly more) times is obtained <math> <mrow> <mover> <msub> <mi>P</mi> <mi>M</mi> </msub> <mo>‾</mo> </mover> <mo>=</mo> <mfrac> <mn>1</mn> <mi>M</mi> </mfrac> <munderover> <mi>Σ</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>M</mi> </munderover> <msub> <mi>P</mi> <mi>i</mi> </msub> </mrow> </math>
Wherein, PiThe path loss measurement for the previous i times.
In step 130, it is determined that Δ ═ PTX-whether Ppresent | is greater than a first predetermined threshold value δ1Is smaller than a second predetermined threshold value delta2(ii) a And
at steps 220 and 225, calculations and determinations are made <math> <mrow> <mi>γ</mi> <mo>=</mo> <mo>|</mo> <msub> <mi>P</mi> <mi>Loss</mi> </msub> <mo>-</mo> <mover> <msub> <mi>P</mi> <mi>M</mi> </msub> <mo>‾</mo> </mover> <mo>|</mo> </mrow> </math> Whether or not it is greater than a third predetermined threshold value delta3；
If this delta is greater than a first predetermined threshold value delta1(in the embodiment of the present invention)
In the range of 0.5-1 dB), which indicates the current transmission power and the open loop power
Controlling the estimated required transmission power to be greatly different, or gamma is larger than a third predetermined threshold
The value delta3(in the embodiment of the present invention, the range is 0.5-1 dB) (illustrate the channel
A large change in environment), the power adjustment step size of the terminal is increased in step 135
Increasing one step level;
if this delta is smaller than a second predetermined threshold value delta2(in the embodiment of the present invention)
In the range of 0.2-0.5 dB), which indicates the current transmit power and the open loop power
The rate control estimates have a small difference in the required transmit power and gamma is no greater than a third predetermined gate
Limit value delta3(in the embodiment of the present invention, the range is 0.5 to 1dB) (description information
The environment has not changed significantly), the power of the terminal is adjusted in step 135
The length is decreased by one step level.
If this delta is at a first predetermined threshold value delta1And a second predetermined threshold value delta2In-line with the above
This illustrates the current transmit power and the required transmit power estimated by open loop power control
The difference between the rates is suitable for the power adjustment step length of the terminal, and gamma is not more than a third preset threshold value
δ3(in the embodiment of the present invention, the range is 0.5-1 dB) (illustrate the channel ring
Where no large change has occurred), the step size is not adjusted at step 135.
In practical application, the 2 conditions for triggering step adjustment are judged according to the numbering sequence. Here, the power difference threshold value δ1≥δ2。
In step 145, the terminal 100 extracts the TPC command, determines whether power adjustment should be made, and if adjustment is required, adjusts power according to the step size determined in step 135 in step 140, and then transmits a signal to the base station (Node B)105 through the uplink radio channel 115.
And after the power control step length adopted by the terminal is adjusted, the step length value is sent to the base station end through an uplink signaling. In the uplink power control process, the base station and the terminal still perform according to the current standard. The base station estimates the received terminal SIR at a frequency of up to 200Hz and compares it with the target SIR. And when the measured SIR is smaller than the target SIR, the terminal sends a TPC-1 instruction to the terminal in the next 5ms subframe and commands the terminal to increase the transmission power. After receiving the TPC command, the terminal calculates the determined step length for the latest time according to the method of the invention to adjust the transmitting power. In order for a terminal to estimate the power it should transmit, the base station must also periodically make uplink timeslot ISCP measurements and periodically broadcast to the cells via system messages. The terminal in the connected mode should simultaneously monitor the system broadcast message, and when receiving the uplink timeslot ISCP parameter, the internal stored value should be updated accordingly.
Fig. 3 shows a flow chart and a block diagram of an implementation of the open loop and closed loop combined power control method of the third preferred embodiment of the present invention, wherein a hierarchical processing of the measured parameters is added. For simplicity of description, the same portions as those of fig. 1 and 2 are not described in detail herein, and portions different from those of fig. 1 and 2 are mainly described herein.
In this embodiment, the measurement parameters Δ, γ are graded. Dividing delta into a plurality of intervals; and there is a one-to-one correspondence between each interval and step size level (in the embodiment, 3 intervals, respectively, σ1＝[0dB，2dB)；σ2＝[2dB，6dB)；σ3═ 6dB, infinity). The reference step lengths corresponding to the intervals are respectively: 0.5dB, 1dB, 1.5 dB). Dividing gamma into a plurality of intervals; and there is a one-to-one correspondence between each interval and step size level (in the embodiment, there are 3 intervals, respectively, α1＝[0dB，2dB)；α2＝[2dB，6dB)；α3═ 6dB, infinity). The reference step lengths corresponding to the intervals are respectively: 0.5dB, 1dB, 1.5 dB).
If it is determined in step 315 that Δ is within a certain range σnIf so, selecting a corresponding power adjustment step size delta P1;
if it is determined in step 310 that γ is within a certain interval αnIf so, selecting a corresponding power adjustment step size delta P2;
then, at step 320, Δ P ═ max (Δ P1, Δ P2) is selected as the step size of the actual power adjustment.
And after the power control step length adopted by the terminal is adjusted, the step length value is sent to the base station end through an uplink signaling. In the uplink power control process, the base station and the terminal still perform according to the current standard. The base station estimates the received terminal SIR at a frequency of up to 200Hz and compares it with the target SIR. And when the measured SIR is smaller than the target SIR, the terminal sends a TPC-1 instruction to the terminal in the next 5ms subframe and commands the terminal to increase the transmission power. After receiving the TPC command, the terminal calculates the determined step length for the latest time according to the method of the invention to adjust the transmitting power. In order for a terminal to estimate the power it should transmit, the base station must also periodically make uplink timeslot ISCP measurements and periodically broadcast to the cells via system messages. The terminal in the connected mode should simultaneously monitor the system broadcast message, and when receiving the uplink timeslot ISCP parameter, the internal stored value should be updated accordingly.
When the scheme is used for simulation, under the condition of the same service intensity, compared with a fixed step length algorithm (the step length adopts 1dB), the call drop rate (1%) can be reduced. The call drop criteria employed here are: if the signal-to-interference ratio SIR value of the received signal is continuously lower than the target SIR value for 140ms, the call drop of the terminal is judged.
Although in the embodiments, power control using TPC commands is described, in practice, the present invention may also perform power control without TPC commands.
In the present invention, a device for controlling power of a time division duplex code division multiple access (TDD CDMA) system includes:
the transceiver is used for receiving the signal transmitted by the other party to acquire the parameter of the signal and transmitting the signal to the other party;
the power measuring device is used for obtaining the currently used transmitting power Pprent;
a storage means for storing a currently used transmission power value Ppresent and a previous transmission power value;
a control and calculation device for obtaining the transmission power estimated value P after the weighting smoothing of the current uplink transmission power according to the received signal transmitted by the other partyTX(ii) a Calculating the absolute value of the difference between the current used transmission power Pprent and the transmission power estimated value after the current uplink transmission power weighting smoothing, wherein delta is equal to | PTX-Ppresent|；
Determination means for determining that Δ ═ PTX-the value of Ppresent | is in that predetermined interval;
the control and calculation device determines a step length according to a preset power adjustment step length corresponding to the interval in which the delta is positioned;
the control and calculation device further comprises a loss acquisition device, which is used for acquiring the current estimated path loss according to the received signal transmitted by the other party;
the storage means further stores path losses estimated a predetermined number of times before;
the control and calculation means further includes loss deviation judgment means for judging which of a predetermined plurality of intervals the difference between the current estimated path loss and the previously estimated path loss is in;
and the control and calculation device determines the power adjustment step length according to the judged interval and/or the interval where the delta is positioned.
While the present invention has been described with respect to the embodiments, those skilled in the art will appreciate that there are numerous variations and permutations of the present invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and modifications as fall within the true spirit of the invention.
Claims (12)
1. A method for power control of a time division duplex code division multiple access (TDD CDMA) system, comprising the steps of:
receiving a signal transmitted by the other party to acquire the parameter of the signal;
obtaining a currently used transmit power (Ppresent);
obtaining the transmission power estimated value (P) after the weighting smoothing of the current uplink transmission power according to the received signal transmitted by the other partyTX)；
Calculating the current used transmitting power (Pprent) and the current uplink transmitting power after weighted smoothingAbsolute value of difference of transmission power estimated value, delta ═ PTX-Ppresent|；
Determining said Δ ═ PTXAnd determining the step size according to the preset power adjustment step size corresponding to the interval in which the delta is located.
2. The method of claim 1, wherein said determining said Δ ═ PTX-in which predetermined interval the value of ppevent | is located, and the step of determining the step size according to the predetermined power adjustment step size corresponding to the interval in which Δ is located comprises:
determining said Δ ═ PTX-whether the value of Ppresent is greater than a first predetermined threshold value (δ)1) Is smaller than a second predetermined threshold value (delta)2) Said delta1Not less than delta2；
If said delta is greater than a first predetermined threshold value (delta)1) Increasing the power adjustment step length by one step length grade;
if said delta is less than a second predetermined threshold value (delta)2) Reducing the power adjustment step length by one step length grade;
if said delta is at a first predetermined threshold value (delta)1) And a second predetermined threshold value (delta)2) And the step length is not adjusted.
3. The method of claim 1, further comprising the steps of: and extracting the TPC command sent by the opposite side, determining whether power adjustment should be carried out, if adjustment is needed, adjusting the power according to the determined step length, and then transmitting a signal to the opposite side through a wireless channel.
4. The method according to one of claims 1 to 3, further comprising the step of:
the signal-to-interference ratio (SIR) of an uplink traffic channel is detected at predetermined time intervals,
comparing the signal-to-interference ratio with a predetermined target value;
if the signal to interference ratio is higher than the target value, reducing the transmitting power;
otherwise, the transmitting power is increased.
5. The method as claimed in claim 1, wherein the obtaining of the transmit power estimate P after weighted smoothing of the current uplink transmit powerTXComprises the following steps:
acquiring open loop estimated transmitting power of a service channel according to the received signal transmitted by the opposite side;
taking out the last estimated transmission power value (P)TX_last)；
Obtaining the estimated value (P) of the transmission power after the weighting and smoothing of the current uplink transmission power by using a preset smoothing factorTX)。
6. The method of claim 5, wherein the step of obtaining an open loop estimated transmit power for a traffic channel comprises:
obtaining signal fading on a beacon channel and desired received Power (PRX) for a traffic channelPDPCHdes)；
Wherein the desired obtained received Power (PRX)PDPCHdes) Satisfies the following formula:
(SIR)DPCHrepresenting the received signal-to-noise ratio expected to be obtained on the channel used;
IPDPCHrepresenting the interference power on the used channel.
7. The method of claim 6, wherein the interference power on the used channel is obtained by: the interference power of the uplink time slot is measured by the opposite side and is broadcasted to the cell through the system message; the interference power of the downlink time slot is measured by the other side and periodically reported to the receiving side.
8. The method of claim 6, wherein the obtaining of the transmit power estimate (P) weighted and smoothed by the current uplink transmit powerTX) Satisfies the following formula:
PTX＝αPDPCH+(1-α)PTX_last (1)
wherein, PTX_lastIs the last estimated transmit power value; α is a smoothing factor;
PDPCHrepresents the open loop estimated transmit power of the traffic channel, satisfies equation (2)
PDPCH＝PRXPDPCHdes+PLoss (2)
Wherein, PLossObtaining signal fading on the beacon channel for the measurement;
PRXPDPCHdesindicating the received power expected to be achieved on that channel.
9. The method of claim 1 or 2, further comprising the step of,
obtaining the current estimated path loss according to the received signal transmitted by the other party;
reading the path loss estimated a predetermined number of times before;
determining which of a predetermined plurality of intervals the current estimated path loss differs from the previously predetermined number of estimated path losses;
and determining the power adjustment step length according to the judged interval and/or the interval of the delta.
10. The method of claim 9, wherein the step of determining the power adjustment step size according to the determined interval and/or according to the interval in which the Δ is located comprises:
if the delta is larger than a first predetermined threshold value or if the gamma is larger than a third predetermined threshold value, the power adjustment step size is increased by a step size level;
if said Δ is less than a second predetermined threshold and if said γ is not greater than a third predetermined threshold, decreasing the power adjustment step size by a step size level;
if the two conditions are not met, the power adjustment step size is not changed.
11. An apparatus for power control of a time division duplex code division multiple access (TDD CDMA) system, comprising:
the transceiver is used for receiving the signal transmitted by the other party to acquire the parameter of the signal and transmitting the signal to the other party;
a power measuring device obtaining a currently used transmit power (ppevent);
-storage means for storing a currently used transmission power value (ppevent) and a previous transmission power value;
a control and calculation device for obtaining the transmission power estimated value (P) weighted and smoothed by the current uplink transmission power according to the received signal transmitted by the other partyTX) (ii) a Calculating the absolute value of the difference between the current used transmitting power (Pprent) and the estimated value of the transmitting power weighted and smoothed by the current uplink transmitting power, wherein delta is | PTX-Ppresent|；
Determination means for determining that Δ ═ PTX-the value of Ppresent | is in that predetermined interval;
and the control and calculation device determines the step length according to the preset power adjustment step length corresponding to the interval in which the delta is positioned.
12. The apparatus of claim 11, wherein,
the control and calculation device further comprises a loss acquisition device for acquiring the current estimated path loss according to the received signal transmitted by the other party;
the storage means further stores path losses estimated a predetermined number of times before;
the control and calculation means further includes loss deviation judgment means for judging which of a predetermined plurality of intervals the difference between the current estimated path loss and the previously estimated path loss is in;
and the control and calculation device determines the power adjustment step length according to the judged interval and/or the interval where the delta is positioned.
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| CN 03150365 CN1230016C (en) | 2003-07-25 | 2003-07-25 | TDD CDMA system power control method and device |
| PCT/CN2004/000867 WO2005011143A1 (en) | 2003-07-25 | 2004-07-26 | A power control method and apparatus for time division duplex code division multiple access system |
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| CN 03150365 CN1230016C (en) | 2003-07-25 | 2003-07-25 | TDD CDMA system power control method and device |
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| CN1230016C CN1230016C (en) | 2005-11-30 |
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- 2004-07-26 WO PCT/CN2004/000867 patent/WO2005011143A1/en active Application Filing
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| WO2005011143A1 (en) | 2005-02-03 |
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