CN100477561C - Reverse power control method and apparatus in a mobile communication system in which mobile station determines reverse data rate - Google Patents

Abstract

PURPOSE: A method and an apparatus for controlling reverse power in a wireless communication system in which a mobile terminal determines a reverse data transfer rate are provided to enhance reverse traffic reception performance of a base station by using a pilot signal with suitable transmission power. CONSTITUTION: A data transfer rate of the ith frame is 38.4kbps and a mobile terminal controls a data transfer rate up to 76.8kbps in the (i+1)th frame(310). After a base station receives the (i+1)th frame data, it recognizes that the mobile terminal uses the data transfer rate of 76.8kbps and determines that the mobile terminal has included additional pilot power required for channel compensation to a secondary pilot signal in the (i+1)th frame and then transmitted it(330). In the (i+2)th frame, the data transfer rate is controlled to be grater than that of the (i+1)th frame and the base station receives an RRI(Reverse Rate Indicator) that the mobile terminal has transmitted in the (i+2)th frame, recognizes that the secondary pilot signal has been transmitted, and uses it for channel compensation(340). In the (i+3)th frame, the data transfer rate is controlled to be smaller than that of the (i+2)th frame. In this case, the mobile terminal does not transmit the secondary pilot signal(350). In the (i+4)th frame, the data transfer rate is not changed compared to the (i+3)th frame. In this case, the base station does not require additional pilot power to receive the (i+4)th frame data, the mobile terminal does not transmit the secondary pilot signal, and the base station determines that the secondary pilot signal has not been transmitted(360).

Description

Determine backward power control method and equipment in the mobile communication system of reverse data rate at mobile radio station

Technical field

The present invention relates generally to backward power control method and equipment in a kind of mobile communication system, especially relate to a kind of like this method and apparatus, this method and apparatus is used in the mobile communication system of the data transfer rate of being determined reverse traffic channel by mobile radio station the transmitted power of reverse pilot (pilot) channel being controlled the reverse traffic receptivity that improves the base station with the data transfer rate in conjunction with reverse traffic channel.

Background technology

Typical mobile communication system can be divided into system that is used for the support voice service and the system that is used to support data, services.The typical case of this system comprises code division multiple access (CDMA) system.The cdma system of current only support voice service is abideed by interim standard-95 (IS-95).Because development communication technologies, mobile communication system has developed into the support high-speed data service.For example, first generation CDMA2000 (being called CDMA2000Ix) standard has been proposed, this standard is support voice service but also support data, services not only, and proposed IxEVDO (Evolution in Data Only) standard, this standard is according to the CDMA2000Ix system and by only supporting high-speed data service with all possible resource allocation to data, services.

Usually the signal transmission path in the mobile communication system is divided into forward path and reverse path, the link of this forward path on, this reverse path link on promptly from mobile radio station to the base station direction promptly from the base station that covers presumptive area (being called the sub-district) to the mobile radio station direction.In addition, mobile radio station can with base station exchange oppositely/forward data, it is in moving between cells simultaneously.

The signal that mobile radio station is sent on oppositely comprises reverse traffic channel (R-TRCH), Reverse Pilot Channel (R-PICH) and various control channel.This reverse traffic channel has variable data transfer rate according to the business that is sent on it.Reverse Pilot Channel transmits control signal carrying out channel compensation (promptly Traffic Channel being carried out the control of channel compensation and power), and this Reverse Pilot Channel has usually and the proportional transmission power level of data transfer rate of Traffic Channel.When the data transfer rate of reverse traffic channel became bigger, the base station must receive had more high-power pilot signal so that Traffic Channel is carried out level and smooth channel compensation.Here, " channel compensation " is meant such operation, and promptly base station receiver comes the influence of radio channel is compensated so that the received signal of demodulation according to received signal in this operation.

The received power of base station measurement Reverse Pilot Channel and noise ratio, and control the transmitted power of mobile radio station according to this measurement result.Mobile radio station is carried out this transmission power control, so that, keep the receptivity of reverse traffic channel simultaneously by making the minimum interference that is occurred during from the reverse signal of another mobile radio station a transmission effect of signals that mobile radio station sent make the reverse system maximum capacity.

The power control to reverse signal performed in the CDMA2000Ix mobile communication system can be divided into inner loop power control and exterior ring power control.In inner loop power control, the base station is sent to the transmitted power of mobile radio station with the control mobile radio station at each time slot (1.25ms) with power control bits (PCB), so that the reception pilot energy of the signal that mobile radio station sent and noise ratio Ep/Nt level off to power controlled target anchor point (setpoint).In exterior ring power control, each frame is all regulated anchor point.Exterior ring power control is used for keeping the receptivity of received Traffic Channel by regulating power controlled target anchor point.

In an illustrative methods that is being used for carrying out exterior ring power control, if mistake occurred in the received data on reverse traffic channel, anchor point increases xdB so, and if mistake do not occur, anchor point reduces x/ (1/FER-1) dB so.FER represents the desirable frame error rate in base station, and FER has the value between 0 and 1.For example, when x has 1 value and desirable error rate when being 0.01, if mistake occurred in the reception data on Traffic Channel, anchor point increases 1dB so, and otherwise, anchor point reduces 1/99dB.

Except exterior ring power control, another standard that is used for regulating the power controlled target anchor point of base station is the pilot reference level that is mapped to the data transfer rate that mobile radio station sends.In the CDMA2000Ix standard, define the pilot reference level shown in the following form 1 according to data transfer rate, and when mobile radio station had changed its reverse data rate, correspondingly power controlled target anchor point was regulated in the base station.

Form 1

Reverse data rate	The pilot reference level
		9.6kbps	0
19.2kbps	1
		38.4kbps	11
76.8kbps	21
		153.6kbps	36
307.2kbps	54

Shown in the form 1 is the defined pilot reference level that is mapped to the corresponding data rate in the CDMA2000Ix standard.The pilot reference level of each specified data transfer rate is to be the value of unit with 0.125dB in the form 1.For example, pilot reference level " x " is in fact represented x ÷ 8dB.

Fig. 1 is the schematic diagram of explanation performed Poewr control method in general CDMA2000Ix mobile communication system.With reference to figure 1, the base station commands mobile radio station is brought up to 76.8kbps (step 110) with the data transfer rate of (i+3) frame from 38.4kbps.In this case, the base station increases power controlled target anchor point so that increase reverse data rate from (i+3) frame.The level that power controlled target anchor point will increase is determined by pilot reference level specified in the form 1.Because in form 1 the pilot reference level of 38.4kbps be 11 and the pilot reference level of 76.8kbps be 21, so the base station has increased power controlled target anchor point and pilot reference level 11 and 12 between difference 10 corresponding 1.25 (=10/8) dB.Here, 1/8dB represents to regulate the least unit of power controlled target anchor point.

In the CDMA20001x mobile communication system, because regulate the data transfer rate of mobile radio station under the control of above-mentioned base station, therefore before mobile radio station changed its data transfer rate, this base station increased (to adjusted) or reduces (regulating) power controlled target anchor point downwards.Before in fact data transfer rate changed, power controlled target anchor point was regulated in the base station, and making like this is receptivity for the new data rate that keeps having changed.

Yet, different with the CDMA2000Ix mobile communication system, the 1xEVDO mobile communication system can not be regulated power controlled target anchor point before data transfer rate changes, because in the IxEVDO mobile communication system, the data transfer rate of the Traffic Channel that mobile radio station sent do not determined by the base station, but determine by mobile radio station.In this case, relevant power controlled target anchor point must be regulated in the base station after mobile radio station changes its data transfer rate.

Fig. 2 is the data transfer rate of the reverse traffic channel of explanation in general mobile communication system is regulated power controlled target anchor point when changing in the base station a schematic diagram.With reference to figure 2, mobile radio station the i frame use 38.4kbps data transfer rate, at (i+1) frame data transfer rate is increased to 76.8bkps (step 210), data transfer rate is increased to 153.6kbps (step 220) and keeps the data transfer rate of 153.6kbps at (i+3) frame at (i+2) frame.Compare with the data transfer rate of its previous frame, the data transfer rate of (i+1) frame and (i+2) frame has increased.Though compare with the data transfer rate of previous frame, mobile radio station has increased the data transfer rate of (i+1) frame in the manner described above, but receive reverse rate (the reverse rate indicator that sends with business datum at (i+1) frame through the RRI channel in the base station, RRI) afterwards, the increase of data transfer rate can be identified in the base station.

RRI is sent to the base station with the modulation scheme and the encoding scheme of the information relevant with data transfer rate (business control information), the number that sends the position, the business datum that sent in the same period (being frame).Mobile radio station sends the reasons are as follows of RRI.In the IxEVDO mobile communication system,, therefore must notify above-mentioned reverse traffic control information, so that receive the reverse traffic data to the base station because the data transfer rate of Traffic Channel determined but determined by mobile radio station by the base station.That is to say that after the base station received (i+1) frame data, mobile radio station can be detected in (i+1) business datum rate that frame sent in the base station.

In this case, after (i+1) frame passed through, the base station is considered at the data transfer rate of the employed Traffic Channel of (i+1) frame can regulate power controlled target anchor point.That is to say that the power controlled target anchor point that is used to control the power of (i+1) frame is not to be used for (i+1) frame (76.8kbps) but to be used for i frame (38.4kbps) or previous frame.

As (i+1) frame of Fig. 2, when when data transfer rate is not regulated power controlled target anchor point from the moment that 38.4kbps is increased to 76.8kbps, because following former thereby worsen the receptivity of Traffic Channel.Because use and the previous corresponding power controlled target of low data rate anchor point,, have the reverse pilot signal of suitable power not receiving on the base station with the data on the Traffic Channel that receives use and increased data transfer rate though data transfer rate has increased.Reverse pilot signal is used for Traffic Channel is carried out channel compensation, and in this case, the received power estimated value of channel compensation can not be guaranteed to be enough to be used in the base station, and because the received power of Traffic Channel also can not obtain desirable receptivity less than suitable level.

Even ought for example increase to 153.6kbps in (i+2) frame data rate, receive mobile radio station after (i+2) RRI that frame sent in the base station, this base station also can be provided with power controlled target anchor point to the 153.6kbps data transfer rate.Because with formerly frame or the employed data transfer rate of (i+2) frame are identical, so the base station utilizes and to be suitable for carrying out reverse power control with the power controlled target anchor point of 153.6kbps received frame at the employed data transfer rate of (i+3) frame.

Power of (i+2) frame in the comparison diagram 2 and the power of (i+3) frame it should be noted owing to following reason, can send (i+3) frame by higher power, though it has identical data transfer rate with (i+2) frame.That is to say that when being used for when the power controlled target anchor point of the transmitted power of (i+3) frame control mobile radio station is 153.6kbps, the power controlled target anchor point that is used in the transmitted power of (i+2) frame control mobile radio station is 76.8kbps.Therefore, the base station can receive signal on Traffic Channel and the pilot channel with enough received powers at (i+3) frame, but this base station can not receive signal on Traffic Channel and the pilot channel with enough received powers at (i+2) frame.

As mentioned above, in the IxEVDO mobile communication system of the data transfer rate of determining reverse traffic channel by mobile radio station, in the data transfer rate of considering reverse traffic channel is controlled power controlled target anchor point single frames delay (one-frame delay) has appearred.In this case, can not sufficient to guarantee be used to keep the base station received power of receptivity, have caused the deterioration of receptivity.

Summary of the invention

Therefore, one object of the present invention just provides a kind of backward power control method and equipment that improves the reverse traffic signal receptivity of the base station in the following mobile communication system, and mobile radio station is determined the data transfer rate of reverse traffic channel in described mobile communication system.

Another object of the present invention just provides a kind of method and apparatus that is used to regulate power controlled target anchor point, is used for mobile radio station therein and determines that the mobile communication system of data transfer rate of reverse traffic channel is by the reverse transmitted power of base stations control.

According to an aspect of the present invention, provide a kind of method of in mobile communication system, controlling the transmitted power of backward channel by mobile radio station.The method comprising the steps of: the data transfer rate of determining reverse traffic channel in each image duration; Compare first data transfer rate of present frame and second data transfer rate of previous frame; And if result's first data transfer rate is higher than second data transfer rate as a comparison, so the signal on signal on the main pilot channel and the less important pilot channel is sent to the base station to be used to the carrying out backward channel compensation, described main pilot channel has the corresponding transmitted power of pilot reference level with second data transfer rate.

According to a further aspect in the invention, provide a kind of in mobile communication system the method by the transmitted power of base stations control backward channel.The method comprising the steps of: be received on the oppositely main pilot channel that sends each image duration signal and according to the increase of the reverse data rate of mobile radio station and the signal on the less important pilot channel that selectivity sends; And if from mobile radio station receive signal on the main pilot channel and the signal on the less important pilot channel both, utilize the received power of pilot channel to come the signal on the reverse traffic channel is carried out channel compensation so.

A kind of mobile radio station transmitting apparatus of transmitted power of the backward channel that is used for controlling mobile communication system is provided according to a further aspect of the invention.This equipment comprises: addressable part is used for the signal on reverse rate (RRI) channel of the reverse data that sends through reverse traffic channel and expression reverse data rate is carried out chnnel coding; And power controller, be used to receive increase according to the reverse data rate of signal on the signal on the less important pilot channel of coded reverse data and the transmission of the selected property of RRI channel signal, the oppositely main pilot channel and mobile radio station, compare first data transfer rate of present frame and second data transfer rate of previous frame, and the transmission power gain of regulating input signal according to comparative result.

According to a further aspect of the invention, provide a kind of being used in the mobile communication system of determining reverse data rate by mobile radio station to control the base station receiver equipment of the transmitted power of backward channel.This equipment comprises: first channel estimator is used to utilize signal on the main pilot channel to come the signal from the received reverse rate that comprises the reverse traffic control information (RRI) channel of mobile radio station is carried out channel compensation; Decoder is used for decoding from the business control information of channel estimator output; Power control anchor point controller is used for to be mobile radio station power controlling controlled target anchor point according to business control information; The power control bits generator is used for producing the power control bits that will send to mobile radio station according to power controlled target anchor point; Traffic Channel is estimated controller, is used to utilize from the business control information of this decoder output determine whether reverse traffic channel is carried out channel compensation; And the second channel estimator, be used under the control of Traffic Channel estimation controller, reverse traffic channel being carried out channel compensation.

Description of drawings

In conjunction with the accompanying drawings, what may be obvious that from following detailed description draws above-mentioned and other purpose, feature and advantage of the present invention, in the accompanying drawings:

Fig. 1 is the schematic diagram of explanation performed Poewr control method in general CDMA2000Ix mobile communication system;

Fig. 2 is that the data transfer rate of the reverse traffic channel of explanation in general mobile communication system is regulated the schematic diagram of the process of power controlled target anchor point when changing in the base station;

Fig. 3 is backward power control method performed in the mobile communication system of reverse data rate is determined in explanation according to the mobile radio station therein of the embodiment of the invention a schematic diagram;

Fig. 4 is explanation according to the flow chart of process that is used to determine whether the transmitted power that sends less important pilot signal and determined less important pilot signal by mobile radio station of the embodiment of the invention;

What Fig. 5 was explanation according to the embodiment of the invention determines the flow chart of process of reverse power control target localization point and execution channel compensation by the base station;

Fig. 6 illustrates that in accordance with another embodiment of the present invention mobile radio station therein determines the schematic diagram of backward power control method performed in the mobile communication system of reverse data rate;

Fig. 7 illustrates in accordance with another embodiment of the present invention the flow chart of process of being determined the transmitted power of RRI channel by mobile radio station;

Fig. 8 illustrates the flow chart of determining reverse power control target localization point by the base station in accordance with another embodiment of the present invention and carrying out the process of channel compensation;

Fig. 9 be the explanation according to the present invention another embodiment at the schematic diagram of determining backward power control method performed in the mobile communication system of reverse data rate by mobile radio station or base station;

Figure 10 is the flow chart of the process that is used for definite reverse power control target localization point and execution channel compensation of explanation another embodiment according to the present invention;

Figure 11 is the block diagram of explanation according to the internal structure of the mobile radio station transmitter that backward power control method was applied to of the embodiment of the invention; And

Figure 12 is the block diagram of explanation according to the structure of the base station receiver that backward power control method was applied to of the embodiment of the invention.

Embodiment

With reference to the accompanying drawings some preferred embodiments of the present invention are described in detail.In the following description, omitted for brevity related here known function and structure have been elaborated.

The invention provides a kind of like this method, this method mobile radio station is therein determined the transmitted power using one or two pilot channel and regulate each pilot channel in the 1xEVDO mobile communication system of reverse data rate.Two pilot signals that mobile radio station sent are divided into main pilot signal and less important pilot signal.Main pilot signal is used in the base station, and power is controlled and the execution channel estimating so that reverse signal is carried out, and the less important pilot signal of the use of base station limits is to carry out channel estimating to reverse signal.

Fig. 3 is backward power control method performed in the mobile communication system of reverse data rate is determined in explanation according to the mobile radio station therein of the embodiment of the invention a schematic diagram.Received power and comparison measured received power and base station itself the set power controlled target anchor point of base station by only measuring main pilot signal carried out power control.That is to say that the received power of less important pilot signal is not measured in the base station in the process of carrying out power control.

Data transfer rate with reference to figure 3, the i frames is 38.4kbps, and mobile radio station increases to 76.8kbps (step 310) at (i+1) frame with data transfer rate.When data transfer rate increases by this way, consider and to postpone to regulate the power controlled target anchor point of base station with single frames that mobile radio station compensates necessary secondary power with the execution efficient channel and sends less important pilot signal (step 320).Less important pilot signal is set to the base station and receives the corresponding power level of difference between necessary total pilot power of (i+1) frame and the main pilot signal power with 76.8kbps.

If the data transfer rate that has used 76.8bkps is determined in the base station after receiving (i+1) frame data, the data transfer rate of described 76.8bkps is greater than the data transfer rate of employed 38.4kbps when mobile radio station sends the i frame, and the base station is determined mobile radio station and sent less important pilot signal (step 330) to carry out the necessary additional pilots power of channel compensation at (i+1) frame so.

The data transfer rate that also makes (i+2) frame increases to some extent than the data transfer rate of (i+1) frame.In this case, mobile radio station also carries out the necessary additional pilots power of channel compensation with the base station and sends less important pilot signal, and receive mobile radio station after (i+2) RRI that frame sent in the base station, the increase of determining owing to data transfer rate has sent less important pilot signal, and the RRI that receives is used for channel compensation (step 340).

The data transfer rate of (i+3) frame decreases than the data transfer rate of (i+2) frame or previous frame.After this in receiving the process of (i+3) frame data, the base station does not need the pilot power that adds except the pilot power of (i+2) frame.Therefore, when the such current data rate shown in (i+3) frame decreased than past data rate, mobile radio station did not send less important pilot signal (step 350).In addition, decrease if the data transfer rate of knowing Traffic Channel is examined according to RRI in the base station, the base station is determined and is not sent less important pilot signal so.

The data transfer rate of (i+4) frame and the data transfer rate of (i+3) frame or previous frame do not change.In this case, the base station does not need additional pilots power in receiving the process of (i+4) frame data, and consider frame data data transfer rate reduction and reduce power controlled target anchor point.Even when the such current data rate shown in (i+4) frame is identical with the past data rate, mobile radio station does not send less important pilot signal yet.In addition, if the base station remains unchanged according to the data transfer rate that RRI determines Traffic Channel, the base station is also determined and is not sent less important pilot signal (step 360) so.

Determine the transmitted power of Traffic Channel according to the transmitted power of the data transfer rate of Traffic Channel and main pilot signal and less important pilot signal.When Fig. 3 (i+1) and the such current data rate shown in (i+2) frame increase to some extent than past data rate, determine the transmitted power of the Traffic Channel that mobile radio station sent by following equation:

$P_{\mathrm{TRCH}}=(P_{\mathrm{pp}}+P_{\mathrm{sp}})\×{10}^{T{\mathrm{RR}}_{\mathrm{RATE}}/10}.........\left(1\right)$

P in equation (1) _TRCHThe transmitted power of expression Traffic Channel, P _PpThe transmitted power of representing main pilot channel, and P _SpThe transmitted power of representing less important pilot channel.In addition, TPR _RATEThe professional ratio (the perhaps ratio of Traffic Channel transmitted power and the transmitted power of pilot channel) with pilot power of expression, and for each data transfer rate unique presetting.TPR _RATEBe to be the value of unit description with dB.

When Fig. 3 (i+3) and the such current data rate shown in (i+4) frame do not increase than past data rate, determine the transmitted power of the Traffic Channel that mobile radio station sent so by following equation:

$P_{\mathrm{TRCH}}=P_{\mathrm{pp}}\×{10}^{{\mathrm{TPR}}_{\mathrm{RATE}}/10}.........\left(2\right)$

The transmitted power of RRI channel is based on the data transfer rate of Traffic Channel and all is the main pilot signal that sent and the transmitted power of less important pilot signal in the section at one time.When Fig. 3 (i+1) and the such current data rate shown in (i+2) frame increase to some extent than past data rate, determine the transmitted power of the RRI channel that mobile radio station sent by following equation:

$P_{\mathrm{RRI}}=(P_{\mathrm{pp}}+P_{\mathrm{sp}})\×{10}^{{\mathrm{TPR}}_{\mathrm{RRI}}/10}.........\left(3\right)$

In equation (3), P _RRIThe transmitted power of expression RRI channel, and TPR _RRIThe ratio of expression RRI and pilot power (or ratio of the transmitted power of RRI channel and total transmitted power of pilot channel), and P _RRIAnd TPR _RRIAll be that data transfer rate according to Traffic Channel sets in advance.TPR _RRIBe to be the value of unit description with dB.

When Fig. 3 (i+3) and the such current data rate shown in (i+4) frame do not increase than past data rate, determine the transmitted power of the RRI channel that mobile radio station sent by following equation:

$P_{\mathrm{RRI}}=P_{\mathrm{pp}}\×{10}^{{\mathrm{TPR}}_{\mathrm{RRI}}/10}.........\left(4\right)$

Fig. 4 determining whether to send less important pilot signal and determining the flow chart of process of the transmitted power of less important pilot signal that be explanation according to the embodiment of the invention by mobile radio station.With reference to figure 4, in step 410, mobile radio station is set to Rate at the data transfer rate of i frame Traffic Channel _iIn step 420, the data transfer rate of mobile radio station (i+1) frame is set to Rate _I+1In step 430, mobile radio station is the data transfer rate Rate of the Traffic Channel of i frame relatively _iData transfer rate Rate with (i+1) frame _I+iIf the data transfer rate Rate of (i+1) frame _I+iData transfer rate Rate greater than previous frame _i, mobile radio station is determined to send less important pilot signal at (i+1) frame in step 440 so, and after this passes through to determine the less important pilot tone of (i+1) frame and the transmitted power of recently determining less important pilot signal of main pilot power in step 450.

Determine that the transmitted power of less important pilot signal is so that the base station can obtain to be enough to be used in total pilot reception power of data transfer rate of reverse data that the base station receives the data transfer rate of (i+1) frame." total pilot reception power " is meant the main pilot signal that the base station is received and the transmitted power sum of less important pilot signal.The transmitted power of less important pilot signal is defined as Rate _iPilot reference level and Rate _I+1The pilot reference level between difference, and can calculate by following equation:

$P_{\mathrm{sp}}=P_{\mathrm{pp}}\×\{{10}^{({\mathrm{PREF}}_{i+1}-{\mathrm{PREF}}_i)/80}-1\}.........\left(5\right)$

In equation (5), PREF _iAnd PREF _I+1Expression is used to send the pilot reference level of the data transfer rate of i frame and (i+1) frame respectively, and PREF _iAnd PREF _I+1Have with dB is the value of unit.The pilot reference level is based on as in conjunction with form 1 described 0.125dB scale.

After the transmitted power of having calculated less important pilot signal, mobile radio station calculates the so employed Traffic Channel of identical period of (i+1) in sight frame, RRI channel, and the transmitted power of other channel in step 460, so that have predetermined ratio in each total transmitted power of transmitted power and main pilot tone and less important pilot tone of (i+1) Traffic Channel that frame sent and RRI channel signal.The transmitted power that can utilize equation (1) and equation (2) to come computing service channel, RRI channel and other channel.

Yet, if determine the data transfer rate Rate of (i+1) frame in step 430 _I+1The data transfer rate Rate that is less than or equal to previous frame _i, mobile radio station is determined at (i+1) frame in step 470 and is not sent less important pilot signal so.After this, in step 480, mobile radio station is ended (suspend) transmission to less important pilot signal, this means that the less important pilot tone and the ratio (perhaps less important pilot signal compares with the transmitted power of main pilot signal) of main pilot power are 0.In step 490, mobile radio station calculates at the Traffic Channel that the identical period sent, RRI channel, reaches the transmitted power of other channel, so that have predetermined ratio in the transmitted power of (i+1) each traffic channel signal that frame sent and RRI channel signal and total transmitted power of main pilot tone and less important pilot tone.Can utilize equation (2) and equation (4) to come computing service channel, RRI channel, and the transmitted power of other channel.

What Fig. 5 was explanation according to the embodiment of the invention determines the flow chart of process of reverse power control target localization point and execution channel compensation by the base station.With reference to figure 5, in step 510, the base station receive mobile radio station at the i frame with data transfer rate Rate _iThe business datum that is sent.In step 520, the base station is come carrying out channel compensation and the pilot signal of channel compensation is decoded data rate detection at the received RRI of (i+1) frame by utilizing a pilot signal.In step 530, the base station is the data transfer rate Rate of (i+1) frame relatively _I+1Data transfer rate Rate with previous frame _iIf Rate _I+1Greater than Rate _i, the base station receives (i+1) frame data and after this increases the power controlled target anchor point of (i+2) frame in step 540 so.Come definite power controlled target anchor point that is increased by equation (6):

$\mathrm{Setpoin}{t}_{i+2}={\mathrm{Setpoint}}_{i+1}\×{10}^{({\mathrm{PREF}}_{i+1}-{\mathrm{PREF}}_i)/80}.........\left(6\right)$

In equation (6), Setpoint _I+2And Setpoint _I+1Represent that respectively the base station carries out power at (i+2) frame and (i+1) frame and control employed power controlled target anchor point.In addition, PREF _I+1And PREF _iRepresent the pilot reference level of (i+1) frame and i frame respectively, and to have with dB be the value of unit.The pilot reference level is as the multiple in conjunction with form 1 described 0.125dB.According to equation (6), the base station is determined the power controlled target anchor point of (i+2) frame respectively at the data transfer rate of i frame and (i+1) frame transmission data according to mobile radio station.For example, if supposition uses data transfer rate and this data transfer rate of 38.4kbps to increase to 153.6kbps at (i+1) frame at the i frame, the base station increases power controlled target anchor point 3.125dB (=(36-11) ÷ 8) or increases by 2.0535 times so.

After increasing power controlled target anchor point, the base station utilizes main pilot signal and less important pilot signal in step 550, and both come to carry out channel compensation at (i+1) frame.As mentioned above, because the frame that increases at data transfer rate sends less important pilot signal, so by utilizing less important pilot signal to improve the channel compensation performance.

When main pilot signal and less important pilot signal were used for channel compensation, main pilot signal and less important pilot signal must be synthesized in the base station.Synthetic (MRC) synthesizes main pilot signal and less important pilot signal by maximum ratio, and in the MRC building-up process, be defined as with the transmission power value of main pilot signal and less important pilot signal the gain of multiplying each other with main pilot signal and less important pilot signal separately proportional.For example, if the transmitted power ratio of main pilot signal and less important pilot signal is a: b makes main pilot signal multiply by gain " a " so and makes less important pilot signal multiply by gain " b ".

Return Fig. 5 once more, if determine mobile radio station at the employed data transfer rate Rate of (i+1) frame in step 530 _I+1Equal the data transfer rate Rate of previous frame _i, the base station keeps the power controlled target anchor point of (i+2) frame to equate with the power controlled target anchor point of (i+1) frame in step 560 so.After this, in step 570, the base station only utilizes main pilot signal that the Traffic Channel of (i+1) frame is carried out channel compensation.

At last, if determine mobile radio station at the employed data transfer rate Rate of (i+1) frame in step 530 _I+1Less than data transfer rate Rate _i, the base station power controlled target anchor point that makes (i+2) frame in step 580 decreases than the power controlled target anchor point of (i+1) frame so.After this, in step 590, the base station only utilizes main pilot signal to come the Traffic Channel of (i+1) frame is carried out channel compensation.Determine the power controlled target anchor point that reduced by following equation:

${\mathrm{Setpoint}}_{i+2}={\mathrm{Setpoint}}_{i+1}\×{10}^{({\mathrm{PREF}}_{i+1}-{\mathrm{PREF}}_i)/80}.........\left(7\right)$

As shown in Figure 5, after the data transfer rate of respective frame was detected in the base station, the base station can be examined and know and have less important pilot signal.So that when carrying out inner loop power control, can not need additional single frames to postpone to control when using less important pilot signal with exempting from, cause the deterioration of performance to be used for power.Therefore, main pilot signal is only used in the base station in the process of carrying out inner loop power control.The base station is only measured main pilot signal, more measured main pilot signal and power controlled target anchor point and is after this ordered mobile radio station to increase or reduce its transmitted power according to comparative result.

Fig. 6 illustrates that in accordance with another embodiment of the present invention mobile radio station therein determines the schematic diagram of backward power control method performed in the mobile communication system of reverse data rate.Embodiments of the invention are another methods that are used to solve following problems, and described problem is promptly owing to the single frames of power controlled target anchor point postpones the received power of base station is become less than suitable level.

With reference to figure 6, mobile radio station does not send less important pilot signal when the frame that data transfer rate increases to some extent than the data transfer rate of previous frame.For example, the mobile radio station data transfer rate that makes (i+1) frame increases (step 610) to some extent than the data transfer rate of i frame or previous frame.At (i+1) frame, mobile radio station increases the amount of transmit power of the transmitted power of RRI as employed less important pilot signal in Fig. 3, and does not in fact send less important pilot signal (step 620).After this base station receives the RRI of (i+1) frame and increases the power controlled target anchor point (step 630) of (i+2) frame according to this RRI.

At (i+2) frame, mobile radio station makes this data transfer rate increase to some extent than the data transfer rate of (i+1) frame or previous frame, and increases required total pilot power of transmitted power (i+2) frame of RRI and the difference (step 640) between the employed total transmitted power of frame formerly.

In another case, the data transfer rate that mobile radio station makes (i+3) frame reduces (step 650) to some extent than the data transfer rate of (i+2) frame or previous frame, and only uses initial employed power and do not increase the transmitted power of RRI.

When the such current data speed ratio past data rate shown in (i+1) frame and (i+2) frame increases to some extent, determine the transmitted power of RRI channel by following equation:

$P_{\mathrm{RRI}}=P_{\mathrm{pp}}\×\{{10}^{\mathrm{TP}{R}_{\mathrm{RRI}}/10}+{10}^{({\mathrm{PREF}}_{i+1}-{\mathrm{PREF}}_i)/80}-1\}.........\left(8\right)$

Can learn by TPR from equation (8) based on the data transfer rate in the corresponding time period _RRIAnd the difference between the pilot reference level that occurs owing to the increase of data transfer rate is determined the transmitted power of RRI.In addition, in equation (8), TPR _RRIIt is the value that definition is used for determining the transmitted power of the RRI that frame sent that do not increase than past data rate at its data transfer rate.Frame in that its data transfer rate increases to some extent than past data rate utilizes TPR shown in equation (8) _RRIAnd the difference between the pilot reference level is determined the transmitted power of RRI.

When the such current data rate shown in (i+3) frame does not increase than past data rate, determine the transmitted power of RRI channel by following equation:

$P_{\mathrm{RRI}}=P_{\mathrm{pp}}\×{10}^{\left({\mathrm{TPR}}_{\mathrm{RRI}}\right)/10}.........\left(9\right)$

In equation (8) and equation (9), TPR _RATERatio between expression business and the pilot power, and TPR _RRIRatio between the transmitted power of the transmitted power of expression RRI channel and main pilot signal, and according to the data transfer rate of Traffic Channel can be different TPR is set _RRI

Because only use main pilot signal here, therefore determine the transmitted power of reverse traffic channel, and do not consider the increase of data transfer rate by equation (2).

The reason that increases the transmitted power of RRI and do not send less important pilot signal in the time period that its data transfer rate increases is to use RRI to carry out channel compensation rather than to use less important pilot signal.When the transmitted power of RRI increased, the base station at first used main pilot signal to come RRI is carried out channel compensation, the RRI of channel compensation is decoded and utilizes decoded result that the symbol (sign) of received RRI sequence is set to "+".The symbol setting of RRI sequence is equal to according to the decoded result of received RRI sequence comes from the RRI sequence, to extract channel compensation information, promptly extract the information relevant with fading channel by multiply by an estimated sequence.

Decoding performance according to RRI can be used embodiments of the invention.For example, if it is very low to determine the decoding error rate of RRI, use the RRI that transmitted power was sent to carry out channel compensation so to have increased.

Fig. 7 illustrates according to another embodiment of the present invention the flow chart of process of being determined the transmitted power of RRI channel by mobile radio station.With reference to figure 7, in step 710, mobile radio station is at the data transfer rate Rate of i frame with Traffic Channel _iSend business datum.In step 720, mobile radio station is at (i+1) frame specified data rate Rate _I+1In step 730, mobile radio station is the data transfer rate Rate of (i+1) frame relatively _I+1Data transfer rate Rate with the i frame _iIf the data transfer rate Rate of (i+1) frame _I+1Data transfer rate Rate greater than previous frame _i, mobile radio station determines to increase the transmitted power of RRI channel in step 740 so.

After this, mobile radio station is determined the RR I of (i+1) frame and the ratio of main pilot power in step 750, and determines that in step 760 each transmitted power of Traffic Channel and RRI channel is so that make the transmitted power and the transmitted power of main pilot channel have predetermined ratio.The ratio of RRI and main pilot power comprises the increment that increase caused by data transfer rate, and consequently, determines the transmitted power of RRI channel according to equation (8).

On the contrary, if determine the data transfer rate Rate of (i+1) frame _I+1Be not more than the data transfer rate Rate of previous frame _i, mobile radio station is determined the transmitted power that does not increase the RRI channel in step 770 so.After this, mobile radio station is determined the ratio of RRI and main pilot power in step 780, and determines that in step 790 each transmitted power of Traffic Channel and RRI channel is so that the transmitted power of this transmitted power and main pilot channel has predetermined ratio.Here, the ratio of RRI and main pilot power does not comprise because the increment that increase caused of data transfer rate, and consequently, determines the transmitted power of RRI channel according to equation (9).

Fig. 8 illustrates the flow chart of determining reverse power control target localization point by the base station according to another embodiment of the present invention and carrying out the process of channel compensation.With reference to figure 8, in step 810, the base station receive mobile radio station at the i frame with data transfer rate Rate _iThe business datum that is sent.In step 820, the base station is come carrying out channel compensation at the received RRI of (i+1) frame and after this RRI of channel compensation being decoded and detect at the employed data transfer rate of (i+1) frame by using main pilot signal.In step 830, the data transfer rate Rate by (i+1) frame that mobile radio station sent is compared in the base station _I+1Data transfer rate Rate with previous frame _i

If Rate _I+1Greater than Rate _i, the base station receives (i+1) frame data and after this increases the power controlled target anchor point of (i+2) frame in step 840 so.Increase power controlled target anchor point according to equation (6).In step 850, the base station utilizes main pilot signal and RRI and carries out channel compensation at (i+1) frame.The base station use main pilot signal and RRI both because the transmitted power of RRI has increased at the frame that its data transfer rate has increased.

When main pilot signal and RRI all were used for channel compensation, main pilot signal and RRI should be synthesized in the base station.Synthetic (MRC) synthesizes main pilot signal and RRI by maximum ratio, and in the synthetic process of MRC, is defined as with the transmission power value of main pilot signal and RRI the gain of multiplying each other with main pilot signal and RRI separately proportional.For example, if the transmitted power ratio of main pilot signal and RRI is a: b makes main pilot signal multiply by gain " a " so and makes RRI multiply by gain " b ".

Yet, if determine mobile radio station at the employed data transfer rate Rate of (i+1) frame in step 830 _I+1Equal the data transfer rate Rate of previous frame _i, the base station keeps the power controlled target anchor point of (i+2) frame to equate with the power controlled target anchor point of (i+1) frame in step 860 so.After this, in step 870, the base station is come the Traffic Channel of (i+1) frame is carried out channel compensation by only using main pilot signal.

At last, if determine mobile radio station at the employed data transfer rate Rate of (i+1) frame in step 830 _{i + 1}Data transfer rate Rate less than previous frame _i, the base station power controlled target anchor point that makes (i+2) frame in step 880 decreases than the power controlled target anchor point of (i+1) frame so.After this, in step 890, the base station is come the Traffic Channel of (i+1) frame is carried out channel compensation by only using main pilot signal.Utilize equation (7) to determine the power controlled target anchor point that reduces.

After the data transfer rate of respective frame was detected in the base station, the ratio of RRI and the power of main pilot signal can be determined in the base station.In this case, measured and be used for inner loop power when control as RRI, can not need additional single frames to postpone to control to be used for power with exempting from, cause mis-behave.Therefore, described as the first embodiment of the present invention, main pilot signal is only used in the base station in the process of carrying out inner loop power control.That is to say that main pilot signal, more measured main pilot signal and power controlled target anchor point are only measured in the base station and this post command mobile radio station increases or reduce transmitted power according to comparative result.

Fig. 6,7, and 8 in, when data transfer rate increases, utilize the method for the transmitted power of increase RRI to keep channel estimating performance.In the another embodiment of the present invention that can realize similar performance, determine the RRI transmitted power of the frame that increases at its data transfer rate according to following equation (10) rather than equation (8).

$P_{\mathrm{RRI}}=P_{\mathrm{pp}}\×\mathrm{MAX}\{{10}^{\mathrm{TP}{R}_{\mathrm{RRI}}/10},{10}^{({\mathrm{PREF}}_{i+1}-{\mathrm{PREF}}_i)/80}-1\}.........\left(10\right)$

In equation (10), (a, b) expression is used for selecting from " a " and " b " function of higher value to MAX.For example, if a＞b selects " a " so, and under opposite situation, promptly under the situation of a＜b, select " b ".The RRI transmitted power of the frame of its data transfer rate increase is set to following transmitted power as can be known from equation (10), and this transmitted power is based on TPR _RRITransmitted power with based on the greater in the additional transmitted power of pilot reference level difference value.

The foregoing description can be applied to and regulate the reverse data rate mobile radio station in one step.The operation of regulating one step of reverse data rate is called the rate controlled pattern, and this rate controlled pattern is different from progress pattern (scheduled mode), data transfer rate allows to be conditioned two step or multisteps in described progress pattern.In this rate controlled pattern, mobile radio station is in response to increasing or reduce by one step of data transfer rate from the instruction of base station according to the step-length (step) of the data transfer rate shown in the form 1.In the progress pattern, the base station allows mobile radio station to change data transfer rate two step or multisteps, and after this mobile radio station is determined its oneself reverse data rate in the allowed band.

In the progress pattern, after sending reverse data with High Data Rate moment (instantaneously), mobile radio station should be changed into lower data transfer rate fast with its data transfer rate.Yet, if mobile radio station is after sending reverse data with High Data Rate and increase power controlled target anchor point according to data transfer rate, mobile radio station must send reverse data with very high transmitted power so, even mobile radio station is changed into lower data transfer rate at next frame with its data transfer rate.Therefore, in yet another embodiment of the present invention, in the progress pattern, even reverse data rate has increased, the base station is also by utilizing less important pilot signal to come deficit power is compensated, and need not to increase power controlled target anchor point.

Fig. 9 is the schematic diagram of backward power control method performed in the mobile radio station therein of explanation another embodiment according to the present invention or the mobile communication system that reverse data rate is determined in the base station, and it is another method that is used to solve following problems, and this problem is promptly owing to the single frames of power controlled target anchor point postpones the received power of base station is become less than suitable level.

With reference to figure 9, do not allow the progress pattern at i frame to (i+2) frame.Mobile radio station uses the data transfer rate of 38.4kbps at the i frame, and according to the rate controlled pattern data transfer rate is increased to 76.8bkps (step 910) by single step at (i-M) frame.When data transfer rate increases by this way, consider that the base station will postpone to carry out power control with single frames, thereby mobile radio station compensates necessary secondary power and sends less important pilot signal (step 920) to carry out efficient channel.Less important pilot signal has and the corresponding power of following difference, and to be the base station receive difference between necessary total pilot power of (i+1) frame and the main pilot signal power with 76.8kbps to described difference.

If examining, the base station knows that mobile radio station at first receives (i+1) RRI and after this increases power controlled target anchor point (step 930) so at the data transfer rate of the employed data transfer rate of (i+1) frame greater than previous frame.In this case, both carry out channel compensation by utilizing main pilot signal and less important pilot signal in the base station.At (i+2) frame, do not send less important pilot signal, because equal the data transfer rate of previous frame at the data transfer rate of the employed 76.8kbps of (i+2) frame.

When the base station allows the progress pattern to be used for (i+3) frame, mobile radio station increases to for example 307.2kbps with data transfer rate by two steps at (i+3) frame, and with and the necessary total pilot power of 307.2kbps send less important pilot signal (step 940) with the main corresponding power of difference between the pilot power.

At (i+4) frame, because known road, base station mobile radio station formerly pattern uses the progress pattern, even therefore the base station is examined the data transfer rate of knowing (i+4) frame increase to some extent than the data transfer rate of (i+3) frame or previous frame, this base station does not increase power controlled target anchor point (step 950) yet.After the RRI that receives (i+4) frame, regulate power controlled target anchor point.

When the progress of use pattern, it is identical with operation described in conjunction with Figure 4 that mobile radio station sends the operation of main pilot signal and less important pilot signal.That is to say that when mobile radio station was determined to increase data transfer rate by a step or multistep, mobile radio station sent less important pilot signal so that the data transfer rate that is increased is compensated with essential power.Difference between the pilot reference level by determining the past data rate and the pilot reference level of current data rate is determined the transmitted power of less important pilot signal.

Figure 10 is the flow chart of the process that is used for definite reverse power control target localization point and execution channel compensation of explanation another embodiment according to the present invention.With reference to Figure 10, in step 1010, the base station receive mobile radio station at the i frame with data transfer rate Rate _iThe business datum that is sent.In step 1020, the base station is come carrying out channel compensation at the received RRI of (i+1) frame and after this RRI of channel compensation being decoded and detect at the employed data transfer rate Rate of (i+1) frame by utilizing main pilot signal _I+1In step 1030, base station comparing data rate Rate _I+1Data transfer rate Rate with previous frame _i

If Rate _I+1Greater than Rate _i, the base station is determined the progress pattern in step 1040 and whether is used for (i+1) frame so.Whether two steps of data transfer rate or the multistep that allow mobile radio station to regulate (i+1) frame according to the base station determine whether to use the progress pattern.This is because in order to use the progress pattern, the base station should allow mobile radio station to regulate data transfer rate two step or multisteps.

If determine permission progress pattern in step 1040, the base station advances to step 1060 so, the base station utilizes main pilot signal and less important pilot signal to come (i+1) frame is carried out channel compensation in this step 1060, and does not regulate power controlled target anchor point.

On the contrary, if determine the progress pattern that do not allow in step 1040, the base station advances to step 1050 so, the base station increases the power controlled target anchor point of (i+2) frame in step 1050, and after this advance to step 1060, the base station utilizes main pilot signal and less important pilot signal both comes (i+1) frame is carried out channel compensation in step 1060.Power controlled target anchor point increases according to equation (6).

Yet, if determine mobile radio station at the employed data transfer rate Rate of (i+1) frame in step 1030 _{i + 1}Equal the data transfer rate Rate of previous frame _i, the base station keeps the power controlled target anchor point of (i+2) frame to equal the power controlled target anchor point of (i+1) frame in step 1070 so.After this, in step 1080, the base station is come the Traffic Channel of (i+1) frame is carried out channel compensation by only utilizing main pilot signal.

At last, if determine the data transfer rate Rate of (i+1) frame in step 1030 _I+1Data transfer rate Rate less than previous frame _i, the power controlled target anchor point of (i+2) frame is determined in the base station according to the power controlled target anchor point of (i+1) frame in step 1090 so.After this, in step 1100, the base station is come the Traffic Channel of (i+1) frame is carried out channel compensation by only utilizing main pilot signal.The power controlled target anchor point that reduces utilizes equation (7) to reduce.

In the above-described embodiments, when changing the data transfer rate of mobile radio station, determine the ratio TPR of RRI and pilot power according to equation (3) or equation (4) _RRI, so that the received power of RRI channel is constant.When according to whether receiving RRI when regulating power controlled target anchor point, the receptivity of RRI is particularly important.Especially, when mobile radio station made the current data rate increase to some extent than past data rate, the base station must inerrably receive RRI so that the constant receptivity of suitable adjusting power controlled target anchor point and maintenance Traffic Channel.

When the current data rate that sends Traffic Channel is increased to some extent than past data rate, be used for reducing an illustrative methods of the reception error rate of RRI, determine TPR _RRIIncrease the received power of RRI channel when increasing to some extent than past data rate with convenient current data rate.For example, if use 38.4kbps and use 76.8kbps at (i+1) frame or next frame at the i frame, the equation (11) of mobile radio station below utilizing determined the transmitted power at the RRI channel of (i+1) frame so.

$P_{\mathrm{RRI}}=(P_{\mathrm{pp}}+P_{\mathrm{sp}})\×{10}^{({\mathrm{TPR}}_{\mathrm{RRI}}+\mathrm{\Δ})/10}.........\left(11\right)$

In equation (11), Δ have by system planner's institute's predetermined value in case this value more than or equal to 0.At the frame that its data transfer rate increases, want big Δ according to the determined RRI transmitted power of equation (3) according to the determined RRI transmitted power of equation (11) beguine.When transmitted power increases in this manner, also increase the received power of base station, cause the raising of the RRI receptivity in the time period that data transfer rate increases.

Even, determine the transmitted power of RRI channel by following equation in order when data transfer rate reduces, also to improve the RRI receptivity.

$P_{\mathrm{RRI}}=P_{\mathrm{pp}}\×{10}^{({\mathrm{TPR}}_{\mathrm{RRI}}+\mathrm{\Δ})/10}.........\left(12\right)$

Want big Δ according to the determined RRI transmitted power of equation (12) beguine according to the determined RRI transmitted power of equation (4), cause the raising of RRI receptivity.

With reference to Figure 11 and 12, in the mobile communication system of determining reverse data rate at mobile radio station it having been used the mobile radio station transmitter of new backward power control method and the structure of base station receiver is described.Though the structure of Figure 11 and 12 is designed to support the CDMA standard as example, also it can be designed to support other communication standard.

Figure 11 is the block diagram of explanation according to the internal structure of the mobile radio station transmitter that backward power control method was applied to of the embodiment of the invention.Mobile radio station transmitter design one-tenth is sent to the base station with reverse traffic channel data, RRI channel data and main pilot tone and/or less important pilot tone in conjunction with Fig. 3,6 and 9 described methods.

With reference to Figure 11, the mobile radio station transmitter comprises addressable part 1110, widening parts 1120, power controller 1130 and adder 1140.

Addressable part 1110 comprises operation code device 1111 and RRI encoder 1113.The reverse data that operation code device 1111 is received on the reverse traffic channel to be sent, and received reverse data carried out chnnel coding.RR1 encoder 1113 receives such as data transfer rate and at the such business control information of the transmission bits number of the reverse data that respective frame sent (or RRI channel information), and received RRI channel information is carried out chnnel coding.

Widening parts 1120 comprises Walsh (Walsh) expander of knowing a plurality of the sixth of the twelve Earthly Branches 1121,1123,1125 and 1127, is used to utilize corresponding walsh code to come received reverse data, less important and/or main pilot signal position and business control information (RRI position) are carried out quadrature spread.Before reverse data and RRI channel signal are carried out quadrature spread, come respectively this reverse data and RRI channel signal are carried out chnnel coding by operation code device 1111 and RRI encoder 1113.

The output of widening parts 1120 is input to is used for power controller 1130 that reverse data, gain less important and/or pilot signal and RRI channel signal are controlled.This power controller 1130 is according to the transmission power gain of controlling each input signal in conjunction with one of Fig. 3,6 and 9 described methods.

Power controller 1130 comprises professional gain controller 1131, less important and/or main pilot tone gain controller 1133 and 1135 and RRI gain controller 1137, and this power controller 1130 offers adder 1140 with gain controlled output signal.Adder 1140 is added together with reverse data, less important and/or main pilot signal and the RRI channel signal of power controller 1130 its gains of control, and after this sends it to the base station by radio frequency (RF) module and the radio net of not describing.

With reference now to Fig. 3,6, and 9 backward power control method come the operation of above-mentioned mobile radio station transmitter is described separately.

Carry out reverse power control by less important pilot signal

In the backward power control method of Fig. 3, if the data transfer rate of the present frame of reverse data is greater than the data transfer rate of previous frame, the mobile radio station less important pilot signal and the main pilot signal that will have a following transmitted power sends to the base station so, described transmitted power with and the pilot reference level that is complementary of the data transfer rate of present frame and and the pilot reference level that is complementary of the data transfer rate of previous frame between difference corresponding, and the base station utilizes the power sum of received main pilot signal and less important pilot signal to come the Traffic Channel of respective frame is carried out channel compensation.

Under the situation of the method for Fig. 3,1123 pairs of less important pilot signals of Walsh expander position is expanded, and pilot reference level and the difference pilot reference level of previous frame between the transmitted power of regulating less important pilot signal of less important pilot tone gain controller 1133 by present frame.

Simultaneously, the reverse data of operation code device 1111 and 1121 pairs of present frames of Walsh expander is encoded and it is expanded, and professional gain controller 1131 is regulated the transmission power gain of reverse data so that total transmitted power of the transmitted power of reverse data and main pilot signal and less important pilot signal has predetermined ratio.In addition, come the RRI channel signal of present frame is encoded and it is expanded by RRI encoder 1113 and Walsh expander 1127, and RRI gain controller 1137 is regulated the transmission power gain of RRI channel signals so that total transmitted power of the transmitted power of RRI channel signal and main pilot signal and less important pilot signal has predetermined ratio.

Yet, if the data transfer rate of the present frame of reverse data is less than or equal to the data transfer rate of previous frame, the mobile radio station main pilot signal that will have with the corresponding transmitted power of pilot reference level of current data rate sends to the base station rather than sends less important pilot signal so, and the base station utilizes the power of received main pilot signal to come the Traffic Channel of respective frame is carried out channel compensation.In this case, come the reverse data of present frame is encoded and it is expanded by operation code device 1111 and Walsh expander 1121, and professional gain controller 1131 is regulated the transmission power gain of reverse datas so that the transmitted power of the transmitted power of reverse data and main pilot signal has predetermined ratio.

In addition, come the RRI channel signal of present frame is encoded and it is expanded by RRI encoder 1113 and Walsh expander 1127, and RRI gain controller 1137 is regulated the transmission power gain of RRI channel signals so that the transmitted power of the transmitted power of RRI channel signal and main pilot signal has predetermined ratio.In addition, if the data transfer rate of the present frame of reverse data is less than or equal to the data transfer rate of previous frame as mentioned above, end the operation of the gain controlling that less important pilot signal of expansion and less important pilot tone gain controller 1133 carry out so.

Carry out reverse power control by the RRI channel signal

In the backward power control method of Fig. 6, if the data transfer rate of the present frame of reverse data is greater than the data transfer rate of previous frame, the mobile radio station RRI channel signal and the main pilot signal that will have a following additional transmitted power sends to the base station so, difference between the pilot reference level of the pilot reference level of described additional transmitted power and the data transfer rate of present frame and the data transfer rate of previous frame is corresponding, and this base station utilizes the gross power of received main signal and RRI channel signal to come the Traffic Channel of respective frame is carried out channel compensation.

Under the situation of the method for Fig. 6, encode and it is expanded by the RRI channel signal of RRI encoder 1113 and 1127 pairs of present frames of Walsh expander, and RRI gain controller 1137 increases and the corresponding transmitted power of following difference extraly, and described difference is the difference between the pilot reference level of data transfer rate of the pilot reference level of data transfer rate of present frame and previous frame.At this moment, encode and it is expanded by the reverse data of operation code device 1111 and 1121 pairs of present frames of Walsh expander, and professional gain controller 1131 is regulated the transmission power gain of reverse datas so that the transmitted power of the transmitted power of reverse data and main pilot signal has predetermined ratio.

If the data transfer rate of the present frame of reverse data is less than or equal to the data transfer rate of previous frame, mobile radio station will have that main pilot signal with the corresponding transmitted power of pilot reference level of current data rate sends to the base station and the transmitted power that do not increase the RRI channel so, and the base station utilizes the power of received main pilot signal to come Traffic Channel is carried out channel compensation.In this case, the reverse data of operation code device 1111 and 1121 pairs of present frames of Walsh expander is encoded and it is expanded, and professional gain controller 1131 is regulated the transmission power gain of reverse data so that the transmitted power of the transmitted power of reverse data and main pilot signal has predetermined ratio.

In addition, the business control information of RRI encoder 1113 and 1127 pairs of present frames of Walsh expander is encoded and it is expanded, and RRI gain controller 1137 is regulated the transmission power gain of RRI channel signal so that the transmitted power of the transmitted power of RRI channel signal and main pilot signal has predetermined ratio.In addition, if the data transfer rate of the present frame of reverse data is less than or equal to the data transfer rate of previous frame as mentioned above, end the gain controlling operation of 1137 pairs of RRI channel signals of RRI gain controller so.

Because above-mentioned mobile radio station transmitter does not need less important pilot signal to carry out reverse power control, therefore can omit Walsh expander 1123 and less important pilot tone gain controller 1133.

Carry out reverse power control by the progress pattern

In the backward power control method of Fig. 9, if having increased suddenly and received from the permission mobile radio station of base station, the reverse traffic amount of mobile radio station for example make data transfer rate increase the instruction of two steps or multistep according to the progress pattern, mobile radio station is carried out the power control in the backward power control method of Fig. 3 so, and wherein mobile radio station increases the same high and transmitted power that utilization has increased with the data transfer rate that is increased of the transmitted power of less important pilot signal and sends reverse data.Thus, the power controller 1130 of Figure 11 is regulated the transmitted power of less important pilot signal through professional gain controller 1131 and less important pilot tone gain controller 1133 by receiving from the base station the permission of progress pattern.

Undertaken in the control of backward power by the progress pattern according to of the present invention, data transfer rate takes place between successive frame increases by two step or multisteps, and less important pilot signal transmitted power increases highly equally with the increase of data transfer rate.This is to carry out in the backward power control method of Fig. 9, and because the backward power control method of the operation of the backward power control method of Fig. 9 and Fig. 3 is similar, therefore omits detailed description thereof.

Figure 12 is the block diagram of explanation according to the structure of the base station receiver that backward power control method was applied to of the embodiment of the invention.Base station receiver is received in reverse traffic channel, RRI channel data and main pilot tone and/or the less important pilot signal that is sent in Fig. 3,6 and 9 the method, and regulates power controlled target anchor point to carry out exterior ring power control.

For the suitable reverse traffic channel signal that is sent in Fig. 3,6 and 9 the method that is received in, before the processing that receives reverse traffic channel signal, what the base station must be preferential carries out reception and decode operation to including such as the RRI channel signal of the such business control information of the transmission bits number of data transfer rate and reverse data.Thus, Walsh despreader 1201 utilize walsh code and with known method to carrying out despreading by the received RRI channel signal of wireless network, and first channel estimator 1203 utilizes main pilot signal to come the RRI channel signal of institute's despreading is carried out channel compensation and its output is offered RRI decoder 1205.

The business control information that 1205 pairs of RRI channels of RRI decoder are transmitted is decoded and the business control information of being decoded is offered power control anchor point controller 1207 and Traffic Channel estimation controller 1211.The business control information that power control anchor point controller 1207 utilizes RRI to send determines whether increase, reduce or keep power controlled target anchor point in Fig. 3,6 and 9 method, and determined power controlled target anchor point information is offered power control bits (PCB) generator 1209.

Traffic Channel estimates that the business control information that controller 1211 utilizes RRI decoder 1205 to be provided determines whether reverse traffic channel is carried out channel compensation.Need channel compensation if determine, that is to say, if the data transfer rate of present frame is greater than the data transfer rate of previous frame, Traffic Channel estimates that controller 1211 control second channel estimators 1213 are so that 1213 pairs of reverse traffic channels of second channel estimator are carried out channel compensation so.In Fig. 3,6 and 9 method, utilize the ratio of existing less important pilot tone and less important pilot tone and main pilot power or RRI channel signal to realize estimating that by Traffic Channel 1211 pairs of Traffic Channels of controller carry out channel compensation.

Can learn that from top description the pilot signal that will have the transmitted power that is suitable for receiving the data that sent by mobile radio station on reverse traffic channel is used to improve the reverse traffic receptivity of base station.In addition, when mobile radio station changes data transfer rate, suitably regulate the transmitted power of main pilot signal and/or less important pilot signal and reverse traffic channel is carried out power control and it is carried out the transmitted power optimization of necessary main pilot signal of channel estimating and less important pilot signal so that make.Though provided the present invention and it be described with reference to certain preferred embodiment, under situation about not breaking away from, can make various modifications to those skilled in the art to its form and details by defined the spirit and scope of the present invention of claim subsequently.

Claims (23)

1, a kind of method of in communication system, controlling the transmitted power of backward channel by mobile radio station, the method comprising the steps of:

Mobile radio station is determined the data transfer rate of reverse traffic channel for each frame;

Mobile radio station compares first data transfer rate of present frame and second data transfer rate of previous frame; And

If first data transfer rate is greater than second data transfer rate, mobile radio station will have with the signal of the main pilot channel of the corresponding transmitted power of pilot reference level of second data transfer rate and the signal of less important pilot channel and send to the base station to be used to carry out the reverse traffic channel compensation so

Wherein less important pilot channel have and first data transfer rate and second data transfer rate between the corresponding transmitted power of difference of pilot reference level.

2, the method for claim 1, wherein said pilot reference level is mapped to described first and second data transfer rates.

3, the method for claim 1, wherein determine the transmitted power of less important pilot channel by following equation:

$P_{\mathrm{sp}}=P_{\mathrm{pp}}\×\{{10}^{({\mathrm{PREF}}_{i+1}-{\mathrm{PREF}}_i)/80}-1\}$

P wherein _SpThe transmitted power of representing less important pilot channel, P _PpThe transmitted power of representing main pilot channel, and PREF _iAnd PREF _I+1The pilot reference level of representing the data transfer rate of previous frame and present frame respectively.

4, the method for claim 1 further comprises step: if first data transfer rate is less than or equal to second data transfer rate, be sent in the signal of the central described main pilot channel of pilot channel.

5, a kind of in mobile communication system by the method for the transmitted power of base stations control backward channel, the method comprising the steps of:

Be received in the oppositely main pilot channel that sends each image duration and according to the increase of the reverse data rate of mobile radio station and the less important pilot channel that selectivity sends; And

If from mobile radio station receive main pilot channel and less important pilot channel both, utilize the received power of main pilot channel and less important pilot channel to come the signal on the reverse traffic channel is carried out channel compensation so,

Wherein less important pilot channel have and first data transfer rate and second data transfer rate between the corresponding transmitted power of difference of pilot reference level.

6, method as claimed in claim 5, further comprise step: if first data transfer rate less than second data transfer rate, reduces the power controlled target anchor point of next frame so according to the difference between the pilot reference level of the pilot reference level of first data transfer rate and second data transfer rate.

7, method as claimed in claim 6, wherein regulate power controlled target anchor point according to following equation:

${\mathrm{Setpoint}}_{i+2}={\mathrm{Setpoint}}_{i+1}\×{10}^{({\mathrm{PREF}}_{i+1}-{\mathrm{PREF}}_i)/80}$

Setpoint wherein _I+2And Setpoint _I+1Expression is used for carrying out the power controlled target anchor point that power is controlled at next frame and present frame respectively, and PREF _I+1And PREF _iThe corresponding pilot reference level of the data transfer rate of expression and present frame and previous frame respectively.

8, method as claimed in claim 6 further comprises step: if first data transfer rate equals second data transfer rate, be kept for the power controlled target anchor point of next frame so.

9, method as claimed in claim 8 further comprises step:

Measurement is in the pilot energy and the noise ratio of the reception of the signal of the received main pilot channel of next frame, and the pilot energy of more measured reception and noise ratio and power controlled target anchor point; And

Increase or reduce the transmitted power of main pilot channel according to comparative result order mobile radio station.

10, a kind of method of in mobile communication system, controlling the transmitted power of backward channel by mobile radio station, the method comprising the steps of:

Mobile radio station selects one of progress pattern and rate controlled pattern to determine the data transfer rate of reverse traffic channel;

Mobile radio station utilizes selected pattern and the data transfer rate of present frame is defined as first data transfer rate; And

If the progress pattern of utilization is determined first data transfer rate, mobile radio station will have with the signal of the main pilot channel of the corresponding transmitted power of pilot reference level of second data transfer rate of previous frame and the signal of less important pilot channel and send to the base station to be used to carry out the reverse traffic channel compensation so

Wherein less important pilot channel have and the pilot reference level of the pilot reference level of first data transfer rate and second data transfer rate between the corresponding transmitted power of difference.

11, method as claimed in claim 10, wherein when selection progress pattern, data transfer rate increases or reduces by two steps or multistep more.

12, method as claimed in claim 10, further comprise step: if the progress pattern of utilization is determined first data transfer rate, so relatively first data transfer rate and second data transfer rate, and if first data transfer rate greater than second data transfer rate, send the signal of described less important pilot channel so.

13, a kind of in mobile communication system by the method for the transmitted power of base stations control backward channel, the method comprising the steps of:

Be received in the oppositely main pilot channel that sends each image duration and according to the increase of the reverse data rate of mobile radio station and the less important pilot channel that selectivity sends; And

If the progress pattern of utilization is determined first data transfer rate, keep the power controlled target anchor point of next frame so and utilize the total received power of main pilot channel and less important pilot channel to come the signal on the reverse traffic channel is carried out channel compensation,

Wherein, described first data transfer rate is by the definite data transfer rate as present frame of mobile radio station;

Wherein, described less important pilot channel have and first data transfer rate and second data transfer rate between the corresponding transmitted power of difference of pilot reference level.

14, method as claimed in claim 13, wherein when selection progress pattern, data transfer rate increases or reduces two steps or multistep more.

15, method as claimed in claim 13 further comprises step:

Determine first data transfer rate if not the progress pattern of utilization, so relatively second data transfer rate of first data transfer rate and previous frame; And

If first data transfer rate is greater than second data transfer rate, increase the power controlled target anchor point of next frame according to the difference between the pilot reference level of the pilot reference level of first data transfer rate and second data transfer rate so, and utilize the total received power of main pilot channel and less important pilot channel to come the signal on the reverse traffic channel is carried out channel compensation.

16, method as claimed in claim 15, further comprise step: if first data transfer rate less than second data transfer rate, reduces the power controlled target anchor point of next frame so according to the difference between the pilot reference level of the pilot reference level of first data transfer rate and second data transfer rate.

17, method as claimed in claim 16, wherein regulate power controlled target anchor point according to following equation:

${\mathrm{Setpoint}}_{i+2}={\mathrm{Setpoint}}_{i+1}\×{10}^{({\mathrm{PREF}}_{i+1}-{\mathrm{PREF}}_i)/80}$

Setpoint wherein _I+2And Setpoint _I+1Expression is used for carrying out the power controlled target anchor point that power is controlled at next frame and present frame respectively, and PREF _I+1And PREF _iThe corresponding pilot reference level of the data transfer rate of expression and present frame and previous frame respectively.

18, method as claimed in claim 17 further comprises step: if first data transfer rate equals second data transfer rate, be kept for the power controlled target anchor point of next frame so.

19, method as claimed in claim 18 further comprises step:

Measurement is in the pilot energy and the noise ratio of the reception of the signal of the received main pilot channel of next frame, and the pilot energy of more measured reception and noise ratio and power controlled target anchor point; And

Increase or reduce the transmitted power of main pilot channel according to comparative result order mobile radio station.

20, method as claimed in claim 18, further comprise step: if first data transfer rate is less than or equal to second data transfer rate, determine so and only receive main pilot channel, and utilize the received power of main pilot channel to come the signal on the reverse traffic channel is carried out channel compensation.

21, method as claimed in claim 13 further comprises step: before first data transfer rate that calculates present frame, utilize the received power of main pilot channel to come the signal on the RRI channel is carried out channel compensation.

22, a kind of mobile radio station transmitting apparatus of in mobile communication system, controlling the transmitted power of backward channel, this equipment comprises:

First power controller is used to utilize main pilot power level value to regulate the transmission power gain of main pilot channel; And

Second power controller is used for regulating according to the increase of reverse data rate the transmission power gain of the less important pilot channel that selectivity sends,

Wherein less important pilot channel have and the pilot reference level of the data transfer rate of the pilot reference level of the data transfer rate of previous frame and present frame between the corresponding transmitted power of difference.

23, mobile radio station transmitting apparatus as claimed in claim 22 if wherein the data transfer rate of present frame is greater than the data transfer rate of previous frame, sends less important pilot channel so.

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