CN1138364C - Forward service rate regulating method and mobile station in CDMA system - Google Patents

Abstract

The present invention discloses a method for regulating the velocity of forward business in CDMA systems, and a mobile station capable of realizing the method. The method reduces forward transmitting power by regulating the velocity of business data, fully utilizes the discontinuity of data business and the variable characteristic of the velocity, and enhances the signal quality of the receiving end of the mobile station. Simultaneously the mobile station of the present invention comprises a transmitting and receiving system, a front-end signal processing unit, a timer, a control unit, a first multi-value comparator, a register queue, a state register and a second multi-value comparator. Therefore, the present invention can reduce forward transmitting power, decrease forward interference, and enhance forward system capacity.

Description

Adjust the method and the travelling carriage of forward service rate in a kind of cdma system

The present invention relates to adjust in a kind of cdma system the method and the travelling carriage of forward service rate.

In the business that cdma system provides, comprise speech business and data service, correspondingly, the capacity of cdma system comprises speech business capacity and data service capacity.In the system of IS-95 regulation, the main finger speech likeness of the deceased of power system capacity amount, and the technology of raising capacity mainly is power control, comprises forward link power control and power of reverse link control.But in third generation cdma system, main business no longer is speech business, but data service.That data service has is sudden, the characteristics of asymmetry and discontinuity, and data service especially on the forward link more becomes the main body of forward-link capacity.Data service has improved forward link load greatly, and only depends on the power control at speech business to be difficult to obtain satisfied effect.The main method of existing raising forward-link capacity is forward power control.From the quality of the forward link signal of base station or the quality of Frame, adjust transmitting power or submit the measurement of correlation report to, determines to adjust forward emitting power by the base station by the request base station by measurement for travelling carriage.Far away when travelling carriage apart from the base station, disturb when big, travelling carriage requires the bigger forward power of base station assigns satisfying the destination service quality, thereby has caused the bigger interference of forward direction.Especially travelling carriage is in soft switching process, and channel quality is relatively poor, and the forward direction serious interference greatly reduces the system forward capacity.

Problem at above-mentioned prior art existence, the purpose of this invention is to provide method and the travelling carriage of adjusting forward service rate in a kind of cdma system, by adjusting the forward emitted speed of data service, thereby can make system effectively reduce forward emitting power under the prerequisite of service quality and reduce forward direction and disturb satisfying, improve forward-link capacity.

For achieving the above object, the technical solution used in the present invention is: the method for adjusting forward service rate in a kind of cdma system, this method comprises travelling carriage speed adjustment process and base station speed adjustment process, wherein, travelling carriage speed adjustment process comprises the steps: (1) initialization, status register R is changed to the speed grade of business initial requirement; Register queue all is changed to the content identical with status register; (2) determine each speed threshold level TH_value1 (i), i=1 wherein ..., N-1, and TH_value (1)＞TH_value (2)＞...＞TH_value (N-1), wherein the speed grade sum of N for selecting; (3) measurement is from the pilot signal strength average PS of home base station; (4) the pilot signal strength average PS from home base station that obtains according to above-mentioned steps (3) selects in each speed threshold level that above-mentioned steps (2) determines the high threshold littler than PS, and remembers that this thresholding sequence number is k; If PS＜TH_value (N-1) remembers that then the thresholding sequence number is K=N; (5) register queue is carried out shifting function backward, incite somebody to action record deletion the earliest simultaneously, the threshold level k that obtains is pressed in the first register of register queue; (6) average speed grade CA in the statistic registers formation, and it is rounded processing; (7) current speed grade of preserving in CA and the status register is compared,,, continue execution in step (9) then as any adjustment if CA equals the content in the status register, if CA is not equal to the content in the status register, execution in step (8) then; (8) travelling carriage will send that to adjust speed grade be the request of CA to the base station, simultaneously under the control of control unit, status register contents will be changed to CA after rounding; (9) control unit is operated Synchronization Control under timer control, and returns step (3) beginning next round and handle after the measurement period T of interval travelling carriage to forward pilot;

Base station speed adjustment process comprises the steps: that (1) and travelling carriage keep the base station reception of the communicate by letter message from travelling carriage; (2) judge the rate adjustment request whether message that above-mentioned steps (1) receives has travelling carriage to report,, the channel management unit is sent in this request, continue execution in step (3), otherwise carry out above-mentioned steps (1) if having; (3) the channel management unit is judged the rate adjustment request of the travelling carriage that receives, if this data service supporting rate change, and would support the speed grade that requires, execution in step (4), otherwise execution in step (6); (4) whether the current system loading of channel management unit judges allows to carry out rate-allocation, if system loading allows execution in step (5), otherwise execution in step (6); (5) distribute the speed grade that requires to give corresponding Channel Elements, finish this subrate adjustment operation then, return step (1) and continue operation; (6) keep the current speed grade in respective channels unit, keep the current data rate in respective channels unit, return step (1) and continue operation.

The high threshold littler than PS can be carried out according to following method in each speed threshold level of above-mentioned selection: with PS and several thresholdings TH_value (i) (i=1 ..., N-1) compare, thereby select wherein the high threshold littler than PS.

The high threshold littler than PS also can be carried out according to following method in each speed threshold level of above-mentioned selection: calculate the poor DPS that concentrates the pilot frequency intensity PS1 of maximum in the pilot frequency intensity from the pilot signal strength average PS of home base station and travelling carriage stored candidate, with DPS and several thresholdings TH_value (i) (i=1, ..., N-1) compare, thereby select wherein little high threshold than PS.

The high threshold littler than PS can also be carried out according to following method in each speed threshold level of above-mentioned selection: the poor DPS that calculates the pilot frequency intensity PS1 of intensity maximum in the pilot tone Active Set of storing from the pilot signal strength average PS of home base station and travelling carriage, with DPS and some thresholding TH_value (i) (i=1 that makes, ..., N-1) compare; Thereby select wherein little high threshold than PS.

In order to realize adjusting in the above-mentioned cdma system method of forward service rate, the present invention provides the travelling carriage that can realize said method simultaneously, described travelling carriage comprises emitting-receiving system, the front end signal processing unit, timer, control unit, and the first many-valued comparator, register queue, the status register and the second many-valued comparator, above-mentioned front end signal processing unit and emitting-receiving system, the first many-valued comparator interconnects, control unit and front end signal processing unit, the first many-valued comparator, register queue, status register, the second many-valued comparator and timer interconnect, the register queue and the first many-valued comparator and the second many-valued comparator interconnect, and the status register and the second many-valued comparator interconnect; Wherein, emitting-receiving system is used for the reception and the transmission of radiofrequency signal; The front end signal processing unit is used for the measurement of forward pilot intensity, the pilot signal strength PS of output home cell; PS and each thresholding that the first many-valued comparator is used for measuring compare, the threshold level k after the output relatively; Register queue is used to write down former thresholding comparative result repeatedly, and the threshold level of statistical average, and it is rounded processing; Status register is used to write down current speed grade; Statistical average threshold level and current speed grade that the second many-valued comparator is used for register queue is obtained compare, if statistical average threshold level and current speed grade are equal, then export 0, otherwise the speed grade of output statistical average; Timer is used for control unit is carried out timing; Control unit is used for the synchronous of each unit and control front end signal processing unit carries out period measurement, receives the output valve of the second many-valued comparator simultaneously, if be output as 0, does not then do any change; If export non-vanishingly, then that rate adjustment request and other business tines are multiplexing or be inserted on the corresponding backward channel, revise status register simultaneously and be the speed grade after the rounding of statistical average.

Because the present invention has adopted the method that traffic data rate reduces forward emitting power of adjusting of utilizing, the discontinuity of data service and the characteristic of rate-compatible have been made full use of, when disturbing greatly, travelling carriage request base station reduces the transmission rate of digital service, to improve the signal quality of travelling carriage receiving terminal, therefore the system that makes has been issued to the reduction forward emitting power in the adjustment of fast power control, reduces forward direction and disturbs, and improves the purpose of forward direction power system capacity.

The present invention is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the cdma system structure chart;

Fig. 2 is the internal structure logic diagram of base station;

Fig. 3 is a travelling carriage logical construction schematic diagram of the present invention;

Fig. 4 is the travelling carriage speed adjustment process flow chart of the inventive method;

Fig. 5 is the base station speed adjustment process flow chart of the inventive method.

At first the principle of institute of the present invention foundation is set forth.In a cdma system, comprise travelling carriage, the base station under this travelling carriage and several adjacent cell base stations, and by travelling carriage to the reverse link of base station with by the forward link of base station to travelling carriage.Wherein, the base station comprises an emitting-receiving system, several Channel Elementss and a channel management unit.Emitting-receiving system is responsible for transmitting and receiving of radiofrequency signal; Channel Elements is responsible for the baseband coding and the spread spectrum of concrete channel; And the channel management unit is responsible for Channel Elements is carried out resource allocation, comprises channel gain and data service rate.Travelling carriage also comprises an emitting-receiving system, if the signal strength signal intensity that travelling carriage receives is represented with the ratio Eb/Io of energy per bit with disturbance spectrum density, the minimum Eb/Io of mobile you quality of service requirement represents with γ, signal bandwidth is W, data rate is R, the ratio that the signal power that mobile station receiver receives accounts for this sub-district maximum power is μ (i), and the white noise spectrum density of mobile station receiver end is N _oThe ratio that this district common channel power accounts for gross power is k, and this sub-district maximum power that mobile station receiver receives is S, and other professional forward direction interference factors that produce of this sub-district are α, the forward direction interference factor that cause other base stations, adjacent sub-district is β, and there is N business this sub-district.Then have at the travelling carriage receiving terminal: $\frac{E_b}{I_O}=\frac{W}{R}\frac{\mathrm{\μ}\left(i\right)\·S}{\mathrm{\α}\·[K+\underset{j\≠i}{\overset{N}{\mathrm{\Σ}}}\mathrm{\μ}\left(j\right)]\·S+\mathrm{\β}\·S}=\frac{W}{R}\frac{\mathrm{\μ}\left(i\right)}{\mathrm{\α}\·[k+\underset{j\≠i}{\overset{N}{\mathrm{\Σ}}}\mathrm{\μ}\left(j\right)]+\mathrm{\β}}\≥\mathrm{\γ}$ By following formula as can be known, the index Eb/Io that embodies quality of service (as the error rate and frame error rate) can control by adjusting forward emitting power ratio μ (i) or service rate R.Simultaneously, for identical Eb/Io, adopt less data rate can obtain littler forward emitting power.Therefore, for speech business, because service rate is non-adjustable, the forward power ratio of the distribution that only changes reaches the Eb/Io of quality requirement.For data service, can be by adjusting power proportions simultaneously and service rate achieves the goal.Consider satisfying and reduce forward emitting power under the prerequisite of service quality as far as possible, the present invention proposes on the basis of forward direction fast power control, according to moving table measuring to around the variation disturbed and the estimation situation that takies forward power, far away when travelling carriage apart from home base station, disturb when increasing, reduce request by the travelling carriage decision to the base station transmission rate, the base station is after receiving this request, judge that this business whether can the reduction of speed rate, if of course, then the data service rate of travelling carriage is reduced one or several grade emission; When travelling carriage is nearer apart from the base station, during interference reduction, when if travelling carriage finds that forward business is not launched with original rate, then determine to base station transmission rate recovery request by travelling carriage, the base station is after receiving this request, judge whether this service rate can recover, if of course, then by the service rate that waits the level restoration travelling carriage, with the rate transmissioning data business after recovering.

Below enforcement of the present invention is described further.

Fig. 1 is that operation cdma system of the present invention is the cellular cell system, with reference to figure 1.Comprise 100, one base stations 110 of a travelling carriage among the figure, the forward link of travelling carriage and the reverse link that travelling carriage arrives the base station are arrived in the base station.

Fig. 2 is the internal structure logic diagram of the base station of operation the inventive method, and with reference to figure 2, dotted line is a control flows among the figure; Solid line is an information flow.Base station 110 comprises an emitting-receiving system 111 among the figure, is responsible for the reception and the transmission of radiofrequency signal; The base station also comprises two Channel Elementss 112 and 113, and Channel Elements 112 is responsible for the baseband coding and the spread processing of forward traffic channels, Channel Elements 113 be responsible for reverse control channels separate spread spectrum and baseband decoding is handled; The base station also comprises a channel management unit 114, is responsible for distributing and managing various system resources to Channel Elements, comprises service rate and channel gain; The base station also comprises a control unit 115, is responsible for each units synchronization and coordination.When communicating, the base station is sent business datum into Channel Elements 112 and is carried out baseband coding and spread processing under 114 controls of channel management unit, and the multiplexing base station receiving system 111 that is sent to of spread-spectrum signal is carried out radio-frequency transmissions; And the radiofrequency signal that the base station receives is sent into base station receiving system 111 and is carried out radio frequency processing, again the spread-spectrum signal of output is sent into Channel Elements 113 and separate spread spectrum and baseband decoding, control unit 115 is sent to channel management unit 114 with the user resources solicited message of Channel Elements 113 outputs then.Channel management unit 114 determines according to the user resources solicited message that receives whether Resources allocation is given the corresponding customer service of using, the transmission rate and the corresponding channel gain that comprise data service, if can distribute, then 114 controls corresponding Channel Elements in channel management unit is realized resource distribution.

Fig. 3 is a travelling carriage logical construction schematic diagram of the present invention, and with reference to figure 3, thick line is an information flow among the figure; Fine rule is a control flows.Travelling carriage of the present invention comprises emitting-receiving system 101, front end signal processing unit 102, timer 107, control unit 108, also comprise the first many-valued comparator 103, register queue 104, the status register 105 and the second many-valued comparator 106, make above-mentioned front end signal processing unit 102 and emitting-receiving system 101, the first many-valued comparator 103 interconnects, make control unit 108 and front end signal processing unit 102, the first many-valued comparator 103, register queue 104, status register 105, the second many-valued comparator 106 and timer 107 interconnect, the register queue 104 and the first many-valued comparator 103 and the second many-valued comparator 106 are interconnected, and the status register 105 and the second many-valued comparator 106 interconnect; Wherein, emitting-receiving system 101 is used for the reception and the transmission of radiofrequency signal; Front end signal processing unit 102 is used for the measurement of forward pilot intensity, the pilot signal strength PS of output home cell; The first many-valued comparator 103, PS and each thresholding of being used for measuring compare, the threshold level k after the output relatively; Register queue 104 is used to write down former thresholding comparative result repeatedly, and the threshold level of statistical average, and it is rounded processing; Status register 105 is used to write down current speed grade; The second many-valued comparator 106, the statistical average threshold level and the current speed grade that are used for register queue 104 is obtained compare, if statistical average threshold level and current speed grade equate, then export 0, otherwise output statistical average to round after speed grade; Timer 107 is used for control unit is carried out timing; Control unit 108 is used for the synchronous of each unit and control front end signal processing unit 102 carries out period measurement, receives the output valve of the second many-valued comparator 106 simultaneously, if be output as 0, does not then do any change; If export non-vanishing, then that rate adjustment request and other business tines are multiplexing or be inserted on the corresponding backward channel, revise simultaneously status register 105 for statistical average obtain round after speed grade.

For the method for adjusting forward service rate in the cdma system of the present invention, this method comprises travelling carriage speed adjustment process and base station speed adjustment process, wherein, travelling carriage speed adjustment process is moved in travelling carriage, with reference to figure 4, be specially: in step 1, carry out system initialization, status register R is changed to the speed grade of business initial requirement; Register queue all is changed to the content identical with status register; In step 2, determine each speed threshold level TH_value1 (i), i=1 wherein ..., N-1, and TH_value (1)＞TH_value (2)＞...＞TH_value (N-1), wherein the speed grade sum of N for selecting; In step 3, measure pilot signal strength average PS from home base station; In step 4, the pilot signal strength average PS from home base station that obtains according to above-mentioned steps 3 selects in each speed threshold level that above-mentioned steps 2 determines the high threshold littler than PS, and remembers that this thresholding sequence number is k; If PS＜TH_value (N-1) remembers that then the thresholding sequence number is K=N; In step 5 register queue is carried out shifting function backward, incite somebody to action record deletion the earliest simultaneously, the threshold level k that obtains is pressed in the first register of register queue; In step 6, average speed grade CA in the statistic registers formation, and it is rounded processing; In step 7, the current speed grade of preserving in CA and the status register is compared, if CA equals the content in the status register, then, continue execution in step 9 not as any adjustment, if CA is not equal to the content in the status register, then execution in step 8; To send the adjustment speed grade to the base station at step 8 travelling carriage is the request of CA, under the control of control unit, status register contents is changed to through the CA after rounding simultaneously; In step 9, control unit is operated Synchronization Control under timer control, and returning step 3 beginning next round behind T at regular intervals handles, this described time T is the measuring period of travelling carriage to forward pilot, supposing the system is CDMA2000, then this value can be chosen as 1.25*M (ms) (frame length of 20ms among the corresponding CDMA2000 1X, wherein M is a positive integer).

Base station speed adjustment process is moved in the base station, with reference to figure 5, is specially: in step 1, the base station of communicating by letter with the travelling carriage maintenance receives the message from travelling carriage; In step 2, judge the rate adjustment request whether message that above-mentioned steps 1 receives has travelling carriage to report, if having, the channel management unit is sent in this request, continue execution in step 3, otherwise carry out above-mentioned steps 1; In step 3, the channel management unit is judged the rate adjustment request of the travelling carriage that receives, if this data service supporting rate change, and would support the speed grade that requires, execution in step 4, otherwise execution in step 6; In step 4, whether the current system loading of channel management unit judges allows to carry out rate-allocation, if system loading allows execution in step 5, otherwise execution in step 6; In step 5, distribute the speed grade that requires to give corresponding Channel Elements, finish this subrate adjustment operation then, return step 1 and continue operation; In step 6, keep the current speed grade in respective channels unit, keep the current data rate in respective channels unit, return step 1 and continue operation.

In travelling carriage speed adjustment process, high threshold littler than PS in each speed threshold level of described selection is carried out according to following method: with PS and several thresholdings TH_value (i) (i=1, ..., N-1) compare, thereby select wherein little high threshold than PS.Therefore, find that when travelling carriage PS is lower than certain thresholding Threshold1_1 during a period of time, promptly reduce request to the base station transmission rate; And when travelling carriage finds that PS is higher than certain thresholding Threshold1_2 a period of time Time1_2, promptly to base station transmission rate recovery request.The selection of the related thresholding TH_value of this method (i) is with reference to the soft handover thresholding T_add and the T_drop of current area, between T_add and T_drop.High threshold littler than PS in each speed threshold level of above-mentioned selection also can be carried out according to following method: calculate the poor DPS that concentrates the pilot frequency intensity PS1 of maximum in the pilot frequency intensity from the pilot signal strength average PS of home base station and travelling carriage stored candidate, with DPS and several thresholdings TH_value (i) (i=1, ..., N-1) compare, thereby select wherein little high threshold than PS.That is to say, the pilot tone PS1 (dB) of the intensity maximum of other that travelling carriage can search according to pilot frequency intensity PS (dB) and it of its its home cell of measuring constantly, after travelling carriage finds that PS-PS1 (dB) is less than some thresholding Threshold2_1 a period of times, promptly reduce request to the base station transmission rate; After travelling carriage finds that PS-PS1 (dB) is greater than some thresholding Threshold2_2 a period of times, promptly to base station transmission rate recovery request.The selection frame of reference soft handover thresholding of the related thresholding TH_value of this method (i) can be obtained by configuration database, when the soft handover thresholding is HO_T (dB), guarantees TH_value (1)＞=HO_T (dB), TH_value (N-1)＞0dB.

High threshold littler than PS in each speed threshold level of above-mentioned selection can also be carried out according to following method: the poor DPS that calculates the pilot frequency intensity PS1 of intensity maximum in the pilot tone Active Set of storing from the pilot signal strength average PS of home base station and travelling carriage, with DPS and several thresholdings TH_value (i) (i=1, ..., N-1) compare; Thereby select wherein little high threshold than PS.Promptly when travelling carriage enters soft handover, travelling carriage calculates the difference PS-PS1 (dB) according to pilot frequency intensity the strongest in the pilot frequency intensity of its its home cell of measuring constantly and the Active Set, after finding that this difference is lower than certain thresholding Threshold3_1 a period of time, just reduce request to the base station transmission rate; After travelling carriage finds that this difference is greater than certain thresholding Threshold3_2 a period of time, promptly to base station transmission rate recovery request.The selection frame of reference soft handover thresholding of the related thresholding TH_value of this method (i) can be obtained by configuration database, when the soft handover thresholding is HO_T (dB), guarantees TH_value (1)＜=HO_T (dB), TH_value (N-1)＞0dB).

Above-mentioned when determining each speed threshold level TH_value1 (i), i=1 wherein, ..., N-1, can carry out according to following proposal: according to the situation of system interference, two grades of the branch of data rate, one is original rate R1, another is the speed R2 that reduces, the speed grade that can select this moment sum N=1.The ratio of described R1 and R2 is set according to the speed grade that system allows.

Above-mentioned when determining each speed threshold level TH_value1 (i), i=1 wherein, ..., N-1 can also carry out according to following proposal: according to system interference in various degree, data rate is divided into a plurality of grades, grade from high to low, corresponding data rate is reduced successively by original rate, disturbs big more, the speed grade of distributing is low more, speed grade sum N＞1 that can select this moment.The division of speed grade is set according to the speed grade that system allows.Usually, the frame of reference data rate grade that can provide: the speed grade sum N of selection is between 3 to 5.

What need explanation also has, for travelling carriage provided by the present invention, the length of described register queue 104 can be with reference to the value of travelling carriage to the measurement period T of forward pilot, and determine according to following method: promptly register queue length and travelling carriage are 3～5 seconds to the product of the measurement period T of forward pilot.

Must be pointed out also that at last because the present invention adopts existing C DMA air interface protocol and corresponding construction, the hardware that is adopted and most of software all are ready-made.Therefore, by above description, those skilled in the art is not difficult to realize the present invention in cdma system.

Claims (9)

1, adjusts the method for forward service rate in a kind of cdma system, it is characterized in that: this method comprises travelling carriage speed adjustment process and base station speed adjustment process, wherein, travelling carriage speed adjustment process comprises the steps: (1) initialization, status register R is changed to the speed grade of business initial requirement; Register queue all is changed to the content identical with status register; (2) determine each speed threshold level TH_value1 (i), i=1 wherein ..., N-1, and TH_value (1)＞TH_value (2)＞...＞TH_value (N-1), wherein the speed grade sum of N for selecting; (3) measurement is from the pilot signal strength average PS of home base station; (4) the pilot signal strength average PS from home base station that obtains according to above-mentioned steps (3) selects in each speed threshold level that above-mentioned steps (2) determines the high threshold littler than PS, and remembers that this thresholding sequence number is k; If PS＜TH_value (N-1) remembers that then the thresholding sequence number is K=N; (5) register queue is carried out shifting function backward, incite somebody to action record deletion the earliest simultaneously, the threshold level k that obtains is pressed in the first register of register queue; (6) average speed grade CA in the statistic registers formation, and it is rounded processing; (7) current speed grade of preserving in CA and the status register is compared,,, continue execution in step (9) then as any adjustment if CA equals the content in the status register, if CA is not equal to the content in the status register, execution in step (8) then; (8) travelling carriage will send the request of the CA after to adjust speed grade be to round to the base station, simultaneously under the control of control unit, status register contents will be changed to CA after rounding; (9) control unit is operated Synchronization Control under timer control, and returns step (3) beginning next round and handle after the measurement period T of interval travelling carriage to forward pilot;

Base station speed adjustment process comprises the steps: that (1) and travelling carriage keep the base station reception of the communicate by letter message from travelling carriage; (2) judge the rate adjustment request whether message that above-mentioned steps (1) receives has travelling carriage to report,, the channel management unit is sent in this request, continue execution in step (3), otherwise carry out above-mentioned steps (1) if having; (3) the channel management unit is judged the rate adjustment request of the travelling carriage that receives, if this data service supporting rate change, and would support the speed grade that requires, execution in step (4), otherwise execution in step (6); (4) whether the current system loading of channel management unit judges allows to carry out rate-allocation, if system loading allows execution in step (5), otherwise execution in step (6); (5) distribute the speed grade that requires to give corresponding Channel Elements, finish this subrate adjustment operation then, return step (1) and continue operation; (6) keep the current speed grade in respective channels unit, keep the current data rate in respective channels unit, return step (1) and continue operation.

2, adjust the method for forward service rate in the cdma system according to claim 1, it is characterized in that: high threshold littler than PS in each speed threshold level of described selection is carried out according to following method: with PS and several thresholdings TH_value (i) (i=1..., N-1) compare, thereby select wherein little high threshold than PS.

3, adjust the method for forward service rate in the cdma system according to claim 1, it is characterized in that: high threshold littler than PS in each speed threshold level of described selection is carried out according to following method: calculate the poor DPS that concentrates the pilot frequency intensity PS1 of maximum in the pilot frequency intensity from the pilot signal strength average PS of home base station and travelling carriage stored candidate, with DPS and several thresholdings TH_value (i) (i=1, ..., N-1) compare, thereby select wherein little high threshold than PS.

4, adjust the method for forward service rate in the cdma system according to claim 1, it is characterized in that: high threshold littler than PS in each speed threshold level of described selection is carried out according to following method: the poor DPS that calculates the pilot frequency intensity PS1 of intensity maximum in the pilot tone Active Set of storing from the pilot signal strength average PS of home base station and travelling carriage, with DPS and several thresholdings TH_value (i) (i=1, ..., N-1) compare; Thereby select wherein little high threshold than PS.

5, adjust the method for forward service rate in the cdma system according to claim 1, it is characterized in that: described each speed threshold level TH_value1 (i) of determining, i=1 wherein, ..., N-1 can carry out according to following proposal: according to the situation of system interference, two grades of the branch of data rate, one is original rate R1, and another is the speed R2 that reduces, the speed grade that can select this moment sum N=1.

6, adjust the method for forward service rate in the cdma system according to claim 1, it is characterized in that: describedly determine each speed threshold level TH_value1 (i), i=1 wherein ..., N-1, can carry out according to following proposal: according to system interference in various degree, data rate is divided into a plurality of grades, and grade from high to low, corresponding data rate is reduced successively by original rate, disturb greatly more, the speed grade of distribution is low more, speed grade sum N＞1 that can select this moment.

7, adjust the method for forward service rate in the cdma system according to claim 1, it is characterized in that: the described speed grade sum N that can select is between 3 to 5.

8, a kind of travelling carriage that can realize adjusting in the described cdma system of claim 1 method of forward service rate, comprise emitting-receiving system (101), front end signal processing unit (102), timer (107), control unit (108), it is characterized in that: this travelling carriage also comprises the first many-valued comparator (103), register queue (104), the status register (105) and the second many-valued comparator (106), above-mentioned front end signal processing unit (102) and emitting-receiving system (101), the first many-valued comparator (103) interconnects, control unit (108) and front end signal processing unit (102), the first many-valued comparator (103), register queue (104), status register (105), the second many-valued comparator (106) and timer (107) interconnect, register queue (104) interconnects with the first many-valued comparator (103) and the second many-valued comparator (106), and status register (105) interconnects with the second many-valued comparator (106); Wherein, emitting-receiving system (101) is used for the reception and the transmission of radiofrequency signal; Front end signal processing unit (102) is used for the measurement of forward pilot intensity, the pilot signal strength PS of output home cell; The first many-valued comparator (103), PS and each thresholding of being used for measuring compare, the threshold level k after the output relatively; Register queue (104) is used to write down former thresholding comparative result repeatedly, and the threshold level of statistical average, and it is rounded processing; Status register (105) is used to write down current speed grade; The second many-valued comparator (106), be used for statistical average threshold level and current speed grade that register queue (104) obtains are compared, if statistical average threshold level and current speed grade equate, then export 0, otherwise output statistical average gets speed grade; Timer (107) is used for control unit is carried out timing; Control unit (108), the synchronous and control front end signal processing unit (102) that is used for each unit carries out period measurement, receives the output valve of the second many-valued comparator (106) simultaneously, if be output as 0, does not then do any change; If export non-vanishingly, then that rate adjustment request and other business tines are multiplexing or be inserted on the corresponding backward channel, revise status register (105) simultaneously for statistical average and through the speed grade after rounding.

9, adjust the travelling carriage of forward service rate in the cdma system according to claim 8, it is characterized in that: the length of described register queue (104) is with reference to the value of travelling carriage to the measurement period T of forward pilot, and determine according to following method: register queue length and travelling carriage are 3～5 seconds to the product of the measurement period T of forward pilot.

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