TW472469B - Adaptive power control in wideband CDMA cellular systems (WCDMA) and methods of operation - Google Patents

Abstract

A WCDMA system includes a base station (BS) transmitter, or forward transmitter and a pilot channel that transmits control signals between a BS and a mobile station (MS) to reconfigure their transmitter/receiver. This reconfiguration is performed according to the prediction of the channel power and the threshold set at the BS or MS based on its channel power probability density function separated into three distinct equal probable regions. Data signals are encoded using a one-half Viterbi encoder and interleaved. The interleaved data bits are modulated using quadrature phase shift keying (QPSK) modulation. The QPSK data is multiplexed with the pilot channel and spread by an appropriate code in an OFDM transmitter modified by a long code. Output of the transmitter may be provided to two diverse antennas for reliable communications to the receiver. Data may be received at two diverse antennas. The outputs are provided to match filters coupled to a coherent rake receiver and a channel prediction system. The future attenuation of the channel coefficients and power are determined by the prediction system for several milliseconds. In one embodiment seamless rate change (SRC/transmitter power control (TPC) logic uses the predicted channel power to signal both the transmitter and the receiver to reconfigure their transmit power level according to the pdf of the channel power and threshold level. A transmission rate is reduced when the power level is below the threshold and increased when the channel power is above threshold. The pilot channel is used to signal the mobile station and the base station. In another embodiment, transmission power control bits are entered into transmit slots according to the above scheme and thresholds. When the predicted channel power falls below the threshold, the BS or the MS increase transmit power by a predetermined level. When the predicted channel power is above the threshold, a predetermined level reduces the transmitter power. In still another embodiment, the BS or MS transmits the predicted channel power of the two diverse antennas to the remote side. MS or BS compares the power of the two channels with a threshold and selects the antenna that propagates through the better channel which reduces MAI and ISI. The three embodiments aid a WCDMA system in maintaining conductivity, maximizing throughput, and minimizing mobile station power consumption by adjusting transmit power, seamless rate change and transmit antenna diversity.

Description

472469 V. Description of the invention (1) Inventor: Ali S. Sadri This invention declares that the patent number 60 / 105,639 filed on October 26, 1998, is named " Seamless Rate Change In wideband CDMA Cellular System ( WCDMA), which has been transferred to the present invention and is listed here for reference only. Related patents The present invention relates to the ________ patent case number claimed in the " ADAPTIVE POWER CONTROL BASED ON A RA ^ RECEIVER CONFIGURATION IN WIDEBAND CDMA CELLULAR SYSTEMS (WCDMA) AND METHODS OF OPERATION " »(RA9-9 9-0 1 8/1 963-736 1) It has been assigned to the present invention and is only listed here for reference. BACKGROUND OF THE INVENTION _ (丄) Invention 笳, 餐 This meal is related to communication systems and operating methods. More specifically, the present invention relates to a suitable power management and operation method in a W C D M A system. ′, ^ ~~ Explanation of support technology, In the f-line communication system, the signal is attenuated due to multi-path radio transmission, which seriously reduces the efficiency and increases the power requirements of the high transmitter. Since a channel 1 = the sign changes rapidly 'so a transmitter and a receiver cannot operate at their maximum 1i level, so they cannot use the integrity of the wireless system: ^ Coded Multiple Access (C DM A) Since the capacity can be increased for each user's frequency band in this system,

472469 V. Description of the invention (2) Fee bandwidth. Several systems are proposed for third generation wireless systems. The most popular system under study is the Wideband CDMA (W-CDMA) system, which was published in May 1999 by B. Lindof, C. Ostberg, and H. Eriksson in the IEEE Vehicular Technology Conference Document 90 & quot Channel Estimation for the W-CDMA System, Performance and Robustness Analyses from a Terminal Perspective ". Developers of third-generation radio systems in the industry can foresee crystal-clear voice services, video conferencing from anywhere, high-speed mobile networks, and thousands of advanced applications in wireless phones or handheld personal computers. In general, any enhancement of the voice and video system that can improve high-speed data transmission and mobile devices with increased battery life is a challenging issue worth considering and improving. In T. Ue, S. Sampe i, N. Morinaga, and K. Hamaguch i in IEEE Transaction on Vehicular Technology, Volume 47, Number 4, pp. 1134-1147, November 1998, pages 1134-1147 Published name " Symbol Rate and Modulation Level-Controlled Adaptive Modulation / TDMA / TDD System for High-Bit-Rate Wireless Data Transmission ", and by S. Abe ta 'S. Sampe i, and N. Morinaga in IEICE Transaction on Communication, E80-B, No. 4, April 1997, pages 58 1-583 entitled "Adaptive Coding and Processing Gain Control with Channel Activation for Multimedia DS / CDMA System" in the literature by the author Information transmission feedback from base station (BS) to mobile station (MS)

Page 10 472469 V. Description of the Invention (3) A symbol rate, gain, and coding change method is proposed for use. In these proposals, the quality of the containment is determined on the basis of the calculation of the short-term signal and the interference rate CV (Nfl + IQ) on the BS receiver, where c is the signal power,% is the AWGN power 'and 10 is from Interference from other users. However, in a wideband environment, the signal-to-noise ratio (SNR) is not suitable for measuring channel quality due to the occurrence of inter-symbol interference (ISI). For example, c η w〇ng, and L. !! 31120 At 1 £ Vehicular Techn〇i〇gy (3) May 999 file "483" on page 483 of the document name " Upper_b〇und

Perfor.ance of a WUeband Bur s t-by-Burs t Adaptive Modem ". Other previous technologies related to improved efficiency WCDMA systems include: ^ 1 998 ^ 1Μ13θ (Tiede.ann) FREE. Hedemann, Jr. U .. SP 5, 822, 38, which is produced by I. One method and Device, supply level two n, port = transmission power of variable rate communication system. The disclosed method can be referred to as == road power control method. -The -remote station can control an acknowledgement by transmitting a -rate signal to the second remote communication system = according to the received power control signal and its transmission rate. Issued in February 1998 by qn. (Weaver) us' · WeaVei \ Jr ^ et ah, the issue of transmission power is another. 5, 71 5'526 series revealed to control one last several channels: two: f, a base station Y with a cellular communication system Electric frequency transmission! = (. Has a transmitter tracking gain ‘Υ, and a none, sheep pass wheel power‘ r. This device contains for calculating the expected power

472469 V. Description of the invention (4) Treatment Ύ

Pka-Pkf channel elements. Each of these channel elements is a corresponding channel. The device also contains a Transceiver System Controller (BTSC) for generating a desired turn-out power Yd of the base station, including an adder for summing these expected powers. The device also includes a transmission power detector for measuring 'Y' to obtain the measured transmission power. The device further includes a radio frequency interface card (RFIC) for generating 'Y'. Finally, the device includes a gain unit for the sum of I and gamma to obtain the final transmission power J 'usp. 5,383 issued by c. E. wheatley, in, (Wheatley) on January 17, 1995. 21 9 series revealed a power control process. Xu-mobile radiotelephone continuously updated the base station: the base station can send the data frame to the mobile station at a special rate: if the light station correctly receives and decodes the data frame The power transmitted to the base station & τ:: ° 丌 丌 ° and the power control bit to be received: 制 = system = material frame. According to this connection, the transmission power is reduced. The base station can decide whether or not To be added or disclosed on March 17, 1998 by cjn ρ 1 ς p R * ΗGardner & et al (Gardner) 2: s.P. 5, 729, 557 is a method and wearing, honeycomb style The digital helmet line Thunder II e μ μ + f is set at a

= The mother base station can broadcast the power U product · # at the base wheel power P 旳 忒 乘 power multiplied by pBR. Needed at the power level received at the base station, the power level received at the base station, and the J-subscription have determined its suitability: the power received by the mobile unit IV and the implementation of a plan; through iT: to be a strong hand Control calculations will return greater than the maximum of the action unit 472469

The value of the transmission power capability. In this case, the mobile unit can choose a lower bit rate. When the bit rate is reduced, the sensitivity of the base station receiver can be improved, and the result is similar to increasing the transmission power. In the preferred embodiment, the invention y uses three different code rates. In most cases, the code rate used is two-half, but when under strict conditions, the mobile unit decides that it needs a transmission power code that is larger than the ability to provide a code rate that changes to one-half. At this time, the bit rate can become one third. The JP6-276 1 76 series, issued by Tetsuyoshi et. Al. (Tetsuyoshi) on September 30, 1994, revealed that by preparing complex crystal ratios and appropriately disposing them to relatively remote stations, it reduces the number of Inter-signal interference from the remote station. When the power level of the received signal can be detected by receiving the power detection or signal from the remote station, a crystal rate determination circuit can determine whether the received power level causes strong interference and inverse spread demodulation of the signal. . In this case, the current crystal rate can be changed, and the remote station can be notified from the crystal rate notification circuit. At a remote station, a scatter code is generated corresponding to the crystal rate announced from the base station. The generation of a scatter code can be provided to a spectrum spread modulation section to perform spread spectrum spread modulation and transmit to the base station. Therefore, the base station can perform an inverse dispersion process through the crystal rate, and the interference can be reduced at these remote stations. In previous art systems, past estimates of the signal-to-interference ratio can be used to adjust the transmitter power. Due to the attenuation of the wireless channel, the received signal-to-interference ratio has not been estimated as an appropriate technique for optimal power control. No pre-filming technique can use the future prediction of the channel power and set the most appropriate threshold value based on the channel probability density Z energy to control the emission as the invention =

Page 13 ^ 2469 V. Description of the Invention (6) '---- and transmission rate. SUMMARY OF THE INVENTION An object of the present invention is, for example, a communication system of a WCDMA system and an appropriately adjusted operation method having a good system throughput, channel capacity, and transmission power control. Another objective is to use WCDMA system redundancy and operation methods, one of channel prediction and coherent change (SRC) / transmission power control (TPC) logic using power and transmission rate management. Another purpose is to use one of the WCDMA systems with improved and suitable power management in the WCDMA transmission time slot, and one of the WCDMA systems and operations. Another object is to improve one of the WCDMA systems and operation methods by using pilot bits suitable for transmitter differences with improved and appropriate power management. These and other objectives, features, and advantages are achieved in a WCDMA system and method with the most rounded amount, control channel capacity / transmission power, and Wit connections between a base and a mobile station through the following: ^) Channel prediction and SRC / TPC logic; (ii) transmitter power control bits in WCDMA transmitter time slots, and (iii) suitable transmitter difference (ADT) ^ A base or mobile transmitter system includes a pilot channel It can transmit control signals between a mobile station and the base station to reconfigure the transmitter based on the predicted future attenuation of the channel power and its possible density function (pdf). These information signals can be encoded by using a half Viterbi encoder and interleaving. The interleaved data bits 7L are mapped using 90-degree phase shift keying (QPSK) modulation. The QPSK data is generated through an appropriate right angle

472469 V. Description of the invention (7) Codes and long codes are multiplexed with pilot channels and distribution. The output of this transmitter can be supplied to different antennas that reliably communicate with the receiver. These forward and reverse system receivers are substantially similar. The data can be received on two different antennas. These outputs can be provided to matched filters that provide a coherent handle receiver and a channel prediction system at the base station. The future attenuation of the channel in milliseconds can be determined by the channel prediction system. In a specific embodiment, a coherent handle change (SRC) / transmission power control (TPC) logic can use the predicted channel power 'and set appropriate thresholds to the transmitter and receiver to reconfigure the transmission rate and power. signal. In this case, according to the set threshold value, when the predicted channel power level is within a threshold value level, the transmitter and receiver at the beginning of each WCDMA slot can modify its transmission rate. The dedicated pilot channel can be used to notify the mobile station or the United States f modified by the SRC. The SRC / TPC logic is also input to a coherent rake receiver, so that when a Viterbi decoding receiver that provides reliable communication with an output signal is provided and a new transmission rate is available, and the output is provided to the system, Bit π Π In another specific embodiment, the transmitter power is predicted from the above-mentioned critical channel power threshold: work: quasi-channel power drop-critical value, when the threshold value is on time, it is determined that the transmitter power increases. When the predicted channel is overpowered, incense will reduce the transmitter power at a predetermined level. In the embodiment where the θ J boundary value is still lacking, the base station may use the two # 1: ^ 隹 to continue with the other—with 仏 叙 a ^ ″ to the predicted channel power value of the two difference antennas $ :: 丁 动 σ. The air action platform can compare the power and power of the two channels: send and compare, and select the best channel route and the red boundary value.

^ ^ ^ ^ f # ^ ^ (MM

Page 15 472469 V. Description of the invention (8) '~~~ This embodiment helps a WCDMA system to maintain conductivity; it can reduce mobile station power consumption through optimal transmitter power or different transmitter antennas; and Provide transmitter and receiver repair and capability improvement. σ '' Brief description of the drawings, the present invention can be further understood from the following preferred embodiments in conjunction with the detailed description of the drawings, in which: FIG. 1 is a data frame structure shown in a WCDMA time slot of the system of FIG. 2 . Figure 2 shows the design of a base station and a mobile station in a WCDMA system in combination with the principles of the present invention. FIG. 2A is a block diagram of a base station transmitter in FIG. 2. FIG. 2B is a block diagram of a channel baseband model included in FIG. 2. FIG. 2C is a block diagram of the mobile or base station receiver in FIG. 2. FIG. FIG. 2D is a block diagram of a mobile station transmitter in FIG. 2. Figure 3 is a one-channel power probability density function (pd f) diagram with a chi-square random variable of two (2) degrees free in the system of Figure 2. Figure 4 is a comparison diagram of the channel's possible density function and power value at the beginning of each WCDMA slot. FIG. 5 is a pdf diagram of the channel of FIG. 2 divided into three equally possible regions. Fig. 6 is a flow chart of a base station transmitter in the system of Fig. 2 through the use of transmitter power control (TPC) of a WCDMA slot in power management. Fig. 7 is a flow chart of the base station transmitter in the Fig. 2 system when operating a Coherent Rake Variation (SRC). System. Figure 8 is a distribution in the system of Figure 2 when the transmitter rate is modified by a system

Page 16 472469 V. Description of the invention (9) Code selection flow chart. FIG. 9 is a flowchart of a base station transmitter in the system of FIG. 2 when operating a system with a suitable transmitter difference (ATD). Explanation of the preferred embodiment In the WCDMA system, symbols can be transmitted by using 90 degree phase shift keying (CDpsiq and direct sequence CDMACDS-CDMA). The crystal rate is 4. 096 MHz. Each physical channel is composed of a data frame structure, so that each time slot is composed of 2560 chips. This was published in the May 1999 IEEE Vehicular Technology Conference document 90 by B. Lindof, C.

Ostberg, and Η · Eriksson describe the literature name " Channel Estimation for the W-CDMA System, Performance and Robustness Analyses from a Terminal Perspective ". FIG. 1 illustrates a W-C D M A data frame structure 10, which includes time slots 0 to 15. Each data frame includes pilot bits 2 and transmitter power control bits 1 4. For downward linking, the 'pilot symbols' are time multiplexed with the data symbols, and each slot starts with a group of pilot symbols (4 or 8). These pilot symbols can be used to estimate or predict the channel and perform synchronization. The present invention proposes a suitable modulation technique for a WCDM A system 100 shown in Figs. 2-2D. It was published in September 1998 in IEEE Communication Letters, Vol. 2, No. 9 by T. Eyceoz, A.

Due deduced by Halien, and H. Hallen (Eyceoz), "Deterministic Channel Modeling and Long Range Prediction of Fast Mobile Radio Channels" describes one of the deductive methods for long-range prediction of mobile channels.

Page 17 472469 V. Description of the invention (10) In Fig. 2, a base station 101 is connected to a row of mobile stations 102 through a channel 103, as further shown in Figs. 2A-2D. In FIG. 2A, a base station or forward system transmitter includes a terminal for receiving a reverse transmitter signal. This supply is used as an input to an orthogonal code generator 106 and an interleaver 107. After processing through a Vj terb 1 encoder 丨 丨 0, the reverse transmitter signal can be combined with a source 1 0 8 combinations. The processed signals as data symbols can be divided into first and first channels of actual and virtual A and B, which can be coupled to a 90 degree phase shift keying (QPSK) unit 112. A multiplexer 116 may obtain channel A and channel β from the QpSK unit 112, and perform a time multiplexing on a pilot signal 丨 1 4 and a series of data symbols in the data frame 20 (refer to FIG. 2). Detailed description The shell frame, such as ° H, can be transmitted to a mobile receiver ι50 through Tong A through the use of a 0FDM code 106 modified by a spread or long code 118 (refer to FIG. 2c), which will be described in more detail later. The 2β system shows a baseband model 130 of the channel. Each channel model 2 1 white Gaussian noise (AWGN) 131 and -time relationship flat attenuation. ′ The selected attenuation is negligible due to multipath. In FIG. 2C, a /,. ^ 1 / Γ „Ding D or reverse system receiver 150 is similar to the base or heading receiver 17〇 (between soil 0, ^ receiver 152, 154, for connection: 2). Each receiver system includes a differential antenna that can match the output of the chirped wave, which can be provided to -phase; a system of matched chirped wave, 158, channel pre-, receiver 156, and-channel prediction or estimation of the millisecond channel future Fen '/ Tong may decide to reconfigure their stations as described in the previous Eyceoz literature. The time interval is sufficient to allow the base station and mobile backup to act as receivers. An SRC / TPC logic device

Page 472 469

Page 19 472469 V. Description of the invention (12) The following parties describe this relationship privately: P (r *) = 4-e'r *, r, r »where: P (y) is the channel power pdfy = a2; σ2 = Different. The pdf of the signal-to-noise ratio (SNR) at the receiver is shown in Figure 3 which describes the probability density function (pdf) of a chi-square assignment of random variables of 2 degrees of freedom, which has been in New York in 195 : McGraw Hill is described in more detail in a document published by John Proakis at Digital Communications. By applying a long-range channel prediction procedure, a base station (bs) can predict the channel power profile of a mobile station (MS) at a 10 ms prediction time in a W-CDMA data frame. In theory, the pdf of the predicted channel power would be similar to the pdf of Figure 3. We lead an experiment to demonstrate the efficiency of the proposed processing. In this experiment, we assume that the channel power prediction at the beginning of each time slot of a data frame duration is complete. The pdf of 4 independent identically assigned (I ID) channel powers of 40 has been calculated and described in Figure 4. By definition, the error probability of a BPSK (2 BPSK and QPSK) system can be estimated by the integral of the formula below. 〇 〇 P2 = jp2 (rMrb) drb

Page 20 472469 V. Description of the invention (13) The result system can be estimated by the following integral,

In the present invention, the pdf of the channel power can be divided into several regions, where the probability of each region is equal. Figure 5 describes a three-region pd f 0 of the channel power. In the case where the pdf is divided into three equally possible regions (0-A; A-b; B_), the region under the exponential curve of each region is equal to 〇. 333. In other words, the possibility of the system operating in poor, rated, and high-channel conditions is the same. In the three-zone system of Fig. 5, the above equation of the channel power can be changed as shown below. Below, Equation A is normalized in each region of their relative SNR values AB ^ ^ [pMp (yb) dYb ^) p2 {rb) p (jh) drb +] p2 (rb) P (r6) dyb Λ b ( Since the predicted power level of each transmission slot can be used at a mobile station (MS), a system can construct it at the beginning of each slot. In this case, the mobile station can optimize its transmitter base. : Error probability of a BS receiver. Optimization can improve system and quality by improving appropriate power control using the following techniques: (a) Transmitter power control (Tpc) provided in the ^ ⑶ ^ time slot Bits; Coherent Rake Variation (SRC) using pilot bits, and (c) Suitable transmitter using pilot bits 472469 5. Description of the invention (14) ---- Difference (ATD), as follows Indication: A. General procedure The mobile station transmitter can modify the transmitter power by changing a spreading factor (SF) according to a threshold set by the base station. In this case, the mobile station or base station can calculate "β and C " Values (Figure 5). These values were selected for system operation in the low power region (0-A) time 33%, 33% of the power level (AB) and 33% in the higher power region (B_⑺) ^ Since the total average power 疋 1 ', the long-range average power of the 3 area systems is also equal to 1. β. Transmitter power control ( Tpc) 畲 system operates in TPC mode, and when the predicted channel power drops 11 Α-0 " range, the system will increase the transmitter power of 3 ⑽. When the measured channel power exceeds, β " range, the system will It will reduce the transmitter power by 3 dB. Finally, the system will not adjust when the predicted channel power is between “A and”. Figure 6 shows that when the system operates in Tpc mode = A flowchart 6 〇, which is as follows: At the beginning, the system can receive a frame of coherent rake change command (SRC) 62. A test 64 is executable, where the Tpc bits are available Gap check. When the predicted power (P) is in the range of 0_A, the system increases the rate by 3 dB through the reduction rate in step 66, and ς = power (in the range of P Qing, the system can pass two plus Rate and reduce the emission crying rate by 3 dB. Reports Chu, al A Xuan Yue Qi this m hand field 0 When the predicted power is within the range of A and B, the system does not adjust the transmitter power. '#Circle c. Coherent Rake Variation (SRC) Figure 7 shows the operation of the system in the Coherent Rake Variation (SRC) mode. A process

Page 22 472469 V. Description of the invention (15) Figure 70: At the beginning, the system can receive a coherent rake change command (SRC) 72. A test 74 is performed in which the SRS bits can be checked at each time slot. When the predicted channel power drops " A ,, " the transmission rate is reduced at step 76, and a longer scatter code (2 * SF) is used. At step 78, when the predicted channel power exceeds the " B ,, " range, the transmitter rate increases and a shorter scatter code (丨 / 2 * SF) is used. Finally, when the predicted channel power is between "eight and six", the system will not adjust. The 'one deduction method in Figure 8 can adjust the scatter code (: (1). When the predicted channel power is When a critical value is dropped, the transmission rate is reduced, and a longer scatter code is used. In block 84, 'when the threshold is exceeded, the scatter code is doubled. The scatter code will be 88 increases to 4 and 8. When the predicted channel power exceeds a critical value, the transmitter rate increases, and a shorter spread rate scatter code can be used as shown in blocks 85, 87, and 89. When the channel power is at the critical level, the stray code is not available; D. Adaptive Transmitter Difference (ATD) map is a flowchart describing base 2 when the system uses the appropriate transmitter difference operation 90. When the system is operating in ATD mode, the base σ receiver can receive the power (p) command from step 92 to predict the channel power of the two input receivers. The base station can guide the The predicted channel power values are transmitted to the receiver. Boundary value is compared, and the transmitted power value selected from two transmit antennas ㈣2 This process can;. J transfer level down transmission path, and a base station and mobile

472469 V. Description of the invention (16) The roles of the stations are interchangeable, so that the base station ^ " performs antenna selection ' Summarized the use of the system, the phase transmitter difference in one call it orthogonal data communication and reception and the whole though a different spirit of the WCDMA system has been revealed in the transmitter power control bit (TPCB) the appropriate channel power control dry rake Changes, and / or appropriate variations through the use of pilot bits. The WCDMA system supports the adjustment of variable rate and code generation length by constructing its receiver and transmitter to establish the determined data rate, and seeks the power level at the transmission. As a result, Η ;;; signal, to adjust the transmission to maintain the connection, the channel Rongdan a plus, when reducing the power of the wheel can be justified. The present invention has been changed in a preferred embodiment a, so as not to deviate from the description as shown in Annex II, but with different scopes. The invention as defined by the patent

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Page 25

Claims (1)

472469 6. The scope of patent application 1. A wideband coded multiple access (" WC D Μ A ") system, which includes a base station and a mobile station; a channel, which includes one with a variable transmission rate A baseband signal and a pilot channel comprising one of the base station and the mobile station; a device for predicting future power attenuation on the channels in response to the baseband signal; and a device for responding to the channel to predict The transmitter and receiver devices are notified on the pilot channel to reconfigure the transmission rate based on the predicted power attenuation. 2. The system of item 1 of the patent application scope further includes establishing a power threshold in the channel. 3. If the system of item 2 of the scope of patent application, further includes a device for increasing the transmission rate when the predicted channel power exceeds the critical value. 4. The system according to item 2 of the patent application scope, further comprising a device for reducing the transmission rate when the predicted channel power falls below the transmission rate. 5. The system according to item 1 of the scope of patent application, further comprising means for transmitting a data signal on the channel by using an 0 F D M code and a long code corresponding to the orthogonal code length negotiated during transmission. 6. If the system of item 1 of the patent application scope further includes a QPSK modulator, it is used to process the baseband signals. 7. If the system of claim 1 is patented, further comprising multiplexing the baseband signal with the pilot signal; and extending through an appropriate orthogonal code and a long code corresponding to the orthogonal code length negotiated during transmission The multiplexing signal device. Page 26 472469 6. Patent application scope 8. The system of the first patent application scope further includes a device for transmitting the baseband signal in a series of data frames, each data frame including a plurality of transmission time slots; included in each A group of pilot signals and a group of devices for transmitting power control signals in a time slot; a device for checking these transmission power control signals for each time slot; a device for checking each time slot of the transmission power control signal indicating the power of the channel Means for increasing the transmitter power when the predicted channel power falls below the critical value; and means for reducing the transmitter power when the predicted channel power exceeds the critical value. 9. If the system of item 1 of the patent application scope further includes a device for receiving a baseband signal of a series of data frames, each data frame includes a channel power value; used to check the two antennas related to the base station and the mobile station A device for these power values; and a device for selecting a transmitting antenna after comparing the power value of each antenna to a threshold value. 10. —A method for controlling Dongliang's throughput, channel capacity, and transmission power in a " WB C DM A " system, which includes a base station transmitter and receiver, A mobile station transmitter and receiver, dual channels, each channel includes a baseband signal with a variable transmission rate and a pilot channel coupling the base station and the mobile station, which includes the following steps: Page 27 472469 VI. Patent application scope Predict future power attenuation on these channels; and notify the transmitter and receiver on the pilot channel to reconfigure the transmission rate based on the predicted power attenuation. 11. The method according to item 10 of the patent application scope further comprises the following steps: Establishing a power threshold in these channels. 1 2 The method according to item 11 of the scope of patent application, further comprising the following steps: when the predicted channel power exceeds the threshold, increasing the transmission rate. 13. The method according to item 12 of the patent application scope further includes the following steps: when the predicted channel power falls below the set threshold, the transmission rate is reduced. 14. The method according to item 13 in the patent application scope further comprises The following steps: A data signal is transmitted on the channel by using a 0 FD MM code and a long code according to the transmission rate. 15. The method of claim 10, further comprising the step of processing the baseband signal by using a QPSK modulator. 16. The method according to item 1 of the patent application scope, further comprising the steps of: multiplexing the baseband signal with the pilot signal; and expanding the multiplexing by an appropriate orthogonal code and a long code corresponding to the transmission rate. signal. Page 28 472469 VI. Patent application scope 17. The method of patent application scope item 16 further includes the following steps: transmitting the baseband signal in a series of data frames, each data frame including a plurality of transmission time slots; at each The time slot includes a group of pilot signals and a group of transmission power control signals; check the transmission power control signals in each time slot; check each time slot of the transmission power control signal indicating the channel power; when the predicted channel power When the threshold value is dropped, the transmitter power is increased; and when the predicted channel power exceeds the threshold value, the transmitter power is decreased. 18. The method of claim 10 in the patent application scope further includes the following steps: receiving a baseband signal in a series of data frames, each data frame including a channel power value; checking the two antennas related to the base station and the mobile station The power values; and after comparing the power values of each antenna with a threshold value, selecting a transmitting antenna. 19. If the system of claim 1 is patented, the device for reconfiguring the transmission rate further includes: defining a channel power split into three equal first, second, and third possible regions Sexual density devices; and devices for operating the system in a transmission power control mode, such as Page 29 472469 6. The scope of patent application If the predicted future power attenuation falls into the first possibility region, the power of the transmitter will increase; if the predicted future power falls into the third possibility region, the power of the transmitter will Reduced; and if the predicted future power attenuation falls into the second probability region, no transmitter power adjustment is required. 20. The system of claim 1, wherein the device for reconfiguring the transmission rate further comprises: defining a channel power split into one of three equal first, second, and third possible regions. A device for operating the density in a coherent rake mode, and a device for operating the system in a coherent rake change mode, wherein a data frame includes a coherent rake change command bit indicating a predicted channel power, whereby if the predicted future attenuation falls into the In a region, the transmission rate of a transmitter can be reduced, and a longer scatter code can be used; if the predicted future power attenuation falls into the third region, the transmission rate of the transmitter can be reduced, and A short scatter code; and if the predicted future power attenuation falls into the second possibility region, no power adjustment is required at the transmitter transmission rate and scatter code. 2 1. The system of item 1 of the patent application, wherein the device for reconfiguring the transmission rate further comprises: a device for operating the system in a suitable transmitter differential mode, one of which can predict multiple antennas Future channel power attenuation, and the predicted channel power values of each antenna can be transmitted to another station via a pilot bit; used in another station to compare the predicted power values of each antenna with a critical value Comparable devices; and Page 472 469 Page 31