TW595144B - Power control method for CDMA communication system - Google Patents

Abstract

A CDMA communication system has a system control center and a plurality of cells. Each cell has a base station and a plurality of mobile stations. The power control method includes calculating an interference index related to signal transmission between each base station and each mobile station, and assigning a signal output power to each base station in down-link mode or each mobile station in up-link mode. The interference index is calculated by dividing total power related to all signals received by the base station in down-link mode or the mobile station in up-link mode by a corresponding link gain corresponding to a specific transmission route between a source base station and a target mobile station in down-link mode or a source mobile station and a target base station in up-link mode.

Description

595144 V. Description of the invention (l) '~~ The technical field to which the invention belongs The present invention provides a method for controlling signal transmission power of a wireless communication system, and more particularly, it applies to a code division multiple access wireless communication system = power control method. '' Previous technology code division multiple access (CDMA) technology is one of the transmission technologies commonly used in current wireless communication systems. This code division multiple access technology was originally developed for military communications needs. But in recent years In the general civilian market, it has become a reliable and efficient wireless communication method. However, since commercialization, the benefit line system suppliers and users have generally accepted the technology, which also makes it possible to use multi-code to store; Wireless communication systems based on technology are rapidly gaining popularity. Generally speaking, the code division multiplexing access technology belongs to a spread spectrum technology, and spread spectrum is the modulation of a data so that the data can pass through a wider frequency band b ^ d), the transmission is carried out, that is to say, the data is expanded to scatter it in the frequency band. In the process, the transmission data can be prevented from being easily captured by the X-ray signal. Spread the step ™ t ^ number, while suppressing others in the same band $ :: 所 $ $ It is said that the data is converted to a corresponding spread through a transformation E (x silk 仏 5 tiger). Frequency :) Coffee 44 ^^ _ V. Description of the invention (2) The operation details of Λ are shown as follows. Refer to Figure 2 and Figure-. Figure 2 is a predetermined frequency i ^ of the conventional frequency spreading technique. The frequency domain (freqUency domain) has the narrow frequency Ϊΐ j bandwidth) Bn 'as shown in Fig. 1 (A), but (c) passes H m f1] through a conversion E (X) and a code c, also That is, E uses this narrow phase to convert to a spread spectrum signal Sw. As shown in FIG. 1 (B), the number on Bw is extended to a larger bandwidth through the conversion E (C). You can use the conventional spread spectrum technology to perform the operation, such as holographic column (dlrect seQuence) or frequency hopping (frequency one after another to complete, so the spread spectrum signal Sw will be transmitted to the exchange 4 ^ End (r, eCeiVe〇 ', the receiving end must use the same conversion = CX) and code c to further restore the spread spectrum signal S w to the original: can be used as Sn' as shown in Figure 1 (C). Literal multiplexed access ^ knows that multiple signals are transmitted on the same frequency band or well Channe 1) using different codes c, and only the number ^ Λ with a predetermined code c will be received by the receiver The original narrow-band signal is restored, and the spread-spectrum signal with other codes will not be restored by the receiver. In Figure 2 (A), two independent narrow-band signals Snl and Sn2 are shown. The knife type represents different data. The narrow-band signal Snl is converted into a spread-spectrum signal Sw 1 by a conversion formula E (χ), a code c 1, that is, E (c 1), and the narrow-band signal S η 2 is transformed into a spread-spectrum message by the same transformation E (χ) and another code c 2, that is, E (c 2) s w 2, Figure II (Beta), the spread spectrum signal so Swl, Sw2 are to be transmitted via the same system bandwidth 595144

V. Description of the invention (3)

The last receiver uses the conversion type E (c 1) to restore the spread-spectrum signal Swl corresponding to the code c 1 to the original narrow-band signal Snl, as shown in FIG. 2 (C). ^ 'Although the receiver will also receive To the spread spectrum signal S w 2, but it does not use the code c2 to restore the received spread spectrum signal Sw2 to its corresponding narrow-band signal Sn2, so for the receiver, the narrow-band signal Snl and the spread-spectrum signal The signal Sw2 will coexist and the signal will overlap, as shown by the slanted area in Figure 2 (c). For the narrow-band signal Sn 1, the overlapping part of the signal is regarded as interference. If multiple narrow-band signals are transmitted through the same frequency band, for one of the narrow-band signals, the remaining narrow-band signals are regarded as For interference, if there is too much interference, the signal of the narrowband signal is relatively weaker. Therefore, the narrowband signal may be regarded as noise by the receiver because the signal is too weak, that is, it may be at the calling end and the receiving Communication between the two devices. Please refer to FIG. 3, which is a schematic diagram of a conventional wireless communication system 10. The wireless communication system 10 includes a plurality of communication units (ce 1 1) 1 1 and a control center (system control center (SCC) 12). Each communication unit 1 1 corresponds to a communication area 1 3, and the communication area 1 3 It includes a base station 14 and a plurality of mobile communication stations (m 0bi 1 estati ο η) 16. The base station 1 4 is used to control the plurality of mobile communication stations 16 in the communication area 13. Communication, a mobile communication station 16a (such as a mobile phone) transmits a wireless communication signal to the base station 14a, and then the base station 14a transmits the wireless communication signal to the mobile communication station 16b, so the mobile communication station 1 6 a can be performed with mobile communication station 16 b

Page 11 595144 V. Description of the invention (4)

Call or message transmission. As mentioned above, in each communication unit ^, the base station 14 and each mobile communication station 16 will transmit a plurality of signals. For mobile communication station 16a upload (up_l ink) — As for the wireless communication signal to the base station i4a, if the mobile communication station 16 & outputs the wireless communication signal with a power Pa, the wireless communication signal will be transmitted to the base station 14a through a transmission path. Since the wireless communication signal is based on It is transmitted wirelessly, so the signal strength of the wireless communication signal is extremely vulnerable to environmental influences. For example, the longer the distance between the mobile communication station 16a and the base station 14a, the more severe the signal degradation, or the During transmission control, the signal is attenuated by high mountains or buildings. Therefore, the transmission path corresponds to a transmission gain (Ga), which is used to represent the power attenuation of the wireless communication signal by the transmission path. Therefore, the strength of the wireless communication signal transmitted by the base station 14a to the mobile communication station 16a is Pa * Ga. For the base station 14a, the mobile communication stations 16b and 16c will also transmit different signals to the base station Ua through different transmission paths (the transmission gains are Gb and Gc respectively) with power Pb and PC, and the mobile communication stations 16b and 1 The signal transmitted by 6c is the interference signal of the signal transmitted by mobile communication station 6a (as shown in Figure 2). In addition, for the mobile communication stations 16d, 16e, and 16f, when the mobile communication stations 16d, 16e, and 16f = power Pd, Pe, and Pf respectively transmit signals to the base station Ub, due to wireless transmission

= ^ Direction: The output signals of mobile communication stations 1 6 d, 1 6 e, and 16 f ^ will also be transported to the base station Ha through different paths (the transmission gains are Gd, Ge, and Gf, respectively). When the mobile communication stations i6g, 16 and 16 transmit signals to the base station with power Pg, Ph, pi,

Page 12 595144 V. Description of the invention (5) Because wireless transmission is non-directional, the output signals of mobile communication stations 16g, 16h, and 16i will also pass through different paths (the transmission gains are Gg,

Gh, Gi) and transmitted to the base station 14a. Therefore, each base station 14 will receive signals output from all mobile communication stations 16 in the wireless communication system 10. For example, without considering the noise existing in the wireless communication system 10, the 'received signal strength indicator (RSSI) of the base station 14a is RSSI = Pa * Ga + Pb * Gb + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg.Ph * Gh + Pi * Gi For signals transmitted from mobile station 1 6 a to base station 1 4 a, the signal strength is P a * G a, so for the base station 1 4 a, the signal-to-interference rat i 〇 (SIR) corresponding to the signal is τ τ η ___ ρα% 0α. 1 Ι \-Pb * Gb + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg + Ph * Gh + Pi * C5i 'So if other mobile communication stations 1 6 transmit to base station 1 The greater the signal strength of 4a, the relatively weaker the signal transmitted by mobile communication station 16a to base station i4a 'is, so its communication quality is also worse. If the output power of mobile communication station 6a is increased, the communication quality of mobile communication station 16a can be improved (because the signal / interference ratio is improved), but the signal output by mobile communication station 16a will affect other Relative of signals transmitted by mobile communication station 6

Page 13 595144 V. Description of the invention (6) The response signal / interference ratio, that is, as the signal strength of the mobile communication station 16 a increases, the interference to other mobile communication stations 16 will also increase at the same time, reducing other mobile communications. The signal / interference ratio of the transmission signal of the station 16 further reduces the communication quality of the other mobile communication stations 16. In addition, if the output power of the mobile communication station 16a is too large, it will increase the power consumption of its power supply (such as a battery). Similarly, for the base station 14a to download a down-link wireless communication signal to the mobile communication station 16a, if the base station 14a outputs the wireless communication signal to the mobile communication station 16a at a power Pa, the wireless communication The signal is transmitted to the mobile communication station 16a via a transmission path. Since the wireless communication signal is transmitted wirelessly, the signal strength of the wireless communication signal is extremely vulnerable to environmental influences and is attenuated. For example, the mobile communication station 16a The longer the distance from the base station 1 4 a, the more severe the signal attenuation, or the transmission path will be blocked by high mountains or buildings to attenuate the signal, so the transmission path will correspond to a transmission gain (1 ink gain). Ga is used to represent the degree of power attenuation of the wireless communication signal by the transmission path. Therefore, the strength of the wireless communication signal transmitted by the mobile communication station 16a to the base station 14a is Pa * Ga. For example, it will also transmit different signals to the mobile communication stations 16b and 16c with power Pb and Pc respectively. Since the wireless transmission is not directional, the base station 14a outputs Out to mobile communication stations 16b, 16c will also be transmitted to mobile communication station 16a via different transmission paths (transmission gains are Gb and Gc, respectively), so mobile station 16a receives base station 1 4a Output to mobile communication station 1 6 b,

595144 V. Description of Invention (7)

A 16 C signal is considered an interference signal (see Figure 2). However, for the base station 1 4 b, when the base station 1 4 b transmits signals to the mobile communication stations 16 d, 16 e, and 16 f at powers P d, P e, and pf, respectively, the wireless transmission has no direction. Therefore, the output signal of the base station 1 4 b will also be transmitted to the mobile communication station 16 a through different paths (the transmission gains are G d, G e, and G f respectively). Similarly, when the base station 1 4 c is separately When transmitting signals with power P g, ph, and pi to mobile communication stations 16 g, 16 h, and 16 i, since wireless transmission is not directional, the output signal of base station 1 4 c will also pass through different paths (transmission The gains are Gg, Gh, Gi) and transmitted to the mobile communication station 16a. Therefore, each mobile communication station 16 will receive the signals output by all base stations 14 in the wireless communication system 10. For example, without considering the noise existing in the wireless communication system 10, mobile communication The receiving strength of station 16a is RSSI = Pa * Ga + Pb * Gb + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg + Ph * Gh + Pi * Gi and for the base station For the signal transmitted from 1 4 a to the mobile communication station 16 a, the strength of the signal is Pa * Ga, so for the mobile communication station 16a, the corresponding signal / interference ratio of the signal is

Ο Τ Π --- Pa * Ga_ 〇I IV — Pb * Gb + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg + Ph * Gh + Pi * Gi So if other base stations 1 4 Signal strength transmitted to mobile station 16a

Page 15 595144 V. Description of the invention (8) The greater the 'then the signal transmitted from base station 1 4a to mobile communication station 16a is relatively weak, so its communication quality is also poor, but if base station 1 4a The increased output power can improve the communication quality of mobile communication station 16a (because the signal / interference ratio is increased), but the base station 14a outputs to the line, and the signal of communication station 16a will affect other mobile communication stations1 Corresponding signal / interference ratio of the received signal ^ tiger, that is, because the strength of the signal output from the base station 14a to the mobile communication station 16a is increased, the interference to other mobile communication stations 16 will also increase and decrease at the same time. The other mobile communication station 16 receives the signal / interference ratio of the signal, and further reduces the communication quality of the other mobile communication station 16. Therefore, in order to make each mobile communication station 16 in the wireless communication system 10 have the same call quality, that is, whether it is a signal upload or a signal download ', so the signal between each base station 14 and the mobile communication station 16 The / interference ratio needs to approach the same predetermined value. Since the environment of the wireless communication system 10 is constantly changing, and the mobile communication station 16 (such as a mobile phone) may move with the user, the wireless communication system 10 must be continuously adjusted through the control center 12 The power output of each base station 14 and the mobile communication station 6 allows each mobile communication station 16 to have the same call quality. The conventional technology uses a matrix (matri X) to represent the transmission gain corresponding to the signal transmission between each mobile communication A 1 6 and the base station 14, and calculates the power of the matrix (eigenvalue) for power Control operation, so if the wireless communication system 10 has a plurality of mobile communication stations i 6, the corresponding matrix operation will be very complicated, and the required operation circuit will also be necessary.

595144 V. Description of the invention (9) Must have strong operation capabilities to perform real-time processing to adjust the signal output power of base station 14 and mobile communication station 16, so the conventional technology is not only costly but also difficult to implement. 〇n). SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to provide a signal transmission power control method for an easy-to-implement wireless communication system to solve the above problems.

The patent application scope of the present invention provides a power control method applied to code division multiple access (CDMA) wireless communication. The wireless communication system is a Dili system and a plurality of communication units (ce 1 1), each

The "traditional number of bets" includes a base station (ba sestati oη) and a plurality of access orders, > (〇b 丨 1 estati ο n). The signal transmission power control action includes the following steps: Correspondence method of each communication element is at least ^ | Do not transmit a base station with a corresponding power wireless communication signal, " a plurality of mobile communication channels within the communication element, each number, I #multiplex action The communication station calculates its interference coefficient (in 7erference of the communication unit and the control center based on the interference index of each mobile communication station); to set the proportional relationship between the corresponding bases of the plurality of communication units The power of wireless communication signals.

Page 17 595144 V. Description of Invention (ίο) The scope of patent application of the present invention also provides a power control (p 〇werc ο ntr ο 1) applied to code division multiple access (CDMA) wireless communication systems In a method, the wireless communication system includes a control center and a plurality of communication units (ce 1 1), and each communication unit includes a base station and a plurality of mobile stations. The signal transmission power control method includes at least the following steps: each of the plurality of mobile communication stations transmits a wireless communication signal with a corresponding power to a base station of the corresponding communication unit; the base station of each communication unit calculates its Corresponding interference coefficient of each mobile communication station; and the control center sets mobile communication stations of a plurality of communication units to transmit to corresponding base stations according to the proportional relationship between the total output power of the signal and the interference coefficient of each mobile communication station. Power of wireless communication signals. Implementation mode Please refer to FIG. 3 and FIG. 4. FIG. 4 is a diagram of the first signal transmission function m 发明 of the present invention. As described above, the 'wireless communication system 1'. According to the message, the transmission direction can be divided into the base station 14 download (downi signal to mobile communication station 16 and mobile reading A 1 6 up r. ♦ 5 secrets a 1 d Jiu Jiong Tong Tong. Ib upload (up -1 ink) 讯 说 士 二 # Γ, which respectively correspond to different power control methods. First, this example illustrates the base station 14 download (d〇wn_Un 制动 通 # port 16 signal transmission wheel power control method). , Which contains the following columns u to step 595144

V. Description of Invention (11)

vStep 10: The mobile communication station 16 detects the total power of all received signals and the transmission between the mobile communication station 16 and a corresponding base station 14. The mobile communication station 16 and the base station 14 are both located in the same communication unit 11; Step 102: The mobile communication station 16 calculates an interference coefficient (inferferenCe index) based on the total power of all the received signals and the increase in illegal transmission. ^ Step 1 04: The base station 14 calculates a system power allocation parameter, which is the sum of the interference coefficients of each mobile communication station 6 in the communication unit 11 in step 5; Step 106:-Control Center 1 2 According to the system power distribution parameters of each base station 14, set the system power that the base station 14 can use to output signals; Step 108: The base station 14 according to its system power and each of the mobile communication stations 16 The interference coefficient is used to set the signal power used for output to a mobile communication station. 6 Perform step 100. —— Yifei r 々g to jji

Mobile communication station 16 such as base station 1 "outputs signals to Mobile Communications 16a, 16b, 16c respectively, base station 14b outputs signals to Mobile Communications 10d, 16e, 16f, and base station He outputs signals to redundancies, respectively. 16g, 16h, 16 丨 As mentioned above, wireless transmission is not agricultural. Therefore, for each mobile communication station 16, it will receive all the signals transmitted by the mobile communication system 10 (by each base station). 1 4 ^ ^, out), for mobile communication station 16a, its corresponding signal / interference ^ t

595144 V. Description of the invention (12) is SIRa =

Pa * Ga + Pb * Ub + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg + Ph * Gh + Pi * Gi-Pa * which defines an interference coefficient Ca, which is based on mobile communications Total power of all signals received by the station 16a from the wireless communication system 10 (Pa * Ga + Pb * Gb + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * G8 + Ph * Gh + P1 * Gi) and the ratio of the transmission gain Ga between the mobile communication station 16a and the base station 1 4a, that is, P — Pa * Ga + Pb * Gb + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg + Ph * Gh + Pi * Gi

La— 〇a So p id USIRa can know P x = in the same way, where x = a ~ i, so if each mobile communication station 16 in the wireless communication system 1 〇 corresponds to the same signal / interference Ratio so that each mobile communication station 16 has the same call quality (that is, the same SIR value), then the base station 14 outputs a signal to a mobile communication station 16 and the signal power interferes with the corresponding mobile communication station 16 The coefficients are directly proportional, so the signal power output from the base station 14 to a mobile communication station 16 can be further adjusted according to the interference coefficient to balance the signal / interference ratio, even if each action is 595144. Explanation of the invention (13), both stations and 16 correspond to the same signal / interference ratio. In this embodiment, each automatic communication station 16 will detect all the two, fj sums received from the wireless communication system, and the corresponding base station u to transmit the round signal to the action indicator. 16 蚪 transmission gain (step 丨 〇〇), and further a coefficient ^ step 102), and finally transmitted its interference coefficient to the base station / station 14, in order to move the communication stations 16a, 16b, 16c will transmit their The interference coefficients a, Cc reach the base station 14a 'and the mobile communication stations 16d, 16e, 16f will transmit their interference coefficients Cd, Ce, and even the base station Ub, and the mobile communication stations 16g, 16h, and 16i will transmit their interference coefficients eg , Ch, Cif base station 14c, and then each base station 14a, 14b, 14c will separately calculate its system power allocation parameters Ha, Hb, He, the system power allocation parameters are the sum of the interference coefficients, that is,

Ha = Ca + Cb + Cc Hb and Cd + Ce + Cf Hc-Cg + Ch + Ci and for the base station 14a, its system power (Pa + Pb + Pc) output to the mobile communication stations i6a, 16b, 16c for

Pa + Pb + Pc:

When the signal / interference ratio is balanced and equal, 595144 of the base station 丨 4 a. 5. Description of the invention (14) The system power will also be proportional to the system power distribution parameters, that is,

Pa + Pb + Pc = 2 * (Ca + Cb + Cc) = 2 * Ha Similarly, when the signal / interference ratio reaches equilibrium, the system power of base station 14 is proportional to its system power allocation parameter, so The control center 12 can reset the system power that each base station 14 can use to output signals according to the system power distribution parameters of each base station 14 to further balance the signal / interference ratio of the wireless communication system 10 (step 106), and finally each base station 14 controls the signal power output to the mobile communication station 16 according to the interference coefficient of each mobile communication station 16. In this embodiment, the control center 12 allocates the system power that each base station 14 can use to output signals according to the system power allocation parameters of each base station 14 and then each base station 14 then according to the corresponding mobile communication station The ratio of the interference coefficient of 16 is used to allocate the output power to the corresponding mobile communication station. 6 In other words, the first signal transmission power control method of the present invention is based on all actions in the wireless communication system 10. The proportion of the interference coefficient of the communication station 6 is used to distribute the signal power output to each mobile communication station 6 'Please note that the calculation of the interference coefficient is performed by each mobile communication station 6. For example, when the first period, the base stations 14a, 14b, and 14c of the wireless communication system 丨 〇 use the system powers Qal, Qbl, and Qcl, respectively.

Page 22 595144 V. Description of the invention (15) To allocate the power of each transmission signal Pal, Pbl, Pci, Pdl, Pel,

Pfl, Pg, Phi, Pil, so the interference coefficients calculated by each mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i are Cal, Cbl, Cel, Cdl, Cel, Cf and Cgl , Chi, C i 1, so the system power distribution parameters of base stations 1 4 a, 1 4 b, 1 4 c are Hal, Hbl, Hcl, respectively. If the total signal output power of the wireless communication system 10 is a predetermined value Q t, so the control center 1 2

Hal + Hbl + Hcl 14a, 14b, 14c system power allocation parameters Hal, Hbl, Hcl to allocate base stations 1 4 a, 1 4 b, 1 4 c system power used in the second period Qa2, Qb2, Qc2 , Which is Qa 2 =

Ha \ + Hb \ + Hc \

Hal + Hbl + Hcl

Qb2 Qc 2 = < 5 ^ 2 Oil + C2 > 1 + 0: 1 Q〇2 Cal + Cb \ + Ccl Qa2 Ca \ + Cbl + Ccl The base station 14a outputs to the mobile communication stations 16a, 16b, 16c The signal powers Pa2, Pb2, and Pc2 are Pa2 = P b 2 = two-two ...,

Pc2 = signal output from base station 14b to mobile communication station 16d. Pd2, Pe2, and Pf 2 are Pd2 = 16e and 16f respectively.

Cd \ + Ce \ + Cf \ * Cd \

Page 23 595144 V. Description of the invention (16)

Ctfl + Cfel + C / l & 2 Gil + Cel + C / 1

Pe2 2 Pf 2 = base station 1 4c output to mobile communication station igg 卩 宫 2 ,? 112?丨 2 are the signal power of Pg2 = Ph2 = Pi2 = 16h, 16i

Cgl + CAl + CSl 0 = 2 cgi + Oii + ai " Cgl

Cgl + Cfcl + CSl * a \ Then, each mobile communication station 16a, i6b, i6c, 16d, 16e, 16f, 16g, 16h, 16i, and then recalculate its perturbation coefficient, and use the same as above Step to perform power control in the third period. ′ Please refer to FIG. 5, which is a flowchart of a second signal transmission power control method according to the present invention. This embodiment describes a method for controlling the transmission power of the signal transmitted by the mobile communication station 6 to the base station 14 (i 1 nk). I includes the following steps: ^ Step 2 0 0: — The base station 14 detects all the received signals. The sum of power, and the transmission gain between the base station 14 and a mobile communication station 丨 6, and the mobile communication station 16 and the base station 14 are both located in the same communication unit 丨 丨 ^, step 2 0 2: The base station 14 calculates the interference index corresponding to each mobile communication station 16 according to the sum of the power of all the received signals and the delta transmission gain, and according to the plurality of interference coefficients

Page 24 595144 V. Description of the invention (17) ^-Calculate a system power allocation parameter, which is the sum of the interference coefficients of each of the communication units 丨 丨 mobile communication station 16; ~ Step 2 0 4:-Control The center 1 2 first calculates the total power of the wireless communication system 1 according to the corresponding interference coefficients of each of the base stations i 4 in each of the base stations i 4, and then outputs the total power of the wireless communication system 1 and each of the four 4 The system power allocation parameter is used to set the base station's 4 system power that can be used for the signal; 1 Step 2 0 6: The base station 1 4 allocates a mobile communication station based on its system power and the interference coefficient of each mobile communication module 16 1 6 The power used to output the signal. Step 2 0 8: The mobile communication station 16 outputs a signal to the base station 14 according to the power allocated by the base station 14 and executes step 2 0 0. First, the base station 14 will receive the wireless communication signals uploaded by the mobile communication station 16. For example, the base station 14a is used to receive the signals transmitted by the mobile communication stations 16a, 16b, and 16c, respectively. Base station 1 4 b is used to receive signals transmitted by mobile communication stations 16 d, 16 e, 16 f, and base station 1 4 c is used to receive mobile communication stations 16 g, 16 h, respectively. , 1 6 i. As mentioned before, because wireless transmission is non-directional, for each base station 1 4 a, 1 4 b, 1 4 c, it will receive all the signals transmitted by the wireless communication system 10 ( (Output by each mobile communication station 16), for the mobile communication station 16a, the signal / interference ratio transmitted to the base station 14a is

Page 25 595144 V. Description of the invention (18) SIRa

Pa * Ga + Pb * Gb + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg + Ph * Gh + Pi * Gi-Pa * Ga where Pa ~ Pi are mobile communication stations 16a ~ 16i output signals to the power of the corresponding base stations 1 4a, 1 4b, 1 4c, and G a ~ G i are the signals output by the mobile communication stations 16 a ~ 1 6 i via The transmission gain corresponding to the transmission to the base station 1 4 a in different paths, and an interference coefficient Ca 'is also defined, which is based on the sum of the power of each output signal received by the base station 1 4 a in the wireless communication system 10 (Pa * Ga + Pb * GWPC * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg + Ph * Gh + Pi * Gi) and the transmission gain Ga between the mobile station 16a and the base station 1 4a ,that is

Ca = Pa * Ga + Pb * Gb + Pc * Gc + Pd * Gd + Pe * Ge + Pf * Gf + Pg * Gg + Ph * Gh + Pi * Gi

Ga, so in the same way, we can know that the round-off power relationship between each mobile communication station 16 and the corresponding base station 4 is Pχ ~, where x = a ~ i, so if you want to make the Each mobile communication station 16 = corresponding to the same signal / interference ratio so that each mobile communication station 16 has the same call quality (corresponding to the same S 丨 R value), then the mobile communication station 16 rounds

595144 V. Description of the invention (19) The signal power from a signal to a base station 14 is proportional to the interference coefficient between the corresponding mobile communication station 16 and the base station 14, so it can be calculated based on the interference coefficient. The signal power output by the mobile communication station 6 is further adjusted to balance (ba 1 ance) the signal / interference ratio, and even if each mobile communication station # 6 corresponds to the same signal / interference ratio. In this embodiment, 'each base station 14 will detect the sum of the power of all signals received from the wireless communication system 10 and the corresponding transmission gain of the mobile communication station 6 to the base station 14 (step 2 0 0 ), And further calculate its interference coefficient (step 202), for example, the base station 14a calculates the interference coefficients Ca, Cb, Cc of the mobile communication station 16a, 16b, 16c, and the base station 14b calculates the mobile communication station 16d, 16e, 16f interference coefficients Cd, Ce, Cf, and base station 14 c calculate the interference coefficients Cg, Ch, Ci of mobile communication stations i6g, 16h, 16i. Then each base station 14a, 14b, 14c will calculate the beans separately. System power distribution parameters Ha, Hb, He (step 20 2), the system work; ^ distribution parameters are the sum of interference coefficients, that is,

Ha = Ca + Cb + Cc

Hb = Cd + Ce + Cf

Hc = Cg + Ch + Ci, and for the base station 14a, the system power (? &Amp; +? 5 +? (:) of the output signals received by the mobile communication stations 16a, Ub, 16 (:

Page 27 595144 V. Description of the invention (20)

Pa + Pb + Pc = black When the signal / interference ratio is balanced and equal, the system power of base station 1 4 & will also be proportional to the system power distribution parameter, that is,

Pa + Pb + Pc 氺

Ca + Cb + Cc) * Ha Similarly, when the signal / interference ratio is balanced, the system power of each base station 14 is proportional to its system power distribution parameter, so the control center 12 can 14 system power distribution parameters to reset the system power of each base station 14 to receive signals to balance the signal / interference ratio of wireless communication system 10 (step 2 0 4), and finally each base station 14 The interference coefficient of each mobile communication station 16 controls the power level of the output signal of each mobile communication station 16 (step 206). In other words, if it is in the wireless communication system 10, the mobile communication station 16a corresponds to The interference coefficient with the largest value is compared with other mobile communication stations 16b, 16c, 16d, 16e, 16f, 16g, 16h, and 16 in the wireless communication system 10. The power used by the communication station 16 a to output signals must be the largest. However, for each mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i, due to its own hardware circuit limitation, it has a corresponding maximum output power limit, so when power allocation is performed When operating, each mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h,

Page 28 595144 V. Description of the invention (21) The maximum output power limit of 1 6 i, so in this embodiment, the control center 12 first finds out that it can simultaneously satisfy each mobile communication station 1 6 a, 1 6 b, 1 6 c, 16d, 16e, 16f, 16g, 16h, 16i The maximum output power of the signal is limited to the total output power (step 2 0 4) for subsequent power allocation operations. The above operations are explained below. For example, during the first period, the mobile communication stations 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, and 16i of the wireless communication system 10 use power Pa, PM, Pc, PcH, and Pe respectively. PΠ, Pgl, Phi, and Pil transmit signals to the corresponding base stations 14a, 14b, and 14c. In the second period, the base stations 14a, 14b, and 14c respectively correspond to the system power Qa 1 according to the sum of the power of their received signals. , Qb 1, Qc 1, and then each base station 14a, 14b, 14c will calculate the interference coefficients corresponding to each mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i Ca, Cb, Cc, CcH , Ce, Cn, Cg, Ch, and Cil, and further calculate the system power distribution parameters Hal, Hbl, Hcl. If the wireless communication system 10 sets the total output power of the signal to a predetermined value Qt (the calculation principle of the predetermined value Qt (Detailed later), so the control center 12 allocates the system used by each base station Ua, 14b, 14c in the second period according to the system power allocation parameters Hal, Hbl, Hcl of each base station 14a, 14b, 14c. Power Q a 2, Q b 2, Q c 2, ie

Page 29 595144 V. Description of the invention (22)

3) In addition, the signal powers P a 2, P b 2, and P c 2 output from the mobile communication stations 16a, 16b, and 16c to the base station 14a are allocated according to the system power Qa2 of the base station 14a, respectively.

Pa2 _ Οϊΐ + CM + Ccl Cal (4A)

Pb2 = Pc2 =

4B) 40 The signal power Pd2, Pe2, and Pf 2 output by the mobile communication station 16d, 16e, and 16f to the base station 1 4b are allocated according to the system power Qb2 of the base station 14b as follows

Pd2 = Pe2 = Pf 2 =

5A) 5B) 5C) The signal output from mobile communication station 16g, 16h, 16i to base station 1 4c. Power? 82? Dagger 2?丨 2 are allocated according to the system power of base station 14 (3 (^ 2 is allocated as follows P g 2 = cgi + ^ Lai * Cgl (6 A)

Ph2 = c ^ M ^ cr \ * chi (6B)

Pi 2 = (6C)

Page 30 595144 V. Description of the invention (23) Then, the base stations 14a, 14b, 14c recalculate the transmission conditions of the output signals of the mobile communication stations 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i. The interference coefficients of each mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i and the system power distribution parameters Ha, Hb, He of the base stations 14a, 14b, 14c, and The power control in the third period is performed in the same steps as described above. It is known that each mobile communication station 16 includes a maximum output power limit. Therefore, the control center 12 must use an appropriate signal to output the total power (ie, Qt) in order to meet the above maximum output power limit for power allocation. operating. If Qa2 of Expression (1) is substituted into Expressions (4A), (4B), (4C), the signal power Pa2 can be obtained.

Pb2 and Pc2 are as follows:

Pa2 Pb2 Pc2

Hal + Hbl + Hcl Cbl Λ Hal + Hbl + Hcl (7A) (7B)

Hal + Hbl + Hcl ~ (7C) Similarly, if Qb2 of the expression (2) is substituted into the expressions (5A), (5B), (5C), and Qc2 of the expression (3) is substituted into the expression In (6A), (6B), (6C), the signal power 卩 (12,? 62,? {2,? £ 2,? 112,? 12) is as follows:

Pd2

Ha \ + Hbl + Hcl 7D)

Page 31 595144 V. Description of the invention (24) Pe2 = Hal + Hbl + Hc \ (7E) Pf 2 = C / 1% Ha \ + Hb \ + Hc \ (7F) Pg2 = Hal + Hbl + Hc \ (7G ) Ph2 = Chl * Qt Hal + Hbl + Hc \ (7H) Pi2 = 0 (1 * Qt Hal + Hbl + Hcl (71) If each mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h and 16i respectively correspond to the maximum output power limits of Pmaxl, Pmax2, Pmax3, Pmax [Pmax5, Pmax6, Praax7 > P max 8, P max 9, the control center 1 2 specifies each action in order to balance the signal / interference ratio The power required for the communication stations 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, and 16i is Pa2, Pb2, Pc2, Pd2,? 62,?! 2,?, 2, 112,? 12. Greater than its maximum output power limits Pmaxl, Pmax2, Pmax3, Pmax4, Pmax5, Pmax6,

Pmax7, Pmax8, Pmax9. Therefore, through the expressions (7A) to (71) and the corresponding maximum output power limits pmaxi, pmax2,

Pmax3, Pmax4, Pmax5, Pmax6, Pmax7, Pmax8 'Pmax9 can calculate the wireless communication system 1 0. When the signal / interference ratio reaches a balance, each mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, 16g, 1 When 6 h and 16 i reach their maximum output power limits and output signals to the base stations 1 4a, 1 4b, 1 4c, respectively, the reference total power settings that control system 12 may adopt are:

Qtl = Pmaxl * Inverse | ^ (8A)

595144 on page 32 5. Explanation of the invention (25) Qt2 = Pmax2 * Hal + Hbl + Hc] / cb \ v 8B) Qt3 = Pmax3 * Ha \ + Hb \ + Hc \ / Cc \ v 8C) Qt4 = Pmax4 * Ha \ + Hb \ + Hc \ / Cd \ V 8D) Qt5 = Pmax5 * Ha \ + Hb \ + Hc \ / Cel V 8E) Qt6 = Pmax6 * Ha \ + Hb \ + Hc \ yc / \ C 8F) Qt7 Pmax7 * Ha \ + Hb \ + Hc \ y Cgl Q 8G) Qt8 = Pmax8 * Ha \ + Hb \ + Hc \ / Ch \ V 8H) Qt9 = Praax9 * Ha \ + Hb \ + Hc \ / Cil V 81) Finally, the control system 12 selects a minimum value from the calculated Qtl ~ Qt9 as the actual set value of the signal output total power Qt. Therefore, when the mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i subsequently sets the power Pa2, Pb2, Pc2, Pd2 used by its output signal according to the expressions (7A) to (71) For Pe2, Pf2, Pg2, Ph2, Pi2, the above power Pa2, Pb2, Pc2, Pd2, Pe2,

Pf 2, Pg2, Ph2, Pi 2 will meet the corresponding maximum output power limits Pmaxl, Pmax2, Pmax3, Pmax4, Pmax5, Pmax6, Pmax7, Pmax8, Pmax9. Therefore, mobile communication stations 16a, 16b, 16c, 16d, 16e , 16f, 16g, 16h, and 16i can operate correctly to achieve the signal / interference ratio equilibrium state in the wireless communication system 10. In addition, if each mobile communication station 16a, 16b, 16c, 16d, 16e, 16f, iGg, 16h, 1 6i corresponds to the same maximum output power limit pmax, the control center 12 only needs to Find the interference coefficient with the largest

Page 33 595144 V. Explanation of the invention (26) Numerical interference coefficient, and then the actual set value of the total signal output power Qt is calculated according to one of the corresponding expressions (8A) to (81). For example, if the control center 12 compares the corresponding interference coefficients Cal, Cbl, Cel, Cdl, Cel, Cfl, 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i Cgl, Chi, Cil, and find an interference coefficient with the largest value as Cal. Therefore, according to the expression (8 A), it can be known that the total signal output power Q t that the control center 12 needs to set is Pmax * @ 1 ^. As mentioned above, in the wireless communication system 10, compared with other mobile communication stations 16b, 16c, 16d, 16e, 16f, 16g, 16h, 16i, the mobile communication station 16a corresponding to the maximum interference coefficient Cal must be used. The maximum power pa2 (in accordance with the maximum output power limit Pmax) is used to output signals to the corresponding base station 14a to achieve the signal / interference ratio balance, that is, other mobile communication stations 16b, 16c, 16d, 16e, 16f, 16g, 16h The power Pb2, Pc2, Pd2, Pe2, Pf2, Pg2, Ph2, Pi2 used by the 16i and 16i must be smaller than the power Pa2, so each power Pb2, PC2, Pd2, Pe2, Pf2, Pg2, Ph2, Pi2 must also be Will meet the maximum output power limit pmax. Please note that the above-mentioned method of setting the total output signal power Qt can be set according to the proportional relationship between the interference coefficients to set the corresponding output power to balance the signal / interference ratio of the wireless communication system, which all fall within the scope of the present invention. In this embodiment, the control center 12 allocates the base stations according to the system power allocation parameters of the base stations 14 and 4 can be used to set the corresponding rows.

595144 V. Description of the invention (27) The system power of the output power of the mobile communication station 16 and then each base station 4 sets the corresponding mobile communication station according to the proportional relationship of the interference coefficient of the corresponding mobile communication station 16 16 The power used for the output signal. In other words, the two methods of controlling the signal transmission power of the present invention are based on the ratio of the interference coefficients of all mobile communication stations 16 in the wireless communication system 10 to set each action. The calculation of the interference coefficient of the power used by the communication station 16 to output the signal to the base station i 4 is performed by the base station 14. As described above, the present invention is based on the interference coefficient corresponding to the signal transmission between the base station 14 and the mobile communication station i 6 to allocate the power of the base station 14 output signal (download transmission mode) or the mobile communication station 16 output signal. Power (upload transmission mode), such as transmitting interference coefficients Cal, Cbl, Cc: 1, Cdl, Cel, Cfl, Cgl, Ch and Cil to the control center 12, however, in order to reduce the base station 14 and the control center 12 2 The amount of data transmitted between the base stations 14 will first add an interference coefficient to obtain the system power allocation parameters, and then transmit the system power allocation parameters H a 丄, HM, He 1 to the control center 12, Therefore, the control center material processing load is reduced. In addition, in this embodiment, the interference coefficient corresponding to the signal transmission between the base station 14 and the mobile communication station 6 detected in the first period (first power control) is used to allocate the second period (second power Control) base g 1 4 output signal power (download transmission mode) or mobile communication $ i & output signal power (upload transmission mode), for example, for base =

Page 35 595144 V. Description of the invention (28) For the station 1 4 a downloading the signal to the mobile communication station 16 a, when the wireless communication system i 〇 performs the first power control, the base station 丨 4 a A power Pal outputs a first signal to the mobile communication station. At this time, the base station Ua and the mobile communication station 16 a correspond to a transmission gain G a 丨, so the mobile communication station 16 a receives the interference coefficient of the first signal. For Ca 丨, when the wireless communication system 10 performs secondary power control, the base station 4a adjusts the base station 1 4a based on the interference coefficient Ca 丨 detected by the mobile communication station 16 for the first power control. The second period outputs a second signal to the power Pa2 of the mobile communication station 16 & However, the signal transmission environment between the base station 14 and the mobile communication station 16 may change during the second period, for example, the mobile communication station 丄 6 It will affect the transmission gain between the base station 丨 4 and the mobile communication station i 6 as the user moves, that is, the interference coefficient of the transmission signal between the base station 丨 4 and the mobile communication station 16 may be further affected, so the first During the second and second periods, the base The interference coefficients of the transmission signals between 1 4 and the mobile communication station 16 correspond to different values. Therefore, the base station 14 applies the first interval ^ in the second period to control the output power and cannot make the wireless communication system 1 The signal transmission in 0 has the same signal / interference ratio, so the present disclosure also discloses a linear prediction method to & present the above problem ', and its operation principle is described in detail below. Generally speaking, the time TP required for the wireless system to perform power control once is very short, while the base station; the signal transmission environment between the base station 14 and the mobile station 16 changes little during this time Tρ, however If the mobile communication station 16 is gradually away from the base station 丨 4, so as the distance between the base station 14 and the mobile communication station 16 increases, the transmission gain between the base station 14 and the mobile communication station 16 also increases. Will gradually decrease

Page 36 595144 V. Description of the invention (29): 'Each household = correspondence will also increase with the transmission gain. Since the time Tp required to perform one-time power control is short, the variation of the second interference coefficient can be regarded as the first line in a short time. The ^ 1 embodiment uses the interference detected by two consecutive power controls ^ ^ to measure the next-time power control material, the interference coefficient (Γ, which is Τ cn +1) C (n)-C (-1) + C (n) When the wireless communication system 10 performs the n-th power control, the interference coefficient C (u and the η —丨 The interference coefficient C (η) detected during the time period is linearly predicted by the extrapolation method, and the interference coefficient C ′ (η + 1) of the first stage is predicted linearly, and the base station 14 uses the predicted interference coefficient c- (η + 1) Calculate the system power allocation parameters. When the wireless communication system performs the n + 1th power control, the control center 12 will allocate the total power of each base station 14 to output or receive signals according to the system power allocation parameters. , The same 'based on the interference coefficient c (n + 1) detected in the n + 1 period and the n The interference coefficient C (η) is used to linearly predict the interference coefficient (Γ (η + 2)) at the η + 2 period. As described above, this embodiment predicts the next power control based on the detected interference coefficient. The base station Possible interference coefficients between 1 4 and mobile communication station 16. Therefore, the next power control operation is based on predicted interference coefficients, which can increase the accuracy of power control and improve the overall communication quality of wireless communication system 10.

Page 37 595144 V. Description of the invention (30) In addition, since the wireless communication system uses code division multiple access technology to transmit signals, for download transmission mode or upload transmission mode, the base station 14 and the mobile communication station 1 The wireless communication signals between 6 are transmitted through the same frequency band. In addition, the control commands and related parameters between the base station 14 and the mobile communication station 6 are also transmitted through the same frequency band. For example, in the download transmission mode, the mobile Interference coefficient from communication station 16 to base station 丨 4, and in the upload transmission mode, base station i 4 outputs control command to mobile station 16 to set the power of mobile station i 6 output signal, if the same There are many mobile communication stations i 6 in the communication unit 11, and the amount of control instructions and related parameters transmitted between the base station 14 and the mobile communication station 1 6 will be very large and occupy the transmission bandwidth, so The present invention can also make use of the conventional differential pulse code modulation.

modulation, DP CM) to transmit control instructions and related parameters to reduce the occupied transmission bandwidth. For example, for the upload transmission mode, if m [k-1] is transmitted from base station 1 4 to mobile communication station i 6 The k_ 丨 th control instruction, and m [k] is the first control instruction, then the differential pulse code modulation system is the difference d [k] between the m [k-1] and m [k] transmitted by the base station 14. ] (d [k]

= m [k] -m [kl]), for the mobile communication station 16, when it receives the rate d [k], it can be based on the known m [k— 丨] To find the m [k] (m [k] = m [kl] + d [k]), so as long as the difference d [k] is received, the mobile communication station 16 can recover the control command m [k] , Because the difference d [k] has a lower amplitude (peak ampl 1 tude) than the control instruction ra [k], so the difference d [k] can be represented by fewer bits (bi t) , So because the bandwidth required for the transmission difference d [k] is less,

Page 38 Open, close, and differential adjustment At this time, the same as the ground and the number of samples, the same, the system, the control mode, the input of the input and output of the control mode, the transmission of the variable, the downward adjustment of _ in the code. 1 The use of editing and conversion should be consistent with the pulse and the letter is clear. 1) Variations (3 line tuning and p p codeless measurement are low editing and t reduction, five-step pulse number 595144

For the download transmission mode, when the transmission gain between a base station 14 and a mobile communication station 6 is extremely low, for example, the transmission path between the base station ⑷ and the mobile communication station ^ 6a is far or blocked by a building. The signal is greatly reduced. Therefore, compared to other mobile communication stations i 6, the interference coefficient calculated by mobile communication station 6a will be larger, so the transmission between base station 4a and mobile communication station 16a is not good. Therefore, when the next power control is performed, the base station 14a will use larger power to transmit signals to the mobile communication station 16a to improve the problem of poor transmission. However, the power available to other mobile communication stations 16 is relatively small. The signal / interference ratio corresponding to the wireless communication system 10 is also reduced at the same time. Therefore, in order to save the transmission between the base station 14a and the mobile communication station 16a, the overall communication quality must be sacrificed ( Signal / interference ratio is reduced). In order to improve the overall call quality, when the transmission gain between a base station 14 and a mobile communication station 丨 6 is extremely low, the interference coefficient obtained by the mobile communication station 16 is greater than a threshold value. When the overall signal / interference ratio of the electronic system 10 is less than a second critical value, the interference coefficient of the mobile communication platform 16 is reset by a predetermined value. This embodiment resets the interference coefficient of the mobile communication station 16 by using the interference coefficient calculated by the wireless communication system 10 ′ to be smaller than the maximum value of the first critical value. Therefore, this embodiment sets this

Page 39

595144 V. Description of the invention (32) Base station 14 maintains the AND line with one power, although the power is not enough; the problem of poor transmission between the stations Π and 16 is the base, port 1 4 and the mobile communication station 1 4 and the mobile communication station 丨 6 ^ w This embodiment sacrifices the overall signal / interference ratio of the base station system 10 to maintain the wireless communication system other mobile communication stations 16 has better than the second / threshold value, but still makes the call quality of the wireless communication system 10 ^ 5 tongue = shell, so it will not be used. Similarly, for uploading! IP, a bad connection and a bad action communication station 16 with a work ΓίΪϋ, f embodiment also sets the J, although the power is not ii ;: ground; Ϊ ί: ΐ? 4 problems, that is, This embodiment sacrifice the 味 π / 味 tiger transmission of the mobile communication wire to maintain the normal afL number / interference ratio of the wireless communication system f 10 is greater than the second critical value, and the call quality of the communication system 10 is available. Because of a poorly-connected connection, "... ΐ: two deaths" can be applied to a linear prediction transmission mode-g 2% 2-the predicted interference coefficient calculated by k stations 16 is greater than 'day guard, with a predetermined Values, such as resetting the predicted interference coefficient of the mobile communication station 16 by using the predicted interference coefficient less than the maximum value of the first critical value, all belong to the scope of the present invention. Compared with the conventional technology, the signal transmission power control of the present invention The method is to control the signal transmission power according to the interference coefficient between the base station 14 and the mobile communication station 16 so that the signal transmission wheels in the wireless communication system 10 have the same signal / interference ratio, that is, the wireless communication system i 0, base

Page 40

595144 V. Description of the invention (33) The sum of the calculated signal power due to the interference coefficient and the prediction between the station 14 and the mobile communication station 16; the invention implements the signal transmission power control (implementation), and also uses a linear prediction Method to increase the accuracy of power control. The control command and the relational expressions are transmitted to reduce the connection quality between the data communication stations 16. The quality control method is to sacrifice the connection product as power to maintain the connection. The signal transmission of the connection device is very easy. The transmission path method is easy to implement the information of the present invention. In addition, the number of bases is based on the difference. Furthermore, when the quality is not good, the quality can still be maintained. You only need to detect the transmission increase number and the transmission power to correct the interference station 14 and the line pulse. When the base station ’s signal transmission is other Based on the quality of the received call with the same call quality, the rate control method coefficient is increased, and the transmission power of the communication station 16 and the mobile station with the 16 code modulation is increased.

Page 41 595144 Brief description of the diagrams Brief description of the diagrams: Figures 1 and 2 are schematic diagrams of the conventional spread spectrum technology. FIG. 3 is a schematic diagram of a conventional wireless communication system. FIG. 4 is a flowchart of a first signal transmission power control method according to the present invention. FIG. 5 is a flowchart of a second signal transmission power control method according to the present invention. Symbol description of the icon:

10 Wireless communication system 11 Communication unit 12 Control center 13 Communication area 14 Base station 16 Mobile communication station

Page 42

Claims (1)

595144 6. Scope of patent application 1. A power control method for signal transmission of a code division multiple access (CDMA) wireless communication system. The wireless communication system includes a control center and a plurality of control centers. Communication unit (ce 1 1). Each communication unit includes a base station and a plurality of mobile communication stations. The signal transmission power control method includes at least & the following steps. Corresponding base stations corresponding to the early Yuan, respectively, wireless communication signals with a corresponding power, to the plurality of communications = multiple mobile communication stations within the yuan; ° > each communication unit The mobile communication station calculates its interference index (interference index); and the control center sets the base station corresponding to the plurality of communication units corresponding to each mobile communication station according to the ratio of the interference coefficients of each mobile communication station The power of wireless communication signals. , To 2 · According to the signal transmission power control method described in item 1 of the scope of patent application, it also includes the following steps: · The base station of each communication unit calculates the power allocation parameters of a different system, and sends ^ as the plural number of the communication unit. The sum of the interference coefficients of each mobile communication station is 3. The signal transmission power control method described in item 2 of the scope of patent application, including the following steps: The base station of each communication unit transmits its system power allocation parameters 595144 6. The control center of Shen Qing's patent scope; and the control center sets the wireless communication signal output of the two base stations Σ Ξ rate based on the system power distribution of each base station 关系 = the system power is the base The wireless communication signal output from the station 4 · The signal transmission power control method as described in item 3 of the scope of patent application 'includes the following steps: The base station of the second unit according to the communication unit's mobile communication station = the ratio of the interference coefficient The system power of the base station is allocated to determine the wireless communication signal power output to each mobile communication station. Sigh 5. The signal transmission power control method described in item 1 of the scope of the patent application, wherein the interference coefficient is transmitted by a differential pulse code modulation (DPCM) method. 86. The signal transmission power control method as described in item 1 of the scope of patent application, further including the following steps: When the interference coefficient corresponding to a mobile communication station is greater than a predetermined threshold, reset the interference The coefficient is a predetermined value. 7. The signal transmission power control method as described in item 6 of the patent application scope, wherein the predetermined value is a mobile communication station in the wireless communication system Page 44 595144 VI. Patent application range _ The interference coefficient is less than the maximum value of the predetermined threshold. 8 · The signal transmission power control method as described in item 1 of the scope of patent application, including the following steps: I According to the interference coefficient of each mobile communication station receiving the corresponding base station transmission signal in a first period and a second period To perform an extrapolation method to calculate the interference coefficient of each mobile communication station. & only 9 · According to the signal transmission power control method described in item 8 of the scope of patent application, the method further includes the following steps: The control center sets each base station to transmit to the third period according to the proportional relationship of the predicted interference coefficient of each mobile communication station. Corresponding to the power of the wireless communication signal of the mobile communication station. 10. A power control method for signal transmission applied to a code division multiple access (CDMA) wireless communication system. The wireless communication system includes a control center and a plurality of communication units (ce 1 1 ), Each communication unit includes a base station and a plurality of mobile stations, and the signal transmission power control method includes at least the following steps: Each of the plurality of mobile communication stations transmits a corresponding signal. Work Page 45 595144 'Please request the scope of the patent, the wireless communication signal to the base of the corresponding communication unita · The base station of each communication unit calculates the corresponding interference coefficient of each line ^ =; and The proportional relationship between the total output power of the signal and the interference coefficient of each mobile station and the second station. Set ^ = the power of the wireless communication signal transmitted by the communication station to the corresponding base station. 1 1 · The signal transmission power control method as described in item 10 of the scope of the patent application, further comprising the following steps: I Calculate the system of the base station of the communication unit according to the interference coefficients of the plurality of mobile communication stations of each communication unit The power allocation parameter is the sum of the interference coefficients of each mobile communication station of the communication unit. Λ 1 2 The signal transmission power control method described in item 11 of the scope of patent application, further comprising the following steps: transmitting the system power distribution parameters of the base station of each communication unit to the control center; and the control center according to each The proportional relationship of the system power distribution parameters of a base station sets the system power that each base station can use to receive wireless communication signals. The system power is the sum of the powers of all the base stations receiving all wireless communication signals. 1 3 · As described in Item 12 of the scope of patent application, the transmission power control method of the machine 5 tiger further includes the following steps: 595144 VI. The base station of each communication unit in the scope of patent application, according to the proportional relationship of the interference coefficient of the mobile communication station of the communication unit, allocate the system power of the base station to set each mobile communication station to output wireless communication signals to the base Power required by the station. 14 · The signal transmission power control method as described in item 13 of the scope of patent application, wherein the base station of the communication unit outputs a control command to the mobile communication station of the communication unit to set the mobile communication The station outputs the power of the wireless communication signal to the base station. 15 · The signal transmission power control method as described in item 14 of the scope of patent application, wherein the control command is transmitted by a differential pulse code modulation (DPCM) method. 16 · According to the signal transmission power control method described in the scope of the patent application, the method further includes the following steps: When the interference coefficient corresponding to a mobile communication station is greater than a predetermined threshold, reset the interference coefficient to a Predetermined value. 17 • The signal transmission power control method as described in item 6 of the patent application range, wherein the predetermined value is the maximum value of the interference coefficient of each mobile communication station that is less than the predetermined critical value. 595144 6. Scope of patent application 1 8 · The signal transmission power control method described in item 10 of the scope of patent application, including the following steps: ^ According to each mobile communication station output wireless in a first / period and a second period The perturbation coefficient of the communication signal to the corresponding base station is subjected to an extrapolation method to calculate the predicted interference coefficient of each mobile station. 1 9 · The signal transmission power control method described in item 18 of the scope of patent application, further comprising the following steps: · The control center sets the third time period according to the proportional relationship of the predicted interference coefficient of each mobile communication station. The power of a wireless communication signal transmitted by a mobile communication station to the corresponding base station is 020. · If the method of patent application No. 10 method, wherein the plurality of mobile communication restrictions, the signal transmission power control the control center based on the wireless The communication interference coefficient and the maximum output power are limited so that the power of the mobile communication line communication signal of each communication unit is not greater than the system. 2 1 · If the 20th method of the scope of patent application, the method further includes the following steps: The above-mentioned transmission power control station corresponds to a maximum output power method. The method further includes the following steps: Each mobile communication station in the system, ° In addition, the total output power of the signal is transmitted by the station to the signal transmission power control unit of the corresponding base station without the corresponding large output power limit. Page 48 595144 VI. Scope of patent application The control center uses the maximum output power limit and interference ratio of each mobile communication station in the wireless communication system to calculate a plurality of reference total powers; and compares the plurality of reference total powers; and Power, and use the reference total power with the smallest value to set its signal output total power. 2 2 · The signal transmission power control method as described in item 20 of the scope of patent application, wherein the plurality of mobile communication stations correspond to a same maximum output power limit, and the signal transmission power control method further includes the following steps: the control The center compares the interference coefficient of each mobile communication station in the wireless communication system to obtain a first interference coefficient with the smallest value; and uses the maximum output power limit and the first interference coefficient to communicate with each mobile communication system in the wireless communication system. The ratio of the interference coefficients of the stations calculates a reference total power, and uses the reference total power to set its signal output total power. Page 49