KR100532280B1 - Apparatus and method for controlling data rate of reverse channel in mobile communication system - Google Patents

Abstract

The present invention relates to a method and apparatus for determining and transmitting a transmission rate of a reverse channel quality indication channel (R-CQICH) for transmitting forward channel state information in a mobile communication system supporting a packet data service and a voice service. The base station determines the transmission rate of the reverse channel quality indication channel based on the amount of power available for packet service, the number of Walsh codes, the interference amount of the reverse channel quality indication channel, the type of packet data service, and the number of terminals in the packet data service. Send to the terminal. The terminal receives the indication information on the transmission rate of the reverse channel quality indication channel from the base station and updates the forward channel state information at a predetermined period and transmits it to the base station through the reverse channel quality indication channel. The present invention can adjust the amount of interference of the reverse link according to the packet data service situation of the base station.

Description

Apparatus and method for controlling the rate of reverse channel in mobile communication system {APPARATUS AND METHOD FOR CONTROLLING DATA RATE OF REVERSE CHANNEL IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a mobile communication system, and more particularly, to an apparatus and method for controlling a transmission rate of a reverse channel (R-CQICH) for transmitting forward channel status information.

With the rapid development of mobile communication system technology, mobile communication service is developing not only voice service but also data service for video communication and internet. For efficient service, the mobile communication system separates a circuit channel for voice service and a packet data channel for data service.

In particular, in systems that support both the circuit channel and the packet data channel, such as 1xEV-DV (Evolution in Data and Voice), the packet data service can be enhanced by maximizing the data transmission capability of the base station by utilizing the resources of the base station for packet data service. To increase the data throughput for the requesting terminals. To this end, in the scheduling of packet data transmission to the terminals, the base station determines and transmits the data rate according to the channel conditions of the terminals. In a system for packet data service, the base station forwards to the terminals to determine the forward data rate. Requires channel state information, for example signal strength measurements of the forward channel. This is to effectively perform the forward data transmission even if some interference occurs in the reverse data transmission due to the backward transmission of the forward channel state information. The forward channel state information is transmitted through a reverse channel quality indicator channel (R-CQICH). The transmission rate of the R-CQICH is considered to be 800 Hz (= 1 / 1.25 ms).

However, in a system that supports circuit (voice) users and packet (data) users at the same time, the base station preferentially allocates base station resources, that is, base station power and Walsh codes, for the circuit users and the remaining resources for data users. In this case, as the number of voice users increases or decreases, base station resources allocated for packet data users also change. However, regardless of the amount of base station resources allocated to data users, transmitting the reverse R-CQICH at a constant rate is very inefficient for resource utilization of the reverse link. Therefore, there is a need for a technique for varying the transmission rate of the reverse R-CQICH.

Accordingly, an object of the present invention is to provide an apparatus and method for controlling a transmission rate of a reverse channel (R-CQICH) for transmitting forward channel status information in a mobile communication system.

A method according to an embodiment of the present invention for achieving the above object is, in a mobile communication system supporting both a packet data service and a voice service, the reverse channel quality indication channel (R- A method for controlling a transmission rate of a CQICH, the method comprising: based on a sum of power available for a packet data service and interference amounts measured for reverse channel quality indication channels from all terminals serving packet data by the base station; Determining transmission rates of the reverse channel quality indication channels, and transmitting indication information on the determined transmission rates of the reverse channel quality indication channels to all the terminals. According to the method, a packet data service and a voice service are supported together. A method for controlling a transmission rate of a reverse channel quality indication channel (R-CQICH) in which a base station carries forward channel state information in a new system, the method comprising: an amount of power available for a packet data service, a number of Walsh codes, and the reverse channel Determining a transmission rate of the uplink channel quality indication channel in consideration of some or all of the amount of interference measured for the quality indication channel, the type of packet data service, and the number of terminals in the packet data service by the base station; And transmitting the indication information on the transmission rate of the channel quality indication channel to the corresponding terminal. The method according to another embodiment of the present invention provides a mobile communication system supporting both a packet data service and a voice service. In this case, the reverse channel quality indication that the terminal carries forward channel state information A method for controlling a transmission rate of (R-CQICH), the method comprising: receiving indication information on a transmission rate of the reverse channel quality indication channel from a base station, and transmitting the reverse channel quality indication channel according to the received indication information And setting a period, and updating the forward channel state information according to the set transmission period, and transmitting the reverse channel quality indication channel through the reverse channel quality indication channel. In the base station apparatus for controlling the transmission rate of the reverse channel quality indication channel (R-CQICH) for transmitting the forward channel state information in a mobile communication system supporting both packet data service and voice service, used for packet data service The amount of power available and the number of Walsh codes, the amount of interference measured for the reverse channel quality indication channel, A rate determiner for determining a transmission rate of the reverse channel quality indication channel in consideration of a type of a kit data service and a part or all of the number of terminals serving packet data by the base station; and a rate of the determined reverse channel quality indication channel. And a transmitter for transmitting the indication information to a corresponding terminal. In accordance with another embodiment of the present invention, a device for transmitting forward channel state information in a mobile communication system supporting a packet data service and a voice service together is provided. In the apparatus of the terminal for controlling the transmission rate of the reverse channel quality indication channel (R-CQICH), the transmission period of the forward channel state information based on the indication information about the transmission rate of the reverse channel quality indication channel from the base station A rate controller for determining and the forward occurrence generated for each transmission period An encoder for encoding coded channel state information and outputting code symbols, a Walsh cover for outputting a Walsh cover code indicating an optimal sector having the best forward channel quality, a multiplier for multiplying the code symbols and the Walsh cover, and A sequence repeater for repeatedly outputting the output sequence from the multiplier by a repetition number determined according to the transmission period, a Walsh spreader for Walsh-spreading the output from the sequence repeater with a predetermined Walsh code, and from the Walsh spreader. And a gain adjuster for outputting the output sequence by multiplying the channel gain determined according to the transmission period.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention will be described a technique for controlling the transmission rate of the R-CQICH transmitting the forward channel state. Here, the considerations for controlling the transmission rate of the R-CQICH include: base station resources (power amount and number of Walsh codes) available for packet data service, interference amount of the reverse channel R-CQICH measured by the base station, packet data of the terminal Service type and total number of terminals.

On the other hand, the rate indication information of the R-CQICH determined in consideration of the various factors as described above is transmitted to the terminal, the terminal based on the rate indication information received from the base station through the R-CQICH forward channel state information Reset the transmission cycle.

1 illustrates signals exchanged between a terminal and a base station to control a transmission rate of an R-CQICH for transmitting forward channel state information in a mobile communication system according to an exemplary embodiment of the present invention.

As shown, the UE transmits the R-CQICH at the transmission rate of the R-CQICH currently set in step 100. Here, the R-CQICH carries forward channel state information as described above. In step 102, the base station considers the base station resources (power and Walsh codes) available for packet data service, the amount of interference of the reverse channel measured by the base station, the type of packet data service of the terminal, and the total number of terminals. The transmission rate is determined, and the transmission rate of the determined R-CQICH is transmitted to the terminal. After receiving the transmission rate of the R-CQICH, the UE changes the transmission period of the R-CQICH with the R-CQICH transmission rate received from the base station in step 104, and according to the changed transmission period, forward channel state through the R-CQICH. Send the information.

2 illustrates an apparatus of a base station for determining a reverse R-CQICH transmission rate according to an embodiment of the present invention.

As shown, factors to be considered in determining the transmission rate of the R-CQICH in which the base station transmits the forward channel status information include power amount information 200 allocated to the packet data service by the base station and a Walsh code assigned to the packet data service. The number 202, the interference amount measurement 204 of the R-CQICH, the packet data service type information 206 of the terminal, and the number 208 of the total terminals in packet data service by the base station.

2, the information about the amount of power allocated to the packet data service 200 is most closely related to the packet data rate supported by the base station. If the packet data rate is high and the amount of allocated power is small, the packet data rate is low. Herein, the amount of power 200 allocated to the packet data service is the amount of power excluding the amount of power allocated to the circuit user among the total amount of power of the base station. The information 202 on the number of Walsh codes allocated to the packet data service is the total number of Walsh codes supported by the base station minus the number of Walsh codes supported for the circuit user. Similarly, a large number of Walsh codes results in a high packet data rate, and a low number of low Walsh codes. Here, if the packet data rate is high, the rate of the R-CQICH should also be increased. Information 204 on the amount of interference measured by the UE with respect to the R-CQICH is received from the UEs in the packet data service with respect to the base station thermal noise. It is a measurement of interference amount of R-CQICH. The greater the amount of interference of the R-CQICH, the lower the transmission rate of the R-CQICH. The information 206 on the packet data service type of the terminal is related to whether the packet data service is a service such as ftp (file transfer protocol) irrelevant to time delay or near real-time service related to time delay. The information 208 on the total number of UEs in the packet data service is used as a measure of the degree of interference by the R-CQICH because the larger the number, the smaller the amount of interference on the reverse link and the less the amount of interference. That is, if the total number of terminals is large, the transmission rate of the R-CQICH should be lowered. The rate determiner 210 determines the transmission rate of the R-CQICH using the above information 200 to 208. The rate determiner 210 utilizes part or all of the power amount information 200, the Walsh code number information 202, the interference amount information 204 of the CQICH, the data service type 206, and the total number of terminal information 208. When determining the transmission rate of -CQICH, the transmitter 212 notifies the terminal of the transmission rate of the determined R-CQICH. The determined transmission rate of the R-CQICH may be applied to one terminal in a packet data service in the base station or to some terminals belonging to a specific group or simultaneously to all terminals.

Hereinafter, as an embodiment of the present invention, the rate determiner 210 determines the rate of R-CQICH by using the power amount information 200 allocated to the packet data service and the interference amount measurement value 204 of the R-CQICH. The operation to perform will be described. In this embodiment, a case of determining a transmission rate of R-CQICH for all user terminals in data service will be described. In addition, in addition to the embodiments described below, other embodiments using the information elements shown in FIG. 2 may also determine the transmission rate of the R-CQICH.

The following program code shows an operation of determining the R-CQICH data rate according to the above example. Pm represents power amount information 200 allocated to the packet data service, Pt represents the total amount of power of the base station, Tm represents the interference amount 204 measured for the R-CQICH, and Ttn represents the thermal noise power of the base station.

delete

if (Pm / Pt> = P1 (50%)) then, R-CQICH baud rate = 800 Hz

else if (Pm / Pt> = P2 (30%)) {

if (Tm> = T1 (1dB)) then, R-CQICH baud rate = 400Hz

else R-CQICH Baud Rate = 800 Hz

}

else if (Pm / Pt> = P3 (10%)) {

if (Tm / Ttn> = T1 (1dB)) then, R-CQICH baud rate = 200Hz

else if (Tm / Ttn> = T2 (0.5dB)) then, R-CQICH baud rate = 400Hz

else R-CQICH Baud Rate = 800 Hz

}

else {

if (Tm / Ttn> = T1 (1dB)) then, R-CQICH baud rate = 100 Hz

else if (Tm / Ttn> = T2 (0.5dB)) then, R-CQICH baud rate = 200Hz

else if (Tm / Ttn> = T3 (0.25dB)) then, R-CQICH baud rate = 400Hz

else R-CQICH Baud Rate = 800 Hz

}

 3 is a flowchart illustrating an operation of determining the R-CQICH transmission rate according to the above-described embodiment of the present invention. As shown in FIG. 3, the power amount 200 of the base station and the interference amount 204 of the reverse channel R-CQICH are shown. The procedure for determining the R-CQICH transmission rate by using is shown.

Referring to FIG. 3, the base station determines the power amount Pm of the base station allocated for the packet data service in step 300, and measures the interference amount Tm of the reverse channel R-CQICH in step 302. Then, the base station according to the ratio Pm / Pt of the strategic amount Pm for the packet data service to the total power Pt of the base station and the ratio Tm / Ttn of the interference amount Tm of the R-CQICH with respect to the thermal noise Ttn of the base station The transmission rate of the R-CQICH is determined as one of predetermined 800 Hz, 400 Hz, 200 Hz, and 100 Hz.

In other words, if the ratio Pm / Pt of the amount of power is greater than or equal to P1 (50%) in step 304, the base station proceeds to step 328 to determine the transmission rate of the R-CQICH at 800 Hz. Decide on If Pm / Pt is less than P1 (50%), the process proceeds to step 306 and compares with the next reference value P2 (30%). If the comparison result is greater than or equal to P2 (30%), the base station proceeds to step 308 and compares the ratio Tm / Ttn of the measured interference amount Tm to the thermal noise Ttn with a predetermined reference value T1 (1 dB). If the ratio Tm / Ttn of the interference amount is greater than or equal to the T1 (1 dB), the base station proceeds to step 330 to determine the transmission rate of the R-CQICH to 400 Hz, otherwise proceeds to step 328 to the R Determine the transmission rate of the CQICH to 800 Hz.

If the ratio Pm / Pt of the amount of power is less than P2 (30%) in step 306, the base station proceeds to step 310 and compares the Pm / Pt with a next reference value P3 (10%). If the comparison result is greater than or equal to P3 (10%), the base station proceeds to step 312 and compares the ratio Tm / Ttn of the interference amount with a predetermined reference value T1 (1 dB). If the Tm / Ttn is greater than or equal to the T1 (1 dB), the base station proceeds to step 332 to determine the transmission rate of the R-CQICH to 200 Hz, otherwise proceeds to step 314 to go to the next Tm / Ttn. Compare with reference value T2 (0.5dB). If the comparison result is greater than or equal to T2 (0.5 dB), the base station proceeds to step 330 to determine the transmission rate of the R-CQICH to 400 Hz, otherwise proceeds to step 328 to determine the transmission rate of the R-CQICH. Determine at 800Hz.

On the other hand, if the ratio Pm / Pt of the amount of power in step 310 is less than the P3 (10%), the base station proceeds to step 316 and compares the Tm / Ttn with the T1 (1dB). If the comparison result is greater than or equal to the T1 (1dB), the base station proceeds to step 334 to determine the transmission rate of the R-CQICH to 100Hz, otherwise proceeds to step 318 to T2 / Ttn T2 (0.5dB) Compare with If the comparison result is greater than or equal to the T2 (0.5 dB), the base station proceeds to step 332 to determine the transmission rate of the R-CQICH to 200 Hz, otherwise proceeds to step 320 to the Tm / Ttn and T3 (0.25 dB). Compare with If the comparison result is greater than or equal to T3 (0.25 dB), the process proceeds to step 330 to determine the transmission rate of the R-CQICH to 400 Hz, otherwise proceeds to step 328 to determine the transmission rate of the R-CQICH to 800 Hz.

In the above embodiment, the transmission rate of the R-CQICH is determined to be one of 800 Hz, 400 Hz, 200 Hz, and 100 Hz which are predetermined.

Meanwhile, the base station may directly transmit the information indicating the transmission rate determined as described above to all the terminals in the packet data service by the base station, or may transmit information indicating a relative increase or decrease with respect to a predetermined R-CQICH transmission rate. . In the case of four R-CQICH data rates, 800Hz, 400Hz, 200Hz, and 100Hz, the rate indication information can be represented by 2 bits. However, if only the increase or decrease is indicated, the rate indication information can be represented by only 1 bit.

In order to transmit the rate indication information of the R-CQICH to all terminals, a broadcasting channel is required. To this end, the present invention intends to use the 'packet data control channel' proposed in the 1xEV-DV system. The role of the packet data control channel is to transmit various information about the packet data channel, an encoding rate, a modulation scheme, and the like. Along with the data channel, the packet is transmitted to terminals in data service. The packet data control channel also broadcasts Walsh Space Indicator, which represents the number of Walsh codes used for the packet data channel at regular intervals or whenever necessary. Therefore, in the present invention, as a preferred embodiment, when the packet data control channel broadcasts the Walsh space information, the packet data control channel carries R-CQICH rate indication information together. Table 1 below shows a message of a packet data control channel used in the present invention.

Field Length (bits) Value WALSH_SPACE_INDICATION_ID 6 000000 WALSH_SPACE 5 XXXXX R-CQICH_DATA_RATE 2 ## Total 13 000000XXXXX ##

<Table 1> shows a message format when a message of a packet data control channel transmitting 13 bits of information is broadcasting Walsh space information, and an R-CQICH_DATA_RATE field for expressing rate indication information of an R-CQICH. If the value of the WALSH_SPACE_INDICATION_ID field is 000000, the 5-bit WALSH_SPACE field is set to a value representing Walsh space, and the R-CQICH_DATA_RATE field indicates 2 bits of the R-CQICH transmission rate. For example, the value of the R-CQICH_DATA_RATE field may be represented as 800 Hz, 00, 400 Hz, 01, 200 Hz, and 11, 100 Hz. In other cases, when the increase / decrease of the R-CQICH transmission rate is expressed, it may indicate an increase of 00, a decrease of 11, and a maintenance of a current state of 01 without changing the size of the R-CQICH_DATA_RATE field.

As described above, when the base station determines the R-CQICH transmission rate and transmits it, the terminal receives the indication information on the R-CQICH transmission rate and controls the transmission rate of the R-CQICH.

4 illustrates a procedure for controlling reverse rate R-CQICH by receiving reverse channel R-CQICH rate indication information in a terminal according to an embodiment of the present invention.

Referring to FIG. 4, the terminal determines whether R-CQICH rate indication information is received from the base station in step 400. The rate indication information is transmitted in a message of a packet data control channel as shown in Table 1 as described above. That is, the terminal receives the message broadcast through the packet data control channel, analyzes the message, and obtains R-CQICH rate indication information of the R-CQICH_DATA_RATE field in the message. If the rate indication information cannot be obtained, the process proceeds to step 404 to maintain the preset R-CQICH rate. On the other hand, if the rate indication information is acquired, the terminal determines the rate information based on the obtained R-CQICH rate indication information in step 402. The transmission period of the R-CQICH is determined. In step 404, the UE transmits forward state information through the R-CQICH according to the determined R-CQICH transmission period. At this time, if the transmission rate of the R-CQICH is changed, the expression form of the forward channel state information should be applied differently according to the type of the forward channel state information transmitted through the R-CQICH. If the forward channel state information represents the forward channel signal strength itself measured at every transmission period, the representation form of the forward channel state information does not need to be changed. In the case of indicating a relative increase or decrease relative to the R, the increase and decrease must be newly set according to the R-CQICH transmission rate. This is because whenever the base station receives the forward channel state information from the terminal, the signal strength of the forward channel used to determine the packet data rate of the terminal is increased or decreased by the increase or decrease. If the increase / decrease width of the forward channel state information is +/- 0.5 dB when the -CQICH transmission rate is 800 Hz, the increase / decrease width is adjusted at +/- 1 dB intervals when the R-CQICH transmission rate is lowered to 400 Hz. This coordination should be performed at both the terminal and the base station.

5 illustrates an apparatus of a mobile station for controlling a transmission rate of an R-CQICH according to an embodiment of the present invention. The apparatus of the mobile station includes an R-CQICH symbol encoder 500, a sequence repeater 502, a signal point mapper 504, and a Walsh spreader. 506, a channel gain controller 508, a Walsh cover 510, and an R-CQICH rate controller 512.

Referring to FIG. 5, the R-CQICH rate controller 512 determines the transmission period of the R-CQICH using the R-CQICH rate indication information received from the base station. Here, the forward channel state information is updated at a 1.25 ms (N = 1) period interval, which is one slot when the R-CQICH has a transmission rate of 800 Hz, and 2 x 1.25 ms which is two slots when the transmission rate of the R-CQICH is 400 Hz. = 2) It is updated at periodic intervals, and it is updated at 4 x 1.25ms (N = 4) period intervals, which are 4 slots when the R-CQICH has a 200 Hz transmission rate, and 8 x 8 slots when the transmission rate of the R-CQICH is 100 Hz. It is updated at 1.25ms (N = 8) cycle interval.

A 5-bit CQI symbol representing the channel state of the forward link updated every N slots is input to the R-CQICH symbol encoder 500. The encoder 500 encodes the input 5-bit CQI symbol at a code rate of 5/12 and outputs 12 code symbols. Another information transmitted through the R-CQICH is used to transmit a forward channel signal at the terminal. It is a best sector indicator (BSI) indicating one base station (sector in the case of a sector type base station) having a best forward channel state among a plurality of base stations that can be received. The best sector indicator is 3 bits of information determined for each N slot according to the forward channel state. The Walsh cover 510 receives the optimal sector indicator and outputs an 8-bit Walsh cover code corresponding to the input optimal sector indicator. The multiplier 501 codes symbols from the encoder 500. And the Walsh cover code from the Walsh cover 510 are multiplied and output. Here, the multiplier 501 multiplies the 12 code symbols output from the encoder 500 with an 8-bit Walsh cover code output from the Walsh cover 510 to generate a 96-bit sequence. The sequence repeater 502 repeatedly outputs the 96-bit input sequence from the multiplier 501 N times. The repetition frequency N is determined by the R-CQICH rate controller 512. That is, when the transmission rate of the R-CQICH is 800 Hz, N = 1, 400 Hz, N = 2, 200 Hz, N = 4, and 100 Hz, N = 8.

The signal mapper 504 maps bit 0 to +1 and bit 1 to -1 among the outputs of the sequence repeater 502. The Walsh code spreader 506 spreads and outputs the output of the signal mapper 504 with one of twelve Walsh codes of length 16 chips allocated for R-CQICH. The channel gain adjuster 508 multiplies the output of the Walsh code spreader 506 by a predetermined channel gain Gn. The channel gain Gn is set by the R-CQICH rate controller 512 according to the R-CQICH rate.

6A shows channel gain (Gn) when the R-CQICH transmission rate is 800 Hz, and the forward channel state information transmitted through the R-CQICH is updated every 800 Hz and transmitted for one slot. 6B shows channel gain when the R-CQICH data rate is 400 Hz, and the forward channel state information is updated every 400 Hz and transmitted for 2 slots. 6A and 6B, the amount of power required to transmit the same amount of R-CQICH information for one slot regardless of the R-CQICH transmission rate is twice as much as the amount of power required for two slots. many. Therefore, the channel gain Gn is 1, 400 Hz when the R-CQICH data rate is 800 Hz. At 200 Hz , And at 100 Hz Becomes

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention, in particular, determines the R-CQICH transmission rate of a terminal in a forward transmission terminal of a mobile communication system for simultaneously supporting a high speed packet data service and a voice data service, and controls the R-CQICH transmission rate by transmitting the same to the terminal. Therefore, there is an advantage that the transmission rate of the uplink R-CQICH can be freely adjusted according to the amount of base station resources available for packet data service in the forward transmitting end. In addition, the interference amount of the reverse channel can be adjusted by adjusting the transmission rate of the uplink R-CQICH, and the control information on the R-CQICH transmission rate is transmitted in the physical layer, so that the fast control can be performed.

1 is a diagram illustrating signals exchanged between a terminal and a base station to control a transmission rate of an R-CQICH for transmitting forward channel state information in a mobile communication system according to an exemplary embodiment of the present invention.

2 illustrates an apparatus of a base station for determining a reverse R-CQICH data rate according to an embodiment of the present invention.

3 is a diagram illustrating a procedure for determining an R-CQICH transmission rate by using a power amount of a base station and an interference amount of a reverse channel R-CQICH according to an embodiment of the present invention.

4 is a diagram illustrating a procedure for receiving reverse channel R-CQICH rate indication information in a terminal according to an embodiment of the present invention and controlling the rate of reverse channel R-CQICH using this information.

5 illustrates an apparatus of a mobile station for transmitting forward channel state information over an R-CQICH according to an embodiment of the present invention.

FIG. 6A shows channel gain (Gn) when the R-CQICH data rate is 800 Hz. FIG.

FIG. 6B is a diagram illustrating channel gain when the R-CQICH data rate is 400 Hz. FIG.

Claims (21)

delete delete delete delete delete delete delete delete In a mobile communication system supporting a packet data service and a voice service, a method for controlling a transmission rate of a reverse channel quality indication channel (R-CQICH) in which a base station delivers forward channel state information, Determining a transmission rate of the reverse channel quality indication channels based on the sum of the amount of power available for packet data service and the amount of interference measured for the reverse channel quality indication channels from all terminals in the packet data service by the base station; and, And transmitting the indication information on the determined transmission rate to all the terminals. The method of claim 9, And the transmission rate of the reverse channel quality indication channels is determined by any one of 800 Hz, 400 Hz, 200 Hz, and 100 Hz. The method of claim 10, wherein the determining of the transmission rates of the reverse channel quality indication channels, The ratio Pm / Pt of the amount of power Pm usable for the packet data service to the total amount of power Pt of the base station is 50% or more, or the Pm / Pt is 30% or more and less than 50% and the thermal noise power TTN of the base station The ratio Tm / TTN of the sum of the interferences measured is less than 1 dB, or the Pm / Pt is greater than 10% and less than 30% and the Tm / TTN is less than 0.5 dB, or the Pm / Pt is less than 10% and the Tm / If the TTN is less than 0.25 dB, determining the transmission rate at 800 Hz; The Pm / Pt is 30% or more and less than 50% and the Tm / TTN is 1dB or more, The Pm / Pt is 10% or more and less than 30% and the Tm / TTN is 0.5dB or more and less than 1dB, or the Pm / Pt is Determining the transmission rate to 400 Hz when the Tm / TTN is less than 10% and less than 0.25 dB but less than 0.5 dB; If the Pm / Pt is more than 10% and less than 30% and the Tm / TTN is more than 1dB or the Pm / Pt is less than 10% and the Tm / TTN is more than 0.5dB and less than 1dB, determining the transmission rate at 200 Hz Wow, If the Pm / Pt is less than 10% and the Tm / TTN is 1 dB or more, determining the transmission rate at 100 Hz. The method of claim 9, The indication information on the transmission rate of the reverse channel quality indication channels are transmitted to all the terminals through a forward packet data control channel. In a mobile communication system supporting a packet data service and a voice service, a method for controlling a transmission rate of a reverse channel quality indication channel (R-CQICH) in which a base station delivers forward channel state information, In consideration of some or all of the amount of power available for the packet data service and the number of Walsh codes, the amount of interference measured for the reverse channel quality indication channel, the type of packet data service, and the number of terminals in the packet data service by the base station Determining a transmission rate of the reverse channel quality indication channel; And transmitting the indication information on the determined transmission rate to a corresponding terminal. The method of claim 13, The transmission rate of the reverse channel quality indication channel is characterized in that any one of 800Hz, 400Hz, 200Hz, 100Hz. The method of claim 13, And indication information on a transmission rate of the reverse channel quality indication channel is transmitted to the terminal through a forward packet data control channel. In a mobile communication system supporting both a packet data service and a voice service, a method for controlling a transmission rate of a reverse channel quality indication channel (R-CQICH) in which a terminal carries forward channel state information, Receiving indication information on a transmission rate of the reverse channel quality indication channel from a base station; Setting a transmission period of the reverse channel quality indication channel according to the received indication information; And updating the forward channel state information according to the set transmission period and transmitting the reverse channel quality indication channel. 17. The method of claim 16, wherein the indication information on the transmission rate of the reverse channel quality indication channel is received from the base station through a forward packet data control channel. An apparatus of a base station for controlling a transmission rate of a reverse channel quality indication channel (R-CQICH) for transmitting forward channel state information in a mobile communication system supporting both packet data service and voice service, In consideration of some or all of the amount of power available for the packet data service and the number of Walsh codes, the amount of interference measured for the reverse channel quality indication channel, the type of packet data service, and the number of terminals in the packet data service by the base station A rate determiner for determining a rate of the reverse channel quality indication channel; And a transmitter for transmitting indication information on a transmission rate of the determined reverse channel quality indication channel to a corresponding terminal. The method of claim 18, wherein the transmitter, And transmitting indication information on a transmission rate of the reverse channel quality indication channel through a forward packet data control channel. In a mobile communication system supporting a packet data service and a voice service, an apparatus of a terminal for controlling a transmission rate of a reverse channel quality indication channel (R-CQICH) for transmitting forward channel state information, A rate controller for determining a transmission period of the forward channel state information based on the indication information on the rate of the reverse channel quality indication channel from a base station; An encoder which encodes the forward channel state information generated at each transmission period and outputs code symbols; A Walsh cover for outputting a Walsh cover code representing an optimal sector having the best forward channel condition; A multiplier for multiplying the coded symbols and the Walsh cover; A sequence repeater for repeatedly outputting an output sequence from the multiplier by a repetition number determined according to the transmission period; A Walsh spreader for spreading the output from the sequence repeater with a predetermined Walsh code assigned for the reverse channel quality indication channel; And a gain adjuster for outputting the output sequence from the Walsh spreader by multiplying the channel gain determined according to the transmission period. 21. The apparatus of claim 20, wherein the indication information on the transmission rate of the reverse channel quality indication channel is received from the base station through a forward packet data control channel.