KR100251698B1 - Complementary service apparatus and method in communication system - Google Patents

Abstract

PURPOSE: A complementary service device and a method of a communication system are provided to use a resource efficiently, and to improve a reliability of a system and a channel capacity by using a complementary channel in a CDMA mobile communication system. CONSTITUTION: In order to supply a complementary service, Plow and Phigh are compared. When P of a total transmission power is smaller than the Plow, namely the total transmission power is smaller than a reference power, this means that there is a spare channel capacity for the complementary service. A complementary data capacity capable of being transmitted maximally is calculated according to a difference of the P and the Plow calculated by a base station processor(724). After this, the decider(728) supplies the complementary service pertinent to the complementary data capacity through a complementary channel. In the result of a comparison of the second comparator(730), when the P is bigger than a Phigh, this means that a transmitted power is bigger than the total transmission power of a base station. In this case, the total transmission power of the base station is decreased by stopping the complementary service. At this time, the total transmission power of the base station is decreased until the P is same and smaller than the Phigh.

Description

Complementary service apparatus and method of communication system

The present invention relates to a data service method of a communication system, and more particularly, to a method of serving data at high speed using a complementary channel.

In code division multiple access (CDMA) systems, the serviceable bit rate limit is 9.6 Kbps / 14.4 Kbps per user. In addition, methods for overcoming these limitations and providing high-speed data services have been proposed, and one of them is a multi-code method. The multi-code scheme assigns multiple (up to eight) code channels to one user and allows one user to receive data services with bit rates up to 14.4 Kbps * 8.

The high speed data service method as described above may provide various kinds of additional functions to a user, but has other problems corresponding thereto. In other words, by providing a high-speed data service, one user can transmit and receive a large amount of data, the number of users who can use the CDMA mobile communication network relatively decreases, which means that as the number of users increases or decreases, It means that the bit rate (i.e. number of users * bit rate of each user) can change rapidly. Therefore, in this case, a problem may occur in the stability of the CDMA mobile communication network.

Therefore, when performing the high-speed data service as described above, it is necessary to minimize the adverse situation and to use a method that does not cause a failure in the basic service previously provided.

1 is a block diagram illustrating a configuration of a terminal and a base station and a radio link structure in a mobile communication system. In FIG. 1, a radio link includes a forward channel transmitted from a base station to a terminal side and a reverse channel transmitted from the terminal to a base station side.

The conventional CDMA mobile communication system of IS-95 / IS-95A / J-STD-008 has forward and reverse channel structures as shown in FIGS. 2A and 2B. In a conventional CDMA mobile communication network, a forward channel includes a pilot channel, a sync channel, a paging channel, and a forward traffic channel, as shown in FIG. 2A. In addition, in the conventional CDMA mobile communication network, the reverse channel includes an access channel and a reverse traffic channel as shown in FIG. 2b.

The forward code channel consists of 64 orthogonal Walsh codes, and one forward traffic channel occupies one Walsh code. Therefore, each of the forward and reverse traffic channels has a transmission bit rate of 9.6 Kbps / 14.4 Kbps as a limit value. In order to provide a high speed data service exceeding 14.4 Kbps while maintaining the structure as described above, one or more Walsh codes or reverse codes should be used for one user in the forward and reverse directions.

In order to do this, segmentation of forward and reverse traffic channels among CDMA channels such as FIGS. 2A and 2B is required. By subdividing them, a CDMA channel structure as shown in FIGS. 3A and 3B can be created. In this case, the forward channel consists of a pilot channel, a synchronization channel, a paging channel, and a forward traffic channel, as shown in FIG. 3A. The forward traffic channel includes a fundamental channel and a supplemental channel. In addition, the reverse channel is composed of an access channel and a reverse traffic channel, and the reverse traffic channel is composed of a fundamental channel and a supplemental channel.

In the case of the high-speed data service in the form described above, it is said that the multi code is used. 3A and 3B, the basic channel supports the same function and bit rate as the conventional forward and reverse traffic channels. And the additional channel is assigned to the user who requested it when there is a user's request for a high-speed data service, and is not used when there is no request. The additional channels may be assigned to one user from 0 to 7 according to the user's request.

In this case, when a user wants to receive a high speed data service using the additional channel, first, access information of a corresponding base station should be obtained using a pilot channel, a synchronization channel, and a paging channel. Next, the access information is attempted to the corresponding base station through the access channel. If the access through the access channel is successful, a connection path between the user terminal and the base station is created through the base channel of the forward and reverse traffic channels. After the connection passage is created, the connection through the basic channel is maintained.

In general, a data service that a user wants to receive has a burst characteristic. That is, there is high speed data to transmit or receive instantaneously, but this may not always exist. In other words, the period of sending data and the period of not sending coexist. From this point of view, if a call is established between the terminal and the base station through the basic channel, and the user or the base station needs to transmit the high speed data, the base station or the terminal should be notified and the additional channel should be used only in this case. The above-described negotiation process should inform each other of the termination through the existing basic channel and stop using the additional channel in use.

An example of such a process is shown in FIG. In FIG. 4, the terminal will be described.

First, in step 411, the terminal and the base station set up the call through the basic channel. In step 413, the terminal (base station) checks whether high-speed data transmission is performed. In this case, in step 415, the terminal (base station) requests (indicates) the use of the additional channel to the base station (terminal) through the base channel in the reverse (forward) direction. In step 417, the base station (terminal) checks whether an additional channel requested (indicated) by the terminal (base station) can be set (received). If setup (reception) is impossible at this time, proceed to step 419 and notify the terminal (base station) through the basic channel in the forward (reverse direction) not setting (receivable), and maintain the call through the basic channel in both directions The flow returns to step 413.

However, if it is possible to set up (receive) the additional channel in step 417, in step 421, the base station (terminal) prepares the additional channel and informs the terminal (base station) of the prepared channel through the forward (reverse) base channel. In step 423, the high speed data is transmitted and received between the terminal and the base station using the base channel and the additional channel. In step 425, the high speed data is transmitted and received. At this time, if the transmission and reception of the high speed data is not completed, the steps 423 and 425 are repeated.

However, if the transmission and reception of the high-speed data is completed in step 425, the terminal and the base station exchanges the fact that the terminal is terminated through the forward and reverse base channels in step 427, after which the use of the additional channel is terminated and the call through the base channel Keep it. In the state of maintaining the call as described above, it is checked whether the call is ended, or the flow returns to step 413, otherwise the call is terminated in step 431.

As shown in FIG. 4, the high-speed data service using the multi-code eventually exhibits a code channel occupancy characteristic over time due to packet transmission / reception characteristics.

In other words, the use of the code channel is concentrated for a certain time, but there are many times when it is not.

5 shows the use of a forward code channel when two users use a high speed data service on an additional channel. In FIG. 5, the horizontal axis represents time and the vertical axis represents the number of code channels used. The number of use of the code channel eventually means the load of the forward CDMA channel. In other words, as the number of code channels used increases, the load increases.

In FIG. 5, F represents a basic channel, and the number next to F represents a user's number. Therefore, F1 means the basic channel of user 1. In FIG. 5, S denotes an additional channel, and the first number next to S represents the number of the user and the second number represents the number of additional channels to be used. Accordingly, S2 and 3 mean that additional channel 3 of user 2 is used.

However, the high speed data service using the multi-code as described above has the following problems. As shown in FIG. 4, in the conventional high speed data service method, when a high speed data service using a forward additional channel is provided, a nonuniformity of a total bit rate provided in the forward direction is generated, and a sharp bit rate is caused. A change occurs.

The former problem is that the total bit rate is non-uniform, so that the capacity of the serviceable CDMA channel cannot be used up, thereby wasting channel capacity. This can be explained in the following manner. According to the packet M / M1 / queing model in which all data rates transmitted from the base station are constant and arrive, it can be seen that Table 1 below is established.

Table 1 is established by the relationship shown in Equation 1 below.

In Equation 1, W is a waiting time, 1 / μ is an average transmission time, ρ is λ / μ, λ is an input rate, ρ is a utilization rate, and ρ 0 is It shows the specific usage rate. In this case, an example of using the additional channel is shown in FIG. When the data service is performed within the capacity defined in FIG. 5, unused timeslots are generated as shown in FIG. 5, which wastes capacity.

The sudden change in bit rate indicated by the latter problem means a sudden change in load in the forward direction. Such rapid change may cause problems in stable cell operation, which can be explained in the following manner. Assume that the power ratio of pilot power to voice user to power user is 2: 0.4: 8. In this case, 0.4 denotes voice activity and 8 denotes a case where 8 channels are used at full rate. Considering only two cells, assuming that each cell has 10 users and only one cell, and the base station uses a constant total power, the cell radius at the location of the data user is reduced by about 10%. do. In addition, assuming that the base station outputs a constant pilot power, the Ec / lo (key parameter of the handoff) reported by the terminal may change by 2 dB depending on the presence or absence of a data user.

The two problems described above result in the operation of a stable communication network and waste of channel capacity.

Accordingly, an object of the present invention is to provide an apparatus and method capable of maintaining a constant data rate by performing a complementary data service at a time when data is not loaded on a communicating forward traffic channel in a communication system.

Another object of the present invention is an apparatus for establishing a complementary channel on a forward link in a communication system and serving complementary data to the complementary channel when the total transmit power is lower than the reference transmit power while communicating with terminals. In providing a method.

It is still another object of the present invention to provide an apparatus and method for servicing complementary data in a corresponding channel during a time when data is not loaded while a base station is communicating with a terminal in a communication system.

A forward link data service method of a communication system according to an embodiment of the present invention for achieving the above object, detects the total transmission power transmitted by the base station, and complementary data to the complementary channel when the total transmission power is lower than the reference transmission power Inserting and transmitting on the forward link, and the terminal receives and processes complementary data on the forward link.

1 is a diagram showing a configuration of a terminal and a base station of a communication system and a structure of a radio link.

2A and 2B show forward and reverse channel structures according to the code division multiple access standard.

3A and 3B illustrate forward and reverse channel structures in accordance with a new code division multiple access standard for high speed data services.

FIG. 4 is a flowchart illustrating a process of performing data service using an additional channel in a code division multiple access system having a channel structure as shown in FIGS. 3A and 3B.

5 illustrates an example of use of an additional channel for high data service.

6 is a diagram illustrating a configuration of a base station for providing a complementary service according to an embodiment of the present invention, particularly with respect to complementary service related parts and related information flow and signal flow.

7 is a block diagram of an algorithm for determining the start and end of complementary services in a base station control processor of a base station in accordance with an embodiment of the present invention.

8 shows an example of the use of a forward channel to which a complementary channel is applied in accordance with an embodiment of the invention.

9 is a flowchart illustrating a process of performing a complementary service by assigning a complementary channel according to an embodiment of the present invention.

As described above, in order to reduce the sudden change of the base station radius and the pilot power according to the high-speed data service user load of the base station, a method capable of keeping the intensity of the total output signal of the base station constant is required. In this way, in order to keep the signal strength constant, when the output signal strength is small, a predetermined information is outputted so that the entire output signal of the base station can be maintained within a predetermined range.

In the embodiment of the present invention, when the intensity of the output signal is maintained in the above manner, information output when the base station output signal is reduced is called complementary data, and providing the complementary data is called complementary service. In addition, a channel to which the complementary data is transmitted is referred to as a complementary channel.

The purpose of the complementary service is to prevent a sudden change in pilot power while maintaining a constant base station radius. Another purpose of the complementary service is to widen the capacity of the base station that is empty at the moment and provide it to the user at a low price by providing useful information to the user, thereby increasing the user's choice and increasing the user satisfaction.

Since the complementary service provided for this purpose should be able to be stopped and resumed at any time according to the variation of the output signal strength of the base station, the priority of the service has a lower priority than the call attempt using the base channel and the additional channel. Should have This can contribute to stable base station operation.

Complementary data that can be serviced at low priorities can be weather information, traffic information, stock information, time signals, advertising, and other information. In addition, even a time-consuming service such as a large file transfer may be provided at a low price when using a complementary service. However, in this case, since it acts as a service concept for a specific user, a specific protocol is required to operate at a low priority. In the case of such a protocol is not the scope of the present invention, the detailed description thereof will be omitted.

In order to perform the complementary service as described above, there must be a terminal for receiving the complementary service. In addition, the order for receiving the complementary service should be determined. When there is a terminal capable of complementary services as described above, the service is performed in the following order.

First, the terminal to receive the complementary service informs the base station that it will receive the complementary service during the call setup process with the base station, and receives the orthogonal code number of the complementary channel provided with the complementary service from the base station. The method for allocating an orthogonal code number to a terminal in the base station may use two methods. One method is a multicast or broadcast method in which some orthogonal code numbers of all orthogonal codes are set as complementary channels. In this manner, the complementary channel is used as a kind of overhead channel so that the channel for the complementary service is fixed. In this case, the complementary service may be information that can be commonly used by the subscribers, such as traffic, weather, stocks, and the like. The other method is a point to point in which a base station serves complementary data to a channel of a corresponding terminal. In this case, the terminal processes the data received through the forward link through the established channels, and the base station transmits complementary data to the corresponding channel during the idle period in which no actual data is communicated to the established channel in the communicating state.

Here, the orthogonal code may use a Walsh code. Hereinafter, the orthogonal code is assumed to be a Walsh code. Complementary service capable terminal receiving Walsh code of complementary channel in the call setup process periodically checks complementary channel in time between call or data transmission and reception through base channel or additional channel. Check for information. If there is information received through the complementary channel at the time of the check, the terminal uses the information of the corresponding complementary channel.

The process of setting up the complementary channel is shown in FIG. First, in step 911, the terminal and the base station set up the call through the basic channel. In step 913, the terminal (base station) checks whether high-speed data transmission is performed. In this case, in step 915, the terminal (base station) requests (indicates) the use of the additional channel to the base station (terminal) through the base channel in the reverse direction (forward direction). In step 917, the base station (terminal) checks whether the additional channel requested (indicated) by the terminal (base station) can be set (received). If setup (reception) is not possible, proceed to step 919 to notify the terminal (base station) of the setup (receipt possible) through the forward (reverse) base channel, and maintain the call through the base channel in both directions. The process then returns to step 913.

However, if it is possible to set up (receive) the additional channel in step 917, the base station (terminal) prepares the additional channel in step 921, and notifies the terminal (base station) that the prepared channel is ready through the forward (reverse) base channel. In step 923, high-speed data is transmitted and received using an additional channel set between the terminal and the base station. And after the process proceeds to step 925 base station total transmission power (p) is a predetermined reference transmit power P is _high more than 935 steps, and determines a complementary service channels in the 927 step is less than P _high, executing a complementary data service in 929 steps . Thereafter, if the base station total transmission power P is less than or equal to the predetermined reference power P _high in step 931, the process returns to step 927, and returns to step 935 or more above P _high . In step 935, it is checked whether high-speed data transmission and reception are completed. At this time, if the data transmission and reception is not completed, the high-speed data is transmitted and received while repeating the steps 923 to 935.

However, if the transmission and reception of data is completed in step 935, the terminal and the base station exchanges the fact that the termination through the forward and reverse base channel in step 937, and then terminates the use of the additional channel and maintains the call through the base channel. do. If the call is maintained in the state of maintaining the call as described above, the process returns to step 913. Otherwise, the call ends at step 941.

Among the complementary services that can be provided as described above, a large file transfer requires a specific protocol, and other popular services do not require a special protocol. When there is no information related to the complementary service at the time of checking the complementary channel, the complementary channel is checked only when a certain time elapses and there is no data transmission or reception through the base channel or the additional channel. These processes go through the process of receiving the complementary service from the terminal capable of complementary service.

Since the complementary service is a service provided when the capacity is sufficient by checking the capacity of the base station, it is basically a service related to the forward link, which is a signal path transmitted from the base station to the terminal. When the base station provides the complementary service, the base station needs a method for identifying its channel capacity, and a determination process for linking the complementary service with the availability of the complementary service is required. To this end, the control processor of the base station determines the power level of the transmission signal transmitted from the corresponding base station using the method as shown in Equation 2 below.

In Equation 2, P is the total power of the signal transmitted from the base station, G (i), i = 1, 2, ..., N is the gain of the i-th channel. That is, the power of each channel of the base station can be expressed by the square of the transmission gain of the channel, and the total transmission power of the base station can be expressed as the sum of the transmission powers of all individual channels. Through this process, the base station control processor can check the level of the total transmit power of the base station at the corresponding moment. The base station control processor may determine whether there is a complementary service at a corresponding point in time using a result of checking the total transmit power of the base station. And if the complementary service is already in progress, the base station control processor should determine whether to continue the currently running complementary service, this determination is made by the following equation (3) and (4).

In the above Equation 3, P _low is a reference transmission power for determining whether to perform the complementary service in the base station, hereinafter referred to as "lower limit reference transmission power". That is, when the total transmission power P becomes less than or equal to the P _low value, the base station starts to perform complementary services through the complementary channel. In addition, in Equation 4, P _high is a reference transmission power for reducing and controlling the complementary service being performed by the base station, and is referred to as "upper reference transmission power" hereinafter. That is, when the total transmission power P becomes equal to or higher than the P _high value, the base station controls the complementary channel being performed to reduce or stop the performance of the complementary service.

According to Equation 3 and Equation 4, the base station control processor compares the total transmission power P, which is a result of the check, with P _low and P _high , which are determination criteria for complementary service. In this case, when P has a value smaller than P _low as shown in Equation 3, the base station control processor provides a complementary service through a complementary channel, thereby maintaining P value of Equation 2 above P _low. To perform the operation. If the P value of Equation 2 is the total transmission power satisfying Equation 3 and the complementary service has already been provided, the base station control processor increases the amount of information provided through the complementary service, that is, allocates a complementary channel. As a result, P value of Equation 2 is maintained above P _low .

In addition, Equation 4 indicates a case in which the P value, which is the total transmission power, has a value larger than P _high , which indicates that there is no spare power capable of providing complementary service. That is, in the case of Equation 4, not only the complementary service can be provided, but if there is a complementary service that is already provided, the value of P must be smaller than P _high by reducing the information amount of the complementary channel. it means.

Equations 2, 3, and 4 above specify the relationship between the total transmit power and power reference values of the base station, which the base station control processor must determine in order to provide the complementary service. As an embodiment for realizing such a relationship and the present invention, the configuration and operation of the present invention will be described using FIGS. 6 and 7.

FIG. 6 illustrates a configuration of a base station for providing a complementary service, and particularly shows parts related to the complementary service and related information and information flow.

Referring to FIG. 6, the control processor 612 of the base station controller 610 repeatedly collects information to be provided to the complementary service from the upper network and stores the information to the complementary service database 614. The information stored in the complementary service database 614 as described above is read by the control processor 612 of the base station controller 610 when the complementary data request is received from the base station control processor 621 of the base station 620 and transmitted to the base station control processor 621 of the base station 620. .

Then, the base station control processor 621 of the base station 620 stores the complementary service related information output from the control processor 612 of the base station controller 610 in the complementary data buffer 623 managed by the base station controller 610 so that it can be transmitted when providing the complementary service.

If the base station control processor 621 of the base station 620 should start the complementary service by the method described above with respect to Equation 2, Equation 3, and Equation 4, the base station control processor 621 is complementary data buffer After reading information related to the complementary service at 623, the information is transmitted to the corresponding modem among modems 631-63N that will transmit the complementary channel. After reading the information from the complementary data buffer 623 and transferring it to the modems 631-63N, the base station control processor 621 of the base station requests the control processor 612 of the base station controller for additional support of complementary service related information, and the control processor 612 receives the complementary information. When the service related information is transmitted, the base station control processor 621 refills the received complementary service related information with the empty complementary data buffer 623.

In this case, each of the modems 631-63N periodically reports gains G (i), i = 1, 2, ..., N of signals currently transmitted by the base station control processor 621 of the base station, and the base station control processor 621 By checking this total transmit power, decisions can be made regarding complementary services. The transmission signals of each of the modems 631-63N are combined in the adder 641, and then transmitted through the transmission filter 643, the frequency shifter 645, the transmission amplifier 647 and the antenna, and are output to the terminals as signals of the forward link.

7 is a block diagram illustrating an algorithm for determining the start and end of a complementary service in the base station control processor 621.

Referring to FIG. 7, signals G (i), i = 1, 2, ..., N, which are input to the base station control processor 621 in each of the modems 631-63N of the base station 620, respectively, correspond to a squarer. At 711-71N, the corresponding modems 631-63N are converted to their respective transmit powers. As described above, the total transmission power of the base station 620 is calculated by summing all the transmission powers output from the squarers 711-71N in the adder 722. The total transmit power P calculated in this way is compared with the reference power related to the complementary service provision of P _low and P _high .

Looking at the first comparison process with _low P, wherein P is is conceivable the case when P is less than the _low and equal to or greater. The first comparator 724 compares P and P _low . In this case, when P is smaller than P _low (P <P _low ), it means that the current total transmit power is smaller than the reference power, and thus, there is a remaining channel capacity for providing complementary service. Accordingly, the base station control processor 621 can transmit complementary data in a range allowed by the channel capacity. In this case, the first calculator 726 calculates the maximum amount of complementary data that can be transmitted by the difference between P and P _low calculated by the first comparator 724, and the first determiner 728 calculates the complementary service transmission amount according to the calculation result. After the decision, the corresponding complementary service is provided through the complementary channel.

When determining a complementary channel for performing the complementary service, the first determiner 728 determines the number of complementary channels according to Equation 5 below.

In Equation 5, n represents the number of complementary channels capable of complementary services, and Punit means transmit power per channel. Accordingly, the first calculator 726 obtains a power value P _low -P capable of complementary service, and the first determiner 728 divides the power value capable of complementary service by the channel transmission power P _unit, and the number of complementary channels available for complementary service n. Determine.

However, when P and P _low in the first comparator 724 are greater than or equal to (P≥P _low ), it means that there is no free capacity to provide complementary service at the current channel capacity. Stop further action.

The second comparator 730 compares P and P _high . At this time, when the comparison result P of the second comparator 730 is smaller than or equal to P _high (P> P _high ), since the base station 620 transmits within the range of total transmission power that can be transmitted, the complimentary service previously served Even if there is an operation can be stopped without action. However, when P is greater than P _high (P> P _high ), the comparison of the second comparator 730 means that excessive power is being transmitted compared to the total transmission power of the base station 620. In this case, an operation for lowering the total transmit power of the base station 620 should be performed by stopping the complementary service that is already being serviced. In this case, it is preferable not to stop all complementary services, but to adjust the amount of complementary data so that only P is smaller than or equal to P _high . Therefore, if P> P _high , the complementary service checker 732 checks whether there is a complementary service that is currently being serviced, or does not take any further action. However, if there is complementary service currently in service, the second calculator 734 subtracts Phigh from the total power P (PP _high ), and the second determiner 736 is in a range where the total power P is less than or equal to P _high (P≤P). Reduce the complementary service so that it only hits _high ).

When determining a complementary channel for performing the complementary service, the second determiner 736 determines the number of complementary channels for reducing and controlling the complementary service according to Equation 6 below.

In Equation 6, N denotes the number of complementary channels capable of complementary services, and P _unit means transmit power per channel. Accordingly, the second calculator 734 obtains a power value PP _high for reducing and controlling the complementary service, and the second determiner 736 divides it into channel transmission power P _unit to determine the number of complementary channels N to be reduced and controlled. .

That is, the second determiner 736 compares N with the number of complementary channels currently in service, and if N≤No, stops the N complementary channel services and performs complementary services only through (No-N) complementary channels. If N> No, stop all complementary channel services.

8 is a view showing the effect of the complementary service according to the embodiment as described above, that is, the aspect that the total transmission power of the base station is kept constant. 8 shows an example of a complementary service associated with two data users.

8 illustrates the use of a forward code channel when two users use a high speed data service on an additional channel. In FIG. 8, the horizontal axis represents time and the vertical axis represents the number of code channels used. The number of use of the code channel means the load of the forward CDMA channel.

In FIG. 8, F represents a basic channel, and the number next to F represents a user's number. Therefore, F1 means the basic channel of user 1. In addition, S means an additional channel, the first number next to S represents the number of the user and the second number represents the number of additional channels used. Therefore, S2 and 3 mean that additional channel 3 of user 2 is used.

Here, C in the shaded portion of FIG. 8 means a complementary channel, and the first number next to C represents the number of the user and the second number represents the number of the complementary channel to be used. Therefore, C1,5 means that complementary channel 5 of user 1 is used. In this case, the complementary channel C performs complementary service by filling channel resources wasted by non-use with useful information, thereby stabilizing the operation of the system and improving channel capacity.

As described above, by using a complementary channel to perform a complementary service in a CDMA mobile communication system, wasteful resources can be usefully used, thereby improving the stability and channel capacity of the system.

Claims (24)

A data service method of a communication system in which a forward traffic channel includes a base channel and an additional channel, the total transmission power transmitted by a base station is detected, and complementary data is set to preset complementary channels when the total transmission power is lower than a reference transmission power. Complementary data service method of a communication system characterized in that for transmitting on the forward link. The method of claim 1, wherein the processing of the complementary data of the forward link by the terminal comprises: requesting the complementary service when establishing a call with the base station, and receiving an orthogonal code number of the complementary channel output from the base station; And a step of displaying the complementary data when the complementary data is received. The method of claim 1 or 2, wherein the step of transmitting the complementary data is determined by subtracting the total transmission power from the reference transmission power value and dividing this value by transmission power for each channel to determine the number of channels to be complementary. Complementary data service method of a communication system, characterized in that for carrying the complementary data on the corresponding complementary channels of the determined channel number. A data service method of a communication system in which a forward traffic channel includes a base channel and an additional channel, the total transmission power transmitted by a base station is detected, and complementary data is set to preset complementary channels when the total transmission power is lower than a reference transmission power. And transmitting the data on the forward link, and receiving and processing the complementary data on the forward link by the terminal. The method of claim 4, wherein the processing of the complementary data of the forward link by the terminal comprises: requesting the complementary service when setting up a call with the base station; and receiving an orthogonal code number of the complementary channel output from the base station. And a step of displaying the complementary data when the complementary data is received. The method of claim 4 or 5, wherein the step of transmitting the complementary data is determined by subtracting the total transmission power from the reference transmission power value and dividing this value by the transmission power of each channel to determine the number of channels to be complementary service. Complementary data service method of a communication system, characterized in that for carrying the complementary data on the corresponding complementary channels of the determined channel number. A data service method of a communication system in which a forward traffic channel includes a base channel and an additional channel, the method comprising: detecting a total transmission power transmitted by a base station, wherein the total transmission power is lower than a reference transmission power; Complementary data service method of a communication system, characterized in that the channel is not transmitted data is set to the complementary channel, and the complementary data is put on the complementary channels and transmitted on the forward link. The method of claim 7, wherein the processing of the complementary data of the forward link by the terminal comprises: requesting the complementary service when establishing a call with the base station, and receiving an orthogonal code number of the complementary channel output from the base station; And a step of displaying the complementary data when the complementary data is received. The method of claim 7 or 8, wherein the step of transmitting the complementary data is determined by subtracting the total transmission power from the reference transmission power value and dividing this value by the transmission power of each channel to determine the number of channels to be complementary service. Complementary data service method of a communication system, characterized in that for carrying the complementary data on the corresponding complementary channels of the determined channel number. A data service method of a communication system in which a forward traffic channel includes a base channel and an additional channel, the method comprising: detecting a total transmission power transmitted by a base station, wherein the total transmission power is lower than a reference transmission power; A process in which data is not being transmitted is set as a complementary channel, and the complementary data is put into the complementary channels and transmitted on the forward link, and the terminal receives and processes the complementary data on the forward link. Complementary data service method of a mobile communication system. The method of claim 10, wherein the processing of the complementary data of the forward link by the terminal comprises: requesting the complementary service when establishing a call with the base station, and receiving an orthogonal code number of the complementary channel output from the base station; And a step of displaying the complementary data when the complementary data is received. The method of claim 10 or 11, wherein the step of transmitting the complementary data is determined by subtracting the total transmission power from the reference transmission power value and dividing this value by transmission power for each channel to determine the number of channels to be complementary service. Complementary data service method of a communication system, characterized in that for carrying the complementary data on the corresponding complementary channels of the determined channel number. A data service method of a communication system in which a forward traffic channel includes a basic channel and an additional channel, the method comprising: detecting a total transmission power transmitted by a base station and preset complementary channels when the total transmission power is lower than a lower limit reference transmission power; Loading complementary data on the forward link; and checking whether there is a complementary service currently in service when the total transmit power is higher than an upper limit reference transmit power, and reducing the complementary service within the allowable range of the complementary service. Complementary data service method of a communication system, characterized in that consisting of. The method of claim 13, wherein the processing of the complementary data of the forward link by the terminal comprises: requesting the complementary service when setting up a call with the base station; and receiving an orthogonal code number of the complementary channel output from the base station. And checking the complementary channel at a predetermined time period during communication and displaying the complementary data when receiving the complementary data. The method of claim 13 or 15, wherein the step of transmitting the complementary data is determined by subtracting the total transmission power from the lower limit reference transmission power value and dividing this value by the channel unit transmission power to determine the number of channels to be complementary service. And transmitting the complementary data on corresponding complementary channels of the determined number of channels, and transmitting the complementary data. The channel according to any one of claims 13 to 15, wherein the reducing of the complementary service is performed by subtracting an upper reference transmission power value from the total transmission power and then dividing and controlling the value by dividing the transmission power of each channel. And determining complementary number and reducing the determined number of channels from the number of channels currently being serviced to transmit complementary data. A data service method of a communication system in which a forward traffic channel includes a base channel and an additional channel, wherein the base station detects a total transmission power, and assigns to preset complementary channels when the total transmission power is lower than a lower limit reference transmission power. Carrying complementary data on the forward link, and checking whether there is a complementary service currently in service when the total transmit power is higher than an upper limit reference transmit power, and reducing the complementary service within the allowable range of the complementary service. And a process of requesting the complementary service when the terminal establishes a call with the base station, receiving an orthogonal code number of the complementary channel output from the base station, and displaying the complementary data when receiving the complementary data. Base station and terminal complementary channels of the forward link It is received a complementary way data service in a communication system, characterized in that for processing the complementary data. 18. The method of claim 17, wherein the processing of the complementary data of the forward link by the terminal comprises: requesting the complementary service when establishing a call with the base station, and receiving an orthogonal code number of the complementary channel output from the base station; And a process of inspecting the complementary channel at a predetermined time period during communication and displaying the complementary data when receiving the complementary data. The method of claim 17 or 18, wherein the step of transmitting the complementary data is determined by subtracting the total transmission power from the lower reference transmission power value and dividing this value by the transmission power of each channel to determine the number of channels to be complementary. And complementary data on the corresponding complementary channels of the determined channel number and transmit the complimentary data. 20. The channel according to any one of claims 17 to 19, wherein the step of reducing the complementary service is to subtract the upper reference transmission power value from the total transmission power, and then divide this value by the channel-based transmission power to reduce and control the channel. And determining complementary number and reducing the determined number of channels from the number of channels currently being serviced to transmit complementary data. A data service apparatus of a communication system in which a forward traffic channel includes a basic channel and an additional channel, comprising: means for detecting a total transmission power by the base station detecting the sum of the transmission powers of the respective channels, and the total transmission power being the lower limit reference transmission; When it is lower than the power, after subtracting the total transmission power from the lower reference transmission power, the amount of complementary service transmission information is determined, and the unused forward traffic channels are set as a complementary channel, and the complementary data is put into the complementary channel on the forward link. When the first means for transmitting and the total transmission power is higher than the upper limit reference transmission power, the presence or absence of the complementary service currently in service, and the difference between the total transmission power and the current transmission power when the complementary service is in service, and within the allowable range And second means for reducing the complementary service, wherein the terminal Receiving the transmitted complementary data in the complementary channel of the link and the complementary data services apparatus in a communication system, it characterized in that it processes. 22. The apparatus of claim 21, wherein the first means comprises: a first comparator having a lower reference transmission power value, comparing the total transmission power with the lower reference transmission power, and an output of the first comparator, A first calculator which subtracts the total transmission power from the lower reference transmission power value when the transmission power is lower than the lower reference transmission power, and the additional channel that is not in use after determining the amount of complementary service transmission information according to the output of the first calculator; And a first determiner configured to set a complementary channel to the complementary channel and transmit the complementary data to the forward link on the forward link. 23. The output of the second comparator according to claim 21 or 22, wherein the second means includes a second comparator having an upper limit reference transmit power value and comparing the total transmit power with the upper limit reference transmit power. When the total transmission power is higher than the upper limit reference transmission power, and the complementary service checker that checks whether there is a complementary service currently in service, and the output of the complementary service checker, the total transmit power and current And a complementary service controller configured to reduce a complementary service within an allowable range by inputting an output of the second calculator and an output of the second calculator. 24. The apparatus of claim 23, wherein the detecting means comprises: squarers for calculating transmission powers of respective channels by squaring the transmission signal of each channel, and an adder for calculating the total transmission power by summing outputs of the squarers. Complementary data service device of the mobile communication system.

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