JP2000059333A - Device and method for interpolation service for code division multiple access communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the rapid change in the radius and pilot power of a base station and to keep constant the total output strength of the base station by comparing total detected power with a prescribed reference value, determining an interpolation service enable additional channel when the total power is lower than the reference value and using this channel as an interpolation channel. SOLUTION: Total transmission power P adding respective transmission power outputted from squaring instruments 711-71N through an adder 722 is compared with both reference transmission power Plow and Phigh. In the case of P<Plow, the maximum amount of transmissible interpolation data is calculated by an interpolation power calculator 726, a channel number decider 728 determines the transmission amount of interpolation services and data corresponding to this amount are provided through the interpolation channel. In the case of P>=Plow, the following operation related to the addition of interpolation services is stopped. In the case of P<=Phigh, a current state is maintained. In the case of P>Phigh, according to the calculated value of a reduction power calculator 734, a reduction channel number decider 736 decreases the number of interpolation channels and reduces the interpolation services.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data service technology for a mobile communication system, and more particularly to a technology for providing data at high speed using a basic channel and an additional channel.

[0002]

2. Description of the Related Art In a code division multiple access (CDMA) system, the serviceable bit rate is limited to 9.10 per user.
Although it is 6 kbps / 14.4 kbps, a method for providing a high-speed data service beyond such a limit has been proposed, one of which is multi-code.
It is a method. In the multi-code system, a large number of (up to eight) code channels are allocated to a user, and one user is provided with a data service having a bit rate of up to 14.4 kbps × 8.

FIG. 1 shows a terminal (t) in a mobile communication system.
2 shows a configuration of a base station and a radio link structure. The radio link is a forward channel from the base station to the terminal.
el) and a reverse channel from the terminal to the base station (reve
rse channel).

Conventional IS-95 / IS-95A / JS
The CDMA mobile communication system of the TD-008 standard is shown in FIG.
And have forward and reverse channel structures.
As shown in FIG. 2A, the forward channel includes a pilot channel (pilot channel), a synchronization channel (sync channel),
The paging channel includes a paging channel and a forward traffic channel. The reverse channel includes an access channel (a) as shown in FIG. 2B.
ccess channel), reverse traffic channel (reverse t
raffic channel).

The forward code channel is composed of 64 orthogonal Walsh codes,
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 kpbs while maintaining such a structure, one or more Walsh codes or reverse codes must be used in one user's forward and reverse directions. Must.

[0006] For this purpose, it is necessary to subdivide the forward and reverse traffic channels among the CDMA channels shown in FIG. That is, when these are subdivided, a CDMA channel structure as shown in FIG. 3 can be created. At this time, as shown in FIG. 3A, the forward channel includes a pilot channel, a synchronization channel, a paging channel, and a forward traffic channel, and the forward traffic channel is a basic channel (fundamental c).
hannel) and a supplemental channel. Also, the reverse channel includes an access channel and a reverse traffic channel as shown in FIG. 3B,
The reverse traffic channel is the basic channel (fundame
ntal channel) and supplemental channel (supplemental channe)
l).

[0007] It is assumed that a multi-code is used to provide a high-speed data service in such a form. In FIG. 3, the basic channel supports the same functions and bit rates as the conventional forward and reverse traffic channels,
The additional channel is allocated to the requester when the user requests a high-speed data service, and is not used if there is no request. The additional channels can be allocated to one user from 0 to 7 according to the request of the user.

[0008] A user who wants to receive high-speed data service by using an additional channel firstly receives a pilot channel,
It is necessary to obtain connection information of a corresponding base station using a synchronization channel and a paging channel. Next, an attempt is made to connect to the corresponding base station using an access channel using the obtained connection information. If the connection through the access channel is successful, a communication path between the user terminal and the base station is generated and maintained through the basic channels of the forward and reverse traffic channels.

Generally, a data service that a user intends to receive has a burst characteristic. That is, high-speed data to be transmitted or received instantaneously exists, and does not always exist. A period in which data is transmitted and a period in which data is not transmitted coexist. Therefore, the call between the terminal and the base station is closed through the basic channel, and if it is necessary for the user or the base station to transmit high-speed data, this is notified to the other base station or the terminal and the additional channel is used. Should be done. In this negotiation, the fact that the high-speed data has been terminated must be mutually communicated through the closed basic channel, and the additional channel used for the high-speed data must be stopped. An example of such a process is shown in FIG.

First, in step 411, the terminal and the base station set up a call through the basic channel. In step 413, it is checked whether the terminal (base station) performs high-speed data transmission. In the case of high-speed data transmission, at step 415, the terminal (base station) requests (instructs) the base station (terminal) to use the additional channel through the backward (forward) basic channel. Then, in step 417, the base station (terminal) checks whether it can set (receive) the additional channel requested (instructed) from the terminal (base station). as a result,
If it cannot be set (received), the process proceeds to step 419, in which it is notified to the terminal (base station) via the forward (reverse) basic channel that the setting (reception) is not to be made, and the call through the bidirectional basic channel is maintained. It returns to step 413 as it is.

At step 417, setting of an additional channel (reception)
If it is possible, in step 421, the base station (terminal) prepares the corresponding additional channel, and reports the preparation to the terminal (base station) through the forward (reverse) basic channel. The process proceeds to step 423 to perform high-speed data communication between the terminal and the base station using the basic channel and the additional channel. As a result, if the high-speed data communication is not completed, steps 423 and 425 are repeated.

If the high-speed data communication is completed in step 425, the terminal and the base station exchange the termination fact through the forward and reverse basic channels in step 427, and terminate the use of the additional channel accordingly. And the call through the basic channel is maintained. Then, it is checked whether or not the call is terminated while maintaining the call.
The process returns to the third stage, and if it is completed, the call is terminated at the 413 stage.

A high-speed data service using a multicode as shown in FIG. 4 exhibits a code channel occupancy characteristic according to time by a packet type transmission / reception characteristic. That is, there is often time when the use of code channels is concentrated.

FIG. 5 shows the use state of the forward code channel when two users use the high-speed data service by the additional channel. In FIG. 5, the horizontal axis represents time, and the vertical axis represents the number of code channels used. The number of used code channels thus means the load on the forward CDMA channel. Therefore, if the number of code channels used increases, it means that the load increases.

"F" in FIG. 5 indicates a basic channel,
The number next to “F” indicates the user number. For example, "F
1 "means a primary user's basic channel.
“S” indicates an additional channel, the first number next to “S” indicates a user number, and the second number indicates the number of an additional channel to be used. For example, "S2,3" means that the second user uses the third additional channel.

[0016]

Although the above-described high-speed data service method can provide various kinds of additional functions to the user, it also has problems. That is, 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 MA mobile communication network will be reduced. This means that the bit rate of the entire communication network (= the number of users × the bit rate of each user) may change abruptly due to the increase or decrease of users.
It affects the stability of the CDMA mobile communication network. Therefore, in the case of providing a high-speed data service, it is necessary to minimize such inconveniences and to adopt a method that does not affect the basic services provided before.

In a high-speed data service using a multicode as shown in FIG. 4, the total bit rate provided in the forward direction when providing a high-speed data service using the forward additional channel is not sufficient. Become uniform. If the total bit rate is non-uniform, serviceable CDMA
All of the channel capacity cannot be used, and the channel capacity is wasted. That is, according to the arriving packet M / M1 / queing model when all data rates transmitted from the base station are constant, it can be seen that the following Table 1 holds.

[Table 1]

Table 1 is established by the following equation (1).

W = [ρ / (1−ρ)] (1 / μ) ρ ₀ = 1−ρ

Where W is a waiting time, 1 /
μ is the average transmission time, ρ is λ / μ, where λ is the input rate, ρ is the usage rate, and ρ ₀ is the non-use rate. An example of using the additional channel in this case is as shown in FIG. 5. When data service is performed within a predetermined capacity, an unused time slot as shown in FIG. 5 occurs, which is a waste of capacity. become.

If a sudden change in the bit rate occurs, this means a sudden change in the forward load. Such rapid changes may affect stable cell operation. For example, assume that pilot power: voice user power: data user power = 2: 0.4: 8. In addition, 0.4 is a voice activity (voice acti
8 means that eight channels are used as the full rate. If only two cells are considered, it is assumed that each cell has 10 users and only one cell has data users, and if the base station uses a certain total power, then The effect that the cell radius at a certain position is reduced by about 10% occurs. Further, assuming that the base station outputs a constant pilot power, the terminal reports Ec / Io (key parameter of handoff).
r) changes by about 2 dB depending on the presence or absence of a data user.

[0021]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention can provide an interpolation data service at a time when there is no data on a forward traffic channel during communication to maintain a constant data rate. Provide system.
That is, the present invention provides a system capable of providing interpolated data to a corresponding channel during a time when no data is present during communication between a base station and a terminal. Specifically, the present invention provides a system in which a base station sets an interpolation channel on a forward link and can provide interpolation data to the interpolation channel when the total transmission power during communication with a terminal is lower than a reference transmission power.

That is, according to the present invention, as an interpolation service method for a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, a process of detecting the total power of the currently used additional channel, and the detection of the total power of the additional channel. Comparing the total power with a predetermined reference value, and determining an additional channel for which interpolation service can be performed when the total power is determined to be smaller than the reference value, and using the additional channel as the interpolation channel. An interpolation service method is provided.

In the process of detecting the total power of the additional channels, the total power can be calculated by multiplying the number of currently used additional channels by the unit power of the additional channels. Further, in the process of determining an additional channel capable of providing an interpolation service and using the same as the interpolation channel, a process of calculating the number of channels capable of performing the interpolation service by dividing a value obtained by subtracting the total power from the reference value by the unit power of the additional channel, Using the calculated number of channels capable of providing the interpolation service as the interpolation channel, and transmitting the interpolation data according to the priority order. The predetermined reference value may be a lower reference value of the total power that determines the start of the interpolation service. Further, if there is an interpolation channel in the interpolation service when it is determined that the total power is larger than the reference value, a process of reducing the interpolation channel may be performed.

According to the present invention, as an interpolation service device of a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, power measuring means for detecting the total power of the currently used additional channel;
Comparing means for comparing the detected total power with a predetermined reference value; and, as a result of the comparison, determining an additional channel capable of performing interpolation service when the total power is smaller than the reference value and adding an interpolation channel as an interpolation channel. Means for providing an interpolation service device.

The power measuring means comprises a squarer for inputting each power of the additional channel currently used, and an adder for calculating the total power by adding the output power of the squarer. be able to. Further, the interpolation channel adding means calculates an interpolation service power by subtracting the total power from a predetermined reference value, and divides the calculated power by a unit power of the additional channel to perform the interpolation service. A channel number determiner for calculating the number of channels. The predetermined reference value may be a lower reference value of the total power that determines the start of the interpolation service. Furthermore, when the comparison result by the comparing means indicates that the total power is larger than the reference value, it is preferable to include an interpolating channel reducing means for reducing the interpolating channel, if any, during the interpolating service.

According to the present invention, as an interpolation service method for a code division multiple access communication system having a basic channel and an additional channel as traffic channels, a process of detecting the total power of the currently used additional channel, and the detection of the total power of the additional channel are performed. When the total power is smaller than a predetermined first reference value,
Determining an additional channel capable of performing an interpolation service and using the additional channel as an interpolation channel; and, when the detected total power is greater than a predetermined second reference value, if there is an interpolation channel in the interpolation service, the interpolation channel is used. And an interpolating service method characterized by performing the step of reducing.

In the process of detecting the total power of the additional channel, the total power can be calculated by multiplying the number of the currently used additional channels by the unit power of the additional channel. In addition, in the step of determining an additional channel capable of providing an interpolation service and using the same as the interpolation channel, a step of calculating the number of channels capable of performing the interpolation service by dividing a value obtained by subtracting the total power from the first reference value by a unit power of the additional channel. And using the calculated number of channels capable of providing the interpolation service as the interpolation channel and transmitting the interpolation data according to the priority order. The first reference value can be a lower limit reference value of the total power that determines the start of the interpolation service.

Further, in the process of reducing the number of interpolation channels in the interpolation service, the process of confirming the number of interpolation channels currently in service is performed. As a result of the confirmation, if there is an interpolation channel in service, the second power is calculated from the total power. A step of calculating the number of interpolable channels that can be deleted by dividing the subtracted value by the unit power of the additional channel, and a step of deleting the interpolated channels in ascending order of priority by the calculated number of deletable channels, Can be implemented. The second reference value may be an upper limit reference value of the total power for determining the removal of the interpolation channel.

Alternatively, according to the present invention, as an interpolation service device of a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, power measuring means for detecting the total power of the currently used additional channel is provided. A first comparator for comparing the detected total power with a predetermined first reference value, and when the total power is smaller than the first reference value as a result of the comparison by the first comparator, the interpolation service is possible. Interpolation channel adding means for determining an additional channel to be an interpolation channel, a second comparator for comparing the detected total power with a predetermined second reference value, and a result of the comparison by the second comparator, the total power Is larger than the second reference value, and if there is an interpolation channel in the interpolation service, an interpolation channel reduction means for reducing the interpolation channel is provided. Service apparatus is provided.

The power measuring means comprises a squarer for inputting each power of the additional channel currently in use, and an adder for calculating the total power by adding the output power of the squarer. be able to. The interpolation channel adding means calculates an interpolation service power by subtracting the total power from the first reference value, and divides the calculated power by a unit power of the additional channel to perform the interpolation service. A channel number determiner for calculating the number of channels. The first reference value can be a lower limit reference value of the total power that determines the start of the interpolation service.

Further, the interpolation channel reducing means includes an interpolation service checker for checking the number of interpolation channels currently in service, and a result of the check by the interpolation service checker,
If there is an interpolated channel in service, a reduced power calculator that calculates the reducible power by subtracting the second reference value from the total power, and an interpolator that can reduce the calculated power by the unit power of the additional channel And a reduced channel number determiner for calculating the number of channels. The second reference value may be an upper limit reference value of the total power for determining the removal of the interpolation channel.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION In order to suppress rapid changes in the radius of a base station and pilot power due to the load of use of a high-speed data service, the total output intensity of the base station may be kept constant. As a technique for this, when the output intensity is small, predetermined data is output so that the total output of the base station is kept within a predetermined range. Data output when the output of the base station becomes small is interpolation data, and the interpolation service provides this interpolation data. Then, a channel for transmitting the interpolation data is set as an interpolation channel. With this interpolation service, it is possible to keep the base station radius constant, prevent a sudden change in pilot power, and fill the capacity of a temporarily vacant base station with useful information to provide users with low cost. The present invention can provide the mobile communication user with a wider range of choices and increase the use satisfaction.

Since such an interpolation service must be able to be stopped and restarted at any time in accordance with the intensity fluctuation of the output of the base station, the priority of the service is relative to the communication using the basic channel and the additional channel. Should be given a lower priority. This can contribute to stable base station operation.

Interpolation data that can be serviced without any problem even at a low priority include weather information, traffic information, stock information,
It may be useful information such as a time signal and public notice. Also, in the case of a service that requires a long time, such as transmission of a large-capacity file, if the interpolation service is used, the service can be provided at a low price. However, in this case, since it acts as a concept of a service for a specific user, a specific protocol for operating at a low priority is required.

In order to execute the above interpolation service, a terminal capable of receiving the interpolation service is prepared, and a procedure for receiving the interpolation service is determined for the terminal. Then, the interpolation service is actually executed in the following order.

First, if the terminal can perform the interpolation service, it informs the base station that it will receive the interpolation service in the process of setting up the call with the base station, and assigns the orthogonal code number of the interpolation channel provided with the interpolation service to the base station. Receive from The method of assigning orthogonal code numbers from this base station to terminals is as follows:
There are two ways.

One of them is multicast.
Alternatively, a broadcast method is used, in which some orthogonal code numbers in all orthogonal codes are set and used as interpolation channels. In this method, a channel for an interpolation service is fixed and used by using an interpolation channel as a kind of overhead channel. In this case, the interpolation data is traffic,
It consists of information that can be commonly used by terminal subscribers, such as weather and stocks.

The other is a method (point to point) in which a base station provides interpolation data to a channel of a corresponding terminal. In such a case, the terminal processes data received on the forward link through the set channel, and the base station transmits the interpolated data through a set channel in communication in a pause where there is no actual data communication.

Since the Walsh code can be used as the orthogonal code, it will be described below as a Walsh code. The terminal receiving the Walsh code of the interpolation channel in the above call setup process periodically checks and provides the interpolation channel in a time interval between the time when there is no communication or data communication through the basic channel and the additional channel. It monitors whether there is interpolation data of the interpolation channel. Then, when the interpolation data is received through the interpolation channel, the interpolation data is processed.

As described above, of the interpolation services that can be provided, a specific protocol is required for large-capacity file transmission, and no special protocol is required for other popular services. If there is no interpolation data at the time of checking the interpolation channel, the interpolation channel is checked again only after a lapse of a predetermined time, and only when there is no high-speed data communication through the basic channel and the additional channel. Such a process is a process that is performed for a terminal capable of the interpolation service to receive the interpolation service.

The above interpolation service is a service provided when the base station checks its own capacity and has sufficient capacity. Therefore, the interpolation service is basically a forward path as a signal path transmitted from the base station to the terminal. This is a service with content related to links. When providing the interpolation service from the base station, the base station needs to have a means for confirming its own channel capacity, and a determination process for linking this to the availability of the interpolation service is required. To this end, the control processor of the base station calculates
, The transmission signal power level of the base station is determined.

P = G (1) * G (1) + G (2) * G (2)
+ ... + G (N) * G (N)

Where P is the total transmission power of the base station and G
(I), i = 1, 2,..., N is the gain of the i-th channel. That is, the power in each channel of the base station can be represented by the square of the transmission gain of the corresponding channel,
Therefore, the total transmission power of the base station can be represented by the sum of the transmission power of each channel. That is, if the unit power per additional channel is multiplied by the number of additional channels currently in service, the total transmission power at the current base station can be calculated. Through this calculation process, the base station control processor sequentially checks the level of the total transmission power of the base station. The base station determines whether to execute the interpolation service at that time according to the check result of the total transmission power obtained in this manner.

In the case where the interpolation service has already been performed, the base station control processor needs to determine whether or not to continue the interpolation service currently being executed. This determination can be made by Equations 3 and 4 below.

## _EQU3 ## P <P _low

[Mathematical formula-see original _document ] P> P _high

P in Equation 3_low(Lower reference transmission power)
Is a reference value for determining whether to perform the interpolation service.
You. That is, the total transmission power P is P_lowIf less than
Execute the service. Also, P in Equation 4_high(Up
Limit transmit power) to reduce the current interpolation service
This is the reference value for That is, the total transmission power P is P
_highIf it exceeds, the current interpolation channel is controlled and compensated.
Reduce or discontinue service However, it is not limited to this
Can be changed to set only the lower reference value.
You.

According to these equations (3) and (4), the base station control processor compares the total transmission power P of the inspection result with the lower reference transmission power P _low and the upper reference transmission power P _high, and as a result, P is smaller than P _low. By providing an interpolation service through an interpolation channel with values,
It operates to keep the P value of Equation 2 above P _low . Similarly, if P satisfies Equation 3 and the interpolation service has already been provided, the amount of information provided through the interpolation service is increased, that is, the allocation of interpolation channels is increased to make P in Equation 2 _Plow or more. It is possible.

On the other hand, Expression 4 indicates that the total transmission power P is P _high
A case with a larger value is indicated, which indicates that there is no room to provide an interpolation service. That is, if the formula 4 is satisfied, the provision of the interpolation service is impossible. Therefore, if there is an interpolation service already provided, the information amount of the interpolation channel is reduced so that the P value falls below P _high (service reduction). Execute control.

Equations 2 to 4 above clearly show the relationship between the total transmission power and the reference transmission power to be determined by the base station in order to provide the interpolation service.

FIG. 6 shows a configuration of a base station for providing an interpolation service, particularly a portion related to the interpolation service, together with a data flow thereof.

Control processor 61 of base station controller 610
2 repeatedly performs an operation of collecting information for an interpolation service from an upper network and storing the information in the interpolation service database 614. The interpolation service database 61
4 is read by the control processor 612 of the base station controller 610 in response to a request for interpolation data from the base station control processor 621 of the base station 620, and the base station control processor 62 of the base station 620.
1 is transmitted. The base station control processor 621 stores the interpolation service related information output from the control processor 612 of the base station controller 610 in the interpolation data buffer 623 managed by the base station control processor 610 so that it can be transmitted when the interpolation service is provided.

The base station control processor 621, which has determined that the interpolation service should be started by the method according to the above formulas (2) to (4), reads out the interpolation data from the interpolation data buffer 623 and transmits the interpolation channels to the modems 631 to 63.
N to the corresponding modem. Base station control processor 6 after transmitting the interpolation data to modems 631-63N
21 requests the control processor 612 of the base station controller 610 for additional support of the interpolation service-related information. In response, the interpolation service-related information sent from the control processor 612 is stored in the empty area of the interpolation data buffer 623. Put in.

On the other hand, each of the modems 631 to 63N periodically reports the gain G (i) of the currently transmitted signal to the base station control processor 621, whereby the base station control processor 621 And make decisions related to the interpolation service. The transmission signals of these modems 631 to 63N are combined by an adder 641, and then sent out of an antenna through a transmission filter 643, a frequency transition unit 645, and a transmission amplifier 647, and transmitted to a terminal as a forward link signal. You.

FIG. 7 shows an algorithm for determining the start and end of the interpolation service by the base station control processor 621.

Whether each of the modems 631 to 63N of the base station 620 is
G (i) input to the base station control processor 621 from
The value is stored in the corresponding squarer 711-71N.
Converted to transmission power currently transmitted by dem 631 to 63N
Is done. Each output from these squarers 711-71N
The transmission power is added up by the adder 722, so that the base station
The total transmission power of station 620 is calculated. Thus calculated
Total transmission power P is P _lowAnd P_highBoth standards sent
Is compared with the transmission power.

The process of comparing with P _low is performed by the lower limit comparator 724.
Is executed by If P is less than P _low (P <P
_low ), which means that the current total transmission power is smaller than the reference transmission power and there is a surplus channel capacity that can provide an interpolation service. Therefore, the base station control processor 621 can transmit the interpolation data within the allowable range of the channel capacity. In such a case, the interpolation power calculator 726 calculates the maximum amount of interpolable data that can be transmitted according to the difference between P and P _low calculated by the lower limit comparator 724, and the channel number determiner 728 calculates the calculation result. To determine the amount of interpolation service transmission. The corresponding interpolation data will be provided through the interpolation channel.

In the interpolation channel determining process for providing the interpolation service, the channel number determiner 728 determines the number of interpolation channels by the following equation (5).

[Mathematical formula-see original _document ] n = (P _low -P) / P _unit

In the equation, n indicates the number of interpolation channels available for interpolation service, and P _unit indicates transmission power per channel. That is, the interpolation power calculator 726 calculates the power value (P _low −P) at which the interpolation service can be performed, and the
28 divides the power value by the unit transmission power P _unit to determine the number n of interpolation channels available for the interpolation service.

On the other hand, the lower limit comparator 724 sets P to P
_lowIf it is determined that the above is satisfied (P ≧ P _low)Currently
Room to provide additional interpolation services for the existing channel capacity
Not related to the interpolation service addition
Cancel subsequent operations.

On the other hand, P is P_highIs also compared.
That is, P and P _highAnd compare
P is P_highIn the following case (P ≦ P_high) Is the base station
620 indicates that the power is within the transmittable total transmit power range.
Therefore, the present situation can be maintained.

On the other hand, if P exceeds P _high (P> P _high ), it means that excessive power exceeding the total transmission power allowance of the base station 620 is being transmitted.
In such a case, an operation for lowering the total transmission power should be performed by stopping the interpolation service in service. At this time, instead of stopping all interpolation services,
It is preferable to adjust the amount of interpolated data so that P falls just below P _high . Therefore, when P> P _high , the interpolation service checker 732 checks whether or not there is an interpolation service currently in service. If there is no interpolation service, control is performed so that no further operation is performed. On the other hand, if there is an interpolation service currently in service, the reduced power calculator 734 subtracts P _high from the total power P (P−P _high ), and the reduced channel number determiner 736 determines the number of interpolation channels according to the calculated value. Reduce and reduce interpolation services.

When determining the interpolation channel to be reduced in this way, the reduced channel number determiner 736 uses the following equation (6).
The number of interpolation channels to be subjected to the interpolation service reduction control is determined.

N = (P−P _high ) / P _unit

In the equation, n indicates the number of interpolation channels that can be reduced, and P _unit indicates the transmission power per channel. That is, the reduced power calculator 734 obtains a power value (P-P _high ) for controlling the reduction of the interpolation service, and the reduced channel number determiner 736 divides it by the unit transmission power P _unit to reduce the number of interpolation channels to be reduced. To determine. The number-of-reduced-channels determiner 736 compares the calculated number n of reduced channels with the number n ′ of interpolation channels currently being serviced,
If n ≦ n ′, the n interpolation channel services are stopped, and the interpolation service is performed through the remaining n′−n interpolation channels. On the other hand, if n> n ′, stop all interpolation channel services.

As a result of executing the above interpolation service, the total transmission power of the base station is kept constant, which is described in FIG. FIG. 8 shows an example of an interpolation service related to two data users, showing the use of a forward code channel when two users use a high-speed data service through an additional channel. In FIG. 8, the horizontal axis indicates time, and the vertical axis indicates the number of code channels used. The use number of the code channel means the load of the forward CDMA channel.

In the figure, the hatched “C” indicates the interpolation channel, the first number next to the “C” indicates the user number, and the second number indicates the number of the interpolation channel to be used. Represents. For example, C1,5 means that the fifth interpolation channel of the first user is used. As described above, the interpolation channel C performs interpolation service by filling unused and wasted channel resources with useful information, thereby stabilizing system operation and improving channel capacity.

FIG. 9 is a flowchart illustrating an interpolation service execution process and a cancellation process using an interpolation channel when a high-speed data service is provided through a forward additional channel. The interpolation service as shown in FIG. 9 is processed by the base station control processor 621.

When a call is set up between the base station and the terminal through the basic channel in step 911, the base station control processor 621 determines in step 913 a forward additional channel according to the request of the terminal or the need of the base station. The execution of high-speed data service through If it is determined that the data service is to be performed, it is checked in step 915 whether there is a forward additional channel available for providing the data service. If there is no usable additional channel as a result of the check, the process proceeds to step 917. In step 917, if the request is from the terminal, the base station control processor 621 returns to step 913 after notifying the terminal that there is no usable additional channel, and returns to step 913. If it is necessary, 913 as it is
The process returns to the step, and re-executes based on whether the forward additional channel is used.

On the other hand, if there is an additional channel available in step 915, the process proceeds to step 919, where the base station control processor 621 transmits information on the forward link additional channel providing the data service to the terminal through the basic channel. report. In step 921, in order to determine whether to add or delete the interpolation service, a process of calculating the transmission power of the base station including the data service using the newly allocated forward channel is performed. This calculation process is as follows:
based on.

P _{(n + 1)} = P _(n) + _Nsup × _Punit

In the equation, P _(n) is the base station transmission power immediately before starting transmission of a new additional channel, P _unit is the unit transmission power, N _sup is the number of additional channels for the data service to be newly started, P P _{(N + 1)} is the base station transmission power after starting a new additional channel transmission. That is,
Since the transmission power of the base station increases due to the use of the new additional channel, the base station for determining the number of interpolation service channels in the new state is considered in view of this.

When a new base station transmission power value P is obtained in step 921, the base station control processor
Compare with P _{high at the} stage. As a result, P becomes P
If it is larger than _{high, the} process proceeds to step 927 after performing the interpolation channel reduction control in step 925, and if less than P _high , the process directly proceeds to step 927. In step 927, a data service using the forward additional channel is started. That is, data transmission by the forward direction additional channel is started. When the data transmission is started, the base station periodically checks the transmission power of the base station and executes the interpolation channel increase / decrease control of the interpolation service.

At step 929, the base station control processor 621 calculates the transmission power P of the base station and the upper limit reference transmission power P _high.
Compare with As a result, if P is greater than P _high , the process proceeds to step 933 to perform interpolation channel reduction, and P
It proceeds to step 931 if the _high or less proceeds to 935 steps and then add interpolated channel.

FIG. 10 is a flow chart for explaining in detail the interpolation channel reduction control shown in the step 933.

When the interpolation channel reduction is started, first, 1
At step 011, the number of interpolation channels (m) in the service is confirmed. Then, at step 1013, the current base station transmission power P is compared with the upper limit reference transmission power P _high, and P
_The number of channels (n) exceeding _high is calculated. Subsequently, at step 1015, these m and n are compared. If m is equal to or greater than n, that is, if the number of channels to be terminated is smaller than the number of interpolation channels currently being serviced, 101
Proceed to step 7. When the process proceeds to step 1017, the interpolation channel corresponding to n is terminated in consideration of the priority of the ongoing interpolation service, and the process exits. Also,
If m is smaller than n in step 1015, the process proceeds to step 1019, in which all interpolated channels in service are terminated, and the process exits.

FIG. 11 is a flowchart for explaining in detail the interpolation channel addition control shown in step 931 in FIG.

When the addition of the interpolation channel is started, first, 1
In step 111, the current base station transmission power P is compared with the lower limit reference transmission power P _low, and if it is equal to or higher than P _low , the process exits without adding a new interpolation channel.
On the other hand, if P is smaller than P _{low, the} process proceeds to step 1113, and after calculating the number of channels (n) below P _low , the process proceeds to step 1115. In step 1115, services are started in the descending order of the priority of the interpolation service using n interpolation channels, and the process exits.

After deleting or adding the interpolation channel as shown in FIGS. 10 and 11, the base station control processor 621 checks in step 935 whether the data transmission by the forward additional channel is completed. As a result, if the processing has been completed, the process proceeds to step 937, and if not completed, the processing returns to step 929 to periodically perform a channel change operation of the interpolation service according to the base station transmission power fluctuation.

In step 937, the terminal is informed of the end of data transmission on the forward additional channel through the basic channel to the terminal, and interpolation channel addition control for compensating for the base station transmission power that fluctuates due to the end of the additional channel is 939. Perform in stages. After step 939, the process proceeds to step 941 to check the end of the call and terminate the entire flow if the call should be terminated. If not, return to step 913 to check the use of the forward additional channel.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a terminal and a base station and a radio link.

FIG. 2 is a block diagram illustrating a configuration of a CDMA forward channel, and FIG. 2B is a block diagram illustrating a configuration of a reverse channel.

FIG. 3 is a block diagram illustrating the configuration of forward and reverse channels for a CDMA high-speed data service.

FIG. 4 is a flowchart illustrating a process of providing a high-speed data service in a CDMA system having a channel structure as shown in FIG. 3;

FIG. 5 is an explanatory diagram showing an example of using an additional channel for a conventional high-speed data service.

FIG. 6 is a block diagram showing a main configuration of a base station that provides an interpolation service according to the present invention.

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

FIG. 8 is an explanatory diagram showing an example of use of a forward channel implementing the interpolation service of the present invention.

FIG. 9 is a flowchart illustrating a forward data service of a CDMA communication system including an interpolation service process according to the present invention;

FIG. 10 is a flowchart of interpolation channel reduction control in step 933 of FIG. 9;

FIG. 11 is a flowchart of interpolation channel addition control in step 931 in FIG. 9;

[Procedure amendment]

[Submission date] October 28, 1999 (1999.10.
28)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 6

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Claim 11

[Correction method] Change

[Correction contents]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Claim 17

[Correction method] Change

[Correction contents]

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

If the high-speed data communication is completed in step 425, the terminal and the base station exchange the termination fact through the forward and reverse basic channels in step 427, and terminate the use of the additional channel accordingly. And the call through the basic channel is maintained. Then, it is checked whether or not the call is terminated while maintaining the call.
The process returns to the third stage, and when the process is completed, the call is terminated at the 431 stage.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

That is, according to the present invention, as an interpolation service method performed from a base station to a terminal of a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, a forward addition method currently used in the base station is provided. Detecting the total power of the transmission power of the channel, comparing the detected total power with a predetermined reference value, and performing interpolation service when the total power is determined to be smaller than the reference value. Determining an additional channel and using it as an interpolation channel.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

Further, according to the present invention, as an interpolation service device in a base station of a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, a forward additional channel currently used in the base station is used.
Power measuring means for detecting the total power of the transmission power; comparing means for comparing the detected total power with a predetermined reference value; as a result of the comparison, the interpolation service can be performed when the total power is smaller than the reference value. An interpolation channel adding means for determining an additional channel and using the determined channel as an interpolation channel.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

[0026] According to the present invention or, as an interpolation service method performed by the base station of a code division multiple access communication system having an additional channel and a fundamental channel in the traffic channel to the terminal, a forward addition of the currently used base station Detecting the total power of the transmission power of the channel, and determining the additional channel capable of performing the interpolation service when the detected total power is smaller than a predetermined first reference value, and using the determined additional channel as the interpolation channel; The detected total power is a predetermined second power.
And a step of reducing the number of interpolation channels, if any, in the interpolation service when the value is larger than the reference value.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0029

[Correction method] Change

[Correction contents]

Alternatively, according to the present invention, as an interpolation service device in a base station of a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, a forward additional channel currently used in the base station is used. Power measuring means for detecting the total power of the transmission power, and a first means for comparing the detected total power with a predetermined first reference value
A comparator; and an interpolation channel adding means for determining an additional channel capable of providing an interpolation service and setting the additional channel as an interpolation channel when the total power is smaller than the first reference value as a result of the comparison by the first comparator. A second comparator for comparing the total power with the predetermined second reference value, and as a result of the comparison by the second comparator, when the total power is greater than the second reference value, there is an interpolation channel in the interpolation service. For example, there is provided an interpolation service device comprising: an interpolation channel reducing unit for reducing the interpolation channel.

[Procedure amendment 10]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 11]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

[Procedure amendment 12]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

[Procedure amendment 13]

[Document name to be amended] Drawing

[Correction target item name] Fig. 7

[Correction method] Change

[Correction contents]

FIG. 7

[Procedure amendment 14]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

[Procedure amendment 15]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 10

[Procedure amendment 16]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 11

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kang Hye-en 1499, Mok-myeon 7-dong, Jungnam-gu, Seoul, Republic of Korea 12 Building 1401 F-term (Reference) 5K022 EE01 EE11 EE21 EE31 5K067 AA21 AA33 CC00 CC10 EE02 EE10 GG01 HH22 JJ11 JJ17

Claims (22)

[Claims] 1. An interpolation service method for a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, comprising: detecting a total power of the currently used additional channel;
Comparing the detected total power with a predetermined reference value, and determining an additional channel capable of performing interpolation service when the total power is determined to be smaller than the reference value, and using the additional channel as the interpolation channel. The interpolation service method. 2. The interpolation service method according to claim 1, wherein, in the step of detecting the total power of the additional channels, the total power is calculated by multiplying the number of currently used additional channels by the unit power of the additional channels. 3. In the process of determining an additional channel capable of providing an interpolation service and using the additional channel as an interpolation channel, a value obtained by subtracting a total power from a reference value is divided by a unit power of the additional channel to calculate the number of channels capable of providing an interpolation service. Using the calculated number of interpolable serviceable channels as an interpolation channel and sending interpolation data according to priority,
3. The interpolation service method according to claim 1, wherein 4. The interpolation service method according to claim 3, wherein the predetermined reference value is a lower limit reference value of the total power for determining the start of the interpolation service. 5. The interpolation service method according to claim 1, wherein if there is an interpolation channel in the interpolation service when the total power is determined to be larger than the reference value, a step of reducing the interpolation channel is performed. 6. An interpolation service device for a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, comprising: power measuring means for detecting the total power of the currently used additional channel; Comparing means for comparing the total power with a predetermined reference value, and an interpolation channel adding means for determining an additional channel capable of performing an interpolation service when the total power is smaller than the reference value and for setting the interpolation channel as an interpolation channel, An interpolation service device comprising: 7. The power measuring means comprises: a squarer for inputting power of each of the additional channels currently in use; and an adder for calculating the total power by adding the output power of the squarer. 6. The interpolation service device according to 6. 8. An interpolation channel addition means for calculating an interpolation serviceable power by subtracting a total power from a predetermined reference value, and dividing the calculated power by a unit power of the additional channel to perform interpolation. 8. The interpolation service apparatus according to claim 6, further comprising a channel number determiner for calculating a serviceable channel number. 9. The interpolation service method according to claim 8, wherein the predetermined reference value is a lower limit reference value of the total power for determining the start of the interpolation service. 10. The interpolation apparatus according to claim 6, further comprising: an interpolation channel reduction unit that reduces an interpolation channel in an interpolation service if the total power is larger than the reference value as a result of the comparison by the comparison unit. Service equipment. 11. An interpolation service method for a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, comprising: detecting a total power of the currently used additional channel;
Determining an additional channel capable of providing an interpolation service when the detected total power is smaller than a predetermined first reference value and using the additional channel for the interpolation channel; And a step of reducing the number of interpolation channels, if any, in the interpolation service when the interpolation service is larger. 12. The method according to claim 1, wherein the step of detecting the total power of the additional channel calculates the total power by multiplying the number of currently used additional channels by the unit power of the additional channel.
2. The interpolation service method according to 1. 13. The method of determining an additional channel capable of providing an interpolation service and using the additional channel as an interpolation channel, divides a value obtained by subtracting the total power from the first reference value by a unit power of the additional channel to obtain the number of channels capable of providing the interpolation service 13. The interpolation service method according to claim 11, wherein the step of calculating and the step of using the calculated number of channels capable of providing an interpolation service as an interpolation channel and transmitting interpolation data according to a priority order are performed. 14. The interpolation service method according to claim 13, wherein the first reference value is a lower limit reference value of the total power for determining the start of the interpolation service. 15. The process of reducing the number of interpolation channels in an interpolation service is a process of checking the number of interpolation channels currently in service, and as a result of the check, if there is an interpolation channel in service, a second reference from the total power. A step of calculating the number of interpolable channels that can be deleted by dividing the subtracted value by the unit power of the additional channel, and a step of deleting the interpolated channels in ascending order of priority by the calculated number of deletable channels, The interpolation service method according to any one of claims 11 to 14, further comprising: 16. The interpolation service method according to claim 15, wherein the second reference value is an upper limit reference value of the total power for determining the removal of the interpolation channel. 17. An interpolation service apparatus for a code division multiple access communication system having a basic channel and an additional channel in a traffic channel, comprising: power measuring means for detecting the total power of the currently used additional channel; A first comparator for comparing the total power with a predetermined first reference value, and determining, as a result of the comparison by the first comparator, an additional channel capable of performing an interpolation service when the total power is smaller than the first reference value. An interpolation channel adding means for converting the detected total power to a predetermined second reference value, and a second comparator for comparing the detected total power with a predetermined second reference value. An interpolation service device comprising: an interpolation channel reducing unit that reduces an interpolation channel, if any, in an interpolation service when the value is larger than the value. 18. A power measuring means comprising: a squarer for inputting each power of an additional channel currently being used; and an adder for calculating the total power by adding the output power of the squarer. 18. The interpolation service device according to item 17. 19. An interpolation channel adding means for calculating an interpolable service power by subtracting the total power from the first reference value, and interpolating the calculated power by dividing the calculated power by the unit power of the additional channel. 19. The interpolation service apparatus according to claim 17, further comprising: a channel number determiner for calculating a serviceable channel number. 20. The interpolation service apparatus according to claim 19, wherein the first reference value is a lower limit reference value of the total power for determining the start of the interpolation service. 21. The interpolation channel reducing means, comprising: an interpolation service checker for checking the number of interpolation channels currently in service; and, if the interpolation service checker confirms that there is an interpolation channel in service, the interpolation power checker calculates the total power. A reduced power calculator that calculates a reducible power by subtracting a second reference value;
21. The interpolation service device according to claim 17, further comprising: a reduced channel number determiner configured to calculate the number of reducible interpolation channels by dividing the calculated power by the unit power of the additional channel. 22. The interpolation service apparatus according to claim 21, wherein the second reference value is an upper limit reference value of the total power for determining the deletion of the interpolation channel.