KR100266718B1 - Method for channel allocation in cdma channel - Google Patents

Abstract

According to the present invention, when the base station system receives a call in the frequency band requested by the terminal in order to prevent the disparity of the inter-frequency (channel-to-channel) call volume, it selects a frequency that can maintain the call most efficiently among the frequencies of the base station, By allocating the call resource of the selected frequency to the terminal, it distributes the load of the base station system and implements the optimization of the propagation environment between the base station and the terminal to improve the performance of the base station system and the call quality of the channel being called.

To this end, the present invention selects a frequency holding the smallest call among the resources of the frequency of the base station allocates the call resources. In addition, it allocates call resources by selecting a frequency that maintains the minimum call resource usage ratio among the resources of the base station. In addition, an operator operating a base station selects a frequency that maintains the smallest call and allocates call resources when the number of busy channels of the requested frequency exceeds a threshold set initially. In addition, when the call channel usage ratio of the requested frequency exceeds the threshold with the threshold set by the operator operating the base station, the operator selects a frequency that maintains the minimum call resource usage ratio among the resources of the base station. Allocate resources. In addition, when the operator operating the base station has a threshold set initially and the relative value of the number of talk channels on the requested frequency is larger than the threshold, the call resource is allocated by selecting a frequency maintaining the minimum talk channel. In addition, the operator operating the base station has a threshold set initially, and if the relative value of the call channel use rate of the requested frequency is greater than the threshold, the call resource is allocated by selecting a frequency maintaining the minimum call use rate.

Description

Channel Allocation Method for Code Division Multiple Access System

TECHNICAL FIELD The present invention relates to channel assignment of mobile communication systems (especially digital cellular systems and personal digital communication systems (PCS) using the CDMA scheme). A method for allocating a load of a base station system and optimizing the propagation environment between the base station and the terminal to improve the performance of the base station system and to improve the call quality of the channel being talked about. will be.

As is well known, a mobile communication system is a communication system for a mobile device such as a person, a car, a ship, a train, an aircraft, and includes a mobile phone (mobile phone, a vehicle phone), a port phone, an aircraft phone, a mobile public phone ( Trains, cruise ships, express buses), radio calling, radiotelephony, satellite mobile communication, amateur radio, and fishing service ships.

Such mobile communication includes an AMPS (ADVANCED MOBILE PHONE SERVICE) system using an analog method, a CDMA system using a DIGITAL method, a TDMA system, and a FDMA (FREQUENCY DIVISION MULTIPLE ACCESS: frequency division multiple access) system.

As shown in FIG. 1, the CDMA system selectively or simultaneously supports the services of the AMPS system and the services of the CDMA system, thereby being a terminal device that enables a subscriber to communicate through a mobile communication network. (1); A base station (BASE TRANSCEIVER SUBSYSTEM) 2 for communicating with the terminal 1 using a protocol defined in IS-95 in a wireless section; A base station controller (3) which controls the radio link and the wire link and performs a handoff function for maintaining the continuity of the call even when the subscriber is moving; A switching station (MOBILE SWITCHING CENTER) 4 which constitutes a subscriber's call path and performs a connection with another communication network; Subscriber information is entered, consisting of a home location register (HOME LOCATION REGISTER) (5) and the like to communicate with the switching center (4), the terminal through the base station (2) and the control station (3) and the switching center (40) A device for realizing the call of (10).

The conventional channel allocation (frequency allocation) method in such a general CDMA mobile communication system is as follows.

First of all, the terminal selects its own frequency from the list of frequencies sent from the base station by performing a hash function using its phone number as a key from the list of frequencies owned by the base station system. Adjust

Thereafter, the terminal requests the call at the adjusted frequency, and the base station system allocates the call resource of the frequency requested by the terminal among the resources of the system to notify the terminal.

The terminal acquiring this information maintains a call with the base station through the allocated call resource.

However, this conventional channel allocation method has a problem that the base station cannot properly distribute the call volume of the biased frequency when the frequency allocation depends on each terminal and the terminals in the area of the base station in operation are biased to a specific frequency band. there was.

Accordingly, the present invention has been proposed to solve various problems occurring in the channel allocation of the conventional CDMA system as described above.

The present invention divides the load of the base station system by inducing the call of the terminal in the appropriate frequency band from the base station for the call required from the terminal, and implements the optimization of the propagation environment between the base station and the terminal to improve the performance of the base station system and An object of the present invention is to provide a channel allocation method of a code division multiple access system for improving call quality.

That is, the present invention achieves the load sharing of the base station system by allocating appropriate resources to the call required from the terminal, and improves the performance of the base station system by optimizing the radio wave environment and reduces the call quality of the channel being called. It is to provide a method for allocating channels to be reduced.

The first channel allocation method according to the present invention for achieving the above object,

In the channel allocation method of the CDMA system

Transmitting a frequency list of the base station to the terminal, and selecting a frequency band having the smallest number of talk channels allocated for the call of other terminals among the resources of each frequency when a call request is made from the terminal. Steps;

A second step of selecting a call channel that is not in a call among the call channels of the selected frequency and allocating a corresponding call resource to the requesting terminal;

And a third step of increasing the number of call channels allocated to the terminal to a predetermined value and transmitting information of the call resource of the selected frequency to the corresponding terminal.

The method may further include a fourth step of releasing a call resource of a corresponding frequency when the call is terminated after the third step and reducing the number of call channels to be talked at the selected frequency by the increased predetermined value. .

The second channel allocation method according to the present invention for achieving the above object,

In the channel allocation method of the CDMA system,

Transmitting a frequency list owned by the base station to the terminal, and selecting a frequency band having a minimum call channel usage rate among resources of each frequency if a call request exists at the adjusted frequency from the terminal;

A second step of selecting a call channel that is not in a call among the call channels of the selected frequency and allocating a corresponding call resource to the requesting terminal;

And a third step of increasing the number of call channels allocated to the terminal to a predetermined value and transmitting information of the call resource of the selected frequency to the corresponding terminal.

The method may further include a fourth step of releasing a call resource of a corresponding frequency when the call is terminated after the third step and reducing the number of the call channels talked to the selected frequency by the increased predetermined value. .

In addition, the call channel usage rate is calculated as (number of talk channels in frequency / number of talk channels available in frequency) * 100 (%).

The third channel allocation method according to the present invention for achieving the above object,

In the channel allocation method of the CDMA system,

After setting an initial threshold for allocating the minimum call resource use frequency, the base station transmits a list of frequencies owned by the base station, and if there is a call request with the adjusted frequency from the terminal, the number of call channels of the requested frequency and the set initial threshold Comparing the first step with;

A second step of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal if the number of call channels of the requested frequency is smaller than the initial threshold as a result of the comparison;

If the number of communication channels of the requested frequency is greater than the initial threshold as a result of the comparison, the terminal requesting a call by selecting a frequency band of the minimum calling channel and selecting a non-calling communication channel among the communication channels of the selected frequency. A third step of allocating the corresponding call resource to the controller and increasing the number of call channels by a predetermined value;

A fourth step of transmitting information of a call resource of the selected frequency to the corresponding terminal after the second and third steps;

When the call is terminated after the fourth step, a fifth step of releasing the call resource of the corresponding frequency and reducing the number of the call channels talked to the selected frequency by the increased predetermined value.

A fourth channel allocation method according to the present invention for achieving the above object,

In the channel allocation method of the CDMA system,

After setting an initial threshold for frequency allocation of the minimum call resource use rate, the base station transmits a list of frequencies owned by the base station, and if a call request exists at the adjusted frequency from the terminal, the call channel use rate and the set frequency of the requested frequency are set. A first step of comparing the initial thresholds;

A second step of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal if the rate of use of the call channel of the requested frequency is less than the initial threshold;

As a result of the comparison, if the call channel usage rate of the requested frequency is greater than the initial threshold, select a frequency band having the minimum call channel usage rate, and select a call channel that is not in a call among the call channels of the selected frequency to make a call. A third step of allocating a corresponding call resource to the requesting terminal and increasing the number of call channels by a predetermined value;

A fourth step of transmitting information of a call resource of the selected frequency to the corresponding terminal after the second and third steps;

When the call is terminated after the fourth step, a fifth step of releasing the call resource of the corresponding frequency and reducing the number of the call channels talked to the selected frequency by the increased predetermined value.

The fifth channel allocation method according to the present invention for achieving the above object,

In the channel allocation method of the CDMA system,

After setting an initial threshold for allocating the minimum call resource use frequency, the base station transmits a list of frequencies owned by the base station, and if a call request exists at the adjusted frequency from the terminal, A first step of comparing the initial thresholds;

A second step of allocating a call resource of a requested frequency and increasing the number of call channels allocated to the terminal when the relative value of the number of use of talk channels at the requested frequency is less than the initial threshold value;

As a result of the comparison, if the relative number of call channel usage of the requested frequency is larger than the initial threshold, a frequency band having the minimum number of call channel usage is selected, and a call channel that is not in a call is selected among the call channels of the selected frequency. A third step of allocating a corresponding call resource to a terminal requesting a call and increasing the number of call channels by a predetermined value;

A fourth step of transmitting information of a call resource of the selected frequency to the corresponding terminal after the second and third steps;

When the call is terminated after the fourth step, a fifth step of releasing the call resource of the corresponding frequency and reducing the number of the call channels talked to the selected frequency by the increased predetermined value.

In the above description, the use number relative value of the call channel is calculated by subtracting the number of the call channels on the frequency maintaining the minimum call from the number of call channels on the corresponding frequency.

The sixth channel allocation method according to the present invention for achieving the above object,

In the channel allocation method of the CDMA system,

After setting an initial threshold for allocating the minimum call resource use frequency, the base station transmits a list of frequencies owned by the base station, and if a call request exists at the adjusted frequency from the terminal, A first step of comparing the initial thresholds;

A second step of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal if the relative value of the call channel usage ratio of the requested frequency is less than the initial threshold;

As a result of the comparison, if the relative value of the talk channel use rate of the requested frequency is larger than the initial threshold, the frequency band having the minimum talk channel use rate is selected, and the call channels that are not in the call are selected from the talk channels of the selected frequency. A third step of allocating a corresponding call resource to a terminal requesting a call and increasing the number of call channels by a predetermined value;

A fourth step of transmitting information of a call resource of the selected frequency to the corresponding terminal after the second and third steps;

When the call is terminated after the fourth step, a fifth step of releasing the call resource of the corresponding frequency and reducing the number of the call channels talked to the selected frequency by the increased predetermined value.

In the above, the use rate relative value of the call channel may be calculated by subtracting the use rate of the call channel of the frequency maintaining the minimum call use rate from the call channel use rate of the corresponding frequency.

1 is a system schematic configuration diagram of a general mobile communication system;

2 is a flowchart of a first embodiment of a channel allocation method of a code division multiple access system according to the present invention;

3 is a flowchart of a second embodiment of a channel allocation method of a code division multiple access system according to the present invention;

4 is a flowchart of a third embodiment of a channel allocation method of a code division multiple access system according to the present invention;

5 is a flowchart of a fourth embodiment of a channel allocation method of a code division multiple access system according to the present invention;

6 is a flowchart of a fifth embodiment of a channel allocation method of a code division multiple access system according to the present invention;

7 is a flowchart of a sixth embodiment of a channel allocation method of a code division multiple access system according to the present invention;

<Description of the code | symbol about the principal part of drawing>

1: terminal

2: base station

3: control station

4: mobile communication exchange

5: home location register

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

First, prior to explaining the embodiment of the present invention will be described briefly the overall concept of the present invention.

According to the present invention, when the base station system receives a call in the frequency band requested by the terminal in order to prevent the disparity of the inter-frequency (channel-to-channel) call volume, it selects a frequency that can maintain the call most efficiently among the frequencies of the base station, By allocating the call resource of the selected frequency to the terminal, it distributes the load of the base station system and implements the optimization of the propagation environment between the base station and the terminal to improve the performance of the base station system and the call quality of the channel being called.

To this end, the present invention proposes the following six methods.

First, a method of allocating call resources by selecting a frequency that maintains the smallest call among the resources of the base station,

Secondly, a method of allocating call resources by selecting a frequency that maintains a minimum call resource use ratio among resources of a base station;

Thirdly, a method of allocating call resources by selecting a frequency that maintains the smallest call when an operator operating a base station has a threshold set initially and the number of busy channels having a requested frequency exceeds a threshold;

Fourth, the operator operating the base station selects a frequency that maintains the minimum call resource use rate among the resources of the frequency that the base station has when the call channel use rate of the required frequency exceeds the threshold with the threshold set initially. How to allocate resources,

Fifth, if the operator operating the base station has a threshold set initially and the relative value of the number of talk channels on the requested frequency is greater than the threshold, the method for allocating call resources by selecting a frequency maintaining the minimum number of talk channels,

Sixth, when the operator operating the base station has a threshold set initially and the relative value of the call channel usage rate of the requested frequency is larger than the threshold, the call resource is allocated by selecting a frequency maintaining the minimum call usage rate. .

Hereinafter, the six channel allocation methods described above will be described in more detail.

<Example 1>

2 is a flowchart illustrating a first embodiment of a channel allocation method according to the present invention.

As shown in the figure, the base station transmits a list of frequencies owned by the base station, and if there is a call request at the adjusted frequency from the terminal, the number of call channels allocated for the call of other terminals is lowest among the resources of each frequency. A first step (S1-S5) of selecting a frequency band; A second step (S6) of selecting a call channel that is not in a call among the call channels of the selected frequency and allocating corresponding call resources to the requesting terminal; A third step (S7-S8) of increasing the number of call channels allocated to the terminal by a predetermined value and transmitting information of the call resource of the selected frequency to the corresponding terminal; and when the call is terminated after the third step, the call of the corresponding frequency. A fourth step (S9-S11) is performed to release resources and to reduce the number of communication channels that have been called at the selected frequency by the increased predetermined value.

In the first channel allocation method according to the present invention, the base station transmits a list of frequencies owned by the base station to the terminal (S1).

The terminal receiving the frequency list adjusts its channel frequency to the frequency selected by its hash function in the frequency list, and requests a call at the adjusted frequency (S2-S3).

The base station which is requested to allocate the call resource selects a frequency having the minimum call channel by comparing the number of call channels in use between frequencies (S4 to S5).

The call resources of the selected call frequency of the selected frequency are not allocated to the call (S6), and the number of used call channels of the selected frequency is increased by one (S7).

In the above, the call resource refers to a trunk between a base station and a control station, a frame offset, a Walsh code, an output power value, a call channel, and the like.

Thereafter, the selected frequency and the information of the call channel are transmitted to the terminal (S8), and the terminal receiving the information is made to the received frequency and then makes a call to the assigned call channel (S9).

When the terminal terminates the call in the call state as described above, the base station recognizes this and releases the call resource of the corresponding frequency, decreases the number of the call channels again by increasing the number of the call channels, that is, the channel. The allocation process ends (S10-S11).

<Example 2>

3 is a flowchart of a second embodiment of a channel allocation method according to the present invention.

As shown in the drawing, the base station transmits a frequency list of the base station to the terminal, and if there is a call request at the adjusted frequency from the terminal, selects a frequency band having a minimum call channel usage ratio among resources of each frequency. Step 1 (S12-S16) and; A second step (S17) of selecting a call channel that is not in a call among the call channels of the selected frequency and allocating a corresponding call resource to the requesting terminal; A third step (S18-S19) of increasing the number of call channels allocated to the terminal by a predetermined value and transmitting information of the call resource of the selected frequency to the corresponding terminal; When the call is terminated after the third step, a fourth step (S20-S22) of releasing a call resource of a corresponding frequency and reducing the number of talk channels on the selected frequency by the increased predetermined value.

According to the second embodiment of the channel allocation method according to the present invention, the base station transmits a list of frequencies owned by the base station to the terminal (S12).

The terminal receiving the frequency list adjusts its channel frequency to the frequency selected by its hash function in the frequency list, and requests a call at the adjusted frequency (S13-S14).

The base station, which has been requested to allocate the call resource, compares the number of call channels in use between frequencies and selects a frequency band having a minimum call channel use rate (S15-S16).

Here, the call channel usage ratio is calculated as (number of talk channels in frequency / number of talk channels available in frequency) * 100 (%).

The call resources of the selected call frequency of the selected frequency are not allocated to the call (S17), and the number of used call channels of the selected frequency is increased by one (S18).

Thereafter, the selected frequency and the information of the call channel are transmitted to the terminal (S19), and the terminal receiving the information is made to the received frequency and then makes a call to the assigned call channel (S20).

When the terminal terminates the call in the call state as described above, the base station recognizes this and releases the call resource of the corresponding frequency, decreases the number of the call channels again by increasing the number of the call channels, that is, the channel. The allocation process ends (S21-S22).

<Example 3>

4 is a flowchart of a third embodiment of a channel allocation method according to the present invention.

As shown in the figure, after setting an initial threshold for allocating the minimum call resource use frequency, the base station transmits a frequency list owned by the base station, and if there is a call request with the adjusted frequency from the terminal, the number of call channels of the requested frequency. A first step (S23-S28) for comparing with the set initial threshold value; A second step (S29-S31) of allocating call resources of the requested frequency and increasing the number of call channels allocated to the terminal if the number of call channels of the requested frequency is smaller than the initial threshold as a result of the comparison; ; If the number of communication channels of the requested frequency is greater than the initial threshold as a result of the comparison, the terminal requesting a call by selecting a frequency band of the minimum calling channel and selecting a non-calling communication channel among the communication channels of the selected frequency. A third step (S32-S35) of allocating the corresponding call resource to the call channel and increasing the number of call channels by a predetermined value; A fourth step (S36) of transmitting the information of the call resource of the selected frequency to the corresponding terminal after the second and third steps; When the call is terminated after the fourth step, a fifth step (S37-S39) is performed to release the call resource of the corresponding frequency and reduce the number of the call channels that have been talked at the selected frequency by the increased predetermined value.

In the third embodiment of the channel allocation method according to the present invention made as described above, the base station first sets an initial threshold value for the minimum call resource use frequency allocation (S23). Thereafter, the terminal transmits its own list of frequencies to the terminal (S24), and the terminal receiving the frequency list adjusts its channel frequency to the frequency selected by its hash function among the frequency lists, and adjusts the adjusted frequency. The call is requested by the frequency (S25-S26).

The base station that is requested to allocate call resources from the terminal compares the number of talk channels of the requested frequency with the initially set threshold (S28), and the number of talk channels of the requested frequency is smaller than the initial threshold. If so, the terminal selects a frequency requested by the terminal and allocates a call resource in a non-call state among call resources of the selected frequency (S29-S30). The number of used communication channels of the selected frequency is increased by one (S31).

In addition, when the number of talk channels of the requested frequency is larger than the initial threshold, the number of talk channel usage between each frequency is compared (S32), and a frequency having the minimum number of talk channel usage is selected (S33). Thereafter, the call resources of the selected call frequency in the non-call state are allocated (S34), and the number of used call channels of the selected frequency is increased by one (S35).

After the step S31 or step S35, information on the selected frequency and communication channel is transmitted to the terminal (S36). The terminal receiving the information readjusts the channel frequency to the received frequency and then makes a call to the assigned call channel (S37).

Thereafter, the base station checks whether the terminal terminates the call and when the terminal terminates the call (S38), releases the call resource of the corresponding frequency, decreases the number of call channels by 1 and terminates the channel allocation process (S39).

<Example 4>

5 is a flowchart of a fourth embodiment of a channel allocation method according to the present invention.

As shown here, after setting an initial threshold for frequency allocation of the minimum call resource usage rate, the base station transmits a frequency list owned by the base station, and if a call request exists at the adjusted frequency from the terminal, the call channel of the requested frequency. A first step (S40-S45) of comparing the use ratio with the set initial threshold value; A second step (S46-S48) of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal if the rate of use of the call channel at the requested frequency is less than the initial threshold; ; As a result of the comparison, if the call channel usage rate of the requested frequency is greater than the initial threshold, select a frequency band having the minimum call channel usage rate, and select a call channel that is not in a call among the call channels of the selected frequency to make a call. A third step (S49-S52) of allocating corresponding call resources to the requested terminal and increasing the number of call channels by a predetermined value; A fourth step (S53) of transmitting the information of the call resource of the selected frequency to the corresponding terminal after the second and third steps; When the call is terminated after the fourth step, a fifth step (S54-S56) is performed in which the call resources of the corresponding frequency are released and the number of the call channels talked on the selected frequency is decreased by the increased predetermined value.

According to the fourth embodiment of the method for allocating a channel according to the present invention as described above, first, an initial threshold value for frequency allocation of a minimum call resource use ratio is set at a base station (S40). Thereafter, the terminal transmits a list of frequencies it has (S41), and the terminal, which has received the frequency list, adjusts its channel frequency to the frequency selected by its hash function among the frequency lists, and adjusts the channel frequency. The call is requested by the frequency (S42-S43).

The base station that is requested to allocate the call resource from the terminal compares the call channel use rate of the requested frequency with the initially set threshold (S44-S45), whereby the call channel use rate of the requested frequency is the initial threshold value. If smaller, the terminal selects a requested frequency and allocates a call resource in a non-call state among call resources of the selected frequency (S46-S47). The number of used communication channels of the selected frequency is increased by one (S48).

In addition, when the call channel usage rate of the requested frequency is greater than the initial threshold, the call channel usage ratio between the frequencies is compared (S49), and the frequency having the minimum call channel usage ratio is selected (S50). Subsequently, a call resource of a call frequency of a selected frequency that is not in a call is allocated (S51), and the number of used call channels of the selected frequency is increased by one (S52).

After the step S48 or step S52, information on the selected frequency and communication channel is transmitted to the terminal (S53). The terminal receiving the information readjusts the channel frequency to the received frequency and then makes a call to the assigned call channel (S54).

Thereafter, the base station checks whether the terminal terminates the call and when the terminal terminates the call (S55), releases the call resource of the corresponding frequency, decreases the number of call channels by 1 and terminates the channel allocation process (S56).

<Example 5>

6 is a flowchart of a fifth embodiment of a channel allocation method according to the present invention.

As shown in the figure, after setting an initial threshold for allocating the minimum call resource use frequency, the base station transmits a frequency list owned by the base station, and if there is a call request with the adjusted frequency from the terminal, the number of use of the call channel of the requested frequency. A first step (S57-S62) for comparing a relative value with the set initial threshold value; A second step of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal by a predetermined value when the relative value of the number of use of the talk channel at the requested frequency is less than the initial threshold (S63-S65); )Wow; As a result of the comparison, if the relative number of call channel usage of the requested frequency is larger than the initial threshold, a frequency band having the minimum number of call channel usage is selected, and a call channel that is not in a call is selected among the call channels of the selected frequency. A third step (S66-S69) of allocating corresponding call resources to a terminal requesting a call and increasing the number of call channels by a predetermined value; A fourth step (S70) of transmitting the information of the call resource of the selected frequency to the corresponding terminal after the second and third steps; When the call is terminated after the fourth step, a fifth step (S71-S73) is performed to release the call resource of the corresponding frequency and reduce the number of the call channels that have been called at the selected frequency by the increased predetermined value.

In the fifth embodiment of the channel allocation method according to the present invention, the initial threshold for frequency allocation of the minimum number of call resource usages is first set by the base station (S57). Thereafter, the terminal transmits a list of frequencies it has (S58), and the terminal receiving the frequency list adjusts its channel frequency to the frequency selected by its hash function in the frequency list, and adjusts the adjusted frequency. The call is requested by the frequency (S59-S60).

The base station that is requested to allocate the call resource from the terminal compares the relative number of call channel usage of the requested frequency with the initially set threshold (S61-S62), and the relative number of call channel usage of the requested frequency. If it is smaller than the initial threshold, the terminal selects a frequency requested by the terminal and allocates a call resource in a non-talk state of the call resources of the selected frequency (S63 to S64). The number of used communication channels of the selected frequency is increased by one (S65).

Here, the relative value of the number of use of the talk channel of the requested frequency is calculated by subtracting the number of talk channels of the frequency maintaining the minimum talk from the number of talk channels of the corresponding frequency.

In addition, when the relative value of the talk channel usage number of the requested frequency is larger than the initial threshold value, the talk channel usage ratio between the frequencies is compared (S66), and the frequency having the minimum number of talk channel usage is selected (S67). ). Thereafter, the call resources of the selected call frequency in the non-call state are allocated (S68), and the number of used call channels of the selected frequency is increased by one (S69).

After the step S65 or step 69, information on the selected frequency and communication channel is transmitted to the terminal (S70). The terminal receiving the information readjusts the channel frequency to the received frequency and then makes a call to the assigned call channel (S71).

Thereafter, the base station checks whether the terminal terminates the call and when the terminal terminates the call (S72), releases the call resource of the corresponding frequency, decreases the number of call channels by 1 and terminates the channel allocation process (S73).

<Example 6>

7 is a flowchart of a sixth embodiment of a channel allocation method according to the present invention.

As shown here, after setting an initial threshold for frequency allocation of the minimum call resource usage rate, the base station transmits a frequency list owned by the base station, and if a call request exists at the adjusted frequency from the terminal, the call channel of the requested frequency. A first step (S74 to S79) of comparing the use ratio relative value with the set initial threshold value; A second step of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal if the relative value of the call channel use ratio of the requested frequency is less than the initial threshold (S80 to S82); )Wow; As a result of the comparison, if the relative value of the talk channel use rate of the requested frequency is larger than the initial threshold, the frequency band having the minimum talk channel use rate is selected, and the call channels that are not in the call are selected from the talk channels of the selected frequency. A third step (S83-S86) of allocating a corresponding call resource to a terminal requesting a call and increasing the number of call channels by a predetermined value; A fourth step (S87) of transmitting the information of the call resource of the selected frequency to the corresponding terminal after the second and third steps; When the call is terminated after the fourth step, a fifth step (S88-S90) is performed to release the call resource of the corresponding frequency and reduce the number of the call channels that have been called at the selected frequency by the increased predetermined value.

In the sixth embodiment of the channel allocation method according to the present invention made as described above, first, an initial threshold value for frequency allocation of the minimum call resource use ratio is set in the base station (S74). Thereafter, the terminal transmits its own list of frequencies to the terminal (S75), and the terminal receiving the frequency list adjusts its channel frequency to the frequency selected by its hash function among the frequency lists, and adjusts the channel frequency. The call is requested at the frequency (S76-S77).

The base station that is requested to allocate the call resource from the terminal compares the call channel use rate relative value of the requested frequency with the initially set threshold (S78 to S79), and then uses the call channel use rate relative value of the requested frequency. If it is less than the initial threshold, the terminal selects a frequency requested by the terminal, and allocates a call resource in a non-call state among call resources of the selected frequency (S80 to S81). The number of used communication channels of the selected frequency is increased by one (S82).

The relative value of the use rate of the call channel of the requested frequency is calculated by subtracting the use rate of the call channel of the frequency maintaining the minimum call use rate from the call channel use rate of the corresponding frequency.

In addition, when the relative value of the talk channel use ratio of the requested frequency is larger than the initial threshold value, the talk channel usage ratio between the frequencies is compared (S83), and then the frequency having the minimum number of talk channel usage is selected (S84). ). Thereafter, the call resources of the selected call frequency in the non-call state are allocated (S85), and the number of used call channels of the selected frequency is increased by one (S86).

After the step S82 or step S86, information on the selected frequency and communication channel is transmitted to the terminal (S87). The terminal receiving the information readjusts the channel frequency to the received frequency and then makes a call to the assigned call channel (S88).

Thereafter, the base station checks whether the terminal terminates the call and when the terminal terminates the call (S89), releases the call resource of the corresponding frequency, decreases the number of call channels by 1 and terminates the channel allocation process (S90).

As described above, the present invention, by inducing the call of the terminal to the appropriate frequency band in the base station system for the call required from the terminal, the effect of optimizing the load sharing of the base station system and the propagation environment between the base station and the terminal There is.

In addition, the load sharing of the base station system and the optimization of the propagation environment between the base station and the terminal to improve the performance of the base station system, there is an advantage to improve the call quality of the channel in the call.

Claims (9)

In the channel allocation method of the CDMA system The base station transmits a frequency list of the base station to the terminal, and selects a frequency band having the smallest number of talk channels allocated for the call of other terminals among the resources of each frequency if a call request exists at the adjusted frequency from the terminal. Step 1; A second step of selecting a call channel that is not in a call among the call channels of the selected frequency and allocating a corresponding call resource to the requesting terminal; A third step of increasing the number of call channels allocated to the terminal by a predetermined value and transmitting information on the call resource of the selected frequency to the corresponding terminal; And a fourth step of releasing a call resource of a corresponding frequency when the call of the terminal is terminated after the third step and reducing the number of call channels talked to the selected frequency by the increased predetermined value. Channel allocation method in a split multiple access system. In the channel allocation method of the CDMA system, Transmitting a frequency list owned by the base station to the terminal, and selecting a frequency band having a minimum call channel usage rate among resources of each frequency if a call request exists at the adjusted frequency from the terminal; A second step of selecting a call channel that is not in a call among the call channels of the selected frequency and allocating a corresponding call resource to the requesting terminal; A third step of increasing the number of call channels allocated to the terminal by a predetermined value and transmitting information on the call resource of the selected frequency to the corresponding terminal; And a fourth step of releasing a call resource of a corresponding frequency when the call is terminated after the third step, and reducing the number of call channels talked to the selected frequency by the increased predetermined value. Channel allocation method of access system. The method of claim 2, wherein the call channel usage rate, (Number of talk channels in the frequency / number of talk channels available in the frequency) * Channel allocation method of a code division multiple access system, characterized in that calculated by 100 (%). In the channel allocation method of the CDMA system, After setting an initial threshold for allocating the minimum call resource use frequency, the base station transmits a list of frequencies owned by the base station, and if there is a call request with the adjusted frequency from the terminal, the number of call channels of the requested frequency and the set initial threshold Comparing the first step with; A second step of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal if the number of call channels of the requested frequency is smaller than the initial threshold as a result of the comparison; If the number of communication channels of the requested frequency is greater than the initial threshold as a result of the comparison, the terminal requesting a call by selecting a frequency band of the minimum calling channel and selecting a non-calling communication channel among the communication channels of the selected frequency. A third step of allocating the corresponding call resource to the controller and increasing the number of call channels by a predetermined value; A fourth step of transmitting information of a call resource of the selected frequency to the corresponding terminal after the second and third steps; And a fifth step of releasing the call resource of the corresponding frequency when the call is terminated after the fourth step and reducing the number of the call channels talked to the selected frequency by the increased predetermined value. Channel allocation method of access system. In the channel allocation method of the CDMA system, After setting an initial threshold for frequency allocation of the minimum call resource use rate, the base station transmits a list of frequencies owned by the base station, and if a call request exists at the adjusted frequency from the terminal, the call channel use rate and the set frequency of the requested frequency are set. A first step of comparing the initial thresholds; A second step of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal if the rate of use of the call channel of the requested frequency is less than the initial threshold; As a result of the comparison, if the call channel usage rate of the requested frequency is greater than the initial threshold, select a frequency band having the minimum call channel usage rate, and select a call channel that is not in a call among the call channels of the selected frequency to make a call. A third step of allocating a corresponding call resource to the requesting terminal and increasing the number of call channels by a predetermined value; A fourth step of transmitting information of a call resource of the selected frequency to the corresponding terminal after the second and third steps; And a fifth step of releasing the call resource of the corresponding frequency when the call is terminated after the fourth step and reducing the number of the call channels talked to the selected frequency by the increased predetermined value. Channel allocation method of access system. In the channel allocation method of the CDMA system, After setting an initial threshold for allocating the minimum call resource use frequency, the base station transmits a list of frequencies owned by the base station, and if a call request exists at the adjusted frequency from the terminal, A first step of comparing the initial thresholds; A second step of allocating a call resource of a requested frequency and increasing the number of call channels allocated to the terminal when the relative value of the number of use of talk channels at the requested frequency is less than the initial threshold value; As a result of the comparison, if the relative number of call channel usage of the requested frequency is larger than the initial threshold, a frequency band having the minimum number of call channel usage is selected, and a call channel that is not in a call is selected among the call channels of the selected frequency. A third step of allocating a corresponding call resource to a terminal requesting a call and increasing the number of call channels by a predetermined value; A fourth step of transmitting information of a call resource of the selected frequency to the corresponding terminal after the second and third steps; And a fifth step of releasing the call resource of the corresponding frequency when the call is terminated after the fourth step and reducing the number of the call channels talked to the selected frequency by the increased predetermined value. Channel allocation method of access system. The method of claim 6, wherein the use number relative value of the call channel is A channel allocation method of a code division multiple access system, comprising calculating by subtracting the number of talk channels on a frequency maintaining a minimum call from the number of talk channels on a corresponding frequency. In the channel allocation method of the CDMA system, After setting an initial threshold for allocating the minimum call resource use frequency, the base station transmits a list of frequencies owned by the base station, and if a call request exists at the adjusted frequency from the terminal, A first step of comparing the initial thresholds; A second step of allocating a call resource of the requested frequency and increasing the number of call channels allocated to the terminal if the relative value of the call channel usage ratio of the requested frequency is less than the initial threshold; As a result of the comparison, if the relative value of the talk channel use rate of the requested frequency is larger than the initial threshold, the frequency band having the minimum talk channel use rate is selected, and the call channels that are not in the call are selected from the talk channels of the selected frequency. A third step of allocating a corresponding call resource to a terminal requesting a call and increasing the number of call channels by a predetermined value; A fourth step of transmitting information of a call resource of the selected frequency to the corresponding terminal after the second and third steps; And a fifth step of releasing the call resource of the corresponding frequency when the call is terminated after the fourth step and reducing the number of the call channels talked to the selected frequency by the increased predetermined value. Channel allocation method of access system. The method of claim 8, wherein the use rate relative value of the call channel is calculated by subtracting the use rate of the call channel of the frequency maintaining the minimum call use rate from the call channel use rate of the corresponding frequency. Channel allocation method in code division multiple access system.