KR20010028471A - Method for call restruction using tx power of base station in mobile communication system - Google Patents

Abstract

PURPOSE: A method for controlling calls using a transmission output of a base station in a mobile communication system is provided to monitor a transmission output value according to steps, and to control the calls according to steps, if the transmission output value is over a threshold, so as to prevent an increase of the transmission output value. CONSTITUTION: A base station wireless output detector(102) checks whether a base station transmission power is capable of being measured. If not, a base station call processor inputs a TCE(Traffic Channel Element) digital gain from a TCE controller and calculates a base station transmission output value. The base station wireless output detector(102) compares the base station transmission output value with a maximum amount permissible threshold. If the transmission output value of the existing base station is over the maximum amount permissible threshold, a base station call processor(104) controls a new call and a hand-off call. If the transmission output value is below the maximum amount permissible threshold, the base station wireless output detector(102) checks whether the transmission output value is over a new call control threshold. If not, the base station call processor(104) normally processes a call. If the transmission value is over the new call control threshold, the base station wireless output detector(102) checks whether the transmission output value is below a hand-off call control threshold. If not, the base station call processor(104) controls the new call and the hand-off call. If the transmission output value is below the hand-off call control threshold, the base station call processor(104) controls the new call.

Description

Call limiting method using transmission output of base station in mobile communication system {METHOD FOR CALL RESTRUCTION USING TX POWER OF BASE STATION IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a call control method of a mobile communication system, and more particularly, to a call control method according to a transmission output of a base station.

In the mobile communication system, the transmission output of the base station is the transmission output of each overhead channel (e.g., pilot, sync, paging channel) and the transmission of traffic channels. Determined by output In general, since the digital gain of the overhead channel of the base station system is constant, the output of the overhead channel is constantly fixed at all base stations. However, since the output of the traffic channel is varied by the power control between the base station and the mobile station, the mobile station does not have a constant output for one call. That is, the transmission output of the base station is continuously changed by various factors such as the currently set call and hand-off call (location), the position between each mobile station and the base station, environmental conditions, and the like.

On the other hand, when an excessive number of calls temporarily occur in a specific base station or when the base station increases transmission power by power control, an RF element related to signal transmission, for example, a high power amplifier, a transceiver, a transmission path Excessive output from a filter (TX Path Filter) can damage the device. In addition, damage to the device may cause the transmission path of the base station not to operate normally, resulting in a decrease in transmission output. As a result of this, damage to the device may interrupt not only the existing call but also the entire call service of the base station.

On the other hand, conventionally, when a mobile station requests a base station to set up a call or when a base station allocates a call to a mobile station, the base station is provided if there is a traffic channel resource and the channel state is normal and the transmission path to the neighboring base station is normal. The call processing block included in the allocated a traffic channel for the call. In addition, when there is no traffic channel resource available for a specific subcell such as FA (Frequency Assignment), the base station performs handoff and allocates a traffic channel of another subcell. That is, when a traffic channel is allocated to a new call or a handoff call, the call processing block provided in the base station has conventionally allocated a call corresponding to the available traffic channel resources.

Therefore, in the case of busy time, if a large number of call setups occur temporarily within a specific base station jurisdiction or a subcell, the number of allocated traffic channels increases. In addition, a call assigned to a specific subcell may increase the transmission power of all base stations under power control. Also, even when base station call services are concentrated only in a specific subcell due to abnormal operation of a neighboring subcell, the transmission power of all base stations may be increased. You can increase it. In addition, by causing various increase in base station transmit power, devices related to the base station transmit power may be damaged.

As described above, in the case of the transmission output exceeding the maximum capacity in which the corresponding device related to the transmission output can normally operate, the corresponding device stops itself due to capacity saturation. Therefore, until the base station operates normally again, the base station cannot perform the necessary transmission output, and all calls allocated to the corresponding subcells such as sectors and FAs of the suspended device are forcibly released. Therefore, in order to prevent the operation interruption of the corresponding device due to the increase in the transmission power of the base station, the call should be limited before the maximum capacity of the device capable of normal service.

Accordingly, an object of the present invention is to monitor the transmission output of a base station in a mobile communication system step by step, and if the transmission output of the base station is greater than the threshold of the corresponding step to limit the call step by step accordingly to prevent the increase of the transmission output of the base station In providing a method.

Another object of the present invention is to monitor the transmission output of the base station in a mobile communication system divided into a threshold for limiting a new call and a threshold for limiting a handoff call, and if the transmission power of the base station is greater than the threshold of the step, accordingly The present invention provides a method of preventing an increase in transmission power of a base station by restricting a new call or restricting a handoff call or restricting a new call and a handoff call.

Another object of the present invention is to prevent an increase in the transmit power of the base station by limiting the new call and the handoff call if the transmit power of the base station is larger than the maximum capacity allowance threshold corresponding to the maximum capacity of the transmission related device in the mobile communication system. In providing a method.

According to an aspect of the present invention, a call limiting method using a transmit power of a base station in a mobile communication system includes a first step of processing a call normally when the measured output power of the base station is smaller than a new call limit threshold; A second step of limiting the new call if the transmit power of the received base station is greater than the new call limit threshold and less than the handoff call limit threshold; and a new call if the measured output of the base station is greater than the handoff call limit threshold. And a third step of limiting the handoff call.

1A illustrates a call restriction procedure using a transmission output of a base station according to an embodiment of the present invention in a mobile communication system.

1B illustrates a call restriction procedure using a transmission output of a base station according to an embodiment of the present invention in a mobile communication system.

2 is a diagram illustrating a transmission output calculation procedure of a base station according to an embodiment of the present invention in a mobile communication system.

3 is a flowchart illustrating a method of limiting transmission power of a base station according to an embodiment of the present invention in a mobile communication system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of related well-known functions or configurations are omitted when it is determined that the detailed description may unnecessarily obscure the subject matter of the present invention.

In order to prevent damage to a device related to signal transmission due to an increase in the transmission power of the base station in the present invention, the base station radio power measurement unit monitors the transmission power of the base station using measurement equipment. When the transmission output of the base station exceeds the normal operating range of the signal transmission-related device, the base station call processing unit reports it. The base station call processing unit limits the new call or the handoff call.

In addition, in the embodiment of the present invention, the normal operation range of the signal transmission related device may be divided into a range limiting a new call and a range limiting a handoff call. That is, the base station call processing section not only limits the new call but also limits the call being handed off if the base station transmission output is greater than or equal to the threshold limiting the handoff call. The base station call processing section limits the new call only if the base station transmit power is below the threshold limiting the handoff call and above the threshold limiting the new call. The base station call processing unit performs a service for a call handed off with a new call when the base station transmission power is less than or equal to a threshold limiting the new call. In addition, when a call is restricted in a specific cell or subcell, if a handoff occurs to another cell or another subcell, this causes a decrease in the base station transmission power and thus does not limit the handoff call. The threshold for limiting the new call and the threshold for limiting the handoff call may be varied according to the channel environment of a specific base station cell.

In the embodiment of the present invention, the normal operation range of the signal transmission-related device is divided into a range limiting a new call and a range limiting a handoff call as described above, which is to maximize the capacity and performance of the system. That is, even if the transmission output of the base station exceeds the first normal operation threshold (new call limit threshold), the embodiment of the present invention has a certain buffer range, that is, up to the second normal operation threshold (handoff call limit threshold). Allow handoff call restrictions. In particular, even if the base station transmission power for a particular subcell is increased, other subcells can service the new call by handoff.

In addition, the maximum capacity allowable threshold according to the embodiment of the present invention is a threshold corresponding to the maximum capacity of the signal transmission-related device capable of normal service by the base station, and is fixed according to its own characteristics. The base station call processing unit limits the new call and the handoff call if the base station transmit power allows the maximum capacity allowable threshold, thereby preventing further increase in base station transmit power. Further, the maximum capacity allowable threshold may be set by a manufacturer of a signal transmission related device, and the threshold limiting the handoff may be up to the maximum capacity allowable threshold. In addition, in the embodiment of the present invention, the call limiting operation by the maximum capacity allowable threshold may be performed independently of the call limiting operation by the new call limiting threshold and the handoff call limiting threshold. That is, even when the mobile communication network operator does not set the call limit operation mode based on the new call limit threshold and the handoff call limit threshold, the call limit operation based on the maximum capacity allowed threshold should be performed.

In addition, when the base station radio power measurement equipment is not provided or when the base station radio power measurement equipment does not operate normally, the current base station transmission power is not directly measured. At this time, in the embodiment of the present invention, the transmission output can be calculated based on the statistical data. That is, the transmission output of the base station is determined by the overhead channel power and the traffic channel power. And since the digital gain of each base station overhead channel is constant, the transmission output of the overhead channel is fixed at all base stations. In addition, the transmission output of the traffic channel can be calculated by obtaining the traffic channel variable factor for all calls currently configured. That is, the embodiment of the present invention calculates the traffic channel transmission output value for each call from the digital gain value of the assigned traffic channel. The embodiment of the present invention calculates the traffic channel transmission output values of all the calls allocated to the entire base station by adding the traffic channel transmission output values for each call. According to an embodiment of the present invention, the base station overhead transmission output value is added to the traffic channel transmission output values of all calls allocated to the base station, and the current base station transmission output value is calculated. The traffic channel digital gain value for each call currently set can be calculated and generally obtained by a traffic channel element control unit.

For example, the base station overhead transmission output value can be obtained by Equation 1 below.

Here, 127 denotes an example of the maximum range of the set channel element digital gain, and A denotes a base station transmission output value when only a pilot channel signal is output from the base station when the pilot channel digital gain is 127. The pilot DG denotes a digital gain of a pilot channel, the Sync DG denotes a digital gain of a synchronization channel, the paging n DG denotes a digital gain of n paging channels, and n is the number of paging channels. The paging rate means a transmission rate of a paging channel signal. At this time, the paging rate may be 4800bps or 9600bps.

For example, the traffic channel transmission output value for each call can be obtained from Equation 2 below.

Where Is a traffic channel transmission output value for each call, the Traffic Channel Digital Gain is a traffic channel digital gain, 127 is an example of the maximum range of the set channel element digital gain, and A is When the pilot channel digital gain is 127, only a pilot channel signal means a base station transmission output value when the base station outputs the voice signal, and the voice activity means a voice activity. In this case, the voice activity may be 0.55, which is an average value according to a call pattern of the user.

For example, the current base station transmission output value can be obtained by the following <Equation 3>.

Where Denotes the current base station transmission output value, and Denotes the base station overhead transmission output value, and Denotes a traffic channel transmission output value of all calls allocated to the entire base station.

1A illustrates a call restriction procedure using a transmission output of a base station according to an embodiment of the present invention in a mobile communication system.

The base station radio power measurement unit 102 periodically measures the base station transmission power (11a). In this case, the measurement period may be a minimum time when the base station wireless output measurement block can operate normally. In step 12a, the base station radio power measurement unit 102 checks the call restriction step according to the measured base station transmission power. That is, the base station radio power measurement unit 102 determines the call restriction step by comparing the measured base station transmission power with the step-by-step call limit threshold.

At this time, when the measured base station transmission power is less than the new call limit threshold, the base station radio power measurement unit 102 requests the base station call processing unit 104 to perform a normal call processing (13a).

And if the measured base station transmission power is greater than or equal to the call limit threshold and less than or equal to the handoff call limit threshold, base station radio power measurement unit 102 requests base station call processing unit 104 to limit the allocation of new calls (13a). do.

If the measured base station transmit power is greater than or equal to the handoff call limit threshold, the base station radio power measurement unit 102 requests the base station call processing unit 104 to limit the allocation of the new call and the allocation of the handoff call ( 13a).

The base station call processing unit 104 limits the call corresponding to the request of the base station radio output unit 102. (14a)

1B is a diagram illustrating a call restriction procedure using a transmission output of a base station according to an embodiment of the present invention in a mobile communication system.

The base station radio power measurement unit 102 periodically measures the base station transmission power (11b). In this case, the measurement period may be a minimum time when the base station wireless output measurement block can operate normally. In reference numeral 12b, the base station radio power measurement unit 102 determines the call restriction according to the measured base station transmission power. That is, the base station radio power measurement unit 102 compares the measured base station transmission power with the maximum capacity allowable threshold, and determines whether or not the call is restricted.

If the base station transmit power allows the maximum capacity allowable threshold, the base station radio power measurement unit 102 requests a new call and handoff call restriction to the base station call processing unit 104 (13b). The base station call processing unit 104 limits the call corresponding to the request of the base station radio output unit 102. (14b)

2 is a diagram illustrating a transmission output calculation procedure of a base station according to an embodiment of the present invention in a mobile communication system.

When the base station radio power measurement equipment is not provided or when the base station radio power measurement equipment does not operate normally, the base station call processing unit 202 calculates the base station overhead transmission power value (210) and the base station call processing unit 202. The TCE (Traffic Channel Element) control unit 204 requests 220 the digital gain of each traffic channel. The TCE control unit 204 calculates a digital gain for the currently allocated traffic channel element (230) and reports the calculated TCE digital gain to the TCE control unit 204 (240).

The base station call processing unit 202 calculates the traffic channel transmission output value for each call (250). The base station call processing unit 202 adds the traffic channel transmission output value for each call to determine the total number of all calls allocated to the base station. A traffic channel transmission output value is calculated, and the base station overhead transmission output value is added to the base station overhead transmission output value calculated in reference numeral 210 to calculate the current base station transmission output value. . (270)

3 is a flowchart illustrating a method of limiting transmission power of a base station according to an embodiment of the present invention in a mobile communication system. Hereinafter, a description will be given with reference to FIGS. 1 and 2.

In step 312, the base station wireless output measurement unit 102 checks whether the base station transmit power can be measured. In this case, the check may be determined depending on whether a polling message periodically reported from the base station radio power measurement equipment is received.

If the base station transmit power is not measurable, in step 314, the base station call processing unit 202 inputs a TCE digital gain from the TCE control unit 204 to calculate a base station transmission output value. In step 316, the base station radio power measurement unit 102 obtains the measured or calculated base station transmission output value and compares it with the maximum capacity allowance threshold. If the transmission power of the current base station is not equal to or less than the maximum capacity allowance threshold, the base station call processing unit 104 limits the new call and the handoff call in step 326.

If the transmission power of the current base station is less than or equal to the maximum capacity allowance threshold, in step 318, the base station wireless power measurement unit 102 checks whether the transmission power of the current base station is greater than or equal to the new call limit threshold. If the transmission power of the current base station is not greater than or equal to the new call limit threshold, the base station call processing unit 104 processes the call normally.

If the transmission power of the current base station is greater than or equal to the new call limit threshold, the base station call processing unit 102 again checks whether the transmission power of the current base station is less than or equal to the handoff call limit threshold. If the transmission power of the current base station is not less than the handoff call limit threshold, the base station call processing unit 104 performs the operation of step 326. If the transmission power of the current base station is less than the handoff call limit threshold in step 320, the base station call processing unit 104 limits the new call in step 324.

As described above, the present invention compares the transmission output of the base station with the step-by-step threshold in the mobile communication system and limits the corresponding call. As a result, an increase in base station transmission power is prevented, and there is an advantage in that damage to a signal transmission-related device can be prevented.

Claims (4)

In the call restriction method using the transmission output of the base station in the mobile communication system, A first step of normally processing a call if the measured transmission power of the base station is less than the new call limit threshold; If the measured transmission power of the base station is greater than the new call limit threshold and less than the handoff call limit threshold, a second step of limiting the new call; And a third step of limiting a new call and a handoff call if the measured transmission power of the base station is greater than the handoff call limit threshold. The method of claim 1, If the measured transmission power of the base station is larger than the maximum capacity allowance threshold corresponding to the maximum capacity of the signal transmission-related device, a fourth step of limiting the new call and the handoff call is further provided. Call limiting method using transmit power. 3. The method of claim 2, wherein the handoff call threshold is: Call limit method using the transmission output of the base station in the mobile communication system characterized in that up to the maximum capacity allowance threshold. 4. The method of claim 3, wherein if the base station transmit power cannot be measured, Calculating a traffic channel transmission output value for each call from the digital gain value of the assigned traffic channel; A second step of calculating traffic channel transmission output values of all calls allocated to the entire base station by adding traffic channel transmission output values for each call; Comprising a third step of adding the base station overhead transmission output value and the traffic channel transmission output value of all the calls allocated to the base station to calculate the base station transmission output, characterized in that the mobile communication system using the transmission output of the base station .