KR100584281B1 - System and Method for Assigning Channel - Google Patents

Abstract

According to an aspect of the present invention, there is provided a communication apparatus comprising: a call processor configured to set a FA having a minimum RSSI value among at least one FA as a call channel when a call channel setting request command transmitted from a terminal is received; A modem card for performing modulation and demodulation of a signal to be transmitted and received; A transmitter configured to up-convert the signal transmitted from the modem card and transmit the signal to the terminal through an antenna; and a receiver which down-converts the signal received through the antenna and measures an RSSI value for each FA for the down-converted signal. In addition, the increase in the capacity of the base station can be maximized by minimizing the influence of mutual interference caused by a plurality of FA signals.

Channel assignment, RSSI

Description

System and Method for Assigning Channel             

1 is a block diagram schematically showing the configuration of a conventional base station.

2 is a flow diagram illustrating a method for establishing a conventional call channel.

Figure 3 is a block diagram schematically showing the configuration of a base station according to an embodiment of the present invention.

4 is a flowchart illustrating a method for establishing a call channel according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a method for establishing a call channel according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100, 300: call processor 104, 304: call processing unit

108, 308: resource manager 114, 314: modulator

118, 318: demodulator 130, 330: transmitter

132, 332: link interface unit 134, 334: DAC

136, 336: frequency down converter 138, 338: power amplifier

140, 340: receiver 142, 342: low noise amplifier

144, 344: frequency up-conversion unit 146, 346: ADC

148, 348: link interface unit 347: RSSI detection unit

The present invention relates to a channel allocation method for allocating a channel in consideration of a channel load allocated to each FA among available frequency resources when establishing a call channel with a terminal in a base station of a mobile communication system operating a plurality of frequency allocations. And to the system.

We use wireless-related terminals in our daily lives, such as cordless phones, cell phones and walkie-talkies. This wireless terminal is not used alone, but there must be a wireless system that carries a wireless signal.

In general, wireless systems have been used solely in areas that cannot be accommodated, or to compensate for the shortcomings of wired systems and for emergency recovery in case of disaster.

In other words, while installing a wireless system in an area or island where it is difficult to install a cable, various types of wireless terminals are used due to the convenience of wireless, and the wireless system used is fixedly installed in a high building or a mountain due to the characteristics of wireless.

Hereinafter, a base station used in a wireless communication system will be described with reference to the accompanying drawings.

1 is a block diagram schematically showing the configuration of a conventional base station.

Referring to FIG. 1, a base station includes a call processor 100, a modem card 110, and a transceiver 120.

The call processor 100 controls a transmission / reception signal between a base station and a terminal, and performs a call setup procedure when a call channel setup request command of a terminal and a call channel setup request command from a higher network are received.

That is, the call processor 100 controls the transmission frequency of the transmission and reception unit to the terminal by allocating resources for the call channel to the call establishment request of the terminal. In this case, the MAC index resource includes a MAC index, and in the case of an IS-95 CDMA system, 64 MAC indexes exist per FA. The 64 MAC indexes consist of a pilot channel, a sync channel, a paging channel, and a traffic channel.

The terminal transmits a call channel assignment complete message to the base station by using the resource information including the MAC index. After the call channel setup is completed, call setup is completed through the same process as the network connection setup with the upper network and authentication of the terminal.

The call processor 100 as described above includes a call processing unit 104 and a resource management unit 108.

The call processing unit 104 is in charge of interworking with the higher processor and call processing in the base station.

The resource manager 108 manages call resources in the base station. When the call channel setting request command is received from the call processor 104, the resource manager 108 extracts a MAC index for an available call channel and includes the extracted MAC index. Assigns the FA to the call channel. Here, the call resource includes a radio resource for establishing a link with a terminal including a MAC index and a network resource for establishing a link with a higher network.

The call processor 100 receives information and control of available resources from the resource manager 108 for channel and FA allocation for the call channel setting request command transmitted from the terminal, and the resource manager 108 manages Among the MAC indexes, the available MAC index is allocated to the call channel establishment request command of the call processor. At this time, the resource manager 108 manages the MAC index for each FA.

The modem card 110 includes a modulator 114 for coding and modulating data and a demodulator 118 for demodulating and decoding a received signal.

The transmitter / receiver 120 up-converts the frequency of the signal modulated by the modem card 110, transmits the signal to the terminal 130 through the antenna, amplifies the signal transmitted from the antenna, and then amplifies the frequency down. It includes a receiver 140 for converting and transmitting to the modem card (110).

The transmitter 130 includes a link interface unit 132, a DAC 134, a frequency up converter 136, and a power amplifier 138.

The link interface unit 132 transmits a signal transmitted from the modulator 114 to the DAC 134.

The DAC 134 converts a digital signal transmitted from the link interface unit 132 into an analog form and transmits the analog signal to the frequency up-conversion unit 136.

The frequency up-converter 136 converts an analog IF signal transmitted from the DAC 134 into an RF signal and transmits the RF signal to the power amplifier 138.

The power amplifier 138 amplifies the RF signal of the analog form transmitted from the frequency up-converter 136 to a large power and transmits it to the terminal through an antenna.

The receiver 140 includes a low noise amplifier 142, a frequency down converter 144, an ADC 146, and a link interface 148.

The low noise amplifier 142 low noise amplifies an analog signal received through an antenna and transmits the signal to the frequency down converter 144.

The frequency down converter 144 converts an analog RF signal transmitted from the low noise amplifier 142 into an IF signal and transmits the converted RF signal to the ADC 146.

The ADC 146 converts an analog IF signal transmitted from the frequency down converter 144 into a digital signal and transmits it to the link interface unit 148.

The link interface unit 148 transmits a digital signal transmitted from the ADC 146 to a demodulator.

Hereinafter, the operation of the base station configured as described above will be described.

When the terminal transmits a channel setup request command to the base station, the call processing unit 104 of the base station transmits a channel setup request command to the resource manager 108 to allocate a frequency according to the channel setup request command. Then, the resource management unit 108 determines whether there is an available MAC index, and allocates the MAC index if the available MAC index exists.

Then, the call processor 104 transmits a transmission signal to the modulator 114 using the assigned MAC index. The modulator 114 modulates the transmitted signal and transmits the modulated signal to the DAC 134 through the link interface unit 132.

The DAC 134 converts the transmitted digital transmission signal into an analog transmission signal and transmits it to the frequency up-conversion unit 136. The frequency up-converter 136 converts the transmitted analog IF signal into an RF signal and transmits the converted RF signal to the power amplifier 138. The power amplifier 138 amplifies the transmitted RF signal and transmits the RF signal to a corresponding terminal through an antenna.

The terminal obtains frequency information for setting a call channel from paging channel information received from the base station, and converts the frequency information to an RF frequency according to the frequency information and transmits the frequency information to the base station.

The base station low-noise amplifies a plurality of FA signals according to the number of operating FA resources and talk channels of the transmitted base station and transmits the same to the frequency down converter 144. The frequency down converter 144 converts the plurality of FA signals into IF signals and transmits them to the ADC 146. The ADC 146 converts the transmitted analog IF signal into a digital form and transmits it to the demodulator 118 through the link interface unit 148.

The demodulator 118 demodulates the transmitted signal and transmits the demodulated signal to the call processor 100.

2 is a flowchart illustrating a method of setting up a conventional call channel.

Referring to FIG. 2, when the terminal transmits a call channel setup request command to the base station (S200), the base station receives a call channel setup request command (S202), and extracts a MAC index available for establishing a call channel. Assign (S204).

That is, the base station determines whether there is a MAC index available for establishing a call channel. If there is a usable MAC index, the base station allocates the available MAC index in sequence.

Then, the base station transmits the resource information including the assigned MAC index to the terminal (S206).

After receiving the resource information transmitted from the base station (S208), the terminal transmits a call channel setting completion message to the base station using the received resource information (S210).

The base station receives a call channel setting completion message transmitted from the terminal (S212). Then, a communication channel is established between the terminal and the base station.

However, in order to establish a communication channel between a terminal and a base station due to a service request of a terminal or a request from a higher network to the terminal, the MAC index managed by the resource management unit is required. The allocation of the index is randomly assigned without considering the current channel and FA allocation information and the cell environment in the service area.In the case of the base station receiver, the FA signal of high reception power affects the FA of low signal by the difference of reception level between FAs. There is a problem going crazy.

In addition, since a receiving unit having a structure for receiving a plurality of FAs in a single path has a plurality of FAs having the same amplification gain through the same receiving path, there is a problem in that the influence due to mutual interference is further increased.

In addition, in case of ADC, if multiple signals with large power difference are applied at the same time, it will lead to increase of ADC's conversion error. There is a problem.

In addition, if the transmission power of a particular FA is radiated relatively high according to the channel allocation difference between FAs, it causes unnecessary interference to adjacent cells or sectors, which leads to a decrease in overall cell capacity of the base station.

Accordingly, an object of the present invention is to provide a channel allocation method and system capable of maximizing capacity increase of a base station by minimizing the effects of mutual interference caused by a plurality of FA signals.

According to an aspect of the present invention to achieve the above object, in a mobile communication terminal system including one or more base stations operating one or more FA, when a call channel setting request command transmitted from the terminal is received, A call processor for setting a FA having a minimum RSSI value as a call channel; A modem card for performing modulation and demodulation of a signal to be transmitted and received; A transmitter configured to up-convert the signal transmitted from the modem card and transmit the signal to the terminal through an antenna; and a receiver configured to down-convert the signal received through the antenna and to measure an RSSI value for each FA of the down-converted signal. Provided is a channel allocation system, characterized in that.
The call processor includes a call processing unit which receives a call channel setting request command from a terminal and processes a call; When a call channel setting request command is received from the call processing unit, a resource management unit for comparing the RSSI value of each FA to extract the minimum MAC index, and assigning the FA including the extracted MAC index to the call channel Include.

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The resource manager manages the MAC index for each FA.

The receiver includes a low noise amplifier for low noise amplifying a signal received through an antenna, a frequency down converter for converting an analog RF signal transmitted from the low noise amplifier into an IF signal, and an analog form transmitted from the frequency down converter. An analog / digital converter converts an IF signal into a digital signal, and an RSSI detector for measuring RSSI values of respective FAs with respect to one or more FA signals transmitted from the analog / digital converter.

According to another aspect of the present invention, by down-converting one or more FA signals to an IF frequency, and then converting them into a digital signal, and measuring RSSI values of each FA with respect to the one or more FA signals converted into the digital shape, After storing, when a call channel setting request command is received from the terminal, the MAC index of which the RSSI value is minimum among the one or more FAs is extracted, and the FA including the extracted MAC index is set as a call channel. A channel allocation method is provided.

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

3 is a block diagram schematically illustrating a configuration of a base station according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the base station includes a call processor 300, a modem card 310, and a transceiver 320.

The call processor 300 controls a transmission / reception signal between the base station and the terminal, and performs a call setup procedure when a call channel setup request command of the terminal and a call channel setup request command from a higher network are received.

That is, the call processor 300 controls to set the transmission frequency of the transmission and reception unit to the terminal by allocating resources for the call channel to the call setup request of the terminal. In this case, the MAC index resource includes a MAC index, and in the case of an IS-95 CDMA system, 64 MAC indexes exist per FA. The 64 MAC indexes consist of a pilot channel, a sync channel, a paging channel, and a traffic channel.

The terminal transmits a call channel assignment complete message to the base station by using the resource information including the MAC index. After the call channel setup is completed, call setup is completed through the same process as the network connection setup with the upper network and authentication of the terminal.

The call processor 300 as described above includes a call processor 304 and a resource manager 308.

The call processing unit 304 is responsible for call processing interworking with the higher processor and call processing in the base station.

The resource manager 308 manages a call resource. When a call channel setting request command is received from the call processor 304, the resource manager 308 extracts a MAC index that minimizes the difference between RSSI (Received Signal Strength Indicator) values for each FA. The FA including the extracted MAC index is set as a call channel.

That is, the resource manager 308 compares the FAS RSSI values using the FAI RSSI values transmitted from the transceiver, and allocates the MAC index of the FA having the smallest RSSI value.

The modem card 310 includes a modulator 314 for coding and modulating data and a demodulator 318 for demodulating and decoding a received signal.

The transceiver 320 up-converts the frequency of the signal modulated by the modem card 310, transmits the signal to the terminal 330 for transmission to the terminal through an antenna, amplifies the signal transmitted from the antenna, and then lowers the frequency. It includes a receiver 340 for converting and transmitting to the modem card.

The transmitter 330 includes a link interface 332, a DAC 334, a frequency up-converter 336, and a power amplifier 338.

The link interface unit 332 transmits the signal transmitted from the modulator 314 to the DAC 334.

The DAC 334 converts a digital signal transmitted from the link interface unit 332 into an analog form and transmits the analog signal to the frequency up-conversion unit 336.

The frequency up-converter 336 converts the analog IF signal transmitted from the DAC 334 into an RF signal and transmits the converted RF signal to the power amplifier 338.

The power amplifier 338 amplifies the RF signal of the analog form transmitted from the frequency up-converter 336 to a large power and transmits it to the terminal through an antenna.

The receiver 340 includes a low noise amplifier 342, a frequency down converter 344, an ADC 346, an RSSI detector 347, and a link interface 348.

The low noise amplifier 342 low noise amplifies the signal received through the antenna and transmits the signal to the frequency down converter 344.

The frequency down converter 344 converts an analog RF signal transmitted from the low noise amplifier 342 into an IF signal and transmits the converted RF signal to the ADC 346.

The ADC 346 converts an analog IF signal transmitted from the frequency down converter 344 into a digital signal and transmits the digital signal to the RSSI detector 347.

The RSSI detector 347 measures RSSI values for one or more FA signals transmitted from the ADC 346 and transmits the RSSI values to the resource manager 347.

The link interface unit 348 transmits the digital IF signal transmitted from the RSSI detector 347 to the demodulator 318.

Hereinafter, the operation of the base station configured as described above will be described.

When the terminal transmits a call channel setting request command to the base station, the call processing unit 304 of the base station transmits a call channel setting request command to the resource management unit to allocate a frequency according to the call channel setting request command.

Then, the resource manager 308 extracts the MAC index that the difference between the RSSI values for each FA measured and stored by the RSSI detector 347 is minimum, and then assigns the FA including the extracted MAC index to the call channel. Then, the call processor 304 transmits a transmission signal to the modulator 314 using the assigned MAC index.

The modulator 314 modulates the transmitted signal and transmits the modulated signal to the DAC 334 through the link interface 332. The DAC 334 converts the transmitted digital transmission signal into an analog transmission signal and transmits it to the frequency up-conversion unit 336. The frequency up-converter 336 converts the transmitted analog IF signal into an RF signal and transmits the converted RF signal to the power amplifier 338.

The power amplifying unit 338 amplifies the transmitted RF signal and transmits the amplified RF signal to a corresponding terminal through an antenna. The terminal obtains frequency information for setting a call channel from paging channel information received from the base station, and converts the frequency information to an RF frequency according to the frequency information and transmits the frequency information to the base station.

The base station low-noise amplifies a plurality of FA signals according to the operating FA resources and the number of communication channels of the base station and transmits them to the frequency down converter 344. The frequency down converter 344 converts a plurality of FA signals into IF signals and transmits them to the ADC 346. The ADC 346 converts the transmitted analog IF signals into digital forms and performs an RSSI detection unit ( 347).

The RSSI detector 347 measures RSSI values for the plurality of FA signals transmitted from the ADC 346 and transmits the RSSI values to the resource manager 308. The resource manager 308 allocates an FA for call channel setting using the RSSI value for each FA transmitted from the RSSI detector 347 and transmits the FA to the call processor 304.

In addition, the RSSI detector 347 transmits a plurality of FA signals transmitted from the ADC 346 to a demodulator 318, and the demodulator 318 demodulates the plurality of transmitted FA signals by a call processor. Send to 300.

4 is a flowchart illustrating a method for establishing a call channel according to an exemplary embodiment of the present invention.

Referring to FIG. 4, when a terminal transmits a call channel setting request command to a base station (S400), the base station receives a call channel setting request command (S402), and the FA is stored in a resource manager to set a call channel. The MAC index with the smallest difference between the RSSI values is extracted (S404). Then, the base station transmits the resource information including the extracted MAC index to the terminal (S406).

After receiving the resource information transmitted from the base station (S408), the terminal transmits a call channel setting completion message to the base station using the received resource information (S410).

When the base station receives the call channel setting completion message transmitted from the terminal (S412), the call channel setting between the base station and the terminal is completed.

5 is a flowchart illustrating a method for establishing a call channel according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the base station down-converts a plurality of FA signals in analog form transmitted from a currently operating terminal to an IF frequency and then converts them into digital signals (S500).

Then, the base station measures RSSI values for the plurality of FA signals converted into the digital form and stores them in the resource management unit (S502).

Then, the base station determines whether a call channel setting request command is received from a higher network (S504). As a result of the determination in step 504, when a call channel setting request command is received from a higher network, the base station extracts a MAC index for minimizing the difference of RSSI values for each FA stored in the resource manager (S506), and includes the extracted MAC index. The FA is set to the call channel and the call channel resource information is transmitted to the terminal using the paging channel (S508).

After receiving the call channel resource information, the terminal sets a call channel using the call channel resource information and transmits a call channel setting completion message to the base station. Then, the base station receives a call channel setting completion message transmitted from the terminal (S510).

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, according to the present invention, it is possible to provide a channel allocation method and system capable of maximizing capacity increase of a base station by minimizing the influence of mutual interference caused by a plurality of FA signals.

In addition, according to the present invention, it is possible to improve the performance of the base station receiver by reducing the occurrence of an error when the low-power FA signal is changed to a digital signal in the ADC converting a plurality of analog FA signals into digital signals It is possible to provide a channel allocation method and system.

Claims (5)

In the mobile communication terminal system including at least one base station for operating one or more FA, A call processor for setting a FA having a minimum RSSI value among at least one FA as a call channel when a call channel setting request command transmitted from the terminal is received; A modem card for performing modulation and demodulation of a signal to be transmitted and received; Transmitter for up-converting the signal transmitted from the modem card to transmit to the terminal through the antenna; And Receiving unit for down-converting the signal received through the antenna, and measuring the RSSI value for each FA for the down-converted signal Channel allocation system comprising a. The method of claim 1, The call processor includes a call processing unit which receives a call channel setting request command from a terminal and processes a call; When a call channel setting request command is received from the call processing unit, a resource management unit for comparing the RSSI value of each FA to extract the minimum MAC index, and assigning the FA including the extracted MAC index to the call channel And a channel assignment system. The method of claim 2, And the resource manager manages a MAC index for each FA. The method of claim 1, The receiver includes a low noise amplifier for low noise amplifying the signal received through the antenna; A frequency down converter configured to convert an analog RF signal transmitted from the low noise amplifier into an IF signal; An analog / digital converter for converting an analog IF signal transmitted from the frequency down converter into a digital signal; And an RSSI detector for measuring RSSI values of respective FAs with respect to at least one FA signal transmitted from the analog / digital converter. Down converting the one or more FA signals to an IF frequency and then converting the signals into digital signals; Measuring and storing RSSI values for each FA of the one or more FA signals converted into the digital form; When the call channel setting request command is received from the terminal, extracting a MAC index of which RSSI value of the one or more FAs is minimum; and Setting an FA including the extracted MAC index as a call channel Channel allocation method comprising a.

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