KR19990026195A - Dual band communication method and device - Google Patents

Abstract

The present invention implements a relay function with a 900MHz codeless telephone in a fixed wireless terminal device operating in the 2.3-2.4GHz band, and can also be used with a fixed wireless terminal device. A dual band communication method for providing mobility and an apparatus therefor.

That is, a fixed wireless terminal device installed indoors communicates with an external base station in a 2.3 to 2.4 GHz band, and a portable device having limited mobility with the fixed wireless terminal device communicates using a cordless telephone function of 900 MHz. This is a dual band communication method.

In addition, the apparatus for this purpose, the antenna 14 for transmitting and receiving data in the 2.3 ~ 2.4GHz broadband code division multiplex (CDMA) band between the fixed radio terminal device and the base station, and the base station and the two-way radio terminal device at the time of transmission and reception Transmitter and receiver 15 for providing a separate path, a transmitter 16 for processing the signal of the two-way radio terminal device and transmits the signal to the antenna 14 via the transceiver 15, and the antenna 14 A receiving unit 17 for receiving and processing a signal from the transmitting / receiving splitter 15 and up-converting the baseband signal at the transmitting and receiving unit into an RF signal, and converting the RF signal to a baseband. A local oscillator 18 for generating a frequency for downconversion to a signal, a D / A converter 19 for converting a digital signal to an analog signal, and an analog signal as a digital signal. A to convert A baseband processor 21, which is composed of a C / D converter 20 and a CDMA ASIC, performs CDMA digital signal processing such as modulation / modulation band spreading / despreading, interleaving and deinterleaving, channel encoding and decoding, and power control of a bidirectional signal. It consists of a CPU, a memory, etc., and it is composed of a control / connection unit 22 which controls the entire system, stores and communicates data, a vocoder and a codec, and is connected to a transmitter and a receiver. A voice coder 23 for processing a voice signal, a display device 24 such as an LCD for displaying various states of a fixed wireless terminal device, a keypad 25 for inputting an input, and a handset for receiving and transmitting voice ( An antenna 27 for transmitting and receiving a signal between the high frequency portion of the mobile station and a fixed wireless terminal device, and a transmitting / receiving splitter providing a separate path for transmitting and receiving between the fixed wireless terminal device and the 900 MHz mobile device ( 28) and, Transmitter 29 for processing the signal of the directional radio terminal device and transmits the signal from the antenna 27 to the antenna 27 through the transmission and reception splitter 28 and the transmission and reception splitter 28. Receiver 30 for uplink processing, an upconversion for converting the baseband signal of the transmitter and the receiver into an RF signal, and a downconversion for converting the RF signal to a baseband signal. A local oscillator 31 which generates a large number of main units, and a block in charge of signal processing required in a 900 MHz codeless telephone function, which processes baseband transmit / receive level estimation and the baseband analog signal output from the receiver 30, And an FM baseband processor 32 that performs modulation, demodulation, baseband filtering, preampsis and deampsis.

When using the communication method and the device in the present invention, the fixed wireless terminal device operating in the 2,3-2.4GHz band implements the relay function with the 900MHz codeless phone and is limited by the existing 900MHz codeless phone. There is an effect that can provide mobility.

Description

Dual band communication method and device

The present invention implements a relay function with a 900MHz codeless telephone in a fixed bidirectional wireless terminal device operating in the 2.3-2.4GHz band, and can also be used with a fixed wireless terminal device and is limited to the relay function of a conventional 900MHz codeless telephone. The present invention relates to a configuration method of a dual band system for providing mobility, and the present invention can be used for telephony communication such as voice and non-voice.

(Prior art and problems)

In general, a subscriber access device in a wireless network is fixed and is located indoors and is connected to various subscriber terminal devices to be serviced in a wireless network system instead of a conventional wired network. Therefore, there is a lack of limited mobility in the room of the cordless telephone in the existing wired network.

In addition to guaranteeing the quality of service as in the wired network, there is a need to provide convenience for customers by providing mobility.

Therefore, the present invention implements a relay function with a 900MHz codeless telephone in a fixed two-way wireless terminal device operating in the 2.3 ~ 2.4GHz band, it is also possible to use a fixed wireless terminal device as a relay function of the existing 900MHz codeless telephone The present invention provides a method for configuring a dual band system to provide limited mobility.

(Means to solve the task)

In order to solve the above problems, the fixed wireless terminal device installed indoors communicates with an external base station operating in the 2.3-2.4GHz band, and the portable wireless terminal device has a limited mobility of 900 MHz. It provides a dual band communication method for communicating using a cordless telephone function.

In addition, an apparatus for realizing the communication method, an antenna for transmitting and receiving data in a wideband code division multiplex (CDMA) of 2.3-2.4GHz band between the fixed wireless terminal device and the base station, and the transmission and reception between the base station and the bidirectional wireless terminal device A transmitting / receiving divider providing a separate path at the time of transmission, a transmitting unit for processing a signal of a bidirectional wireless terminal device and transmitting the signal from the antenna to the antenna, and a receiving unit receiving and processing a signal from the antenna through the transmitting / receiving splitter; A local oscillator for generating a frequency for upconversion for converting the baseband signal from the transmitter and receiver to an RF signal and for downconversion for converting the RF signal to a baseband signal; D / A converter for converting signals into analog signals, A / D converter for converting analog signals into digital signals, and CDMA ASIC It consists of baseband processing unit which performs CDMA digital signal processing such as modulation / demodulation of bidirectional signal, spread / despread, interleaving and deinterleaving, channel encoding and decoding, power control, CPU, memory, etc. A control / connection unit for data storage and communication functions, a voice coder for processing a voice signal by connecting to a transmitter and a receiver by a vocoder and a codec, and various states of a fixed wireless terminal device are displayed. A display device such as an LCD, a keypad for inputting an input, a high frequency part composed of a transceiver for receiving and transmitting voice, an antenna for transmitting and receiving a signal between a 900 MHz portable device and a fixed wireless terminal device, and a fixed wireless terminal device. Transmitter / receiver splitter that provides separate paths for transmission and reception between and 900MHz handheld devices, and processes and transmits and receives signals from bidirectional wireless terminal devices. A transmitter for transmitting to the antenna via a splitter, a receiver for receiving and processing signals from the antenna, and an upconverter for converting baseband signals from the transmitter and receiver into RF signals, A local oscillator that generates a frequency for downconversion that converts an RF signal into a baseband signal, and a block that is responsible for signal processing required in a 900 MHz codeless telephone function. It has a low-frequency part consisting of an FM baseband processor that processes the baseband analog signal outputted from the APC and performs modulation, demodulation, baseband filtering, preampsis, and deampsis. Provides dual band fixed wireless terminal device capable of high frequency communication and 900MHz FM communication.

(Example)

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

1 is a configuration of a dual band system for providing limited mobility by using a fixed wireless terminal device operating in the 2.3 ~ 2.4GHz band and a cordless telephone function in the 900MHz band. That is, the base station 13, the 900MHz band portable device 11 and the fixed wireless terminal device 12 of the present invention is divided into three major parts.

The fixed wireless terminal device 12 is wirelessly connected to the base station by 2.3 to 2.4 GHz wideband code division multiplex (CDMA) and communicates with the mobile device 11, which is a conventional 900 MHz codeless telephone, by 900 MHz FM radio. do.

At this time, since the fixed wireless terminal device 12 must transmit and receive using different antennas in wireless communication with the base station 13 and the cordless telephone, there are two antenna terminals in the main body. The portable device 11 is a conventional 900MHz codeless telephone and is used to provide limited mobility to a user, and communicates with the fixed wireless terminal device 12 in a 900MHz FM wireless communication system.

The fixed wireless terminal device 12 receives a signal from the portable device 11 and upconverts it to a frequency of 2.3 to 2.4 GHz again, thereby wirelessly communicating with the base station 13 in a code division multiplex (CDMA) manner. do.

FIG. 2 is a detailed block diagram of a module operating in the 2.3 to 2.4 GHz band among the fixed wireless terminal device 12 of FIG. 1. That is, the signal transmission procedure from the antenna 14 for transmitting and receiving data to the base station to the transceiver of the fixed wireless terminal device as a main block.

In the block diagram of FIG. 2, the antenna 14 is responsible for transmitting and receiving data with a fixed wireless terminal device and a base station in a wideband code division multiplex (CDMA) of 2.3-2.4 GHz band. Provides a separate path for transmission and reception between terminal devices. The transmitter 16 transmits a signal to the antenna 14, and includes a power amplifier for amplifying an RF signal, an upconverter (UP-CONVERTER), and a band, which are responsible for converting a baseband signal having a low frequency into an RF frequency signal. It consists of a bandpass filter for transmitting only the optimal signal by suppressing external noise and spurious components, and a gain control device for adjusting the transmission output.

Receiving unit 17 converts an ultra short amplifier, a bandpass filter, and a received RF signal into a baseband signal, amplifying the signal while minimizing the input noise with respect to the signal inputted from the antenna channel 14 through the transmission / reception splitter 15. Down converter (converter), and a gain control device for maintaining a constant power of the received signal. In particular, the noise generated by the ultra-short amplifier is generated over the entire band. Using a band pass filter, the optimum signal can be received by suppressing the out-of-band noise level and removing the spurious components.

The local oscillator 18 is a frequency generator for up-conversion for converting baseband signals from the transmitter and receiver to RF signals and for downconversion for converting RF signals to baseband signals. It is connected to the up-converter (UP-CONVERTER) and down-converter (DOWN-CONVERTER) of the receiver.

The D / A converter 19 converts the digital signal from the baseband into an analog signal before transmitting it to the transmitter, and the A / D converter 20 converts the analog signal from the receiver into a digital signal. The baseband processor 21 transmits the data. The baseband processor 21 is composed of a CDMA ASIC and is in charge of CDMA digital signal processing such as modulation / demodulation, spreading / despreading, interleaving and deinterleaving, channel encoding and decoding, power control, etc. according to a standardized wireless access standard. do.

The control / connection unit 22 is composed of auxiliary circuits for connection with the CPU, memory, and other blocks, and the CPU performs initial software processing and timing estimation functions for the purpose of controlling the overall system. The memory can use programs, data, and nonvolatile memory. The program memory contains software of fixed devices and necessary constant data values, and the data memory is used for temporary storage of each variable during operation. The nonvolatile memory also stores program variables that are required for operation when the device is powered on and off. In addition, the display device 24 includes a connection function with the display device 24 and the keypad 25, a serial asynchronous communication with the handset, a serial communication controller for bidirectional data transmission, and the like. It performs control functions that allow the system to operate in CDMA mode and 900MHz FM mode.

The voice encoder 23 is composed of a vocoder and a codec. When the CDMA mode is operated, the voice encoder 23 performs a connection function with the handset, and all communication with other sub-blocks is performed through the control / connection unit.

The voice is converted into a digital signal by the codec, and the vocoder performs the function of encoding the voice signal into a low bit rate signal form. When the fixed wireless terminal device operates only in the CDMA mode (i.e. when communicating using its own handset), the voice is input to the vocoder through the codec.

However, when the subscriber uses a portable device, the codec in the fixed wireless terminal device does not need to go through. This is because it already passes through the codec of the mobile device.

The display device 24 is usually composed of an LCD, and is a device for displaying various states of the fixed wireless terminal device, that is, a telephone number being dialed or transmitted, signal strength, and battery remaining amount. The keypad 25 is provided for making a call or programming a fixed wireless terminal device.

And the handset 26 is a kind of handset capable of making calls.

3 is a detailed block diagram of a module operating in the 900MHz band of the fixed wireless terminal device of FIG.

The antenna 27 of Figure 3 is responsible for the function of transmitting and receiving information between the existing 900MHz band portable device and the fixed wireless terminal device in the present invention, and the transmission and reception divider 28 is a fixed two-way wireless terminal device in the present invention Provides a separate path for transmission and reception between mobile devices at 900 MHz Since the functions of the transmitter 29, the receiver 30, and the local oscillator 31 are the same as those described in FIG. 2, the description thereof will be omitted.

The FM baseband processor 32 is a block for signal processing required in the 900MHz codeless telephone function, and performs a baseband transmit / receive level estimation function, a baseband analog signal output from the receiver, and a demodulation function, It performs functions such as baseband filtering, preampsis, and deampsis.

The above apparatus may be implemented to enable one or more additional portable devices having the same telephone number to be connected and used, or may be extended to a system providing multiple channels by connecting one or more subscriber station devices to a fixed wireless terminal device. have.

1 is a configuration of a dual band (Dual Band) system for providing limited mobility by using a fixed wireless terminal device operating in the 2.3-2.4GHz band and cordless telephone function of 900MHz band,

Figure 2 is a detailed block diagram of a module operating in the 2.3-2.4GHz band of the fixed wireless terminal device of FIG.

3 is a detailed block diagram of a module operating in the 900MHz band of the fixed wireless terminal device of FIG.

* Explanation of symbols for main parts of the drawings

11: portable device 12: fixed wireless terminal device

13 base station 14 antenna

15: transceiver splitter 16: transmitter

17: receiver 18: local oscillator

19: D / A converter 20: A / D converter

21: baseband processor 22: control / connection

23: speech encoder 24: display device

25: keypad 26: handset

27 antenna 28: transceiver splitter

29 transmitter 30 receiver

31 local oscillator 32 baseband processing unit

According to the device of the present invention as described above, by implementing a relay function with a 900MHz codeless telephone in a fixed wireless terminal device operating in the 2.3 ~ 2.4GHz band to provide limited mobility using the existing 900MHz codeless telephone Can be.

In addition, the system can be implemented so that one or more additional mobile devices having the same telephone number can be used and can be extended to a system providing multiple channels by connecting one or more subscriber station devices to a fixed wireless terminal device. Can meet a variety of needs.

Claims (4)

A fixed wireless terminal device installed indoors communicates with an external base station in the 2.3-2.4 GHz band, and a portable device having limited mobility with the fixed wireless terminal device communicates using a 900 MHz codeless telephone function. Band communication method. An antenna 14, which is responsible for transmitting and receiving data in a wideband code division multiplex (CDMA) system between the fixed wireless terminal device and the base station in the 2.3 to 2.4 GHz band, and provides a separate path for transmitting and receiving between the base station and the bidirectional wireless terminal device. Transmitter / receiver splitter 15, Transmitter 16 for processing signals from the bidirectional wireless terminal device and transmitting them to antenna 14 via the transceiver 15 and transmit / receive the signals from antenna 14 A receiver 17 for receiving and processing through the splitter 15, an upconversion for converting the baseband signals made in the transmitter and the receiver into an RF signal, and a downconversion for converting the RF signal into a baseband signal. A local oscillator 18 for generating a frequency for the following, a D / A converter 19 for converting a digital signal into an analog signal, and an A / D converter for converting an analog signal into a digital signal ( 20) and CDMA A It consists of SIC and baseband processor 21 which performs CDMA digital signal processing such as modulation and demodulation of bidirectional signal, spread / despread, interleaving and deinterleaving, channel encoding and decoding, power control, CPU, memory, etc. A control / connection unit 22 which controls the entire system, stores and communicates data, and a voice encoder 23 which is composed of a vocoder and a codec to connect to a transmitter and a receiver to process a voice signal. And a high frequency portion comprising a display device 24 such as an LCD for displaying various states of the fixed wireless terminal device, a keypad 25 for inputting an input, a transceiver 26 for receiving and transmitting a voice, and 900 MHz. An antenna 27 for transmitting and receiving signals between a large portable device and a fixed wireless terminal device, a transmitting and receiving splitter 28 providing a separate path for transmitting and receiving between the fixed wireless terminal device and the 900 MHz portable device, and a two-way wireless terminal device. A transmission unit 29 for processing a signal of the transmission and reception to the antenna 27 through the transmission and reception splitter 28, and a reception unit for receiving and processing a signal from the antenna 27 through the transmission and reception splitter 28. 30 and generating frequencies for up-conversion for converting the baseband signals from the transmitting and receiving sections into RF signals and for downconverting for converting the RF signals to baseband signals. Local oscillator 31 and the block responsible for the signal processing required in the 900MHz codeless telephone function, the baseband transmit and receive level estimation, the baseband analog signal output from the receiver 30, modulation and demodulation, baseband filtering And a low frequency portion consisting of an FM baseband processor 32 for preampsis and deampsis, and capable of 2.3-2.4GHz high frequency communications and 900MHz FM communications. Dual band fixed wireless terminal device. 3. The transmitter (16) according to claim 2, wherein the transmitter (16) and the transmitter (29) include a power amplifier for amplifying an RF signal, and an upconverter (UP-CONVERTER) responsible for converting a baseband signal having a low frequency into an RF frequency signal. And a band pass filter for transmitting only an optimal signal by suppressing out-of-band noise and spurious components, and a gain control device for adjusting a transmission output. 3. The receiver of claim 2, wherein the receiver 17 and the receiver 30, an ultra short amplifier that amplifies the signal while minimizing the input noise with respect to the input signal, and suppresses the out-of-band noise and spurious components to optimize A dual bandpass filter for receiving only a signal, a down-converter for converting the received RF signal to a baseband signal, and a gain control device for maintaining a constant power of the received signal. Fixed wireless terminal device of the band.