KR200165261Y1 - Fa conversion hand off cell system - Google Patents

Abstract

The present invention inputs a system clock output from a wireless communication system such as code division multiple access (CDMA) type CDMA or personal mobile communication (hereinafter referred to as PCS). Or a frequency assignment conversion handoff cell system that generates an IF signal from a PN generator of its own system to generate a CDMA or PCS signal (hereinafter referred to as an RF signal) in a time-division periodic form. ), And selects only a specific frequency band selected by a user from among a plurality of traffic FAs output from the base station in the FA selective frequency converter 100, and the remaining traffic except for the specific frequency band selected by the FA selective frequency converter 100. By time-dividing the frequency band in a pilot pilot frequency generator 200, the function of the repeater as well as the time of handoff The invention characterized in that to prevent the disconnection.

Description

FA conversion hand off cell system

The present invention is a traffic frequency assignmemt (FA) in a wireless communication system such as Cellular, Personal Mobile Communication (PCS) or IMT-2000 using Code Division Multiple Access (CDMA). (Hereinafter referred to as traffic FA) relates to an FA converted handoff cell system which prevents disconnection of all mobile stations by performing handoff between different base stations.

Conventionally, a call-drop phenomenon frequently occurs when a general base station using a large number of traffic FAs and a small CDMA base station using fewer FAs than a single or general base station are disposed adjacent to each other. In the case of a FA that is commonly used between a base station and a small base station, call connection may be made when the terminal is moved, but there is a problem that call disconnection occurs in different FAs.

The present invention is to solve the conventional problems as described above, the FA to output a plurality of RF signals in a time-division periodic form according to the time arbitrarily set by the user for the traffic FA can prevent the call disconnection during hand off The present invention provides a transform handoff cell system.

In order to achieve the above object, the inventive FA conversion handoff cell system selects only a specific frequency band selected by a user from among a plurality of graphic FAs output from a base station, and selects a specific frequency band selected by the FA selective frequency converter. Except the frequency band, the remaining traffic frequency band is generated in a time division manner in a time division periodic pilot frequency generator, thereby reducing the disconnection during handoff.

1 is a schematic block diagram showing a FA conversion handoff cell system of the present invention,

2 is a detailed block diagram of the FA selective frequency converter of the present invention,

3 is a detailed block diagram of a time division periodic pilot frequency generator of the present invention.

≪ Description of Codes for Major Parts of Drawings>

10, 40: antenna 20: divider unit

30: combiner portion 100: FA selective frequency converter

110: first duplex 112: second duplex

120: first frequency converter 122: second frequency converter

130: first channel selector 132: second channel selector

140: third frequency converter 142: fourth frequency converter

150: first high power amplifier 152: second high power amplifier

200: time division periodic pilot frequency generator

210: fifth frequency converter 220: third channel selector

230: 6th frequency converter 240: 3rd high power amplifier

Hereinafter, described in detail through the embodiment according to the present invention as described above.

The present invention is intended to facilitate handoff between different base stations in a traffic FA in a wireless communication system such as Cellular, PCS, or IMT-2000, and the present invention is not shown in the CDMA base station. It is operated in conjunction with the frequency converter (Upconverter).

FIG. 1 is a schematic block diagram of the present invention, in which an antenna 10 for receiving a plurality of traffic FAs output from a base station (not shown) and a traffic FA received through the antenna 10 are distributed. A divider unit 20, a FA selection frequency converter 100 for converting a specific frequency band selected by a user among the traffic FAs distributed by the divider unit 20, and a divider distributed by the divider unit 20. Except for a specific frequency band selected by the FA selective frequency converter 100 among the graphic FAs, the remaining frequency bands are generated in a time-division manner, so that the base stations having different traffic FAs in a cellular communication system such as Cellular, PCS, or IMT-2000 are different. A time division periodic pilot frequency generator 200 for smooth handoff, the FA selection frequency converter 100 and a time division periodic pilot frequency generator ( A combiner unit 30 which receives the signals output from 200 and combines these signals, and the FA selective frequency converter 100 and the time division periodic pilot frequency in the combiner unit 30; It is composed of an antenna 40 for transmitting a signal combined with the signal output from the generator 200.

The FA selective frequency converter 100 includes a first duplexer 110 for receiving and duplexing a specific traffic FA pre-selected by a user distributed by the divider unit 20, and the first duplex 110. The first frequency converter 120 for converting the RF signal applied through the IF signal frequency and the signal output from the first frequency converter 120 receives the CDMA bandwidth (1.23MHz or 5MHz) of 1FA The first channel selector 130 for setting, the third frequency converter 140 for receiving the traffic FA signal output from the first channel selector 130 and converting the received signal into an RF signal, and the third frequency conversion. The first high power amplifier 150 receives the traffic FA signal output after the frequency is converted by the unit 140 and amplifies the signal to a predetermined level signal, and the first high power amplifier 150 amplifies the signal to a predetermined level signal. A second duplex 112 for receiving a signal; The second frequency converter 122 converts the frequency into IF by receiving the traffic FA output from the second duplex 112, and the user receives the signal output from the second frequency converter 122 in advance. A second channel selector 132 which is assigned a desired frequency band, a fourth frequency converter 142 which receives a traffic FA signal output from the second channel selector 132 and converts it into an RF signal; And a second high power amplifier 152 that receives the traffic FA signal output after the frequency band is changed by the fourth frequency converter 142 and amplifies the signal to a signal of a predetermined level.

The output frequency of the time division periodic pilot frequency generator 200 may be used in both a cellular output frequency band (869-894 MHz), a PCS output frequency (1840-1870 MHz), and an IMT-2000 (2110-2200 MHz). As can be, the bandwidth has a bandwidth of 1.23 MHz or 5 MHz used in the CDMA scheme, and the center frequency as an input frequency signal is a system clock or an RF output signal (Cellular, PCS or IMT-2000).

The time-division periodic pilot frequency generator 200 receives the remaining traffic FA except for a specific traffic FA previously selected by the user in the FA selective frequency converter 100 and converts the received frequency FA into an IF frequency 210. ), A third channel selector 220 configured to receive an IF signal output from the fifth frequency converter 210 and set a CDMA bandwidth (1.23 MHz or 5 MHz) of 1FA, and the third channel selector ( The sixth frequency converter 230 converts the IF signal applied from the RF signal into an RF signal, and the traffic FA signal output from the sixth frequency converter 230 in a time-division manner. A fourth high power amplifier 240 to amplify.

Referring to the accompanying drawings, the operation, effects of the present invention configured as described above are as follows.

After receiving the plurality of traffic FAs output from the base station through the antenna 10, the divider 20 is distributed.

At this time, one of the plurality of traffic FAs of a specific frequency band preset by the user, for example, 1 FA, is input to the first duplex 110.

As such, after the traffic FA of the specific frequency band selected by the user is input to the first duplex 110, the first frequency converter 120 converts the RF signal into an IF signal.

The traffic FA whose frequency is converted by the first frequency converter 120 is input to the first channel selector 130 and is set to a CDMA bandwidth (1.23 MHz or 5 MHz) of 1FA.

As such, after being allocated to the CDMA bandwidth (1.23 MHz or 5 MHz) of 1FA, which is a specific frequency band set by the user, the first channel selector 130 is converted into an RF signal by the third frequency converter 140. The first high power amplifier 150 is then amplified to a constant signal level.

As described above, the traffic FA amplified to a level of a predetermined signal in the first high power amplifier 150 is combined with a signal output from the time division periodic pilot frequency generator 200 by the combiner 30, and then an antenna. It is output through 40.

On the other hand, the plurality of traffic FA signals received through the base station is distributed in the divider unit 20, in this case, as described above, the traffic FA of a specific frequency band previously selected by the user in the FA selection frequency converter 100 Except only, the remaining traffic FA signals are received by the time division periodic pilot frequency generator 200.

As such, the fifth frequency converter 210 of the time division periodic pilot frequency generator 200 that receives the remaining traffic FA signals except for the specific frequency band selected by the user converts the IF signals into IF signals.

After the fifth frequency converter 210 converts the RF signal to an IF signal, the third channel selector 220 selects a frequency by generating a channel for the traffic FA in a time division manner.

As such, after selecting the frequency output from the third channel selector 220 in the time division manner, the sixth frequency converter 230 converts the IF signal into an RF signal.

Thereafter, the combiner unit 30 combines the signal output from the FA selective frequency converter 100 and the signal output from the time division periodic pilot frequency generator 200 and is then output to the outside through the antenna 40.

The FA conversion handoff cell system of the present invention configured as described above is time-division except for a FA selection frequency converter for selecting and outputting a traffic FA of a specific frequency band according to a user's selection, and a traffic FA selected by the FA selection frequency converter. It is composed of a time division periodic pilot frequency generator that generates a traffic FA signal in a periodic form and prevents call-drop during handoff between base stations.

Claims (4)

The FA selection frequency converter 100 selects only a specific frequency band selected by a user among a plurality of traffic FAs output from the base station, and time-divisions the remaining traffic frequency bands except for the specific frequency band selected by the FA selection frequency converter 100. FA conversion handoff cell system characterized in that to generate a time-division method in the periodic pilot frequency generator 200 to reduce the call disconnection during handoff. 2. The FA converted handoff cell system according to claim 1, wherein the apparatus can be used in a cellular system, a PCS, or a wireless communication system of IMT-2000. The apparatus of claim 1, wherein the FA selective frequency converter (100) comprises: a first duplexer (110) for receiving and duplexing a specific traffic FA pre-selected by a user distributed by the divider unit (20); A first frequency converter 120 for converting an RF signal applied through the first duplex 110 into an IF signal frequency and a signal output from the first frequency converter 120 receive a CDMA bandwidth of 1FA ( 1.23MHz or 5MHz) and the first channel selector 130, the third frequency converter 140 for receiving the traffic FA signal output from the first channel selector 130 and converts it into an RF signal; The first high power amplifier 150 receives the traffic FA signal output after the frequency is converted by the third frequency converter 140 and amplifies the signal to a predetermined level, and the first high power amplifier 150 is fixed. Receiving an amplified signal at the signal level The second duplex 112, the second frequency converter 122 for receiving the traffic FA output from the second duplex 112 and converting the frequency into IF, and the second frequency converting unit 122 A second channel selector 132 that receives a signal and is assigned a desired frequency band preset by a user, and a fourth that receives a traffic FA signal output from the second channel selector 132 and converts the signal into an RF signal And a second high power amplifier 152 which receives the traffic FA signal output after the frequency is converted by the fourth frequency converter 142 and amplifies the signal into a signal of a predetermined level. A FA converted handoff cell system. The method of claim 1, wherein the time-division periodic pilot frequency generator 200 receives the remaining traffic FA except for a specific traffic FA previously selected by the user in the FA selective frequency converter 100 and converts the remaining traffic FA into an IF frequency. A fifth channel converter 210 and a third channel selector 220 for receiving the IF signal output from the fifth frequency converter 210 and setting the CDMA bandwidth (1.23MHz or 5MHz) of 1FA; Input the sixth frequency converter 230 for converting the IF signal applied from the third channel selector 220 into an RF signal, and the traffic FA signal output from the sixth frequency converter 230 in a time division manner. And a fourth high power amplifier (240) for receiving and amplifying the signal at a constant level.