AU726839B2 - CDMA mobile communication service method for overcoming RF null area problem and frequency translator thereof - Google Patents
CDMA mobile communication service method for overcoming RF null area problem and frequency translator thereof Download PDFInfo
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- AU726839B2 AU726839B2 AU21230/99A AU2123099A AU726839B2 AU 726839 B2 AU726839 B2 AU 726839B2 AU 21230/99 A AU21230/99 A AU 21230/99A AU 2123099 A AU2123099 A AU 2123099A AU 726839 B2 AU726839 B2 AU 726839B2
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- 238000010295 mobile communication Methods 0.000 title claims description 47
- 238000000034 method Methods 0.000 title claims description 20
- 238000012546 transfer Methods 0.000 claims description 70
- 238000001514 detection method Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 8
- 230000001413 cellular effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000007792 addition Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 206010010071 Coma Diseases 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15507—Relay station based processing for cell extension or control of coverage area
- H04B7/15514—Relay station based processing for cell extension or control of coverage area for shadowing compensation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
- H04B7/2634—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for channel frequency control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Description
a.
S
a a
AUSTRALIA
Patents Act 1990 KOREA TELECOM FREETEL CO., LTD., DOWON TELECOM CO., LTD.
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Invention Title: CDMA mobile communication service method for overcoming RF null area problem and frequency translator thereof The following statement is a full description of this invention including the best method of performing it known to us:- BACKGROUND OF THE INVENTION 1. Field of the Invention 6* The present invention relates to a frequency translator for a mobile communication service, and in particular to a CDMA mobile communication service method and an outdoor type frequency Stranslator which are capable of providing a good performance for a RF null area.
2. Description of the Background Art In view of a communication traffic of a CDMA mobile communication, 85% of the communication traffic is concentrated to 5% of the entire area in which a mobile communication service is available. In the remaining 95% area, about 15% traffic is concentrated. Therefore, a repeater unit is generally used in the area such as a highway, local road, open area, etc. in stead of using a base station which needs much cost for thereby effectively implementing a nationwide mobile communication system. However, the conventional repeater unit is generally designed to cover the RF null area which is formed due to a building, bush, tunnel, underground space or a predetermined obstacle. Namely, the dO repeater unit is mainly used in a underground area or an indoor area such as a tall building which is separated from an open ground.
'1- Figure 1 illustrates a conventional repeater unit generally used for an above-ground trunk and in a highway area, local road, open area, etc. As shown therein, if the conventional repeater unit is installed in an outdoor area, the frequencies of Fl (1840-1850MHz), S" F2(1750-1760MHz) are used for a link antenna A and a coverage *i antenna B of the repeater unit. In this case, there is a problem in that a feedback phenomenon, such as a spill over phenomenon, of the signal amplified by the repeater unit occurs.
In order to overcome the above-described problem, the signal i: received from an input terminal A of the repeater unit should be higher than 15dB compared to the signal looped back. If the gain of
S:
the repeater unit is 80dB, and the gain of the link antenna is the isolations of a receiver of the repeater link antenna A and the coverage antenna B should be 8 0+15+15=110dB.
In this case, it is difficult to implement an actual use of the above-described system. In order to overcome the above-described problem, as shown in Figure 2, an above-ground trunk method which is implemented by a fiber optic or trunk cable is generally used.
But, in this case, the above-described system is used in a very do limited area due to its installation and coding limit. In the above-ground trunk method using the T1/E1 link, the mobile telephone system may be applicable for an analog system such as AMPS or a digital system which uses a TDMA method. In the case of the CDMA, it is impossible to implement an application of the same due to its band width limit. In addition, in the case of using the fiber optical 25/09 '00 MON 10:46 FAX 61 2 9810 8200 F EARICE CO.
61 2 9810 8200 3 cable, various systems such as SMPS, TDMA, CDMA, etc. may be available.
In this case, an optical cable is used between the base statement and the repeater unit. Namely, the fabrication and installation of the optical fibers are determined based on the wavelength of the optical cable in accordance with the frequency. In addition,the environment which may be damaged due to the installation of the optical cables should be considered. With the above-described problems, the above-described system is not widely used.
Therefore, the wireless link which may be substituted with the abovedescribed wire-based link is urgently needed.
The preceding description in no way constitutes an admission of the common general knowledge of a person skilled in this field.
SUMMARY OF THE INVENTION The present invention provides a CDIVIA mobile 005 9 a. *a 9a .9 9 *a 9 9a **99 a .a .9 9* *9 9 9 (z9 RECEIVED TIME 25, SEP, 10:40 PRINT TIME 25. SEP. 10:58 25/09 '00 MON 10:47 FAX 61 2 9810 8200 F LA RICE CO.
61 2 9810 8200 [a 007 comfuflica t ion- service method which inc.ludes a f orward link step for transferrinrg an information from the servi-ce area to a RE nuill area, and a backward link step f or trans ferring the inf ormation, f rom the RF null area to the service area in the CDMA mobile communication 13 service method for implementing a communication service from a service area in which a base station is installed to an area in which the base station is not installed* In the present invention, the forward link step includes a step for transferring an information from a base station in the I C service area using a first transfer frequency of a CDMA mob-ile communication service band, a step for receiving the f izst transf er frequency in the service area and translat-ing the thusly received .:first 'transfer frequency to a second transfer frequency in the CZDMA *mobile communication service band, a step for receiving the second C. transfer frequency signal in the RE null area and translating co the fizst transfer frequency, anid a step for providing a ODMA mobile communication service to a subscriber in the IRE null area using the translated first transfer frequency.
I~n addition, the backward link step includes a step for :receiving an information from the subscriber terminal in the RF .nu!l area us~ing the third transfer frequency in a mobile communication service band, a step for translati-ng the c-hird tr-ansfer frequency in ""he RE null area to a fourth transfer frequency in t he mobile communication service band, and a step fcr receilftng r-he fourth 7-ansfer frequency signal in the servir:ce area, 7 4 RECEIVED TIME 25. SEP. 10:40PITTME 2.S. 105 PRINT TIME 25,Q.EP, 10:58 25/09 '00 MON 10:47 FAX 61 2 9810 8200 F EA RICE CO.
61 2 9810 8200 009 translating to the thusly received fourth transfer frequency signal to the third transfer frequency and providing to a subscriber.
Preferably, the present invention provides a CDMA mobile communication service method for overcoming an RF null area problem for providing a mobile communication service to a CDMA mobile communication subscriber terminal in an RF null area.
Embodiments of the present invention may provide an outdoor type frequency translator which may be installed in an open area and highway area for providing a CDMA mobile communication service in an RF null area.
Further embodiments of the present invention may provide a DU error detection method for implementing a maintenance of an outdoor type frequency translator.
In preferred embodiments of the invention there is provided an outdoor S* S
S
S
S
S
S
S.
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9 :i RECEIVED TIME 25-SEP. 10:40 PRINT TIME 25, SEP. 10:57 -25/09 '00 MON 10:48 FAX.61 2 9810 8200 F [A RICE CO. Z011i 61 2 9810 8200 type frequency translator -hict includes a DU (Donor~ Unit) in-stailed in a service area for receiving a first transfer f reqluency f rom a base station in the service area in a predetermined COMA mobile communication service band, translatin~g the thusly received first transf er f requency to a second transf er f requency i n the CDMA mobile communication service band based on a wireless transfer manner, translating the fourth transf'-ar frequency signal1 in the ODNIA mobile communication service band received from a R.U to the third transfer frequency signal of the CDMA moci~e comnmunicat ion service band, and transferring the tzanslateci third transfer frequency signal to the base station installed in the 9service area, and a plurality of RUJ(Repeater Unit) installed in the 9 R~null area for receivina the second transfer frequency from the DtJ, translating the thusly received second transfer frequency zo the first transfer frequency, transferring th e t2:anslated first transfer frequency to the subscriber terminal in the RE' null area, S and translating the third ctransfer frequency received from the 9 subscriber terminal1 in the RF null area to the fourth transfer frequency signal in the outeoor type frequency translator for- ~Oimplementing a COM1A mobile communication service from a service in hic a base station is installed to a RF nulL area in which the base 7 RECEIVED TIME 25. SEP. 10:40 PRINT TIME 25. SEP. 10:57 25/09 '00 MON 10:48 FAX 61 2 9810 8200 F E RICE CO. 3 F013 61 2 9810 8200 6 station is not installed.
Further embodiments may provide a DU error checking method which includes a forward link error detection step for detecting an error of the DU with respect to a signal flow from Sa base station installed in the service area to a terminal installed in the RF null area, and a backward link error detection step for detecting an error of the DU with respect to a signal flow from the terminal installed in the RF null area to the base station installed in the service area in the DU (Donor Unit) error detection method for an outdoor type frequency translator which includes a DU installed in a service area for translating one transfer frequency to another transfer frequency in a predetermined mobile communication service band for providing a mobile communication service in a RF null area, and a RU (Repeater Unit) installed in a RF null area for translating the frequency.
In the present invention, the forward link error detection step may include a step for checking a waveform signal reached the RU when the waveform signal outputted from the base station reaches the RU via the DU, and a step for transferring the DU error
CC
information when it is judged that the DU has an error as a result of the checking to a checking center for thereby detecting an error of the DU with respect to the forward link..
In addition, the backward link error detection step may include a step for detecting an error of the DU with respect to the backward .link, a step for disconnecting the forward link when the error is RECEIVED TIME 25, SEP. 10:40 PRINT TIME 25. SEP. 10:57 detected in the DU, and a step for detecting a disconnection of the forward link in the RU, transferring the DU error information to the checking center and detecting the error of the DU.
S BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein: Figure 1 is a view illustrating a conventional repeater unit used for an above-ground trunk or in an open area from radio such as a highway, local road, open area, etc.; o•Figure 2 is a view illustrating an above-ground trunk method using a fiber optical or trunk cable for overcoming a RF null area 1 problem; S* Figure 3 is a view illustrating a CDMA mobile communication network with respect to a repeater unit according to the present invention; and Figure 4 is a view illustrating a channel installation of a PCS(Personal Communication System) service according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENTS
As shown in Figure 3, the FT(Frequency translator) according to the present invention includes a DU(Donor Unit) 320 installed in 25/09 '00 MON 10:49 FAX 61 2 9810 8200 F 1A RICE CO. Q015 61 2 9810 8200 8 a service area of a base station(BTS) 310, and a RU(Repeater Unit) 340 installed in the center of the service area(RF null area, 350) Here, the link for implementing an information transfer from the service area 300 to the RF null area in which the base station S is not installed is called as a forward link, and the link for implementing an information transfer from the RF null area 350 to the service area 300 is called as a backward link.
In the case of the forward link, the DU 320 receives a first transfer frequency F1 in the CDMA mobile communication service band Io from the base station 310 of the service area 300 and translates the S thusly received frequency Fl to a second transfer frequency F3 of the CDMA mobile communication service band. In addition, in the S case of the backward link, a fourth transfer frequency F4 of the CDMA mobile communication service band from the RU 340 is translated to is a third transfer frequency F2 of the CDMA mobile communication I: service band and then transfers to the base station 310 of the service area 300. The DU 320 operates by a lower power and may use a solar cell 322 as a power supply source. In addition, a battery 322 capable of storing an electrical energy generated by the solar cell 322 may be used.
:.9b In the case of the forward link, the RU 340 receives a second transfer frequency F3 from the DU 320 and translates the thusly received frequency F3 to th first transfer frequency Fl and transfers to the subscriber terminal 360 in the RF null area. In the case of the backward link, the third transfer frequency F2 received RECEIVED TIME 25. SEP. 10:40 PRINT TIME 25. SEP, 10:57 from the subscriber terminal 360 in the RF null area is translated to the fourth transfer frequency F4 and then is outputted to the DU 320 based on the wireless transfer. In the drawings, three RU 340 are shown. But, the number of the same is not limited thereto. Namely, Sa plurality of the RU may be adapted.
Here, the first through fourth transfer frequencies are referred to as a transfer frequency in the frequency band allocated to the CDMA mobile communication service company. The CDMA mobile communication frequency band includes a PCS frequency band as well I0: as a cellular frequency band. Figure 4 illustrates a channel installation of the PCS service company. In addition, the following 9 9 tables 1 and 2 illustrate the frequencies based on the channel.
Table 1 illustrates the mobile station transfer(base station receiving) frequencies, and Table 2 illustrates the base station transfer(mobile station receiving) frequencies. The CDMA central frequency is used at an interval of 1.25MHz.
9 [Table 1] Mobile station transfer(base station receiving) frequencies
S..
a a FA Center FA Center FA Center number frequency number frequency number frequen- [MHz] [MHz] cy [MHz] 1 1751.25 8 1761.25 15 1771.25 2 1752.50 9 1762.50 16 1772.50 3 1753.75 10 1763.75 17 1773.75 4 1755.00 11 1765.00 18 1775.00 1756.25 12 1766.25 19 1776.25 6 1757.50 13 1767.50 20 1777.50 7 1758.75 14 1768.75 21 1778.75 *r 0 0* I .r *r *r I [Table 2] Base station transfer(mobile station receiving) frequencies FA Center FA Center FA Center number frequency number frequency number frequen- [MHz] [MHz] cy [MHz] 1 1841.25 8 1851.25 15 1861.25 2 1842.50 9 1852.50 16 1862.50 3 1843.75 10 1853.75 17 1863.75 4 1845.00 11 1855.00 18 1865.00 5 1846.25 12 1856.25 19 1866.25 6 1847.50 13 1857.50 20 1867.50 7 1848.75 14 1858.75 21 1868.75 The CDMA mobile communication service method for overcoming a RF null area problem based will be explained. First, in the case of the forward link, when the base station BT 310 installed in the service area 300 transfers a RF signal Fl,the RF signal Fl is received by the DU 320 installed in the service area 320 and is translated to the signal F3. Thereafter, the frequency signal translated to the signal F3 by the DU 320 is received by the RU 340 installed in the RE null area 350 and is transferred to the subscriber terminal 360 of the RF null area.
In the case of the backward link, the RF signal F2 transferred S from the subscriber terminal 360 of the RF null area 350 is received by the RU 340 installed in the RF null area 350 and is translated to the signal F4. The thusly frequency translated signal F4 is transferred to the DU 320 installed in the service area 300. Next, the DU 320 receives the signal F4 transferred from the RU 340 and *see translates the same to the signal F2 and transfers to the base S. 0 60 station 310 installed in the service area.
boo**: In addition, the error detection method of the DU 320 and RU 340 of the outdoor type frequency translator 330 according to the present invention will be explained.
Here, since the DU 320 is generally installed on the peak of 0* 0* a mountain, the same is not connected with an error checking center boo* 370 using a wire. The forward link error detection of the DU 320 may be implemented in the conventionally known method. Namely, when the CDMA waveform signal from the base station 310 reaches the RU 340 do installed in the RF null area through the DU 320, the waveform signal reached the RU 340 is checked. As a result of the checking, if the system is judged to have an error, namely, if there is no waveform signal reached, or the waveform is greatly distorted, an error signal which indicates that the DU has an error is transferred to d the error checking center 370 for thereby detecting the error of the DU with respect to the forward link.
In addition, in the case of the backward link error detection of the DU 320, the DU error may be checked by itself with respect to the backward link in the DU. In addition, if a backward link error Sis detected, the forward link is disconnected. Therefore, it is possible to detect an error of the DU in the same manner as the forward link DU error detection. Namely, a disconnection of the forward link is detected in the RU 340 of the RF null area 350, and o the DU error information is transferred to the error checking Icenter 370 for thereby detecting the error of the DU.
As described above, the mobile communication service method S"according to the present invention is capable of implementing a communication service in the RF null area at a lower cost.
addition, the outdoor type frequency translator may be installed in an open area such as a highway area, etc.
Furthermore, the DU of the outdoor type frequency translator may be used at a lower power, so that a solar cell may be used as a power supply resource. In addition, since the signals are transferred and received based on the translation of the transfer o and receiving frequency in the service area, it is possible to implement a wide area communication without a forward and backward frequency interference.
Although the preferred embodiment of the present invention have been disclosed for illustrative purposes, those skilled in the s art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as recited in the accompanying claims.
14
Claims (5)
1. A CDMA mobile communication service method for implementing a communication service from a service area in which a base station is installed to an RF null area in which the base station is not installed, the method comprising: a forward link step for transferring information from the service area to the RF null area; and a backward link step for transferring the information from the RF null area to the service area, said forward link step including: a step for transferring information from the base station in the service area using a first transfer frequency of a CDMA mobile communication service band; a step for receiving the first transfer frequency in the service area and translating the thusly received first transfer frequency to a second transfer frequency in the CDMA mobile communication service band; a step for receiving the second transfer frequency signal in the RF c:n :null area and translating to the first transfer frequency; and a step for providing a CDMA mobile communication service to a "subscriber in the RF null area using the translated first transfer frequency, 20 and said backward link step including: a step for receiving information from the subscriber terminal in the RF null area using a third transfer frequency in a mobile communication service band; 25 a step for translating the third transfer frequency in the RF null area to a fourth transfer frequency in the mobile communication service band; and a step for receiving the fourth transfer frequency in the service area, translating the thusly received fourth transfer frequency to the third transfer frequency and providing to the base station.
2. The method of claim 1, wherein said CDMA mobile communication service band is a Personal Communication System frequency band.
3. The method of claim 1, wherein said CDMA mobile communication service band is a cellular frequency band. 4, An outdoor type frequency translator for implementing a CDMA mobile communication service from a service area in which a base station is Vi A udo yefeunytasao o mlmnigaC~l
4. RECEIVED TIME 25, SEP, 10:40 PRINT TIME 25- SEP, 10:56 25/09 '00 MON 10:50 FAX 61 2 9810 8200 F EA RICE CO. 61 2 9810 8200 1019 *099 .9 9 9* 9 9* 9 99 99 9 9 999* 9* 9 9
9. 9 *9 p 'x 1/ I: installed to an RF null area in which a base station is not installed, the outdoor type frequency translator comprising: A DU (Donor Unit) installed in the service area for receiving a first transfer frequency from a base station in the service area in a predetermined CDMA mobile communication service band, translating the thusly received first transfer frequency to a second transfer frequency in the CDMA mobile communication service band based on a wireless transfer manner, translating a fourth transfer frequency signal in the CDMA mobile communication service band received from a Repeater Unit to a third transfer frequency signal of the CDMA mobile communication service band, and transferring the translated third transfer frequency signal to the base station installed in the service area; and a plurality of RU (Repeater Units) installed in the RF null area for receiving the second transfer frequency from the DU. translating the thusly receiving second transfer frequency to the first transfer frequency, transferring the translated first transfer frequency to the subscriber terminal in the RF null area, translating the third transfer frequency received from the subscriber terminal in the RF null area to the fourth transfer frequency signal. and transferring the translated fourth transfer frequency signal to the 20 DU. 5. The outdoor type frequency translator of claim 4, wherein said DU uses a battery which is capable of storing an electrical energy generated by a solar battery as a power supply device. 6. The outdoor type frequency translator as claimed in claim 4 or claim 25 wherein the DU (Donor Unit) operates an error detection method including: a forward link error detection step for detecting an error of the DU with respect to a signal flow from a base station installed in the service area to a terminal installed in the RF null area; and a backward link error detection step for detecting an error of the DU with respect to a signal flow from the terminal installed in the RF null area to the base station installed in the service area, said forward link error detection step including: a step for checking a waveform signal reached the RU when the waveform signal outputted from the base station reaches the RU via the DU: and L" v N, RECEIVED TIME 25-SEP, 10:40 PRINT TIME 25, SEP. 10:56 25/09 '00 MON 10:51 FAX 61 2 9810 8200 F A RICE CO. Z1022 61 2 9810 8200 17 a step for transferring the DU error information to a checking centre for thereby detecting an error of the DU with respect to the forward link when it is judged that the DU has an error as a result of the checking, said backward link error detection step including: a step for detecting an error of the DU with respect to the backward link; a step for disconnecting the forward link when the error is detected in the DU; and a step for detecting a disconnection of the forward link in the RU, transferring the DU error information to the checking centre and detecting the error of the DU. 7. A CDMA mobile communication service method substantially as herein described and with reference to Figures 3 and 4 of the accompanying drawings. 8. An outdoor type frequency translator for implementing a CDMA mobile communication service substantially as herein described and with reference to Figures 3 and 4 of the accompanying drawings. C S: Dated this twenty-fifth day of September 2000 Korea Telecom Freetel Co., Ltd., Dowon Telecom Co., Ltd. Patent Attorneys for the Applicant: C C FBRICE&CO C K.' v\A RECEIVED TIME 25. SEP. 10:40 PRINT TIME 25, SEP. 10:56
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR98-9492 | 1998-03-19 | ||
| KR1019980009492A KR100277337B1 (en) | 1998-03-19 | 1998-03-19 | CDMA mobile telecommunication service providing method for solving RF null area and frequency converter therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2123099A AU2123099A (en) | 1999-10-07 |
| AU726839B2 true AU726839B2 (en) | 2000-11-23 |
Family
ID=19535087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU21230/99A Ceased AU726839B2 (en) | 1998-03-19 | 1999-03-16 | CDMA mobile communication service method for overcoming RF null area problem and frequency translator thereof |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100277337B1 (en) |
| AU (1) | AU726839B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2253324A (en) * | 1991-01-15 | 1992-09-02 | Orion Industries | Effecting hand off in a cellular system having frequency translating booster |
| US5659879A (en) * | 1993-07-30 | 1997-08-19 | Alcatel N.V. | Method of covering shadow areas in a cellular mobile radio system and radio booster for implementing this method |
| WO1999009762A1 (en) * | 1997-08-15 | 1999-02-25 | Hewlett-Packard Company | Frequency translation to local multi-point distribution systems for personal communications services |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0144208B1 (en) * | 1995-01-10 | 1998-08-01 | 이돈신 | Mobile communication high power repeater |
-
1998
- 1998-03-19 KR KR1019980009492A patent/KR100277337B1/en not_active Expired - Fee Related
-
1999
- 1999-03-16 AU AU21230/99A patent/AU726839B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2253324A (en) * | 1991-01-15 | 1992-09-02 | Orion Industries | Effecting hand off in a cellular system having frequency translating booster |
| US5659879A (en) * | 1993-07-30 | 1997-08-19 | Alcatel N.V. | Method of covering shadow areas in a cellular mobile radio system and radio booster for implementing this method |
| WO1999009762A1 (en) * | 1997-08-15 | 1999-02-25 | Hewlett-Packard Company | Frequency translation to local multi-point distribution systems for personal communications services |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100277337B1 (en) | 2001-01-15 |
| KR19990046160A (en) | 1999-07-05 |
| AU2123099A (en) | 1999-10-07 |
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