CN1235434C - Mobile communication coverage optimization system in residential districts - Google Patents
Mobile communication coverage optimization system in residential districts Download PDFInfo
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- CN1235434C CN1235434C CN 02145578 CN02145578A CN1235434C CN 1235434 C CN1235434 C CN 1235434C CN 02145578 CN02145578 CN 02145578 CN 02145578 A CN02145578 A CN 02145578A CN 1235434 C CN1235434 C CN 1235434C
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Abstract
The present invention relates to a mobile communication coverage optimization system in residential districts, which is characterized in that the mobile communication coverage optimization system in residential districts comprises a slight irradiation frequency-shift transmission device A, and a microwave secondary frequency-shift transmission device B, wherein the slight irradiation frequency-shift transmission device A is used for receiving a signal with the frequency of F0 in a base station and carrying out the frequency shift of the signal with the frequency of F0 to a signal with the microwave frequency of F1; the signal with the microwave frequency of F1 is transmitted to the microwave secondary frequency-shift transmission device B which is used for receiving the signal with the frequency of F1 of the microwave secondary frequency-shift transmission device B; the frequency shift is carried out on the signal with the frequency of F1 of the secondary frequency-shift transmission device B to the signal with the frequency of F0 to be sent to the base station. The mobile communication coverage optimization system in residential districts, which is designed by the present invention, has the advantages of good communication quality, low engineering difficulty, little engineering expense and flexible system location selection, and same-frequency interference can not be formed in use within the range of residential districts.
Description
Technical field: the present invention designs a kind of residential quarters mobile communication coverage optimization system.
Background technology: along with the modern city expanding economy, city size is increasing, and it is more and more that the standardization merchant of various different scales lives the sub-district.And living the sub-district, this merchant who differs from one another becomes a spotlight in the modern city dwelling house, and stand in great numbers owing to high level in these new residential quarters, close together between the Lou Yulou, generally one to three layer of outdoor and indoor movable signal all has more weakly in the sub-district, just becoming new city movable signal and covering weak signal area and blind area.Urban House housing estate development constantly develops people and uses the mobile phone probability to increase considerably in family, and the cellphone subscriber requires that speech quality is more and more higher at home.And have a large amount of mobile subscribers, the mobile phone signal covering problem in this class sub-district just becoming the problem that Mobile Network Operator is more and more paid close attention in these residential quarters; From a large amount of covering customer complaint data, also can obviously reflect this problem.This just forces to such an extent that mobile operator has to pay much attention to the mobile phone signal covering problem of residential quarters.Solve the sub-district and cover the necessary following key issue that solves:
The first, the problem of co-channel interference of overlay area.The second, cell system is to the base station interference problem.Three, the feasibility problem of scheme.Four, scheme must be protected benefits of operators, promptly guarantees the normal operation of operation system under the least possible investment.Five, scheme must be protected the vital interests of residential quarter resident family, guarantees that the people lives not to be subjected to bothering, and the cell environment construction remains unchanged.Six, scheme must be simple and direct, and it is very convenient to construct.
Present residential building community mobile communication G﹠amp; The C net covers the scheme of being taked following various ways:
1, the wireless discharging-directly station radio frequency is introduced scheme: characteristics: this scheme equipment cost is low, installs simply, and maximum shortcoming is that the base station is had interference.Especially in covering, many base stations urban cells should not adopt.
2, the fiber distribution scheme is introduced in the optical fiber repeater coupling: characteristics: good communication quality, can realize that by optical branching device fiber optic point covers multipoint cell, but precondition is, optical fiber must arrive the building, and especially in the city dweller sub-district covered, the optical cable construction difficulty was big, the expense height, cycle is long, and artificial difficulty is bigger, and project progress is not had guarantee.
3, introduce the microwave transmission scheme by the frequency-shift repeater coupling.Characteristics: speech quality is good, and the construction period is short, need not connect up, and is noiseless to the base station, and shortcoming is to realize that the point-to-multipoint sub-district covers.If adopt a plurality of microwaves repeater to realize that the multiple access covering has interference between then existing mutually, serious will influence speech quality and coverage effect, and the interference that may cause the base station.
4, microcellulor is introduced scheme: microcell base station is installed in the area of cell telephone traffic amount comparatively dense, is characterized in that speech quality is good, capacity is arranged again, its shortcoming is that to introduce the scheme system with optical fiber the same, must the 2M transmission put in place.And cost is high to negotiate difficulty with property and user, so can not thoroughly solve the indoor covering problem of whole sub-district.
From such scheme as can be seen, there is wretched insufficiency in the solution of sub-district covering in the past, because the residential quarter is different from the hotel or the office building in common public place, indoor distribution solution can't be implemented, because commercialization residential quarters, difficulty of construction is big, and the harmonious relations difficulty can only be taked outdoor solution.Because the sub-district is located in the urban area, optical fiber and wireless discharging-directly station are difficult to again implement, so cause the blind area of mobile communication.We advise adopting the application's patent scheme: promptly mobile communication covers microwave transmission secondary shift frequency one point for multiple address technical scheme.Like this, then can thoroughly solve the different local outdoor and indoor signal covering problems in residential quarters.
Summary of the invention: the objective of the invention is to design a kind of residential quarters mobile communication coverage optimization system, its good communication quality, the engineering difficulty is low, engineering cost is few, system's reconnaissance is flexible, and use can not form co-channel interference in the cell range.
The object of the present invention is achieved like this, residential quarters mobile communication coverage optimization system, it is characterized in that: it comprises: little shift frequency transmission equipment A that penetrates, be used to receive the signal that base station frequency is F0, and be that the signal shift frequency of F0 is the signal of F1 to microwave frequency with frequency, be that the signal of F1 sends to microwave secondary shift frequency transmission equipment B with microwave frequency; The frequency that is used to receive microwave secondary shift frequency transmission equipment B is the signal of F1, and is that the signal shift frequency of F1 is the signal of F0 to frequency with the frequency of secondary shift frequency transmission equipment B, sends to the base station;
Secondary shift frequency transmission equipment B is used to receive that little to penetrate shift frequency transmission equipment A frequency be the signal of F1, and being used for frequency is that the signal shift frequency of F1 is the signal of F2 to microwave frequency, and being used for shift frequency is that the signal of F2 sends to microwave shift frequency overlay device C to microwave frequency; The frequency that is used to receive microwave shift frequency overlay device C is the signal of F2, is that the signal shift frequency of F2 is the signal of F1 to microwave frequency with the frequency of the microwave shift frequency overlay device C that receives, is that the signal of F1 sends to little shift frequency transmission equipment A that penetrates with microwave frequency;
Microwave shift frequency overlay device C, the microwave frequency that is used to receive secondary shift frequency transmission equipment B is the signal of F2, and the microwave frequency that is used for the secondary shift frequency transmission equipment B that will receive is that the signal shift frequency of F2 is the signal of F0 and sends to mobile communication terminal to the used frequency of mobile communication terminal; Being used to receive signal and the shift frequency that the mobile communication terminal frequency is F0 is the signal of F2 to microwave frequency, and being used for microwave frequency is that the signal of F2 sends to microwave secondary shift frequency transmission equipment B.
Littlely penetrate that the signal transmission can be to be connected by coupler between shift frequency transmission equipment A and the base station.
Littlely penetrate that the signal transmission also can be to be electrically connected by antenna radio between shift frequency transmission equipment A and the base station.
Characteristics of the present invention are: owing to from the base station to the cell signal, adopt the microwave transmission of secondary shift frequency, so it has: and 1, speech quality is good, and the construction period is short, need not connect up, and is noiseless to the base station, can realize that the point-to-multipoint sub-district covers.2, equipment cost is low, installs simple.3, can thoroughly solve the indoor covering of whole sub-district.4, difficulty of construction is little, and expense is low, and the cycle is short.
Description of drawings:
The present invention will be further described below in conjunction with embodiment:
Fig. 1 is the system configuration schematic diagram of the embodiment of the invention 1;
Fig. 2 is the system configuration schematic diagram of the embodiment of the invention 2;
Fig. 3 is little shift frequency transmission equipment A schematic block circuit diagram of penetrating in the embodiment of the invention 1;
Fig. 4 is little shift frequency transmission equipment A schematic block circuit diagram of penetrating in the embodiment of the invention 2;
Fig. 5 is a secondary shift frequency transmission equipment B schematic block circuit diagram in the embodiment of the invention;
Fig. 6 is a microwave shift frequency overlay device C schematic block circuit diagram in the embodiment of the invention.
Embodiment:
Fig. 1 has provided the system configuration schematic diagram of the embodiment of the invention 1, residential quarters mobile communication coverage optimization system by littlely penetrate shift frequency transmission equipment A, secondary shift frequency transmission equipment B, microwave shift frequency overlay device C forms; Little shift frequency transmission equipment A that penetrates, being used for receiving base station frequency by a coupler is the signal of F0, and with frequency be the signal shift frequency of F0 to microwave frequency F1, be that the signal of F1 sends to microwave secondary shift frequency transmission equipment B with microwave frequency; The frequency that is used to receive microwave secondary shift frequency transmission equipment B is the signal of F1 and converts the signal that frequency is F0 to, is coupled to the base station by coupler; Secondary shift frequency transmission equipment B is used to receive that little to penetrate shift frequency transmission A device frequency be the signal of F1, be used for frequency be the signal shift frequency of F1 to microwave frequency F2, be used for shift frequency is sent to microwave shift frequency overlay device C to the signal of microwave frequency F2; The frequency that is used to receive microwave shift frequency overlay device C is the signal of F2, with the frequency of the microwave shift frequency overlay device C that receives be the conversion of signals of F2 to become microwave frequency be the signal of F1, being used for microwave frequency is that the signal of F1 sends to little shift frequency transmission equipment A that penetrates; Microwave shift frequency overlay device C, the microwave frequency that is used to receive secondary shift frequency transmission equipment B is the signal of F2, the microwave frequency that is used for the secondary shift frequency transmission equipment B that will receive is that to become the used frequency of mobile communication terminal be that the signal of F0 sends to mobile communication terminal to the conversion of signals of F2, to be used to receive the mobile communication terminal frequency be the signal of F0 and convert the signal that microwave frequency is F2 to, and being used for microwave frequency is that the signal of F2 is transmitted to microwave secondary shift frequency transmission equipment B.
Usually mobile communication terminal comprises existing mobile communication mobile phone, base, vehicle-mounted machine, mobile communication Internet device, and its operating frequency is consistent with base station frequency, and its scope is 400-960MHz.
Fig. 2 has provided the system configuration schematic diagram of the embodiment of the invention 2, residential quarters mobile communication coverage optimization system it equally by littlely penetrate shift frequency transmission equipment A, secondary shift frequency transmission equipment B, microwave shift frequency overlay device C forms; Little shift frequency transmission equipment A that penetrates, being used for receiving base station frequency by an antenna is the signal of F0, and with frequency be the signal shift frequency of F0 to microwave frequency F1, be that the signal of F1 sends to microwave secondary shift frequency transmission equipment B with microwave frequency; The frequency that is used to receive microwave secondary shift frequency transmission equipment B is the signal of F1 and converts the signal that frequency is F0 to, is coupled to the base station by antenna; Secondary shift frequency transmission equipment B is used to receive that little to penetrate shift frequency transmission A device frequency be the signal of F1, be used for frequency be the signal shift frequency of F1 to microwave frequency F2, being used for shift frequency is that the signal of F2 sends to microwave shift frequency overlay device C to microwave frequency; The frequency that is used to receive microwave shift frequency overlay device C is the signal of F2, with the frequency of the microwave shift frequency overlay device C that receives be the conversion of signals of F2 to become microwave frequency be the signal of F1, being used for microwave frequency is that the signal of F1 sends to little shift frequency transmission equipment A that penetrates; Microwave shift frequency overlay device C, the microwave frequency that is used to receive secondary shift frequency transmission equipment B is the signal of F2, the microwave frequency that is used for the secondary shift frequency transmission equipment B that will receive is that to become the used frequency of mobile communication terminal be the signal of F0 to the conversion of signals of F2 and send to mobile communication terminal, to be used to receive the mobile communication terminal frequency be the signal of F0 and convert the signal that microwave frequency is F2 to, and being used for microwave frequency is that the signal of F2 is transmitted to microwave secondary shift frequency transmission equipment B.
As shown in Figure 3, little shift frequency transmission equipment A that penetrates comprises: one receives, sending mobile communication frequency is the coupler A1 of the signal of F0, receive, sending mobile communication frequency is the duplexer A1 of the signal of F0, duplexer A1 is divided into two-way, one tunnel mobile communication frequency with reception is that the signal of F0 is delivered to a frequency converter A 1, this frequency converter A 1 is that to become the microwave frequency frequency be the signal of F1 for the conversion of signals of F0 with mobile communication frequency, microwave frequency is that the signal of F1 amplifies through a power amplifier A1, amplifying signal is delivered to a duplexer A2, sends by one again, reception antenna A2 sends; Another road is that the signal of F1 at first amplifies through low noise amplifier A2 with the microwave frequency that receives, deliver to a frequency converter A 2, this frequency converter A 2 with microwave frequency be the conversion of signals of F1 become mobile communication frequency be the signal of F0 through duplexer A1, send by sending, receive coupler A1 again.
As shown in Figure 4, little shift frequency transmission equipment A that penetrates also can comprise: one receives, sending base station frequency is the antenna A1 of F0 signal, one receives, sending base station frequency is the duplexer A1 of the signal of F0, duplexer is divided into two-way, one tunnel base station frequency with reception is the signal of F0, at first amplify through low noise amplifier A1, deliver to a frequency converter A 1, this frequency converter A 1 is that to become microwave frequency be the signal of F1 for the conversion of signals of F0 with frequency, with microwave frequency is that the signal of F1 is delivered to a band pass filter A1, the output of band pass filter A1 is amplified through a power amplifier A1, and amplifying signal is delivered to a duplexer A2, sends by one again, reception antenna A2 sends; Another road is the signal of F1 with the microwave frequency that receives, at first amplify through low noise amplifier A2, deliver to a frequency converter A 2, this frequency converter A 2 is that to become base station frequency be that the signal of F0 is delivered to a band pass filter A2 for the conversion of signals of F1 with microwave frequency, the output of band pass filter A2 is amplified through a power amplifier A2, amplifying signal is delivered to duplexer A1, is sent by transmission, reception antenna A1 again.
Two kinds of little structures of penetrating shift frequency transmission equipment A of Fig. 3 and Fig. 4, apparent at different access way designs, adopt the mode of Fig. 3 to have the reconnaissance flexible characteristic, and adopt the mode of Fig. 4 to have the low characteristics of cost.
As shown in Figure 5, secondary shift frequency transmission equipment B comprises: one receives, sending microwave frequency is the antenna B1 of the signal of F1, one receives, sending microwave frequency is the duplexer B1 of the signal of F1, duplexer is divided into two-way, one tunnel microwave frequency with reception is that the signal of F1 at first amplifies through low noise amplifier B1, deliver to a frequency converter B 1, this frequency converter B 1 is that to become microwave frequency be the signal of F2 for the conversion of signals of F1 with microwave frequency, with microwave frequency is that the signal of F2 is delivered to a band pass filter B1, the output of band pass filter B1 is amplified through a power amplifier B1, amplifying signal is delivered to a duplexer B2, sends by one again, reception antenna B2 sends; Another road is that the signal of F2 at first amplifies through low noise amplifier B2 with the microwave frequency that receives, deliver to a frequency converter B 2, this frequency converter B 2 is that to become microwave frequency be that the signal of F1 is delivered to a band pass filter B2 for the conversion of signals of F2 with microwave frequency, the output of band pass filter B2 is amplified through a power amplifier B2, amplifying signal is delivered to duplexer B1, is sent by transmission, reception antenna B1 again.
As shown in Figure 6, microwave shift frequency overlay device C comprises: one receives, sending microwave frequency is the antenna C1 of the signal of F2, one receives, sending microwave frequency is the duplexer C1 of the signal of F2, duplexer C1 is divided into two-way, one tunnel microwave frequency with reception is that the signal of F2 at first amplifies through low noise amplifier C1, deliver to a frequency converter C1, this frequency converter C1 is that to become the frequency of mobile communication terminal be the signal of F0 for the conversion of signals of F2 with microwave frequency, with the frequency of mobile communication terminal is that the signal of F0 is delivered to a band pass filter C1, the output of band pass filter C1 is amplified through a power amplifier C1, amplifying signal is delivered to a duplexer C2, sends by one again, reception antenna C2 sends; Another road is that the signal of F0 at first amplifies through low noise amplifier C2 with the frequency of the mobile communication terminal that receives, deliver to a frequency converter C2, this frequency converter C2 is that to become microwave frequency be the signal of F2 for the conversion of signals of F0 with the frequency of mobile communication terminal, deliver to a band pass filter C2 again, the output of band pass filter C2 is amplified through a power amplifier C2, amplifying signal is delivered to duplexer C1, is sent by transmission, reception antenna C1 again.
Among the present invention, the frequency range of F1, F2 is 1～20GHz, can guarantee that like this speech quality is unaffected, has the construction period weak point simultaneously, and the advantage that need connect up not the more important thing is the base station noiseless;
A secondary shift frequency transmission equipment B can carry out the information transmission in the face of many microwave shift frequency overlay device C simultaneously, can realize so some multipoint cell being covered, and can thoroughly solve the different local outdoor and indoor signal covering problems in residential quarters.
Claims (10)
1, residential quarters mobile communication coverage optimization system, it is characterized in that: it comprises: little shift frequency transmission equipment A that penetrates, be used to receive the signal that base station frequency is F0, and be that the signal shift frequency of F0 is the signal of F1 to microwave frequency with frequency, be that the signal of F1 sends to microwave secondary shift frequency transmission equipment B with microwave frequency; The frequency that is used to receive microwave secondary shift frequency transmission equipment B is the signal of F1, and is that the signal shift frequency of F1 is the signal of F0 to frequency with the frequency of secondary shift frequency transmission equipment B, sends to the base station;
Secondary shift frequency transmission equipment B, being used to receive little frequency of penetrating shift frequency transmission equipment A is the signal of F1, being used for frequency is that the signal shift frequency of F1 is the signal of F2 to microwave frequency, and being used for shift frequency is that the signal of F2 sends to microwave shift frequency overlay device C to microwave frequency; The frequency that is used to receive microwave shift frequency overlay device C is the signal of F2, is that the signal shift frequency of F2 is the signal of F1 to microwave frequency with the frequency of the microwave shift frequency overlay device C that receives, is that the signal of F1 sends to little shift frequency transmission equipment A that penetrates with microwave frequency;
Microwave shift frequency overlay device C, the microwave frequency that is used to receive secondary shift frequency transmission equipment B is the signal of F2, and the microwave frequency that is used for the secondary shift frequency transmission equipment B that will receive is that the signal shift frequency of F2 is the signal of F0 and sends to mobile communication terminal to the used frequency of mobile communication terminal; Being used to receive signal and the shift frequency that the mobile communication terminal frequency is F0 is the signal of F2 to microwave frequency, and being used for microwave frequency is that the signal of F2 sends to microwave secondary shift frequency transmission equipment B.
2, residential quarters according to claim 1 mobile communication coverage optimization system is characterized in that: littlely penetrate that the signal transmission can be to be connected by coupler between shift frequency transmission equipment A and the base station.
3, residential quarters according to claim 1 mobile communication coverage optimization system is characterized in that: littlely penetrate that the signal transmission also can be to be electrically connected by antenna radio between shift frequency transmission equipment A and the base station.
4, residential quarters according to claim 1 mobile communication coverage optimization system, it is characterized in that: little shift frequency transmission equipment A that penetrates comprises: one receives, sending mobile communication frequency is the coupler A1 of the signal of F0, one receives, sending mobile communication frequency is the duplexer A1 of the signal of F0, duplexer A1 is divided into two-way, one tunnel mobile communication frequency with reception is that the signal of F0 is delivered to a frequency converter A 1, this frequency converter A 1 is that the signal shift frequency of F0 is the signal of F1 to microwave frequency with mobile communication frequency, microwave frequency is that the signal of F1 amplifies through a power amplifier A1, amplifying signal is delivered to a duplexer A2, sends by one again, reception antenna A2 sends; Another road is that the signal of F1 at first amplifies through low noise amplifier A2 with the microwave frequency that receives, deliver to a frequency converter A 2, this frequency converter A 2 is that the signal shift frequency of F1 is the signal of F0 to mobile communication frequency with microwave frequency, through duplexer A1, sends by sending, receive coupler A1 again.
5, residential quarters according to claim 1 mobile communication coverage optimization system, it is characterized in that: little shift frequency transmission equipment A that penetrates comprises: one receives, sending base station frequency is the antenna A1 of F0 signal, one receives, sending base station frequency is the duplexer A1 of the signal of F0, it is two-way that duplexer divides A1, one tunnel base station frequency with reception is the signal of F0, at first amplify through low noise amplifier A1, deliver to a frequency converter A 1, this frequency converter A 1 is that the signal shift frequency of F0 is the signal of F1 to microwave frequency with frequency, with microwave frequency is that the signal of F1 is delivered to a band pass filter A1, the output of band pass filter A1 is amplified through a power amplifier A1, amplifying signal is delivered to a duplexer A2, sends by one again, reception antenna A2 sends; Another road is the signal of F1 with the microwave frequency that receives, at first amplify through low noise amplifier A2, deliver to a frequency converter A 2, this frequency converter A 2 is that the signal shift frequency of F1 is that the signal of F0 is delivered to a band pass filter A2 to base station frequency with microwave frequency, the output of band pass filter A2 is amplified through a power amplifier A2, amplifying signal is delivered to duplexer A1, is sent by transmission, reception antenna A1 again.
6, residential quarters according to claim 1 mobile communication coverage optimization system, it is characterized in that: secondary shift frequency transmission equipment B comprises: one receives, sending microwave frequency is the antenna B1 of the signal of F1, one receives, sending microwave frequency is the duplexer B1 of the signal of F1, duplexer B1 is divided into two-way, one tunnel microwave frequency with reception is that the signal of F1 at first amplifies through low noise amplifier B1, deliver to a frequency converter B 1, this frequency converter B 1 is that the signal shift frequency of F1 is the signal of F2 to microwave frequency with microwave frequency, with microwave frequency is that the signal of F2 is delivered to a band pass filter B1, the output of band pass filter B1 is amplified through a power amplifier B1, amplifying signal is delivered to a duplexer B2, sends by one again, reception antenna B2 sends; Another road is that the signal of F2 at first amplifies through low noise amplifier B2 with the microwave frequency that receives, deliver to a frequency converter B 2, this frequency converter B 2 is that the signal shift frequency of F2 is that the signal of F1 is delivered to a band pass filter B2 to microwave frequency with microwave frequency, the output of band pass filter B2 is amplified through a power amplifier B2, amplifying signal is delivered to duplexer B1, is sent by transmission, reception antenna B1 again.
7, residential quarters according to claim 1 mobile communication coverage optimization system, it is characterized in that: microwave shift frequency overlay device C comprises: one receives, sending microwave frequency is the antenna C1 of the signal of F2, one receives, sending microwave frequency is the duplexer C1 of the signal of F2, duplexer C1 is divided into two-way, one tunnel microwave frequency with reception is that the signal of F2 at first amplifies through low noise amplifier C1, deliver to a frequency converter C1, this frequency converter C1 is that the signal shift frequency of F2 is the signal of F0 to the frequency of mobile communication terminal with microwave frequency, with the frequency of mobile communication terminal is that the signal of F0 is delivered to a band pass filter C1, the output of band pass filter C1 is amplified through a power amplifier C1, amplifying signal is delivered to a duplexer C2, sends by one again, reception antenna C2 sends; Another road is that the signal of F0 at first amplifies through low noise amplifier C2 with the frequency of the mobile communication terminal that receives, deliver to a frequency converter C2, this frequency converter C2 is that the signal shift frequency of F0 is the signal of F2 to microwave frequency with the frequency of mobile communication terminal, deliver to a band pass filter C2 again, the output of band pass filter C2 is amplified through a power amplifier C2, amplifying signal is delivered to duplexer C1, is sent by transmission, reception antenna C1 again.
8, residential quarters according to claim 1 mobile communication coverage optimization system, it is characterized in that: the scope of described microwave frequency F1, F2 is 1～20GHz; The frequency of described F0 is consistent with base station frequency, and its scope is 400-960MHz.
9, residential quarters according to claim 1 mobile communication coverage optimization system is characterized in that: described secondary shift frequency transmission equipment B can carry out the information transmission in the face of many microwave shift frequency overlay device C simultaneously.
10, residential quarters according to claim 1 mobile communication coverage optimization system, it is characterized in that: mobile communication terminal comprises existing mobile communication mobile phone, base, vehicle-mounted machine, mobile communication Internet device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02145578 CN1235434C (en) | 2002-12-18 | 2002-12-18 | Mobile communication coverage optimization system in residential districts |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 02145578 CN1235434C (en) | 2002-12-18 | 2002-12-18 | Mobile communication coverage optimization system in residential districts |
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| CN1424864A CN1424864A (en) | 2003-06-18 |
| CN1235434C true CN1235434C (en) | 2006-01-04 |
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| CN 02145578 Expired - Fee Related CN1235434C (en) | 2002-12-18 | 2002-12-18 | Mobile communication coverage optimization system in residential districts |
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