CN1909406A - Radio communication system and method therefor - Google Patents
Radio communication system and method therefor Download PDFInfo
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- CN1909406A CN1909406A CN 200610110740 CN200610110740A CN1909406A CN 1909406 A CN1909406 A CN 1909406A CN 200610110740 CN200610110740 CN 200610110740 CN 200610110740 A CN200610110740 A CN 200610110740A CN 1909406 A CN1909406 A CN 1909406A
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Abstract
The invention provides a radio communication system and a radio communication method which achieve communication of high reliability between a mobile station and a plurality of base stations. The mobile station comprises a first reception part, a second reception part, a synthesizing part for synthesizing output signals of both reception parts, a selection part for selecting output signals of both reception parts, and a selection determination part for detecting base station identification signals of the plurality of different base stations from output signals of both reception parts. An antenna of the first reception part is placed in the front of an antenna of the second reception part in a movement direction, and the selection determination part controls selection between outputs of the first reception part and the second reception part in accordance with detecting the same base station identification signal or different base station identification signals from output signals of the first reception part and the second reception part.
Description
Technical field
The present invention relates to wireless communication system and wireless communications method, particularly the wireless communication system and the wireless communications method of the diversity system that in the communicating by letter of a plurality of base stations and mobile radio station, uses of employing.
Background technology
In the past, in wireless communication system, generally be by adopting following a series of order, carrying out the ways of connecting of mobile radio station and base station, promptly, cross under the situation that a plurality of base station area communicate at mobile radio station, receive different identification of base stations signals from each base station, in mobile radio station, with the identification of base stations signal that receives as base station specification signal foldback.According to this mode, that can realize connecting under the idle situation in next zone continues, in addition, owing to can take the existing zone of mobile radio station, and so have communication efficiency advantage preferably.
An example of expression wireless communication system (for example with reference to patent documentation 1) in the past among Fig. 5.In Fig. 5, the 501, the 502nd, the leakage coaxial cable (below be called the LCX cable) that carries out the radiation and the reception of electric wave, each LCX cable constitutes different wireless zones.The 503rd, be connected, constitute the base station A in the LCX zone (be also referred to as LCX zone A) of LCX cable 501 with LCX cable 501.This base station 503 has antenna multicoupler 505, receiver Rx506, transmitter Tx507, identification of base stations signal generator 508, constitutes the wireless base station.Equally, the 504th, be connected, constitute the base station B in the LCX zone (being also referred to as the LCX area B) of LCX cable 502 with LCX cable 502.This base station 504 has antenna multicoupler 509, receiver Rx510, transmitter Tx511, identification of base stations signal generator 512, constitutes the wireless base station.Each base station 503,504 sends different identification of base stations signals, mobile radio station 530 with the identification of base stations signal that receives as base station specification signal foldback.In addition, each base station is connected with control device 520 respectively, will supply to the control device 520 from the base station specification signal of mobile radio station 530 foldbacks.Control device 520 is according to by base station specification signal detector 521 and 522 detected base station specification signals, switch 523 switched select the base station system that will receive.Equally, switch 524 selects to send base station system.Circuit jockey 525 is connected with terminals 526,527 such as phones with control device 520.
On the other hand, mobile radio station 530 by receiver Rx533 demodulation, supplies in the circuit jockey 536 via shared device 532 by the electric wave that antenna 531 receives from LCX cable 501,502.In addition, be fed in the identification of base stations signal detector 535, consequently, be exported to circuit jockey 536 from another output of receiver Rx533.According to the identification of base stations signal, will be synthetic from the transmission output and the base station specification signal of circuit jockey 536, send from antenna 531 via transmitter Tx534, shared device 532.
Then, the action to system shown in Figure 5 describes.In Fig. 5, the signal that the identification of base stations signal generator 508 in the A503 of base station takes place is sent from transmitter 507, always sends from LCX cable 501 via shared device 505.Equally, the signal that the identification of base stations signal generator 512 in the B504 of base station takes place is sent from transmitter 511, always sends from LCX cable 502 via shared device 509.These identification signals are different in LCX zone A and LCX area B.At mobile radio station 530 during by LCX zone A, the electric wave by the antenna 531 of mobile radio station 530 receives from LCX cable 501 detects identification of base stations signal CC1 via shared device 532, receiver 533 by identification of base stations signal detector 535.
Under the situation that mobile radio station 530 sends, by the additional signal that sends as the appointment LCX zone A of base station specification signal, thereby communication line is connected with the base station A503 of LCX zone A.Leave LCX zone A and enter under the situation of adjacent LCX area B at mobile radio station 530, become antenna 531 by mobile radio station 530 and receive electric wave, detect the identification signal CC2 of the base station B504 of LCX area B by identification of base stations signal detector 535 from the LCX area B.In addition, the base station specification signal when sending is specified the LCX area B, thereby communication line is connected with the base station B504 of LCX area B.As mentioned above, constitute, handover of mobile stations communicates with the different interregional communication of a plurality of base stations successively.
Then, have single antenna and receive situation although understand above-mentioned mobile radio station from the electric wave of the leakage in LCX zone, but at mobile radio station while moving under the situation that receives electric wave, sometimes the state according to transfer path is subjected to decay (fading) or multichannel influences such as (multipath), and makes the accepting state variation.Method as improving this relatively poor accepting state adopts diversity reception mode.Diversity reception mode is to switch the received signal or the weighting that are obtained by a plurality of antennas according to signal electric power to synthesize the method that receives, particularly in digital mobile radio system, be improve to the effective means of the patience that moves decay together of terminal.
Fig. 6 represents the block diagram of the schematic configuration of general diversity receiver.In Fig. 6, will during receiving the RF 102-1 of portion, amplify from the received signal of antenna 101-1 input, carry out processing such as frequency translation, and supply among the demodulation section 103-1.In demodulation section 103-1, carry out digital demodulation, be that baseband signal is exported to synthetic portion 104 as complex signal.In addition, will be called the 1st acceptance division by the system that antenna 101-1, the reception RF 102-1 of portion, demodulation section 103-1 constitute.
On the other hand, similarly be provided with the 2nd acceptance division therewith.The 2nd acceptance division has antenna 101-2, receives the RF 102-2 of portion, demodulation section 103-2.The output of these the 1st acceptance divisions and the 2nd acceptance division is synthesized in synthetic portion 104, for example is carried out add operation.Synthetic method can be considered multiple, as representational be the high specific synthetic method.This method is, according to S/N that is included in the signal in each acceptance division (signal to noise ratio) or C/N (carrier-to-noise ratio), input signal is weighted respectively, and the control weight coefficient is so that the S/N of synthesized output signal or C/N be maximum.Output signal by synthetic portion 104 high specifics after synthetic is by lsb decoder 105 decodings, from lead-out terminal 108 output received signals.In addition, the signal decoding that lsb decoder 105 for example will be sent by I-Q reference axis quadrature modulation becomes original signal since to it by widely known, so omit detailed explanation.
In this diversity reception mode, 2 antennas with the less to a certain extent condition of configured separate to a certain degree, the 1st acceptance division that receives input electric power and the correlation between the 2nd acceptance division under, can reduce the deterioration of the bit error rate that decay brings effectively.
In addition, above-described diversity reception mode in common space wave transmission system, also is effective in the system of the leakage coaxial cable that is used for train radio etc. not only.Fig. 7 is the example of this system.Base station 503,504 is configured on train along the line, and the transmission signal of base station is applied in to the leakage coaxial cable LCX501,502 along the track laying of train.In addition, in above-mentioned example, only represented 2 base stations, but be actually a plurality of base stations along configuration along the line.This signal little by little emits to energy transmission on one side in the space on one side in leakage coaxial cable.Receiving its recipient, the antenna 101-1, the 101-2 that are installed in the outside of moving body (being also referred to as vehicle) 530 ' receive this emission signal, carry out demodulation by the acceptance division of vehicle interior.In addition, the acceptance division of vehicle interior for example is a structure as shown in Figure 6.
If will be arranged on antenna 101-1, the 101-2 configured separate suitably on the moving body 530 ' like this, then same with the situation of space wave, can expect the effect of diversity reception.But there is the time that receives different identification of base stations signals in this diversity system on the border of regional A and area B.For example, in Fig. 7, at vehicle 530 ' when the direction of arrow moves, the signal that is input among antenna 101-1, the 101-2 switches to signal from base station 504 from the signal from base station 503, but because antenna 101-1 and antenna 101-2 dispose along direct of travel, so it is different in two antennas to switch the timing of the signal that is received.Fig. 8 is the figure that is used for illustrating this state, and transverse axis is represented constantly.In Fig. 8, be switched at the input signal of moment T1 antenna 101-1, be switched at the input signal of moment T2 antenna 101-2.Thereby, before moment T1, suitably received by antenna 101-1,101-2 from the signal of base station 503, after moment T2, suitably received by antenna 101-1,101-2 from the signal of base station 504, assemble so suitably carried out dividing.From moment T1 to the moment T2, form the synthetic of different identification of base stations signals, received signal takes place not by the undesirable condition of normal demodulation.In addition, 2 antenna distances of general diversity reception mode are very short, and under the situation that the speed of train is travelled with the speed of tens Km～hundreds of Km, can expect from this moment T1 to being very short the moment T2, but the distance between antenna is longer, or under the situation of train low speed driving, might produce all can not elongated problem of received time from which signal of base station, wishes to have its countermeasure.
[patent documentation 1] TOHKEMY 2000-49683 communique
Cross under the situation that a plurality of base station area communicate at mobile radio station, in diversity system, owing to receive different identification of base stations signals on the base station area border, so it is elongated on this base station area border, or under the such situation of train low speed driving, might produce all can not elongated problem of received time from which signal of base station, wishes to have its countermeasure.
Summary of the invention
The purpose of this invention is to provide a kind of wireless communication system of communicating by letter and wireless communications method of realizing that mobile radio station is higher with the reliability between a plurality of base stations.
Another object of the present invention provides a kind of wireless communication system and wireless communications method reception that interference caused influence, that use diversity system that has reduced a plurality of base station area.
A further object of the present invention provides a kind of wireless communication system and the wireless communications method that can easily discern the identification signal of a plurality of base stations in diversity system.
Wireless communication system of the present invention constitutes, and has a plurality of base stations and the mobile radio station that is connected with above-mentioned base station by radiolink that send different identification of base stations signals; Above-mentioned mobile radio station has the 1st acceptance division, the 2nd acceptance division, the 1st synthetic portion that the output signal of the 1st acceptance division and the 2nd acceptance division is synthetic at least, the selection portion that the output signal separately of above-mentioned the 1st acceptance division and above-mentioned the 2nd acceptance division and above-mentioned synthetic portion is selected and the selection judging part that detects the identification of base stations signal of above-mentioned a plurality of base stations from the output signal of above-mentioned the 1st acceptance division and the 2nd acceptance division; The antenna of above-mentioned the 1st acceptance division is positioned at the place ahead of the antenna of above-mentioned the 2nd acceptance division with respect to the moving direction of above-mentioned mobile radio station; Above-mentioned selection judging part detects respectively under the situation of identical above-mentioned identification of base stations signal in the output signal from above-mentioned the 1st acceptance division and the 2nd acceptance division, selection is from the output signal of the above-mentioned the 1st synthetic portion, detect respectively under the situation of different above-mentioned identification of base stations signals in output signal, control the output signal of above-mentioned the 1st acceptance division that above-mentioned selection portion is selected the antenna that is positioned at the place ahead of above-mentioned mobile radio station from above-mentioned the 1st acceptance division and the 2nd acceptance division.
In addition, in wireless communication system of the present invention, constitute, the above-mentioned the 1st synthetic portion is synthetic with the output signal of above-mentioned the 1st acceptance division and the 2nd acceptance division by the high specific synthetic method.
In addition, in wireless communication system of the present invention, also constitute, above-mentioned selection judging part is under situation about detecting from some above-mentioned identification of base stations signals of above-mentioned the 1st acceptance division and the 2nd acceptance division, and all do not detect under the situation of above-mentioned identification of base stations signal in from above-mentioned the 1st acceptance division and the 2nd acceptance division any, control above-mentioned selection portion and select output signal from the above-mentioned the 1st synthetic portion.
In addition, in wireless communication system of the present invention, constitute, also possess the comparison judging part that the received electric field strength separately to above-mentioned the 1st acceptance division and the 2nd acceptance division detects, control above-mentioned selection portion according to above-mentioned relatively judgment result.
In addition, in wireless communication system of the present invention, constitute, detect respectively under the situation of different above-mentioned identification of base stations signals in the output signal of above-mentioned selection judging part from above-mentioned the 1st acceptance division and the 2nd acceptance division, based on above-mentioned relatively judgment result, control above-mentioned selection portion.
And then wireless communication system of the present invention constitutes, and has a plurality of base stations and the mobile radio station that is connected with above-mentioned base station by radiolink that send different identification of base stations signals; Above-mentioned mobile radio station has the 1st pair of acceptance division that is made of the 1st acceptance division and the 3rd acceptance division, the 2nd pair of acceptance division that constitutes by the 2nd acceptance division and the 4th acceptance division, the 2nd synthetic portion that the output signal of the 1st acceptance division and the 3rd acceptance division is synthetic, the 3rd synthetic portion that the output signal of the 2nd acceptance division and the 4th acceptance division is synthetic, with the 4th synthetic synthetic portion of the above-mentioned the 2nd synthetic portion and the above-mentioned the 3rd synthetic portion, synthesize the selection portion that portion and the above-mentioned the 3rd synthetic portion and the above-mentioned the 4th output signal separately of synthesizing portion are selected to the above-mentioned the 2nd, and the selection judging part that from the output signal of the above-mentioned the 2nd synthetic portion and the above-mentioned the 3rd synthetic portion, detects the identification of base stations signal of above-mentioned a plurality of base stations; The antenna of above-mentioned the 1st pair of acceptance division is positioned at the place ahead of the antenna of above-mentioned the 2nd pair of acceptance division with respect to the moving direction of above-mentioned mobile radio station; Above-mentioned selection judging part detects respectively under the situation of identical above-mentioned identification of base stations signal in the output signal from above-mentioned the 1st pair of acceptance division and above-mentioned the 2nd pair of acceptance division, selection is from the output signal of the above-mentioned the 4th synthetic portion, detect respectively under the situation of different above-mentioned identification of base stations signals in output signal, control the output signal of above-mentioned the 1st pair of acceptance division of antenna that above-mentioned selection portion selects to be positioned at the place ahead of above-mentioned mobile radio station from above-mentioned the 1st pair of acceptance division and the 2nd pair of acceptance division.
In addition, in wireless communication system of the present invention, at least 1 in the above-mentioned the 2nd synthetic portion and the above-mentioned the 3rd synthetic portion and the 4th synthetic portion is synthetic by the high specific synthetic method.
And then the present invention is the wireless communications method in the wireless communication system, and this wireless communication system has a plurality of base stations and the mobile radio station that is connected with above-mentioned base station by radiolink that send different identification of base stations signals; Above-mentioned mobile radio station has the 1st acceptance division at least, the 2nd acceptance division, with the 1st synthetic portion that the output signal of the 1st acceptance division and the 2nd acceptance division is synthetic, above-mentioned wireless communications method is, detect respectively under the situation of identical above-mentioned identification of base stations signal in output signal from above-mentioned the 1st acceptance division and the 2nd acceptance division, selection is from the output signal of the above-mentioned the 1st synthetic portion, detect respectively under the situation of different above-mentioned identification of base stations signals in output signal, select to be positioned at the output signal of above-mentioned the 1st acceptance division of antenna in the place ahead of above-mentioned mobile radio station from above-mentioned the 1st acceptance division and the 2nd acceptance division.
As mentioned above,, also can realize the communicating by letter of high reliability between mobile radio station and the base station, can reduce the influence of interference to receiving of a plurality of base station area even cross under the situation that a plurality of base station area communicate at mobile radio station.In addition, in diversity system, can easily discern the identification signal of a plurality of base stations.And then, in the diversity system of the train radio system that constitutes, uses leakage coaxial cable by a plurality of base stations, advantage is, even under the zone boundary receives situation from the transmission signal of different base stations, also can avoid the synthetic interregional interference that brings, the time that the interval that can not receive maybe can not be received reaches Min..
Description of drawings
Fig. 1 is the block diagram of the schematic configuration of expression one embodiment of the invention.
Fig. 2 is the figure that is used for illustrating another embodiment of the present invention.
Fig. 3 is the block diagram of schematic configuration of the receiving system of expression one embodiment of the invention shown in Figure 2.
Fig. 4 is the expression block diagram of the schematic configuration of an execution mode more of the present invention.
Fig. 5 is the block diagram of schematic configuration of representing an example of wireless communication system in the past.
Fig. 6 is the block diagram of schematic configuration of representing an example of diversity reception portion in the past.
Fig. 7 is the figure that is used for illustrating mobile communication system in the past.
Fig. 8 is used for the figure of action of key diagram 7.
Fig. 9 is used for illustrating figure of the present invention.
Embodiment
Utilize description of drawings one embodiment of the invention below.Fig. 1 is the block diagram of the schematic configuration of expression one embodiment of the invention.In Fig. 1,100-1 is the 1st acceptance division, has antenna 101-1, receives RF 102-1 of portion and demodulation section 103-1.100-2 is the 2nd acceptance division, has antenna 101-2, receives RF 102-2 of portion and demodulation section 103-2.105-1,105-2,105-3 are lsb decoders, the 106th, select judging part, and the 107th, selection portion.In addition, give identical label for the part identical with Fig. 6.In addition, an embodiment shown in Figure 1 represents diversity reception portion, and the wireless communication system of having used this diversity reception portion for example is the system identical with wireless communication system shown in Figure 5.And this diversity reception portion can replace with the acceptance division of mobile radio station 530 shown in Figure 5.That is, the lead-out terminal 108 of Fig. 1 is imported in the circuit jockey 536.Thereby, the detailed explanation of omitting the wireless communication system here.
The then action of key diagram 1.At first, in the 1st acceptance division 100-1 of diversity reception portion, the received signal that is imported among the antenna 101-1 is exaggerated in receiving the RF 102-1 of portion, carries out processing such as frequency translation, and is input among the demodulation section 103-1.In demodulation section 103-1, carry out digital demodulation and be that baseband signal is output as complex signal.This output is sent to lsb decoder 105-1 and synthetic portion 104.In lsb decoder 105-1, according to the baseband signal of being imported, for example, be decoded as the original signal when sending to carrying out symbol decision by the signal after the modulation of I-Q orthogonal coordinate, supply among the input terminal A of selection portion 107.
On the other hand, same with above-mentioned the 1st acceptance division 100-1, in the 2nd acceptance division 100-2 of diversity reception portion, the received signal that is input among the antenna 101-2 is exaggerated in receiving the RF 102-2 of portion, carry out the processing of frequency translation etc., and be imported among the demodulation section 103-2.In demodulation section 103-2, carry out digital demodulation and be that baseband signal is output as complex signal.This output is sent to lsb decoder 105-2 and synthetic portion 104.In lsb decoder 105-2, according to the baseband signal that is transfused to, for example, be decoded as the original signal when sending to carrying out symbol decision by the signal after the modulation of I-Q orthogonal coordinate, supply among the input terminal B of selection portion 107.
Add operation etc. is carried out in the output of demodulation section 103-1 and demodulation section 103-2 in synthetic portion 104 synthetic.Synthetic method can be considered multiple, and the high specific synthetic method is for example arranged.This is according to the S/N (signal to noise ratio) or the C/N (carrier-to-noise ratio) that are included in the signal in each acceptance division, and input signal is weighted respectively, and the control weight coefficient is so that the S/N of synthesized output signal or C/N are maximum.Promptly, littler and comprise under the situation of a lot of noises in the received signal of the 1st acceptance division than the received signal of the 2nd acceptance division, the weight coefficient of the 1st acceptance division is obtained less, the weight coefficient of the 2nd acceptance division is obtained bigger, carry out add operation on the basis of this coefficient multiply by.For example, be weighted, the weight coefficient of the 2nd acceptance division is set at " 1 ", the weight coefficient of the 1st acceptance division is set at " 1/100 ".The reason of doing like this is, make the 1st acceptance division of less received signal output P1 littler (P1/100), make output P2 former state (P2) output of the 2nd acceptance division of bigger received signal and synthetic, the advantage of the bit wide that can reduce computing is more than arranged.
The output of synthetic portion 104 is fed among the lsb decoder 105-3.In lsb decoder 105-3, carry out being transformed to pairing symbol to similarly the baseband signal of being imported being carried out symbol decision with above-mentioned, supply among the input terminal C of selection portion 107.In addition, the output of lsb decoder 105-1 and 105-2 also is fed into and selects in the judging part 106.
Select judging part 106 for example to detect signal that takes place from identification of base stations signal generator shown in Figure 5 508 or the signal that takes place from identification of base stations signal generator 512 in the output signal of the 105-1 of portion of self-demarking code always, 105-2, content according to detected identification of base stations signal, control selection portion 107, select some inputs of input terminal A, B, C, export to lead-out terminal 108.
Utilize table 1 and Fig. 9 that the action of selecting judging part 106 is described.Table 1 is the table that is used for illustrating the action of selecting judging part 106.
[table 1]
Table 1
| Select kind | Detected content | Select the chosen content of judging part |
| A | The 1st detects identical identification signal with the 2nd acceptance division | Input terminal C |
| B | The 1st detects different identification signals with the 2nd acceptance division | Input terminal A (identification signal before the direct of travel) |
| C | Detect some identification signals | Input terminal C |
| D | The whichever identification signal does not all detect | Input terminal C |
In table 1, detected content representation is by the detection content of selecting judging part 106 detected identification of base stations signals, and the chosen content of selection judging part is represented the content by the control of the selection portion 107 of selecting judging part 106 controls.In addition, in Fig. 9, transverse axis is represented distance, and the longitudinal axis is represented from the electric field strength E of the electric wave of LCX cable leakage.In addition, 901 expressions are from the electric field strength curve of the leakage electric wave of LCX cable 501, and 902 expressions are from the electric field strength curve of the leakage electric wave of LCX cable 502.L represents the gap of LCX cable, roughly is the length from 1m to several m.In addition, arrangement of antennas as shown in Figure 7, the antenna 101-1 of vehicle 530 ' compares the place ahead that is configured in direct of travel with antenna 101-2, antenna 101-1 and antenna 101-2 are spaced apart roughly about 1m～2m.In addition, be CC1 in the identification signal of establishing base station 503 (being also referred to as identifying information), establish than its near the identification signal (being also referred to as identifying information) of the base station 504 in direct of travel the place ahead under the situation of CC2, under the identical situation of the identifying information that receives by the 1st acceptance division 100-1 and the 2nd acceptance division 100-2 (corresponding to the selection kind A of table 1), promptly if some among identification of base stations signal CC1 or the CC2 then selects judging part 106 to select input terminal C.Consequently, select the output of the synthetic 105-3 of portion promptly to divide the output that assembles.This is that the position of judging vehicle 530 ' is in than the forward time state of moment T1 or than the situation of the time state after T2 leans on constantly in Fig. 8.In Fig. 9, be antenna 101-1 and antenna 101-2 the two be in the regional A or be in any situation in the area B.
On the other hand, under the different situation of the identifying information that receives by the 1st acceptance division 100-1 and the 2nd acceptance division 100-2 (corresponding to the selection kind B of table 1), promptly be arranged under the situation in zone of regional A at the antenna 101-2 that the antenna 101-1 of the 1st acceptance division 100-1 enters into zone, the 2nd acceptance division 100-2 of area B, the 1st acceptance division 100-1 receives identifying information CC2, and the 2nd acceptance division 100-2 receives identifying information CC1.In the case, select judging part 106 to select from input terminal A, promptly from the output signal of the 1st acceptance division 100-1, lsb decoder 105-1.It is characterized in that signal, can obtain the information in the place ahead of direct of travel earlier by the antenna before the reception direct of travel.
And then, except that above-mentioned alternative condition, there is the change of the decay of transfer path or the reception electric field that multichannel causes, also influence the accepting state of each antenna thus.Thereby present inventors have carried out various result of experiment and have been, set the alternative condition of selecting judging part 106 as follows, realize the wireless communication system of the diversity system of use high reliability.Promptly, receiving identifying information CC2, the 2nd acceptance division 100-2 at the 1st acceptance division 100-1 receives under the situation of identifying information CC1 (corresponding to the selection kind B of table 1), anticipation vehicle 530 ' is in the zone boundary really, and vehicle 530 ' just fully enters into the area B of base station 504 at once.Thereby, select judging part 106 to control, to select the input terminal A of selection portion 107.
In addition, under situation about only detecting (corresponding to the selection kind C of table 1) from the some identifying informations among the 1st acceptance division 100-1 and the 2nd acceptance division 100-2, owing to think and significantly reduce from reception electric field that can not detected base station, so selecting judging part 106 controls, to select the input terminal C of selection portion 107, effectively utilize the high specific composite signal.
In addition, under the situation which identifying information all can not receive in from the 1st acceptance division 100-1 and the 2nd acceptance division 100-2 (corresponding to the selection kind D of table 1), owing to think that the 1st acceptance division 100-1 and both reception electric fields of the 2nd acceptance division 100-2 all reduce, so selecting judging part 106 controls, to select the input terminal C of selection portion 107, effectively utilize the high specific composite signal.
As mentioned above, select judging part 106, can realize the wireless communication system that can receive with the accepting state of the best according to content control selection portion 107 from the 1st acceptance division 100-1 and the detected base station identification information of the 2nd acceptance division 100-2.
Utilize Fig. 2 and Fig. 3 that another embodiment of the present invention is described.Fig. 2 is the figure that is used for illustrating the train radio system, and for base station, control device etc., since identical with Fig. 5, so omit detailed explanation.In Fig. 2,201-1,201-2 represent the track of railway, and vehicle 530 ' is at the direction running of track 201-1 upper edge arrow.LCX501-1, LCX501-2, LCX502-1, LCX502-2 represent to be configured in the LCX cable of track 201-1,201-2 both sides, and L1, L2 represent the gap of LCX cable.In addition, LCX501-1, LCX501-2 and identical base station 503 connections have identical identification of base stations signal CC1.In addition, LCX502-1, LCX502-2 and identical base station 504 connections have identical identification of base stations signal CC2.101-1,101-2,101-3,101-4 represent to be located at the antenna on the vehicle 530 ', 202 expression receiving systems.The details of this receiving system is represented in Fig. 3.
Then the receiving system 202 to Fig. 3 describes.In Fig. 3,100-3 constitutes the 3rd acceptance division, and the 3rd acceptance division has antenna 101-3, receives RF102-3 and demodulation section 103-3.In addition, 100-4 constitutes the 4th acceptance division, and the 4th acceptance division has antenna 101-4, receives RF102-4 and demodulation section 103-4.104-1,104-2,104-3 represent synthetic portion, and 105-4,105-5,105-6 represent lsb decoder, and judging part is selected in 301 expressions, 302 expression selection portions.In addition, give identical label for the part identical with Fig. 1.
As shown in Figure 3, the antenna 101-1 and the 101-3 that are positioned at the place ahead of vehicle 530 ' constitute a pair of acceptance division, promptly the 1st acceptance division and the 3rd acceptance division constitute a pair ofly, and each output is undertaken by the synthetic 104-1 of portion that for example high specific is synthetic, its output is supplied to lsb decoder 105-4 and synthesize among the 104-3 of portion.In addition, the 1st acceptance division and the 3rd acceptance division are called the 1st pair of acceptance division.In addition, the antenna 101-2 and the 101-4 that are positioned at the rear of vehicle 530 ' constitute a pair of acceptance division, promptly the 2nd acceptance division and the 4th acceptance division constitute a pair ofly, and each output is undertaken by the synthetic 104-2 of portion that for example high specific is synthetic, its output is supplied to lsb decoder 105-5 and synthesize among the 104-3 of portion.In addition, the 2nd acceptance division and the 4th acceptance division are called the 2nd pair of acceptance division.In the synthetic 104-3 of portion, will be synthetic from the output of the 1st pair of acceptance division and the 2nd pair of acceptance division, for example carry out high specific and synthesize, export to lsb decoder 105-6.Then, be fed into the input terminal A of selection portion 302 by the decoded signal of lsb decoder 105-4, be fed into the input terminal B of selection portion 302 by the decoded signal of lsb decoder 105-5, be fed into the input terminal C of selection portion 302 by the decoded signal of lsb decoder 105-6.
Select judging part 301 by signal, detect identification of base stations signal CC1 and CC2, according to this content control selection portion 302 from lsb decoder 105-4 and 105-5 output.This action is as shown in table 2.In addition, as mentioned above since antenna 101-1 and 101-3 be installed in respect to the direct of travel of vehicle 530 ' vehicle roughly the same position about, so receive identical identification of base stations signal (being also referred to as identifying information).Because same reason, antenna 101-2 and 101-4 also receive identical identification of base stations signal (being also referred to as identifying information).
[table 2]
Table 2
| Select kind | Detected content | Select the chosen content of judging part |
| E | The 1st pair detects identical identification signal with the 2nd pair | Input terminal C |
| F | The 1st detects different identification signals with the 2nd pair | Input terminal A (identification signal before the direct of travel) |
| G | Detect some identification signals | Input terminal C |
| H | The whichever identification signal does not all detect | Input terminal C |
In table 2, detected content representation is by the detection content of selecting judging part 301 detected base station identification information, and the chosen content of selection judging part is represented the content by the control of the selection portion 302 of selecting judging part 301 controls.In addition, the detected content shown in the table 2 is owing to identical with the content of explanation in the table 1, so omit detailed explanation.As Fig. 2 and Fig. 4 are illustrated, will be from signal of base station by the leakage electric wave of paired acceptance division reception from the LCX cable that is laid on the track both sides, synthesize by high specific and to detect signal, so with antenna shown in Figure 1 is that 1 situation is compared, can reduce the decay that in transmission lines, takes place and the influence of multichannel.
Fig. 4 is the expression block diagram of the schematic configuration of an embodiment more of the present invention.In Fig. 4, the 401st, the comparison judging part, the 402nd, comparative voltage is set terminal.In addition, give identical label for the part identical with Fig. 1.Supply with signal to comparing judging part 401 from the RSSI that receives the RF 102-1 of portion, 102-2 (Received Signal Strength Indicator receives electric field).Because this RSSI signal indication receives the intensity of electric field, so for example can use RF (Radio Frequency: Amplifier Gain control signal radio frequency).And, compare in the judging part 401 at this, set the voltage Vth that terminal 402 is set regulation by comparative voltage.
If this relatively action of judging part of explanation, then for example in table 1, selecting under the situation of kind B or selection kind C by selecting judging part 106 to judge, promptly detect under the situation of different identification signals with the 2nd acceptance division the 1st, select input terminal A, detecting under the situation of some identification signals, selecting input terminal C.But, in the embodiment shown in fig. 4, strength signal from the reception electric field that receives the RF 102-1 of portion, 102-2 is fed in the comparison judging part 401, under the high situation of the voltage Vth of the regulation that this strength signal ratio that receives electric field is set by comparative voltage setting terminal 402, be judged as detected signal and have enough electric field strength.Thereby in the case, the judged result that makes comparison judging part 401 is selected the base station signal with enough electric field strength for preferential.But, all have under the situation of enough electric field strength at 2 base station signals, follow the such selection of table 1 and judge.That is, move so that the input terminal that has the base station signal of enough electric field strength from the input terminal A or the some selections the B of selection portion 107.If constitute like this, then can directly detect from the intensity that receives the reception electric field of the 102-1 of RF portion, 102-2, judge whether the received signal from certain base station is best, so have the advantage that the reliability of system further improves.
Below understand the present invention in detail, but the present invention is not limited to 2 acceptance divisions or 2 paired enlarging sections, can certainly be applicable to the enlarging section with a plurality of antennas.In addition, in the above-described embodiments, the mobile radio station that moves in orbit is illustrated, but also is applicable to certainly not in orbit and the moving body that on road etc., travels.In addition, carrying under the situation on the vehicle shown in Figure 2 etc., the case structure that a pair of enlarging section constitutes is fairly simple by constituting, but is not particularly limited in this.
Below understand the present invention in detail, but wireless communication system that the present invention is not limited to put down in writing and wireless communications method can certainly be widely used in above-mentioned wireless communication system and wireless communications method in addition here.
Claims (5)
1, a kind of wireless communication system is characterized in that,
Have a plurality of base stations and the mobile radio station that is connected with above-mentioned base station by radiolink that send different identification of base stations signals;
Above-mentioned mobile radio station has the 1st acceptance division, the 2nd acceptance division, the 1st synthetic portion that the output signal of the 1st acceptance division and the 2nd acceptance division is synthetic at least, the selection portion that the output signal separately of above-mentioned the 1st acceptance division and above-mentioned the 2nd acceptance division and above-mentioned synthetic portion is selected and the selection judging part that detects the identification of base stations signal of above-mentioned a plurality of base stations from the output signal of above-mentioned the 1st acceptance division and the 2nd acceptance division;
The antenna of above-mentioned the 1st acceptance division is positioned at the place ahead of the antenna of above-mentioned the 2nd acceptance division with respect to the moving direction of above-mentioned mobile radio station;
Above-mentioned selection judging part detects respectively under the situation of identical above-mentioned identification of base stations signal in the output signal from above-mentioned the 1st acceptance division and the 2nd acceptance division, selection is from the output signal of the above-mentioned the 1st synthetic portion, detect respectively under the situation of different above-mentioned identification of base stations signals in output signal, control the output signal of above-mentioned the 1st acceptance division that above-mentioned selection portion is selected the antenna that is positioned at the place ahead of above-mentioned mobile radio station from above-mentioned the 1st acceptance division and the 2nd acceptance division.
2, wireless communication system as claimed in claim 1, it is characterized in that, above-mentioned selection judging part is also under situation about detecting from some above-mentioned identification of base stations signals of above-mentioned the 1st acceptance division and the 2nd acceptance division, and all do not detect under the situation of above-mentioned identification of base stations signal in from above-mentioned the 1st acceptance division and the 2nd acceptance division any, control above-mentioned selection portion and select output signal from the above-mentioned the 1st synthetic portion.
3, wireless communication system as claimed in claim 1, it is characterized in that, also possess the comparison judging part that the received electric field strength separately to above-mentioned the 1st acceptance division and the 2nd acceptance division detects, control above-mentioned selection portion according to above-mentioned relatively judgment result.
4, a kind of wireless communication system is characterized in that,
Have a plurality of base stations and the mobile radio station that is connected with above-mentioned base station by radiolink that send different identification of base stations signals;
Above-mentioned mobile radio station has the 1st pair of acceptance division that is made of the 1st acceptance division and the 3rd acceptance division, the 2nd pair of acceptance division that constitutes by the 2nd acceptance division and the 4th acceptance division, the 2nd synthetic portion that the output signal of the 1st acceptance division and the 3rd acceptance division is synthetic, the 3rd synthetic portion that the output signal of the 2nd acceptance division and the 4th acceptance division is synthetic, with the 4th synthetic synthetic portion of the above-mentioned the 2nd synthetic portion and the above-mentioned the 3rd synthetic portion, synthesize the selection portion that portion and the above-mentioned the 3rd synthetic portion and the above-mentioned the 4th output signal separately of synthesizing portion are selected to the above-mentioned the 2nd, and the selection judging part that from the output signal of the above-mentioned the 2nd synthetic portion and the above-mentioned the 3rd synthetic portion, detects the identification of base stations signal of above-mentioned a plurality of base stations;
The antenna of above-mentioned the 1st pair of acceptance division is positioned at the place ahead of the antenna of above-mentioned the 2nd pair of acceptance division with respect to the moving direction of above-mentioned mobile radio station;
Above-mentioned selection judging part detects respectively under the situation of identical above-mentioned identification of base stations signal in the output signal from above-mentioned the 1st pair of acceptance division and above-mentioned the 2nd pair of acceptance division, selection is from the output signal of the above-mentioned the 4th synthetic portion, detect respectively under the situation of different above-mentioned identification of base stations signals in output signal, control the output signal of above-mentioned the 1st pair of acceptance division of antenna that above-mentioned selection portion selects to be positioned at the place ahead of above-mentioned mobile radio station from above-mentioned the 1st pair of acceptance division and the 2nd pair of acceptance division.
5, the wireless communications method in a kind of wireless communication system, this wireless communication system has a plurality of base stations and the mobile radio station that is connected with above-mentioned base station by radiolink that send different identification of base stations signals, above-mentioned mobile radio station has the 1st acceptance division, the 2nd acceptance division and the 1st synthetic portion that the output signal of the 1st acceptance division and the 2nd acceptance division is synthetic at least, above-mentioned wireless communications method is characterised in that
Detect respectively under the situation of identical above-mentioned identification of base stations signal in output signal from above-mentioned the 1st acceptance division and the 2nd acceptance division, selection is from the output signal of the above-mentioned the 1st synthetic portion, detect respectively under the situation of different above-mentioned identification of base stations signals in output signal, select to be positioned at the output signal of above-mentioned the 1st acceptance division of antenna in the place ahead of above-mentioned mobile radio station from above-mentioned the 1st acceptance division and the 2nd acceptance division.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP227432/2005 | 2005-08-05 | ||
| JP2005227432A JP4286817B2 (en) | 2005-08-05 | 2005-08-05 | Wireless communication system and wireless communication method |
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| CN1909406A true CN1909406A (en) | 2007-02-07 |
| CN1909406B CN1909406B (en) | 2010-05-12 |
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| CN2006101107406A Expired - Fee Related CN1909406B (en) | 2005-08-05 | 2006-08-07 | Radio communication system and method therefor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7907582B2 (en) | 2006-10-25 | 2011-03-15 | Ntt Docomo, Inc. | Method and apparatus for access point selection in wireless LAN |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008205984A (en) * | 2007-02-22 | 2008-09-04 | Mitsubishi Electric Corp | Radio communication system |
| JP2009171047A (en) * | 2008-01-11 | 2009-07-30 | Toshiba Tec Corp | Communication terminal and mobile communication system |
| JP4938829B2 (en) * | 2009-07-08 | 2012-05-23 | 東芝テック株式会社 | Wireless communication system |
| JP2014123798A (en) * | 2012-12-20 | 2014-07-03 | Mitsubishi Electric Corp | Receiving device |
| WO2018146795A1 (en) * | 2017-02-10 | 2018-08-16 | 三菱電機株式会社 | On-board wireless device, ground wireless device and wireless train control system |
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| JP3319689B2 (en) * | 1996-06-13 | 2002-09-03 | 三菱電機株式会社 | Diversity receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7907582B2 (en) | 2006-10-25 | 2011-03-15 | Ntt Docomo, Inc. | Method and apparatus for access point selection in wireless LAN |
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| Publication number | Publication date |
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| JP2007043589A (en) | 2007-02-15 |
| JP4286817B2 (en) | 2009-07-01 |
| CN1909406B (en) | 2010-05-12 |
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