WO1999043179A1 - Systeme de communication mobile, station de base, controleur de station de base et procede de communication mobile - Google Patents

Systeme de communication mobile, station de base, controleur de station de base et procede de communication mobile Download PDF

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Publication number
WO1999043179A1
WO1999043179A1 PCT/JP1998/004769 JP9804769W WO9943179A1 WO 1999043179 A1 WO1999043179 A1 WO 1999043179A1 JP 9804769 W JP9804769 W JP 9804769W WO 9943179 A1 WO9943179 A1 WO 9943179A1
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WO
WIPO (PCT)
Prior art keywords
base station
mobile
transmission quality
mobile communication
base stations
Prior art date
Application number
PCT/JP1998/004769
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English (en)
Japanese (ja)
Inventor
Shuichi Miyazaki
Miyoshi Ueno
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Publication of WO1999043179A1 publication Critical patent/WO1999043179A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity

Definitions

  • Mobile communication system base station, base station controller, and mobile communication method
  • the present invention relates to a mobile communication system, a base station, a base station control device, and a mobile communication method using a site diversity technique suitable for improving the transmission quality of communication information.
  • TDMA Time Division Multiple Access
  • MMAC Mobile Multimedia Mobile Access Communication System
  • ITS Intelligent Transport Systems
  • site diversity As a countermeasure against this shadowing, a technique called site diversity is used.
  • the art is known. This is to ensure visibility between the mobile and base stations
  • Japanese Patent Application Laid-Open No. Hei 9-284208 discloses a code division multiple access (CDMA) system from a plurality of base stations to a mobile switching center. A proposal has been made to improve communication quality by reproducing one packet data from the packet data sent by the mobile switching center.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • the site diversity system in the conventional time division multiple access (TDMA) system uses different frequencies for each base station, and the mobile station has only one receiver. .
  • TDMA time division multiple access
  • the mobile station switches the reception frequency according to each base station, receives radio waves,
  • the frequency switching performed by the mobile station is generally performed by switching the frequency of the synthesizer, but the switching of the frequency requires about 600 s to 700 s.
  • An object of the present invention is to provide a mobile communication system, a base station, and a base station control device capable of solving the problems of the related art and transmitting high-quality communication information by a simple method. Furthermore, it is an object of the present invention to solve the problems of the related art and to provide a mobile communication method capable of transmitting high-quality communication information by a simple method.
  • the above object is achieved by connecting a plurality of base stations arranged at different locations to communicate with a mobile station, a base station controller connected to the plurality of base stations, and a base station controller.
  • Mobile base station each base station receives communication information of the same frequency transmitted from the mobile station, and the base station controller transmits a plurality of communication information based on the transmission quality of the communication information received by each base station.
  • One base station is selected from the base stations, communication information from the selected base station is transmitted to the mobile switching network, and the selected base station is obtained from the mobile switching network via the base station controller.
  • Communication is achieved by a mobile communication system configured to transmit information to a mobile station.
  • the detection of transmission quality is performed in each base station or base station controller.
  • the detection data of the transmission quality may be used directly, but it may be stored in a storage device once and subjected to processing such as a change history or weighting.
  • the transmission quality is specifically determined based on the frame, error, and rate of the communication information.
  • the base station controller selects a station having the best transmission quality among a plurality of base stations. If each base station has a plurality of transmitting and receiving devices connected to the sector antenna, the transmitting and receiving device that has received the communication information with the best transmission quality as a sector is selected.
  • the base station includes a receiving unit that receives communication information transmitted from the mobile station, a transmission quality detecting unit that detects the transmission quality of the received communication information, and a reporting unit that reports the detected transmission quality to the base station controller.
  • the receiving unit is controlled by a control signal of one of a receiving timing control unit that controls to receive the communication information and an interception timing control unit that controls to intercept the communication information.
  • the base station reports a plurality of receiving units connected for each sector antenna, a control unit that detects the transmission quality of the communication information received by each receiving unit, and the detected transmission quality to the base station control device. And an interface unit for performing the operation.
  • the base station controller compares the transmission quality of communication information detected by the plurality of base stations, and designates one of the plurality of base stations based on an output from the comparison unit.
  • a base station designating unit To this, a storage unit for storing the transmission quality is added, and the comparison unit compares the transmission quality read from the storage unit, the change history thereof, or the result of processing such as weighting. It can also be done.
  • a plurality of base stations receive communication information on a single frequency transmitted from a mobile station, and each of the base stations detects transmission quality from the received communication information.
  • One base station is selected from a plurality of base stations based on the detected transmission quality, and downlink communication information is transmitted from the selected base station to the mobile station.
  • the downlink communication information is transmitted in a time slot different from the time slot used in the uplink communication information.
  • the base station installation position information is stored, and when communication with each of the base stations is disabled, the base station closest to the currently selected base station other than the base stations is installed. Communication can be continued by selecting from location information.
  • FIG. 1 is a diagram showing an embodiment of a TDMA mobile communication system according to the present invention
  • FIG. 2 is a diagram showing a configuration example of a mobile station MS
  • FIG. 3 is a configuration of a base station BS.
  • FIG. 4 is a diagram showing an example of a configuration of a base station controller BSCE
  • FIGS. 5 and 5 are diagrams showing a basic configuration of a TDMA frame used in an embodiment of the present invention.
  • FIG. 6 is a diagram for explaining a method of allocating a time slot in a TDMA frame according to an embodiment of the present invention.
  • FIG. 7 is an embodiment of a TDMA mobile communication system according to the present invention.
  • FIG. 1 is a diagram showing an embodiment of a TDMA mobile communication system according to the present invention
  • FIG. 2 is a diagram showing a configuration example of a mobile station MS
  • FIG. 3 is a configuration of a base station BS.
  • FIG. 4 is a diagram showing an example of
  • FIG. 8 is a diagram illustrating another embodiment of the TDMA mobile communication system according to the present invention
  • FIG. 9 is a diagram illustrating another embodiment of the present invention.
  • FIG. 10 is a diagram showing a basic configuration of a TDMA frame used.
  • FIG. 10 is a diagram showing a base station position management table used in another embodiment of the present invention. Is a diagram for explaining the table, first 1
  • FIG. 12 is a diagram for explaining the relationship between the basic configuration of a TDMA frame used in another embodiment of the present invention and a transmission quality management table.
  • FIG. 12 is a diagram showing a TDMA mobile unit according to the present invention.
  • FIG. 13 is a diagram for explaining the operation of another embodiment of the communication system, FIG.
  • FIG. 13 is a diagram showing another embodiment of the TDMA mobile communication system according to the present invention
  • FIG. FIG. 15 is a diagram illustrating a method of allocating a time slot in a TDMA frame according to another embodiment of the present invention.
  • FIG. 15 is a diagram illustrating an example of a transmission quality management table according to another embodiment of the present invention.
  • FIG. 16 is a diagram for explaining a configuration of a base station BS according to another embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a diagram showing an embodiment of a TDMA mobile communication system according to the present invention.
  • the person HU 1 performs communication using the mobile station MS 11, and the person HU 2 performs communication using the mobile station MS 12.
  • Person HU 3 is a pedestrian, which can hinder communication depending on where he or she moves.
  • the base stations BS1 and BS2 are arranged avoiding the trees TR1 to TR6, respectively, so as not to obstruct communication.
  • the base stations BS 1 and BS 2 are connected to a base station controller BSCE (Base Station Control 1 Equipment) via a digital transmission line 31.
  • the base station controller BSCE is connected to a mobile switching network (not shown) via a digital transmission line 32.
  • the digital transmission lines 31 and 32 are used as transmission lines for control signals and communication information.
  • the mobile station MS and the base station BS use a single frequency f1, the number of mobile stations may be increased by increasing the single frequency to f2, f3,... Can be.
  • FIG. 2 is a diagram showing a configuration example of the mobile station MS.
  • the mobile station MS includes a transmitting / receiving section 41 having a transmitting section 41a and a receiving section 41b, an antenna 44 connected to the transmitting / receiving section 41, and switches 42a and 42b.
  • a control unit 43 for controlling the transmission / reception unit 41 and the switch unit 42 so that communication is performed at a predetermined time slot (s10t).
  • the signal from the control section 43 is modulated by the transmission section 41 a via the switch 42 a and transmitted from the antenna 44.
  • the signal received by the antenna 44 is sent to the receiving unit 41b, where it is demodulated, passed through the switch 42b, and processed in the control unit 43 such as an image or sound. .
  • FIG. 3 is a diagram showing a configuration example of the base station BS.
  • the base station BS includes a transmitting / receiving unit 51 having a transmitting unit 51a and a receiving unit 51b, an antenna 54 connected to the transmitting / receiving unit 51, and switches 52a and 52b.
  • the control unit 53 includes a transmission quality detection unit 53a, a reception timing control unit 53b, and an eavesdropping timing control unit 53c, as illustrated.
  • a signal obtained through the interface section 55 is subjected to TDM Time Division Multiplex processing by the control section 53 and the switch 52a, and is modulated by the transmission section 51a. It is amplified and transmitted from antenna 54.
  • the signal received by the antenna 54 is sent to the receiving unit 51b, demodulated there, and sent to the control unit 53 via the switch 52b.
  • the control unit 53 receives the signal in the transmission quality detection unit 53a. Detects the transmission quality of the received signal, for example, frame error rate FER (Frame Error Rate).
  • the interface unit 55 performs an interface conversion on the detected transmission quality, and sends it to the base station controller BSCE via the digital transmission line 31.
  • the global positioning system GPS56 absorbs the delay time difference of the transmission line caused by the difference in the transmission line length of the digital transmission line 31 connected to each base station BS, and synchronizes the base stations BS. It is provided to take.
  • the base station BS establishes a clock in accordance with the time signal of the GPS 56 to synchronize the base stations BS.
  • FIG. 4 is a diagram showing a configuration example of a base station controller BSCE.
  • the base station controller BSCE includes a control unit 60 and an interface unit 64.
  • the control unit 60 compares the transmission quality transmitted from each base station, for example, the above-mentioned FERR, the comparison unit 61, and the selection unit that selects the signal having the best transmission quality obtained by the comparison unit 61.
  • a switching section 62 and a base station designating section 65 for designating one base station based on the output from the comparing section 61 are provided.
  • the interface section 64 sends the signal selected by the selection switching section 62 to the mobile switching network via the digital transmission line 32, and conversely sends the signal from the mobile switching network to the control section 60.
  • FIG. 5 is a diagram showing a basic configuration of a TDMA frame used in the present embodiment.
  • this TDMA frame has a frame length of 2.5 ms and a 16-slot (s10t) configuration.
  • These time slots can be used for either upstream communication frames (UW: Up Ward) or downstream communication frames (DW: Own Ward).
  • UW Up Ward
  • DW Own Ward
  • eight slots tl to t8 are allocated to the upstream communication frame
  • eight slots t9 to tl6 are allocated to the downstream communication frame.
  • Fig. 6 illustrates the method of allocating time slots in a TDMA frame.
  • the TDMA frame of the same frequency f1 is divided into 16 slots tl to t16, and for uplink communication frames, the slots tl to t4 are assigned to the base station BS1.
  • base station BS1 can accommodate four subscribers of mobile stations MS11 to MS14
  • base station BS2 can accommodate four subscribers of mobile stations MS21 to MS24.
  • the base station BS1 has a function of intercepting the slots t5 to t8 of the uplink communication frame allocated to the base station BS2, as indicated by the dotted arrow in the figure.
  • the base station BS2 has a function of intercepting slots t1 to -t4 of uplink communication frames allocated to the base station BS1.
  • the site diversity control according to the present invention is performed in the following procedure.
  • the mobile station MS11 used by the human HU 1 is the slot in Fig. 6! At 1, transmit uplink signal ⁇ to base station BS 1.
  • Base station BS 1 receives uplink signal ⁇ ⁇ at slot t 1 and generates signal a based on this signal.
  • the base station BS2 intercepts the uplink signal ⁇ ⁇ at slot t1 and creates a signal b based on this.
  • the slot to be intercepted is notified to each base station BS in advance from the base station controller BSCE.
  • the base station BS1 transmits the signal a, and the base station BS2 transmits the signal b to the base station controller BSCE.
  • the base station controller BSCE determines the FER (F 1 a me Error Rate) is compared by the comparison section 61 shown in FIG. 4, and the slot having the best transmission quality is selected by the selection switching section 62.
  • the base station controller BSCE sends a signal from the selected slot to the mobile switching network via the digital transmission line 32 via the interface unit 64.
  • the base station controller BSCE gives the right to the base station BS2 to transmit a signal to the mobile station MS11.
  • the base station BS2 transmits a communication signal from the mobile switching network to the mobile station MS11 at slot t9 as a downlink signal 2, as shown in FIG.
  • the mobile station MS11 receives the downlink signal 1 from the base station BS2 at slot t9, as shown in FIG.
  • the uplink communication flow from the mobile station MS11 is described.
  • the base station BS is selected by the above-mentioned procedure (1) to (6), and the communication information is transmitted to the base station BS selected by the procedure (7) to (8) in the downward communication frame.
  • the mobile station MS 11 can select a base station having the best radio transmission quality, prevent a radio link disconnection due to shadowing, and maintain good communication.
  • the frequency use efficiency is improved and the traffic capacity is also increased.
  • the site diversity is configured by using two base stations, base stations BS1 and BS2, but the number of diversity branches is not limited to this and may be two or more.
  • the number of diversity branches is not limited to this and may be two or more.
  • FIG. 8 is a diagram showing another embodiment of the TDMA mobile communication system according to the present invention.
  • the person H U 1 uses the mobile station MS 11.
  • the vehicle C AR may interfere with communication depending on its movement position.
  • the base stations BS1 to BS4 are arranged avoiding the buildings BILL1 to BILL3 so as not to obstruct communication.
  • the base stations BS1 to BS4 are connected to the base station controller BSCE via the digital transmission path 31.
  • the base station controller BSCE includes a base station position management table 661, and a storage unit DB66 for holding a transmission quality management table 662, and a mobile switching network (not shown) via a digital transmission path 32. It is connected to the.
  • the digital transmission paths 31 and 32 are used as transmission paths for control signals and communication information.
  • the storage unit DB 66 is located in the BSCE, but is connected to the outside of the BSCE via the interface unit 64 and another B It may be shared with the SCE.
  • the mobile station MS and the base station BS use a single frequency f1, but the number of mobile stations can be increased by increasing the single frequency to f2 and f3.
  • FIG. 9 is a diagram showing a basic configuration of a TDMA frame used in another embodiment of the mobile communication system according to the present invention shown in FIG.
  • This TDMA frame has a frame length of 10 ms and has a 64-slot (siot) configuration. These time slots can be used for either upstream communication frames (UW: Up Ward) or downstream communication frames (DW: Own Ward).
  • UW Up Ward
  • DW Own Ward
  • the TDMA frame of the same frequency f1 is divided into 64 slots tl to t64, and 32 slots of the upstream communication frames tl to t32 are divided into eight slots by the base station BS. Distribute equally between 1 and BS 4.
  • 32 slots from t33 to t64 are equally distributed to the base stations BS1 to BS4 in 8 slots.
  • each of base stations BS1 to BS4 can accommodate up to eight subscribers.
  • eight slots are equally distributed to each base station, but it is not always necessary to equally distribute the slots.
  • base stations installed in locations where mobile stations concentrate are allocated more slots to accommodate base stations. It is also possible to increase the number.
  • it is not necessary to equally distribute the slots for uplink and downlink and a system mainly configured with a downlink for data communication adopts an asymmetric configuration with an increased number of downlink slots.
  • FIG. 10 is a diagram for explaining a base station position management table 661 provided in the storage unit DB 66.
  • the base station position management table 661 records base station installation positions, such as base station numbers and latitudes and longitudes, which are determined in advance when base stations are installed. That is, each of the base stations BS1 to BS4 has a latitude of LAT1 to LAT4 and a longitude of L0N :! ⁇ L ON 4 respectively.
  • FIG. 11 is a diagram for explaining the relationship between the basic configuration of a TDMA frame used in the mobile communication system of FIG. 8 and the transmission quality management table 662.
  • the FER sent from each base station is recorded in the transmission quality management table 626 at the position of the corresponding slot number.
  • slots in which no FER is recorded on the transmission quality management table 662 indicate communication slots at the time of initial setting
  • slots with hatching indicate interception slots at the time of initial setting. Show.
  • mobile station MS 11 used by person H U 1 transmits uplink signal ⁇ ⁇ to base station BS 1 at slot t 1 in FIG.
  • Base station BS1 receives uplink signal ⁇ ⁇ at slot t1, and generates signal a based on this signal.
  • three branch site diversity is formed by using base stations BS 1 to BS 3, and base stations BS 2 and BS 3 transmit uplink signals in slot t 1.
  • the base station that intercepts the communication can be selected in advance from the base station with the shortest distance to the base station BS1, based on the base station installation position information in FIG. 2 to BS 3.
  • the number of branches of the site diversity that is, the number of intercepted base stations (here, 3) is managed in advance by the base station controller BSCE by initial setting. It is also possible to adopt a configuration in which all base stations always receive signals and the number of site diversity is fixed to the maximum value without selecting a base station.
  • the base station BS1 transmits the signal a
  • the base station BS2 transmits the signal b
  • the base station BS3 transmits the signal c to the base station controller BSCE.
  • the base station controller BSCE stores the FERRs of the received signals a, b, and c in the transmission quality management table 662 managed by the storage unit DB66 shown in FIG.
  • the transmission quality management table 662 has, for example, the configuration shown in FIG.
  • the transmission quality management table 662 records a base station number, a slot number, FERR, and the like. The recorded FER can be weighted in consideration of other conditions such as the location of the base station BS.
  • the comparison unit 61 compares the FER on the transmission quality management table 66 2, and selects the slot with the best transmission quality by the selection switching unit 62.
  • the base station controller BSCE sends the signal of the selected slot to the mobile switching network via the digital transmission line 32 via the interface unit 64.
  • the base station controller BSCE selects, for example, the signal c
  • the base station BS3 grants the right to transmit a signal from the slot t33 to the mobile station MS11.
  • the base station BS 3 transmits a communication signal from the mobile switching network to the mobile station MS 11 at slot t33 as a downlink signal 2, as shown in FIG.
  • the mobile station MS 11 receives the down signal ⁇ ⁇ from the base station BS 3 at slot t33.
  • the base station controller BSCE determines the base station closest to the base station that was communicating with the mobile station based on the base station installation position information on the base station position management table 661, shown in FIG. Among them, the base station (BS 4 in this case) that was not selected as the interception base station is selected, and the base station BS 4 is used to receive the uplink signal 3.
  • the base station BS is selected by the above-described procedures (1) to (8) by receiving the uplink communication frame from the mobile station MS11, and the base station BS is selected from (9).
  • the communication information is transmitted from the base station BS selected in the procedure (10) to the mobile station MS11.
  • the probability of shadowing can be reduced by newly assigning another base station.
  • four base stations are accommodated in a TDMA frame of 10 ms (64 s 1 ot) allocated to each base station with eight slots in each of the uplink and downlink, but the number of slots allocated to each base station is reduced.
  • the number of branches for site diversity (the number of base stations) can be increased.
  • the mobile station MS 11 can select a base station having the best wireless transmission quality, prevent a wireless link disconnection due to shadowing, and maintain good communication.
  • the frequency use efficiency is improved, and the traffic capacity is also increased.
  • FIG. 13 is a diagram showing another embodiment of the TDMA mobile communication system according to the present invention.
  • the antennas of the base stations BS1 and BS2 are composed of sector antennas sectl to secct4, whereby the directivity of the antenna is directed to a specific direction. The reason for doing this is as follows.
  • the transmission quality of communication may be degraded even in a situation where shadowing does not occur.
  • some radio waves transmitted from the mobile station MS directly reach the base station BS 1 via pass 1, while others are reflected on the bus BUS 1 via pass 2 and then transmitted to the base station BS 1.
  • the signals transmitted from the mobile station MS at the same time are received by the base station BS1 at different times because the propagation path lengths of the two are different.
  • the antenna is sectorized to prevent interference in directions other than the directional direction of the antenna, and to remove interference waves arriving from directions other than the directional direction.
  • the sectorization of this type of antenna is described in, for example, “Digital Mobile Communication System”, published by Tokyo Denki University Press, February 20, 1999.
  • the antennas of the base stations BS1 and BS2 are provided with sectors sec1 to sec4 covering 90 degrees, respectively, to cover the entire horizontal plane.
  • the radio wave transmitted from the mobile station MS arrives at sect 1 of BS 1 via pass 1, sect 2 of BS 1 via pass 2, and sect 2 of BS 2 via pass 3. Reach sect 3 respectively.
  • the sector that has received the signal with the best transmission quality is selected.
  • FIG. 14 is a diagram for explaining a time slot allocation method in a TDMA frame according to the present invention.
  • the TDMA frame of the same frequency f1 is divided into eight slots tl to t8, and the upstream communication frame is transmitted through slots t1 to t4 and the downstream communication Slots t5 to t8 are allocated for the service frame.
  • one mobile station MS can be accommodated in each slot.
  • four mobile stations MS1 to MS4 can be accommodated.
  • the uplink transmission signal of each mobile station MS is transmitted from each sector sectl to sect 4 of the base station BS1.
  • each sector sectl to sect 4 of the base station BS2 each sector sectl to sect 4 of the base station BS2.
  • FIG. 15 is an example of a transmission quality management table AT B 662 for each hour according to the present invention.
  • FER frame error
  • FIG. 16 is a diagram for explaining the configuration of the base station BS in the present invention.
  • the sector antennas ANT1 to ANT4 forming the sectors secct1 to secct4 are individually transmitting / receiving devices TRX :! ⁇ Connected to TRX 4.
  • the transmission / reception devices TRX1 to TRX4 consist of a transmission / reception switch tSW, a transmitter TX, a modulator MOD, a receiver RX, and a demodulator DEM.
  • Sector antennas ANT1 to ANT4 are shared for transmission and reception by the transmission / reception switch SW.
  • the transmission / reception signals are subjected to signal processing in a TDMA control circuit 201 having a transmission quality detection unit.
  • the TDMA control circuit 201 detects transmission qualities from the respective sectors sectl to secct4, and transmits these from the interface unit 202 to the base station controller BSCCE via the digital transmission path 31.
  • the site diversity control according to the present invention is performed in the following procedure.
  • the mobile station MS transmits the up signal 1 at slot t1 in FIG.
  • the base station controller BSCE creates the transmission quality management table 662 shown in FIG. 15 based on the transmission quality.
  • the frame error rate (F) F
  • ER is the transmission quality standard.
  • the sector secect of the base station BS having the best transmission quality is determined and selected.
  • sector sect 1 of base station BS 1 transmits a communication signal from the mobile switching network to mobile station MS at slot t5 as downlink signal 2, as shown in FIG. .
  • the transmission signal from the sector sect 1 of the base station BS 1 to the mobile station MS is directly propagated through the pass 1, so that the influence of the reflection from the bus B US 1 is No, it is well received by the mobile station MS.
  • the base station antenna as a sector antenna in this way, it is possible to reduce the adverse effects of reflected waves from scatterers such as buses and buildings, and to suppress deterioration of transmission quality. Furthermore, since the gain of the base station antenna can be increased by sectorization, the transmission power can be reduced, which is effective in reducing the power consumption of the base station. In addition, it is more resistant to interference from other stations. In addition, an increase in the base station antenna gain can reduce the size of the antenna of the mobile station and the transmission output, which has a great effect on reducing the size and power consumption of the mobile station.
  • the base station antenna has a four-sector configuration, but by further increasing the number of sectors, the adverse effect of the reflected wave is further reduced, and the transmission power is further reduced. Can be reduced. In addition, it is possible to further reduce the adverse effects of reflected waves by adaptively changing the tilt angle and directivity of the antenna.
  • the site diversity can be easily configured without switching the frequency, and the problem that information is lost during the frequency switching process can be solved. Further, since the same frequency is shared by a plurality of base stations BS, the device configuration is simplified, and the cost can be reduced. Furthermore, since frequency switching is not required, it can be applied to services that require real-time performance such as video communication. By adaptively changing the number of branches of the site diversity, shadowing can be suitably avoided.
  • a mobile communication system As described above, according to the present invention, it is possible to obtain a mobile communication system, a base station, and a base station control device capable of transmitting high-quality communication information by a simple method.
  • a simple mobile communication method capable of transmitting high-quality communication information can be provided.

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Abstract

L'invention concerne un système de communication mobile entre une station mobile et une station de base dans lequel les intervalles de temps amont et aval sont attribués à une séquence TDMA utilisant une seule fréquence (f1). Lorsqu'une station (MS11) mobile émet un signal (1) amont simultanément à une pluralité de stations (BS1, BS2) de base installées à des emplacements différents pendant un intervalle (t1) de temps, les stations de base (BS1, BS2) mesurent la qualité de transmission du signal (1) de manière indépendante. La station de base qui présente la meilleure qualité de transmission mesurée par un contrôleur (BSCE) de station de base est alors sélectionné et émet un signal (2) aval en direction de la station mobile (MS11) durant un intervalle de temps (t9). On obtient ainsi un système de communication mobile permettant de réaliser des transmissions de haute qualité.
PCT/JP1998/004769 1998-02-20 1998-10-21 Systeme de communication mobile, station de base, controleur de station de base et procede de communication mobile WO1999043179A1 (fr)

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Cited By (1)

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US11924708B2 (en) 2018-12-05 2024-03-05 Sony Group Corporation Information processing device and information processing method

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