JP2006333504A - Base station device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base station device capable of flexibly and efficiently storing a large number of terminals for each sector. <P>SOLUTION: The base station device is used for a wireless communication system in which communication is executed in-between a plurality of terminal stations via antennas a1-a3 for each sector with a TDMA system after dividing one cell into a plurality of sectors. The device includes a part 4 for distributing and modulating for each frequency, which respectively modulates respective channel data to be transmitted by distributing them corresponding to respective time slots of a plurality of lines (1)-(3) for each transmission frequency, a part 13 for distributing and compositing for each sector, which distributes respective modulated signals f<SB>1</SB>-f<SB>3</SB>to the lines (4)-(6) for each sector specified corresponding to the time slots T<SB>1</SB>-T<SB>3</SB>beforehand and composites them for each line, and a channel connection control part 20 for generating each distribution control information of the lines for each transmission frequency and the lines for each sector corresponding to a request of channel connection/disconnection. The device is connectable with the terminal stations by separating the sector from the transmission frequency and the time slot. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a base station apparatus, and more particularly, to a base station of a radio communication system that divides one cell into a plurality of sectors and communicates with a plurality of terminal stations via a TDMA (Time Division Multiple Access) system via an antenna for each sector. Relates to the device.

  In recent years, with the increase in the number of terminal subscribers such as mobile communication, the base station is required to expand the terminal station capacity. In order to efficiently expand the terminal station capacity, it is necessary not only to effectively use frequencies but also to reduce the size and power consumption of base station equipment.

  FIG. 19 is a diagram for explaining the prior art. FIG. 19A shows a partial configuration of a conventional mobile communication system based on the TDMA system. In the figure, reference numeral 60 denotes a mobile switching center which is connected to a public network and accommodates a plurality of base station apparatuses BS, 50 is a conventional base station apparatus (BS), and a1 to a3 cover communication areas of sectors 1 to 3. A directional antenna, 100 is a cell (service area) composed of sectors 1 to 3, and A to G are mobile terminals.

The conventional BS 50 fixedly assigns frequencies f _{1 to} f ₃ to sectors 1 to 3, respectively. That is, terminal A in sector 1 is connected to BS 50 by frequency f ₁ , terminals B and C in sector 2 are connected by frequency f ₂ , and terminals D to F in sector 3 are connected to BS 50 by frequency f ₃ .

FIG. 19B shows a timing chart of downlink communication (BS → terminal) in the BS 50. Here, the transmission slots T _{1 to} T ₃ are used as a call channel for transmitting call data, and the transmission slot T ₄ is used as a control channel for transmitting information such as a connection status of the terminal and a connection request. And In this example, terminal A in sector 1 is in time slot T ₁ at frequency f ₁ , terminals B and C in sector 2 are in time slots T ₁ and T ₂ at frequency f ₂ , and terminals D to F in sector 3 are in frequency It is accommodated in each of the time slots T _{1 to} T ₃ of f ₃ . In this way, one cell of the BS 50 can simultaneously accommodate a total of nine terminals, each having a maximum of three in each of the sectors 1 to 3 (that is, the frequencies f _{1 to} f ₃ ).
Japanese Patent Laid-Open No. 10-126846 JP 08-186864 A

However, if it is attempted to accommodate the fourth terminal G in the sector 3 in the above situation, the conventional BS 50 cannot accommodate the terminal G because there is no space in the time slot of the frequency f ₃ . If the terminal G is to be accommodated forcibly, it is necessary to increase the frequency used per sector in the conventional method, which not only makes effective use of the frequency, but also increases the circuit scale, power consumption and cost of the apparatus. become.

  The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a base station apparatus capable of accommodating a large number of terminals flexibly and efficiently for each sector.

The above problem is solved by the configuration of FIG. That is, the base station apparatus of the present invention (1) is a wireless communication system that divides one cell into a plurality of sectors 1 to 3 and communicates with a plurality of terminal stations by the TDMA method via antennas a1 to a3 for each sector. In the base station apparatus, each channel data to be transmitted is distributed corresponding to each time slot of a plurality of transmission frequency routes 1) to 3), and each frequency modulation modulation unit 4 modulates each, and each modulation signal f _1. ˜f ₃ is distributed to sector-specific routes 4) to 6) defined in advance corresponding to time slots T _{1 to} T ₃ and these are combined for each route, and channel connection / disconnection unit 13 And a channel connection control unit 20 for generating distribution control information for each transmission frequency route and each sector route according to the request.

In the present invention (1), a terminal in a certain sector can be accommodated in any transmission frequency and time slot with a simple configuration in which the sector and the transmission frequency and time slot can be disconnected and connected. For example, in the situation of FIG. 19A, as shown in FIG. 1, the terminals D to F basically located in the sector 3 are basically connected to the time slots T ₁ to T ₃ of the transmission frequency f ₃ as in the prior art. For the fourth terminal G that can be accommodated in T ₃ and located in sector 3, this is simultaneously performed without interference with terminals D to F using time slot T ₃ of transmission frequency f _1. Can be accommodated. As described above, according to the present invention (1), it is possible to flexibly cope with a temporary increase in the number of terminals located in a certain sector, and in an extreme case, all sectors are concentrated in a user concentrated sector. It is also possible to allocate an empty slot, and thus the existing frequency resource can be used to the maximum extent without increasing the circuit scale, power consumption, and the like.

Preferably, in the present invention (2), in the present invention (1), the received signals f ₁ ′ to f ₃ ′ on the sector-specific routes 4) ′ to 6) ′ are combined to generate a plurality of received frequency-specific methods. Sector synthesis / distribution unit 15 that distributes to paths 1) ′ to ₃ ) ′, and frequency signals f ₁ ′ corresponding to reception frequency paths 1) ′ to ₃₎ ′ from distribution signals f ₁ ′ to f ₃ ′, respectively. And a frequency-specific demodulator 5 that extracts / f ₂ ′ / f ₃ ′ and demodulates it corresponding to the time slot.

  Therefore, terminals in a certain sector can be accommodated in both directions with a desired transmission / reception frequency and transmission / reception time slot pair.

  Also preferably, in the present invention (3), in the present invention (1) or (2), the channel connection control unit 20 vacates the transmission frequency specific routes 1) to 3) when a new channel connection request is made. Each distribution control information is generated so as to connect the slot to the existing sector of the connection requesting terminal.

For example, in the situation of FIG. 19A, as shown in FIG. 1, the time slots T _{1 to} T ₃ of the transmission frequency route 3) (sector 3) are already used by the terminals D to F. Yes. However, according to the present invention (3), when a new channel connection request is made for the terminal G located in the sector 3, the channel connection control unit 20 uses the input channel data G for the empty transmission frequency route 1). Each distribution control information is generated so as to distribute to the slot T ₃ and distribute the modulation signal G of the transmission frequency f ₁ to the sector 3 at the timing of the time slot T ₃ . Therefore, it is possible to effectively use the frequency and flexibly cope with a temporary increase in the number of terminals located in the sector 3.

  Preferably, in the present invention (4), in the present invention (1) to (3), a failure information collecting unit (not shown) for collecting failure information of each device in the apparatus is provided, and the channel connection control unit 20 is Based on the failure information of the failure information collection unit, a time slot that is not affected by the failed device is used in each time slot of the route according to the transmission frequency.

  Therefore, even if an expensive redundant configuration is not adopted, communication can be continued properly by reconnecting or newly connecting channels and frequencies so that the failure of each device in the apparatus is not affected by these failed devices. It can be started, and the existing communication equipment can be used effectively.

Preferably, in the present invention (5), in the present inventions (1) to (4), a power supply control unit (not shown) that performs on / off control of power supply to each device in the apparatus according to an instruction from the channel connection control unit 20. The channel connection control unit 20 instructs to turn off the power supply of each device in the apparatus that is not using the transmission and / or reception frequency route. Therefore, the power consumption of the base station apparatus can be reduced.

  Preferably, in the present invention (6), in the above-mentioned present inventions (1) to (5), the channel connection control unit 20 sets the time so as to be filled sequentially from any one of the time slots of the route according to the transmission frequency. Use slots.

Time, for example the terminal A of the sector 1 frequency (f _1, f ₁ ') is accommodated in the time slot (T _1, R _1), and the sector 2 of the terminal B, C frequencies (f _1, f _1') The slots are accommodated in slots (T ₂ , R ₂ ) and (T ₃ , R ₃ ). If there are no other terminals in the cell, the transmission / reception frequency-specific routes 2), 3), 2) ′, and 3) ′ are not used. Therefore, by turning off the power supply to these unused devices, the power consumption of the base station apparatus can be greatly reduced.

  As described above, according to the present invention, the base station apparatus can flexibly and efficiently accommodate a large number of terminals for each sector with a simple configuration, effectively use the frequency in the TDMA communication system, and accommodate the expanded number of subscribers. The place that contributes to the improvement of communication service and service reliability is extremely large.

  Hereinafter, a plurality of preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the same reference numerals denote the same or corresponding parts throughout the drawings.

FIG. 2 is a block diagram of the base station apparatus according to the first embodiment, and shows a case of 3 sectors per cell. In the figure, 11 is a channel multiplexing unit for multiplexing each channel data of the main signal downlink (switching station → base station), and 12 is each time of a plurality of routes 1) to 3) according to a plurality of transmission frequencies for each channel data multiplexed. Frequency-separated signal demultiplexing unit that distributes to slots, CM1 is a control memory that stores distribution control information, MOD1 to MOD3 are modulation units based on (π / 4) shift QPSK, etc., and TFCV1 to TFCV3 are intermediate frequency signals IF (= F _i ) a frequency converter for converting the radio frequency signal RF (= f _{1 to} f ₃ ) into a sector-specific path 4) to 6 which is defined in advance for each radio frequency signal f _{1 to} f ₃ corresponding to the time slot. ) And synthesize these by route, D1 to D3 are distributors with switches, M1 to M3 are synthesizers, and CM2 stores distribution control information defined for time slots. Control memory, HPA1～HPA3 high output power amplifier, C1 to C3 antenna duplexer, a1 to a3 are directional antenna provided in the sector 1-3 correspond.

Further, LNA1 to LNA3 are low-noise amplifiers that amplify the reception frequency signals f ₁ ′ to f ₃ ′ from the respective antennas a1 to a3 of the sector-specific routes 4) ′ to 6) ′, and 15 is a sector-specific route 4). Sector synthesis / distribution unit for synthesizing each reception frequency signal of '-6)' and distributing it to a plurality of paths 1) '-3)' according to reception frequency, M4 is its synthesiser, D4 is a distributor, RFCV1 ˜RFCV3 is a frequency conversion unit that converts the radio frequency signals f ₁ ′ to f ₃ ′ into intermediate frequency signals F ₁ ′ to F ₃ ′, and BPF _{1 to} BPF ₃ are center frequencies F ₀ = F _i ′ (= F _i BEM), DEM1 to DEM3 are (π / 4) shift QPSK demodulator, 16 is a signal multiplexer that multiplexes the demodulated data corresponding to the time slot, 17 is the main signal uplink (base) Channel separation part distributed to each channel of the station → switching office) , 20 is a channel connection control unit for generating a respective distribution control information of channel connection / another transmission frequency route in response to a request of the cutting and sector-specific route.

  Here, the channel connection / disconnection request is based on a pre-assignment method in which a subscriber (terminal) connection schedule is determined in advance, or on the line connection by a real-time request from the subscriber (network side, terminal). There is a demand assignment method for performing In the case of the pre-assignment method, a channel connection / disconnection request is input to the channel connection control unit 20 according to a predetermined schedule from a call management device (not shown) provided on the exchange 60 side (or connected to the base station 10). Is done. In the demand assignment method, when a call is received at a terminal in the cell, a channel connection request from the network side is sent to the channel connection control unit 20 via the main signal line, and when a terminal in the cell transmits. Then, a channel connection request from the network side or the terminal that has received the request is sent to the channel connection control unit 20 via the main signal line or the demodulation line. Thus, the base station apparatus 10 according to the first embodiment can accommodate both pre-assignment and demand-assignment terminals. In the following description, the terminals A and B are pre-assigned terminals, and the terminals A and B in the figure are marked with a circle to distinguish them from other demand-assigned terminals C to G. The operation will be described below.

  The channel multiplexing unit 11 time-division-multiplexes each channel data of the main signal downlink, and the frequency-specific signal separation unit 12 distributes the input multiplexed data to the transmission frequency-specific routes 1) to 3) according to the stored contents of the control memory CM1. To do. That is, the configuration comprising the channel multiplexer 11 and the frequency signal separator 12 connects each channel data of the input line to each transmission slot of the radio line (a maximum of 9 slots can be used) according to the stored contents of the control memory CM1. Performs the function of the communication path switch. If channel data is already multiplexed on the input line, the channel multiplexing unit 11 can be omitted.

FIG. 7B shows the storage contents of the control memory CM1. The stored contents include the call data A and G addressed to the terminals A and G as the slots T ₁ and T ₃ of the transmission frequency f ₁ , the call data B and C addressed to the terminals B and C as the slots T ₁ and the transmission frequency f ₂ , respectively. T ₂ and call data D to F addressed to the terminals D to F are connected to the slots T _{1 to} T ₃ of the transmission frequency f ₃ , respectively.

Returning to FIG. 2, the modulators MOD1 to MOD3 modulate the carrier signal of a certain intermediate frequency F _i with the channel data of the frequency-specific paths 1) to 3) to generate each intermediate frequency signal F _i . The frequency converters TFCV1 to TFCV3 convert the input intermediate frequency signals F _i into output radio frequency signals f _{1 to} f ₃ (for example, f ₁ <f ₂ <f ₃ ) using local frequency signals f _{L1 to} f _L3 . here,
f _L1 = f ₁ −F _i
f _L2 = f ₂ −F _i
f _L3 = f ₃ -F _i
There is a relationship.

In the sector dividing and combining unit 13, the distributor D1~D3 the transmission frequency by route 1) to 3) transmit frequency signal f ₁ a ~f ₃ is divided into three respectively, and the control each divided signal has memory CM2 of Are distributed to the sector-specific routes 4) ′ to 6) ′ defined in advance corresponding to the time slots in accordance with the group switch control signals S _{1 to} S ₃ from the synthesizer M1, and the synthesizers M1 to M3 respectively distribute the transmitted frequency signals f. ₁ ~f ₃ sector by route 4)'～6) 'synthesized in each.

FIG. 3 is a diagram showing an embodiment of the sector distribution / synthesis unit 13 and shows an application example to a microwave circuit. In the figure, the power of the transmission frequency signal f ₁ is divided into three by the distributor D1, and each is input to the terminals a of the circulators C _{11 to} C ₁₃ . Now, when attention is paid to the circulator C _11, the terminal b is free termination by the resistor R via a PIN diode. Therefore, if the switch signal S ₁₁ = 1 (forward bias), the PIN diode becomes conductive, the signal at the terminal a is terminated at the terminal b, and does not finally appear at the terminal c. If the switch signal S ₁₁ = 0 (reverse bias), the PIN diode is opened, the signal at the terminal a is reflected at the terminal b, and finally appears at the terminal c. The same applies to the circulators C ₁₂ and C ₁₃ . It is obvious that such a microwave switch circuit may be provided on the synthesizers M1 to M3 instead of being provided on the distributors D1 to D3 side.

FIG. 8 shows the storage contents of the control memory CM2 (sector distribution control table). This stored content is generated by the channel connection control unit 20 based on the stored content of the transmission frequency-slot management table 22 of FIG. 7B and transferred to the control memory CM2. In FIG. 8, focusing on the group of the switch signal S ₁ , the transmission frequency signal f ₁ addressed to the terminal A is output to the synthesizer M1 side in the slot T _{1 due to} the switch signal S ₁₁ = 1. In the slot T ₂ , no transmission frequency signal f ₁ is output from the distributor D 1 due to the switch signals S _{11 to} S ₁₃ = 0. In the slot T ₃ , the transmission signal f ₁ addressed to the terminal G is output to the synthesizer M 3 side by the switch signal S ₁₃ = 1. In the slot T ₄ , the transmission signal f ₁ for the control channel CT is output to the synthesizer M ₁ side by the switch signal S ₁₁ = 1. The same applies to the other groups of switch signals S ₂ and S ₃ .

FIG. 4 shows an operation timing chart of the sector distribution synthesis unit 13. In the figure, the storage contents of the control memory CM2 is read out in synchronism with each slot timing T ₁ through T _4, the switch signal S ₁₁ to S _33. However, in this figure, the switch signal level for the output signal = 1 of the control memory CM2 is shown as LOW level (reverse bias), and the switch signal level for the output signal = 0 of the control memory CM2 is shown as HIGH level (forward bias). Yes.

Returning to FIG. 2, the output signals f _{1 to} f ₃ of the combiners M 1 to M ₃ are amplified by the high output power amplifiers HPA 1 to HPA 3, and sent from the antennas a 1 to a 3 to the sectors 1 to 3 via the antenna sharing units C 1 to C 3. Radiated.

On the other hand, the reception frequency signals from the antennas a1 to a3 are input to the low noise amplifiers LNA1 to LNA3 via the antenna sharing units C1 to C3, and are amplified to required levels, respectively. The sector synthesis / distribution unit 15 synthesizes the reception frequency signals f ₁ ′ to f ₃ ′ output from the low noise amplifiers LNA1 to LNA3 by the synthesizer M4, and divides the power into three by the divider D4.

  FIG. 5 is a diagram showing an embodiment of the sector synthesis / distribution unit 15 and shows an application example to a microwave circuit. This circuit can be constituted by a known E.J. Wilkinson type three-power combiner-three distributor. In the figure, each impedance Z is constituted by a λ / 4 length microstrip line, and each impedance Z is determined under the following conditions.

Z ₁ = √ (2R _g R _L ′)
R ₁ = 2R _L ′
Z ₂ = √ {(3/2) R _L R _L '}
Z ₃ = 2Z ₂ = √ (6R _L R _L ′)
R ₂ = 3R _L
Where R _g : input resistance (eg 50Ω)
R _L : Output resistance (for example, 50Ω)
Here, there is a degree of freedom in how to select the resistor R _L ′, and considering the broadband condition for covering the spread of the reception frequency signals f ₁ ′ to f ₃ ′,
It is known that R _L ′ = √ {(4/3) R _g R _L }.

Returning to FIG. 2, the output signals f ₁ ′ to f ₃ ′ (f ₁ ′ <f ₂ ′ <′ f ₃ ) of the sector combining / distributing unit 15 are the frequencies corresponding to the frequency-specific routes 1) ′ to 3) ′. is input to the converter RFCV1～RFCV3, is converted into the intermediate frequency signal F _{1'~F 3} of '' constant frequency F _i 'by the local signal f _{L1'~f L3.} here,
f _L1 ′ = f ₁ ′ −F _i ′
f _L2 ′ = f ₂ ′ −F _i ′
f _L3 ′ = f ₃ ′ −F _i ′
There is a relationship.

Further, the output signals F ₁ ′ to F ₃ ′ of the frequency converters RFCV1 to RFCV3 are input to the bandpass filters BPF1 to BPF3 having a constant center frequency F _i ′, and the reception frequency signal f ₁ ′ is received from the BPF1. the intermediate frequency signal F _i corresponding to the intermediate frequency signal F _i ', from BPF2 reception frequency signal f _2' corresponds to the intermediate frequency signal F _i 'husband corresponding to s extraction', received frequency signal f ₃ from the BPF 3 ' Is done. The output signals F _i ′ of the bandpass filters BPF 1 to BPF 3 are demodulated by the demodulation units DEM 1 to DEM 3 and input to the signal multiplexing unit 16.

  The signal multiplexing unit 16 time-division-multiplexes each demodulated data of the frequency-specific routes 1) ′ to 3) ′ according to the stored contents of the control memory CM3, and the channel separation unit 17 converts the input multiplexed data to the corresponding channel of the output line. Distribute. That is, the signal multiplexing unit 16 and the channel separation unit 17 are configured so that each demodulation time slot data (up to 9 slots) of the frequency-specific routes 1) ′ to 3) ′ is wired according to the storage contents of the control memory CM3. It functions as a communication path switch connected to each receiving channel.

  FIG. 7B shows the storage contents of the control memory CM3. The stored content is that the call data A and G from the terminals A and G are in the call channels A and G of the wired line, and the call data B and C from the terminals B and C are in the call channels B and C in the wired line. This indicates that the call data D to F from the terminals D to F are connected (exchanged) to the call channels D to F of the wired line, respectively. If the main signal uplink is a multiple line, the channel separation unit 17 can be omitted.

  FIG. 6 is a flowchart of call channel connection / release processing according to the first embodiment, which is executed by the channel connection control unit 20. When there is a request for channel connection / release (disconnection) based on origination / incoming call, handover (cell movement during call), etc. for a terminal located in the cell, the call channel is connected / released after passing through the necessary call processing. At this stage, input to this process. In step S1, processing branches according to the type of request. In the case of a channel connection request, the management information of the terminal related to the connection request is recorded in the terminal management table 21 in step S2.

FIG. 7A shows the stored contents of the terminal management table 21. This stored content corresponds to the communication status of FIG. In FIG. 7A, “Item No.” columns 1 to 9 exist, and a maximum of nine terminals can be accommodated in one cell (any sector may be used). In the “terminal” column, the telephone number of the terminal is recorded, and here, seven terminals A to G are being accommodated. The sector number in which the terminal is located is recorded in the “sector” column. For example, four terminals D to G are accommodated in the sector 3. In the “frequency” column, frequencies f _{1 to} f ₃ assigned for each terminal are recorded, and for example, the frequency f ₁ is assigned to the terminal G located in the sector 3. In the “slot” column, time slots S _{1 to} S ₃ assigned to each terminal are recorded. For example, in sector 3, terminals F and G share one time slot S ₃ at frequencies f ₃ and f ₁ . become.

In the following description, it is assumed that a channel connection request for terminal G has not yet been accepted in the processing stage of step S2. Returning to FIG. 6, in step S3, empty slots are captured from the transmission / reception frequency-slot management tables 22 and 23 of FIG. Frequency as free slots at this point (f _1, f ₁ ') of _{(T 2, R 2),} (T 3, R 3) and the frequency (f _2, f _2') of (T _3, R ₃ In this example, the time slot (T ₃ , R ₃ ) of the frequency (f ₁ , f ₁ ′) is captured.

  In step S6, the contents of the terminal management table 21 and the frequency-slot management tables 22 and 23 in FIG. 7 are updated based on the time slot acquisition information. In step S7, the contents of the control memories CM1 and CM3 are updated with the contents of the frequency-slot management tables 22 and 23. In step S8, the contents of the sector distribution control table 24 of FIG. 8 are updated based on the time slot acquisition information.

In FIG. 8, a switch control signal S ₁₃ = 1 for newly distributing the transmission frequency signal f ₁ addressed to the terminal G to the sector 3 at the timing of the slot T ₃ is newly recorded. Returning to FIG. 6, in step S9, the contents of the control memory CM2 are updated with the contents of the sector distribution control table 24.

  If the channel disconnection (release) request is made in step S1, the terminal management information related to the channel disconnection request is deleted from the terminal management table 21 in step S4. In step S5, the slot is released from the transmission / reception frequency-slot management tables 22 and 23. In subsequent steps S6 to S9, the same processing as described above is performed based on the slot release information.

FIG. 9 is a diagram for explaining a communication state according to the first embodiment. 9A and 9B correspond to the communication status of FIGS. 19A and 19B, but according to the first embodiment, the fourth terminal G in the sector 3 is used. Are simultaneously accommodated at the timing of the time slot (T ₃ , R ₃ ) of the sector 3 using the empty time slots (T ₃ , R ₃ ) of the frequencies (f ₁ , f ₁ ′) in the sector 1. . In this case, in the sector 3, since the frequency used between the terminals F and G is different from f ₃ and f ₁ , interference does not occur. On the other hand, in sector 1, empty time slots (T ₃ , R ₃ ) of frequencies (f ₁ , f ₁ ′) are effectively used in sector 3 where subscribers are concentrated. Thus, the base station apparatus 10 according to the first embodiment can flexibly accommodate up to nine terminals for each of the sectors 1 to 3 and effectively uses communication resources (frequency, etc.).

  FIG. 10 is a block diagram of another base station apparatus according to the first embodiment, in which the transmission side frequency conversion units TFCV1 to TFCV3 are in the subsequent stage of the sector distribution combination unit 13, and the reception side frequency conversion units RFCV1 to RFCV3 are sector combination. The case where each is located in the front | former stage of the distribution part 15 is shown.

In the figure, modulators MOD1 to MOD3 modulate carrier signals of intermediate frequencies F _{1 to} F ₃ (for example, F ₁ <F ₂ <F ₃ ) with each channel data of transmission frequency paths 1) to 3), and intermediate Frequency signals F _{1 to} F ₃ are generated. The intermediate frequency signals F _{1 to} F ₃ are switch-distributed / combined by the sector distributing / combining unit 13, and the intermediate frequency signals F _{1 to} F ₃ are output to the sector-specific routes 4) to 6), respectively. Frequency converter TFCV1~TFCV3 local frequency signal each of the output by f _L radio frequency signal f ₁ ~f ₃ of constant respective intermediate frequency signals F ₁ to F ₃ inputs _{(common) (f 1 <f 2 <} f 3 ). here,
f _L = f ₁ -F ₁ = f ₂ -F ₂ = f ₃ -F ₃
There is a relationship.

On the other hand, the output signals f ₁ ′ to f ₃ ′ of the low-noise amplifiers LNA _{1 to} LNA ₃ are input to the frequency converters RFCV _{1 to} RFCV _{3, and the} intermediate frequency signals F ₁ ′ to F by the constant (common) local signal f _L ′. ₃ '(F ₁ '<F ₂ '<' F ₃ ). here,
f _L ′ = f ₁ ′ −F ₁ ′ = f ₂ ′ −F ₂ ′ = f ₃ ′ −F ₃ ′
There is a relationship.

The intermediate frequency signals F ₁ ′ to F ₃ ′ are combined / distributed by the sector combining / distributing unit 15 and output to the reception frequency paths 1) ′ to 3) ′, and the BPF ₁ having the center frequency F ₁ ′. From the intermediate frequency signal F ₁ ′ corresponding to the reception frequency signal f ₁ ′, and the BPF ₂ having the center frequency F ₂ ′ has the intermediate frequency signal F ₂ and the center frequency F ₃ ′ corresponding to the reception frequency signal f ₂ ′. An intermediate frequency signal F ₃ ′ corresponding to the reception frequency signal f ₃ ′ is extracted from the BPF ₃ . Thus, each received frequency signal were allowed to mix the reception frequency for each sector 1~3 f _{1'~f 3} 'is received frequency-route 1)'～3)' the intermediate frequency signal F _{1'~F 3} of It is separated into 'and extracted corresponding to the time slot. Other configurations may be the same as those described in FIG.

  According to the other base station apparatus according to the first embodiment, since both the sector distribution / combining unit 13 and the sector combining / distributing unit 15 can be used in the intermediate frequency domain, the units 13 and 15 are replaced with the microwave circuit. Thus, it can be made compact by a lumped constant circuit. In addition, you may comprise so that any one of the sector distribution synthetic | combination part 13 or the sector synthetic | combination distribution part 15 may be used in an intermediate frequency area | region.

  FIG. 11 is a block diagram of a base station apparatus according to the second embodiment, showing a case where a failure of each device in the apparatus can be flexibly dealt with without adopting an expensive redundant configuration. In the figure, reference numeral 18 denotes a failure information collection unit that collects various types of failure information from each device in the apparatus and notifies the channel connection control unit 20 of the failure information. Other configurations may be the same as those described in FIG. 2 (or FIG. 10). The flowchart of the call channel connection / release process may be the same as that described in FIG. However, each device in the apparatus has its own failure detection function.

FIGS. 12 and 13 are views (1) and (2) for explaining the storage contents of various tables in the second embodiment, and FIG. 13 (B) shows the storage contents of the failed device management table. In the figure, 25 is a faulty device management table for the transmission system, and 26 is a faulty device management table for the reception system. Each corresponds to MOD1~MOD3 transmission systems failure device management table 25 in basically the transmission frequency by route 1) to 3) (frequency f ₁ ~f _3), TFCV1~TFCV3, each fault Yes in HPA1~HPA3 / No information is managed. In the faulty device management table 26 in the receiving system, basically, the routes according to the receiving frequencies 1) ′ to ₃ ) ′ (frequency f ₁ ′ to f ₃ ′) correspond to the frequencies DEM1 to DEM3, RFCV1 to RFCV3, LNA1 to LNA3. Information on whether or not each failure exists is managed. In the following description, it is assumed that the transmission side frequency conversion unit TFCV1 is out of order.

FIG. 12B shows the stored contents of the transmission / reception frequency-slot management tables 22 and 23. The channel connection control unit 20 manages the faulty device management tables 25 and 26 and updates the stored contents of the transmission / reception frequency-slot management tables 22 and 23 when, for example, the TFCV1 is faulty. Specifically, in the transmission side frequency-slot management table 22, as apparent from FIG. 11, the system of the transmission frequency route 1) (frequency f ₁ ) cannot be used due to the failure of TFCV1. . In view of this, unusable (x marks) are recorded in the time slots T _{1 to} T ₃ of the frequency f ₁ in the transmission side frequency-slot management table 22.

On the other hand, in the reception side frequency-slot management table 23, there is no failure of the device. However, since the transmission frequency f ₁ is not used, the reception side frequency f ₁ ′ which is normally paired with the transmission frequency f ₁ is not used or used. It is desirable not to let it. In view of this, in the receiving frequency-slot management table 23, the reception frequency-specific route 1) ′ (frequency f ₁ ′) is recorded as unusable (-marked) in the time slots R _{1 to} R ₃ . The channel connection control unit 20 looks at the stored contents of such tables 22 and 23 managed by itself, and when receiving a channel connection request, also considers the slots that are disabled as described above. A suitable empty slot can be easily captured.

Incidentally, in this example, the time slot T _{1 to} T ₃ of the transmission frequency f ₁ cannot be used due to equipment failure. As a result, the pre-assigned terminal A performs communication in the time slot T ₃ of the transmission frequency f _2. On the other hand, the demand assign terminal G cannot communicate because there is no empty slot. Accordingly, the connection request management information of terminal G in the column of item number 7 of terminal management table 21 in FIG. 12A in this case is deleted.

FIG. 13A shows the stored contents of the sector distribution control table 24 in this case. Since the system of the transmission frequency f ₁ is not used as described above, the switch signals S _{11 to} S ₁₃ are all “0” through the time slots T _{1 to} T ₄ . On the other hand, as a result of the time slot T ₃ having the transmission frequency f ₂ being assigned to the pre-assigned terminal A existing in the sector 1, the switch signal S ₂₁ becomes “1” at the timings of the time slots T ₃ and T _4. Yes. Therefore, the pre-assign terminal A located in the sector 1 (semi-fixedly located in the building or the like) can use the frequency (f ₂ instead) even if the base station 10 cannot use the frequencies (f ₁ , f ₁ ′). , F ₂ ′) can be used to exchange the call signal A and, if necessary, the control signal CT with the base station 10. In this case, the channel connection control unit 20 can also preferentially connect the pre-assign terminal A. The same applies when other equipment in the device fails. Also in this case, various detour paths can be considered depending on the failure location.

  Thus, according to the second embodiment, each terminal in the sectors 1 to 3 can be flexibly accommodated in the base station apparatus 10 even if the apparatus in the apparatus fails. In addition, since it is not necessary to adopt an expensive redundant configuration as a countermeasure against failure, it is possible to maintain the high reliability of the communication service even with the existing equipment.

  FIG. 14 is a block diagram of another base station apparatus according to the second embodiment, and shows a case where high output power amplifiers HPA1 to HPA3 are provided on the upstream side of the sector distribution combining unit 13. In the configuration of FIG. 11 described above, if any one of the high output power amplifiers HPA1 to HPA3 fails, the terminal of the corresponding sector cannot be accommodated. However, according to the configuration of FIG. 14, such a situation can be effectively avoided because the sector distribution combining unit 13 exists between the high output power amplifiers HPA1 to HPA3 and the antennas a1 to a3. Therefore, the reliability of the communication service is further improved.

FIG. 15 is a block diagram of a base station apparatus according to the third embodiment, and shows a case where power consumption can be saved by temporarily stopping power supply to in-device equipment that is not being used. Further, by assigning each time slot in order from one frequency (for example, f ₁ , f ₁ ′) to each terminal in sectors 1 to 3 until the time slot is full, the remaining frequency-specific routes are made free. In addition, a case is shown in which a significant saving in power consumption can be achieved by stopping power supply to that portion.

  In the figure, reference numeral 19 denotes a power supply control unit that performs ON / OFF control of power supply to each device in the apparatus in accordance with a power supply control signal PC from the channel connection control unit 20. Other configurations may be the same as those described in FIG. 2 (or FIG. 10).

  FIG. 16 is a flowchart of a call channel connection / release process according to the third embodiment. Note that the same processing as that described in FIG. 6 is given the same step number, and description thereof is omitted. Here, steps S11 to S14 are newly added. In step S11, the contents of the terminal management table 21 (which may be transmission / reception frequency-slot management tables 22 and 23) are changed because the terminal management table 21 is changed (slot acquisition / release) in the preceding step. refer.

FIG. 17A shows the stored contents of the terminal management table 21. In the figure, it is assumed that a terminal C located in the sector 2 is newly accommodated in addition to the terminals A and B previously accommodated. Since the frequency (f ₁ , f ₁ ′) can use a maximum of 3 slots, the frequency (f
₁ , f ₁ ′) slot S ₃ is allocated.

FIG. 17B shows the stored contents of the transmission / reception frequency-slot management tables 22 and 23 in this case. Terminals A to C are packed and accommodated in time slots (T ₁ , R ₁ ) to (T ₃ , R ₃ ) of frequencies (f ₁ , f ₁ ′).

Returning to FIG. 16, in step S12, it is determined whether or not it is necessary to change the power supply state. FIG. 18B shows the stored contents of the transmission / reception power supply management tables 27 and 28. In the figure, since the base station 10 in this case can accommodate all the terminals A to C in the sectors 1 and 2 only with the frequency (f ₁ , f ₁ ′) system, as shown in FIG. It is sufficient to supply power to HPA1. The sector distribution / combination unit 13 is always operating. Further, since only the frequency f ₁ ′ is used for the sectors 1 and 2 on the receiving side, it is sufficient to supply power to the LNA 1, LNA 2, RFCV 1, and DEM 1. The sector synthesis / distribution unit 15 and BPF1 to BPF3 are circuits composed of passive elements. Further, it is not necessary to change this power supply state before / after accommodation of the terminal C.

  Returning to FIG. 16, therefore, in the current determination in step S12, it is not necessary to change the power supply state, and the flow proceeds to step S6. If it is necessary to change the power supply state in step S12, a new power supply target device is obtained in step S13, and the transmission / reception power supply management tables 27 and 28 are updated. In step S <b> 14, the power supply change information PC is output to the power supply control unit 19. Accordingly, the power supply control unit 19 performs ON / OFF control of power supply to the corresponding device in the apparatus.

FIG. 18A shows the stored contents of the sector distribution control table 24 corresponding to the transmission frequency-slot management table 22 of FIG. The switch signal S ₁₁ is “1” at each timing of the communication slot T ₁ connected to the terminal A in the sector 1 and the control slot T ₄ . The switch signal S ₁₂ is “1” at each timing of the communication slots T ₂ and T ₃ connected to the terminals B and C of the sector 2 and the control slot T ₄ . In this way, the frequencies (f ₁ , f ₁ ′) are also between the base station 10 and the terminals B and C in the sector 2. Control-like signals can be exchanged via the control slots (T ₄ , R ₄ ). Since the other switch signals S _{13 to} S ₃₃ are not used, they are all “0”.

  Needless to say, the second and third embodiments may be combined.

  In each of the above embodiments, specific numerical examples (the number of sectors, the number of routes by frequency, etc.) have been described. Needless to say, the present invention is not limited to these numerical examples.

  In each of the above-described embodiments, the case where the pre-assignment method and the demand assignment method are mixed for communication services has been described. However, it is obvious that the present invention can be applied to a communication service of the pre-assignment method or the demand assignment method as a whole. is there.

  In each of the above-described embodiments, application examples to the telephone system have been described. Needless to say, the present invention can also be applied to a data communication system that performs communication such as computer data and image data.

  Moreover, although several embodiment suitable for the said this invention was described, it cannot be overemphasized that the structure of each part, control, and various changes can be performed within the range which does not deviate from this invention.

It is a figure explaining the principle of this invention. It is a block diagram of the base station apparatus by 1st Embodiment. It is a figure which shows the Example of the sector distribution synthetic | combination part 13. FIG. 4 is an operation timing chart of the sector distribution synthesis unit 13. FIG. 6 is a diagram illustrating an example of a sector synthesis / distribution unit 15. 4 is a flowchart of a call channel connection / release process according to the first embodiment. It is FIG. (1) explaining the memory content of the various tables by 1st Embodiment. It is FIG. (2) explaining the memory content of the various tables by 1st Embodiment. It is a figure explaining the communication condition by 1st Embodiment. It is a block diagram of the other base station apparatus by 1st Embodiment. It is a block diagram of the base station apparatus by 2nd Embodiment. It is FIG. (1) explaining the memory content of the various tables by 2nd Embodiment. It is FIG. (2) explaining the memory content of the various tables by 2nd Embodiment. It is a block diagram of the other base station apparatus by 2nd Embodiment. It is a block diagram of the base station apparatus by 3rd Embodiment. It is a flowchart of the call channel connection / release process by 3rd Embodiment. It is FIG. (1) explaining the memory content of the various tables by 3rd Embodiment. It is FIG. (2) explaining the memory content of the various tables by 3rd Embodiment. It is a figure explaining a prior art.

Explanation of symbols

1-3 Sector 10 Base station equipment (BS)
DESCRIPTION OF SYMBOLS 11 Channel multiplexing part 12 Frequency-specific signal separation part 13 Sector distribution combination part 15 Sector combination distribution part 16 Signal multiplexing part 17 Channel separation part 18 Fault information collection part 19 Power supply control part 20 Channel connection control part 60 Mobile switching center 100 Cell a1 ~ A3 Directional antenna BPF1 ~ BPF3 Band pass filter C1 ~ C3 Antenna shared part CM1 ~ CM3 Control memory D1 ~ D4 Distributor DEM1 ~ DEM3 Demodulator HPA1 ~ HPA3 High output power amplifier LNA1 ~ LNA3 Low noise amplifier M1 ~ M4 Synthesizer MOD1 to MOD3 Modulation unit RFCV1 to RFCV3 Reception side frequency conversion unit TFCV1 to TFCV3 Transmission side frequency conversion unit

Claims (6)

In a base station apparatus of a radio communication system that divides one cell into a plurality of sectors and communicates with a plurality of terminal stations via the antenna for each sector by the TDMA method.
A frequency-specific distribution modulation unit that distributes each channel data to be transmitted corresponding to each time slot of a plurality of transmission frequency-specific routes,
A sector-by-sector distribution combining unit that distributes each modulation signal to a sector-specific route preliminarily defined for time slots, and synthesizes these according to the route;
A base station apparatus, comprising: a channel connection control unit that generates distribution control information for a transmission frequency route and a sector route according to a channel connection / disconnection request. A sector combining / distributing unit that combines the received signals of the routes according to sectors and distributes the signals to the routes according to a plurality of receiving frequencies;
The base station apparatus according to claim 1, further comprising: a frequency-specific demodulation unit that extracts a frequency signal corresponding to a route according to reception frequency from each distribution signal and demodulates the signal according to a time slot. The channel connection control unit generates each distribution control information so as to connect an empty slot of a route according to a transmission frequency to an existing sector of a connection requesting terminal when a new channel connection request is made. Or the base station apparatus of 2. A failure information collection unit that collects failure information of each device in the device is provided, and the channel connection control unit is affected by the failure device in each time slot of the route according to the transmission frequency based on the failure information of the failure information collection unit. The base station apparatus according to any one of claims 1 to 3, wherein no time slot is used. A power supply control unit that performs ON / OFF control of power supply of each device in the apparatus according to an instruction of the channel connection control unit is provided, and the channel connection control unit supplies power to each device in the device that is not using a route according to transmission and reception frequencies. 5. The base station apparatus according to claim 1, wherein the base station apparatus instructs to turn off. The base station according to any one of claims 1 to 5, wherein the channel connection control unit uses time slots so as to be filled in order from a time slot of any one transmission frequency route. apparatus.

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