JP5056296B2 - Method for switching accommodation sector of light projecting station apparatus and radio base station apparatus - Google Patents

Description

The present invention relates to a method and a radio base station device switching housing sector of optical extension station apparatus. As shown in FIG. 15, in the mobile radio communication system, a mobile radio exchange center 15-2 is connected to a mobile communication network 15-1, and a radio controller (RNC) 15- is connected to the mobile radio exchange center 15-2. 3 is connected, a radio base station apparatus (BTS) 15-4 is connected to the radio control apparatus (RNC) 15-3, and a light projecting station apparatus (OPTBTS) is further connected to the radio base station apparatus (BTS) 15-4. 15-5 is connected, and the mobile terminal 15-6 moves via a radio link set between the nearest radio base station apparatus (BTS) 15-4 or the optical extension station apparatus (OPTBTS) 15-5. Perform wireless communication.

  A plurality of optical extension station devices (OPTBTS) 15-5 are serially connected under each sector of the radio base station device (BTS) 15-4. The present invention relates to a method for switching accommodation sectors of an optical overhang station (OPTBTS) 15-5 under the control of each sector of a radio base station (BTS) 15-4 in such a mobile radio communication system, and a radio base station (BTS). ) 15-4 and optical overhang station equipment (OPTBTS) 15-5. In the following description, the radio base station apparatus (BTS) may be referred to as a master unit, and the light extension station apparatus (OPTBTS) may be referred to as a slave unit.

  FIG. 16 shows a connection configuration between a conventional radio base station apparatus (BTS) and an optical extension station apparatus (OPTBTS). As shown in the figure, the optical overhang station apparatus (OPTBTS) 15-5 is cascade-serially connected to each sector of the radio base station apparatus (BTS) 15-4 by optical fiber cables. In this configuration, nothing is connected to the last optical extension station device (OPTBTS) 15-5 that is accommodated in the cascade serial connection.

  The signal processing unit of each sector in the radio base station apparatus (BTS) 15-4 transmits / receives a radio frequency to / from the mobile terminal transmitted / received via each optical overhang station apparatus (OPTBTS) 15-5 connected and accommodated in the own sector. The band signal is converted into a base band by a base band processing unit, the base band signal is transmitted to and received from the multiplexing / demultiplexing unit (MUX / DMUX), and the multiplexing / demultiplexing unit (MUX / DMUX). ) Transmits / receives the multiplexed baseband signal to / from an upper radio control apparatus (RNC).

  As a prior art document related to the present invention, the following patent document 1 describes a master base station that accommodates a digital line for connection with a host exchange and a plurality of slave bases that operate subordinately under the master base station. A base station multiplexing apparatus comprising a wireless link that connects a station, a master base station, and a plurality of slave base stations via a wireless line in a loop, and accommodates a minimum necessary digital line in accordance with traffic in the wireless area Are listed.

  Further, in Patent Document 2 below, a master station having an interface function between a radio signal and an optical signal is interposed between a base station and a mobile unit that moves, and an optical fiber is used between the base station and the master station. In a wireless communication apparatus that connects and performs bidirectional communication between a base station and a slave unit, the master station transmission power that detects the number of slave units accommodated in the master station and adjusts the transmission power of the master station according to the accommodated number A wireless communication apparatus provided with adjusting means is described.

Also, in Patent Document 3 below, when a large number of mobile devices gather in a certain cell and the number of wireless use channels exceeds a threshold, the base station lowers the perch channel transmission power, and the perch channel reception quality of the mobile device. A cell radius control method for reducing the cell radius and reducing the cell radius is described.
JP-A-9-51573 JP-A-4-213231 JP 2000-287441 A

  As described above, the optical extension station device (OPTBTS) 15-5 is cascade-serially connected to the signal processing unit of each sector of the radio base station device (BTS) 15-4, and is accommodated in only one sector. ing. Therefore, as shown in FIG. 17, for example, calls of mobile terminals that pass through the optical overhang station (OPTBTS) 15-5 accommodated in the first sector # 1 are concentrated, and the signal processing unit of the sector # 1 When the number of mobile terminals in communication to be processed increases, the total transmission power transmitted by the signal processing unit of the sector # 1 increases. When the total transmission power overflows, a new mobile terminal connection in the sector # 1 Can no longer do.

  Similarly, mobile terminal calls that are routed through the optical overhang station (OPTBTS) 15-5 accommodated in the first sector # 1 are concentrated, and the mobile phone during communication is processed by the signal processing unit of the sector # 1. When the number of terminals increases, the total interference wave level of the sector # 1 increases, and a new mobile terminal cannot be connected in the sector # 1.

  In the present invention, when mobile terminals in communication via the optical overhang station device (OPTBTS) 15-5 are concentrated in a specific sector, the connection of the mobile terminals in the specific sector is distributed to other sectors, and the specific The purpose is to enable connection with a new mobile terminal in the sector.

  The method of switching the accommodation sector of the optical overhanging station apparatus according to the present invention is a method of switching the accommodation sector of the optical overhanging station apparatus that is accommodated in the signal processing unit of each sector of the radio base station apparatus and switches the accommodation destination of the serially connected optical overhanging station apparatus. A plurality of first and second sector signal processing units of the radio base station apparatus, connected to serially connected farthest optical extension station apparatuses; The optical overhanging station apparatus is provided with a changeover switch for switching the connection direction of the serial connection, and the signal overhanging station apparatus is connected to each of the optically overhanging station apparatuses serially connected from the signal processing unit of one of the first and second sectors. And a control signal for disconnecting the light projecting station device from the serial connection is transmitted, and the light projecting station is transmitted from the signal processing unit of the other sector of the first and second sectors. A control signal for adding a light extension station device to a serial connection by specifying a device, and the light extension station device transmits the changeover switch according to the control signal from the signal processing unit of the first or second sector. Thus, the connection direction of the serial connection is switched.

  Further, the radio base station apparatus of the present invention is a radio base station apparatus in which a serially connected optical extension station apparatus is accommodated in the signal processing section of each sector, and the signal processing sections of at least two first and second sectors are used. The optical extension station apparatus provided with the changeover switch for switching the connection direction of serial connection is connected to the far-end optical extension station apparatuses serially connected to each other, and the signal processing of the first and second sectors Serially connected to each of the first and second sector signal processing units, and the optically connected station device is identified and serially connected to each serially connected optically extended station device. A control signal for disconnecting from the first and second sectors is transmitted from the signal processing unit of the first and second sectors to identify the light projecting station device and add the light projecting station device to the serial connection. Characterized by comprising means for transmitting a control signal.

  Further, it is determined whether or not the total transmission power of the signal processing units of the first and second sectors exceeds a predetermined threshold, and the total transmission power of the signal processing unit of the first or second sector is predetermined. Of the sector whose total transmission power does not exceed the predetermined threshold, the signal processing unit of the sector whose total transmission power exceeds the predetermined threshold causes the control signal for disconnecting the light projecting station device to be transmitted. The signal processing unit includes a control unit that transmits the control signal for adding a light projecting station device.

  In addition, the total interference wave level for each sector of each light extension station apparatus serially connected to the signal processing units of the first and second sectors is observed, and the interference wave level of each light extension station apparatus is a predetermined threshold value. If the interference wave level of the overhanging station apparatus exceeds a predetermined threshold value, the control signal for disconnecting the overhanging station apparatus from the signal processing unit of the sector having a larger total interference wave level And a control unit that transmits the control signal for adding the light projecting station device to the signal processing unit of the sector having a smaller total interference wave level.

  According to the present invention, the last light extension station devices serially connected to any two sectors are connected to each other, the light extension station devices are connected in a ring shape via the radio base station device, and the two When the number of mobile terminals connected via the light extension station device under one of the sectors increases and it becomes impossible to connect a new mobile terminal in the one sector, some light extension station devices By switching to a serial connection under the other sector and accommodating it, a new portable terminal can be connected in the one sector.

  FIG. 1 shows a connection configuration between a radio base station apparatus (BTS) and an optical extension station apparatus (OPTBTS) according to the present invention. In the present invention, the last optical extension station apparatus (OPTBTS) under the mth sector (#m) of the radio base station apparatus (BTS) and the last optical extension station apparatus under the nth sector (#n) (OPTBTS) is connected with an optical fiber cable, and the optical overhanging station apparatus (OPTBTS) under the control of the mth sector (#m) and the nth sector (#n) is connected via the radio base station apparatus (BTS). Are connected in a ring shape. Note that m ≠ n.

  FIG. 1 shows a configuration example in which the optical overhanging station devices (OPTBTS) under the control of the first sector # 1 and the second sector # 2 are connected in a ring shape. The number of the light projecting station devices (OPTBTS) is not limited to the number shown in the figure, and more light projecting station devices (OPTBTS) may be connected.

  When the number of mobile terminals in communication within the area covered by a specific sector of the radio base station apparatus (BTS) increases and the total transmission power overflows, the overhanging station apparatus (OPTBTS) under the overflowed sector is It distributes to the sector under the other sector that is connected in a ring shape with an optical fiber cable, reduces the number of overhanging station equipment (OPTBTS) under the overflowed sector, and alleviates the overflow of the total transmission power .

The above operation example will be described in detail below.
[1] Detection of overflow of total transmission power (see Fig. 1)
(1) The control unit of the radio base station apparatus (BTS) 1-1 manages and controls the number of serially connected optical extension station apparatuses (OPTBTS) 1-2 under each sector.
(2) The first sector (# 1) of the radio base station apparatus (BTS) 1-1 is subordinated to the serially connected optical extension station apparatuses (OPTBTS) (C) and (D), and the second sector (# 2) is assumed to be under the control of the serially connected optical overhanging station devices (OPTBTS) (E), (F).
(3) In the first sector (# 1) of the radio base station apparatus (BTS), the transmission power increases as the number of mobile terminal connections through the optical extension station apparatuses (OPTBTS) (C) and (D) increases. , The total transmission power increases.
(4) When the total transmission power overflows, a new terminal cannot be connected.
(5) The first sector # 1 of the radio base station apparatus (BTS) notifies the control unit that the total transmission power has overflowed.

[2] Resolving total transmission power overflow (see Figure 2)
(1) The first sector (# 1) of the radio base station apparatus (BTS) notifies the control unit that the total transmission power has overflowed.
(2) The control unit recognizes that the first sector (# 1) and the second sector (# 2) have a ring configuration.
(3) The control unit reduces the number of overhanging station apparatuses (OPTBTS) serially connected to the first sector (# 1), and the overhanging station apparatus serially connected to the second sector (# 2) A process of increasing the number of (OPTBTS) is performed.
(4) The first sector (# 1) of the radio base station apparatus (BTS) constitutes a serial connection under the control of only the optical extension station apparatus (OPTBTS) (C), and the second sector (# 2) Constitutes a serial connection under the control of the light projecting station equipment (OPTBTS) (D), (E), (F). That is, the serial connection changes from the configuration indicated by the solid line in FIG. 2 to the configuration indicated by the dotted line.
(5) In the first sector (# 1), the optical extension station device (OPTBTS) (D) is deleted from the serial connection, so that the overflow of the total transmission power is eliminated and a new portable terminal can be connected. Become.

  Next, the configuration of the radio base station apparatus (BTS) and the light extension station apparatus (OPTBTS) of the slave unit will be described. FIG. 3 shows the configuration of the radio base station apparatus (BTS) and the light extension station apparatus (OPTBTS) and the first connection form thereof. This figure shows an example of a connection form in which a receiving base station (BTS) is connected to the left side of the optical overhang station (OPTBTS).

  The radio base station apparatus (BTS) 3-1 monitors the total transmission power of each sector, and the number of optical overhang station apparatuses (OPTBTS) serially connected to the sector where the total transmission power exceeds a certain value. The control part 3-11 which performs control which reduces is provided.

  In addition, the optical overhanging station device (OPTBTS) 3-2 is connected to the radio base station device (BTS) 3-1 side via an optical fiber cable and the front photoelectric conversion unit (O / E, E / O). ) 3-21, a radio signal transmission unit (TX) 3-22, a radio signal reception unit (RX) 3-23, and a subsequent optical overhang station (OPTBTS) side are connected via an optical fiber cable. And a photoelectric conversion unit (O / E, E / O) 3-24 on the rear side.

  Further, the optical extension station device (OPTBTS) 3-2 converts a downstream signal input from the photoelectric conversion unit (O / E, E / O) 3-21 on the front side into a radio signal transmission unit (TX) 3 -22 and the second selector switch 3-27, and the signal from the photoelectric conversion unit (O / E, E / O) 3-24 on the rear side is output to the upstream signal adding unit (ADD) 3-26 The first changeover switch 3-25 is provided.

  In addition, the optical overhang station apparatus (OPTBTS) 3-2 is an upstream signal input from the rear-side optical overhang station apparatus (OPTBTS) serially connected via the first changeover switch (SW) 3-25. In addition, an uplink signal adding unit (ADD) 3-26 for adding and outputting an uplink signal input from the radio signal receiving unit (RX) 3-23 is provided.

  The optical extension station device (OPTBTS) 3-2 converts the downstream signal output from the first changeover switch (SW) 3-25 into a photoelectric conversion unit (O / E, E / O) on the rear side. The second signal is output to 3-24, and the upstream signal input from the upstream signal addition unit (ADD) 3-26 is output to the front photoelectric conversion unit (O / E, E / O) 3-21. Switch (SW) 3-27.

  As shown in FIG. 3, the first and second change-over switches (SW) 3-25 and 3-27 are connected to the receiving base station (BTS) in the left direction of the light extension station (OPTBTS). In such a case, the signals from the input terminals are set to be sent to the output terminals as indicated by the solid arrows in the changeover switches (SW) 3-25 and 3-27.

  Further, when there is a subsequent optical overhanging station device (OPTBTS) connected in series on the right side of the illustrated optical overhanging station device (OPTBTS) 3-2, the first and second changeover switches (SW) are indicated by dotted lines. The switching connection is set as indicated by the arrow. However, if there is no subsequent optical overhanging station device (OPTBTS) serially connected to the right side, and it becomes the last optical overhanging station device (OPTBTS), only the connection indicated by the solid line arrow in the figure is performed, The connection indicated by the dotted arrow is disconnected. Thereby, the right overhanging station apparatus (OPTBTS) is disconnected from the serial connection.

  FIG. 4 shows an example of a second connection configuration in which a radio base station apparatus (BTS) that is a serial connection destination exists on the right side of the optical extension station apparatus (OPTBTS). In the case of this connection form, the first changeover switch 3-25 of the optical extension station device (OPTBTS) 3-2 is a downlink input from the photoelectric conversion unit (O / E, E / O) 3-24 on the front side. The direction signal is output to the radio signal transmission unit (TX) 3-22 and the second changeover switch 3-27, and the signal from the photoelectric conversion unit (O / E, E / O) 3-21 on the rear side is output. It is set to output to the uplink signal adding unit (ADD) 3-26.

  Further, the second changeover switch (SW) 3-27 converts the downstream signal input from the first changeover switch (SW) 3-25 into a photoelectric conversion unit (O / E, E / O on the rear side). ) 3-21 and the upstream signal input from the upstream signal adding unit (ADD) 3-26 is output to the photoelectric conversion unit (O / E, E / O) 3-24 on the front side. It is set as follows. Other configurations are the same as those described in FIG.

  In the first changeover switches (SW) 3-25 and 3-27, the connection indicated by the dotted arrow is set when there is a subsequent optical extension station device (OPTBTS) of serial connection on the left side of FIG. If there is no subsequent overhanging station device (OPTBTS) on the left side, and the rearmost overhanging station device (OPTBTS) is used, the connection of the dotted arrow is cut off, so that the left overhanging station device (OPTBTS) ) Is disconnected from the serial connection.

  FIG. 5 shows a configuration example of a format of a signal transmitted / received between the radio base station apparatus (BTS) and the light extension station apparatus (OPTBTS). (A) of the figure shows the format of a signal transmitted from the radio base station apparatus (BTS) side to the optical extension station apparatus (OPTBTS) side, and (b) of the figure shows the optical extension station apparatus (OPTBTS). The format of the signal transmitted from the side to the radio base station apparatus (BTS) side is shown.

  Between the wireless base station device (BTS) and the optical extension station device (OPTBTS), wireless data of the mobile terminal and various connection control signals are transmitted and received in a predetermined format area via the optical fiber cable. A part of the area where the control signal is transmitted / received is used for signal transmission / reception of the slave unit control, and the serial connection change control of the optical extension station device (OPTBTS) is performed.

  As a slave unit control signal from the radio base station device (BTS) side to the optical extension station device (OPTBTS) side, a signal specifying a slave unit and instructing a switching connection of the changeover switch (SW) of the identified slave unit Send. In addition, as a slave unit control signal from the optical extension station device (OPTBTS) side to the radio base station device (BTS) side, a response signal to the instruction from the master unit is transmitted.

  Next, radio communication at the time of switching the accommodation sector of the optical extension station apparatus (OPTBTS) will be described. FIG. 6 shows each radio area covered by the antenna of each optical overhang station (OPTBTS). 6-1 is a wireless area of the light projecting station apparatus (A), 6-2 is a wireless area of the light projecting station apparatus (B), 6-3 is a wireless area of the light projecting station apparatus (C), and 6-4 is light. The wireless area of the overhanging station apparatus (D), 6-5 is the wireless area of the overhanging station apparatus (E), 6-6 is the wireless area of the overhanging station apparatus (F), and 6-7 is the overhanging station apparatus (G The wireless area 6-8 is the wireless area of the light extension station apparatus (H).

  As shown in the figure, in many cases, a plurality of wireless areas overlap each other in the wireless area covered by each optical overhang station apparatus (OPTBTS). Therefore, when switching the number of optical projecting station devices (OPTBTS) under each sector, the path of the radio signal transmitted and received by the optical projecting station device (OPTBTS) to be switched is cut off, but other overlapping radio areas Since the wireless communication of the mobile terminal is continued through the optical overhanging station device (OPTBTS) under the sector covering the mobile terminal, the wireless communication of the mobile terminal does not disconnect. This is the same as the operation when the wireless area is switched by the movement of the mobile terminal.

  For example, when the light projecting station device (B) under the sector a is switched to the subordinate sector y with the ring structure, the mobile phone that has performed wireless communication in the wireless area 6-2 of the light projecting station device (B). The terminal continues the wireless communication by the sector b or the opposite sector x through the light extension station device (D) that covers the wireless area 6-4 that overlaps the wireless area 6-2, and the wireless communication is not disconnected. .

  FIG. 7 shows a flowchart of the accommodation sector switching process of the optical extension station apparatus (OPTBTS) based on the total transmission power. First, in step 7-1 to step 7-4, the value of total transmission power for each sector is collected for all sectors and stored in the storage device.

  Next, in steps 7-5 to 7-8, it is checked whether the total transmission power value overflows over a predetermined threshold for every sector, and there is an overflowing sector. In this case, information on the opposite sector that forms a ring structure with the sector is retrieved and acquired for the sector in step 7-9. Whether or not the total transmission power has already overflowed in the opposite sector is checked in step 7-10. If it has overflowed, the process proceeds to step 7-7 without performing any processing on the sector, and the next sector is checked. .

  If there is an overflowing sector and the total transmission power has not overflowed in the opposite sector of the sector, the last light extension station apparatus serially connected under the overflowing sector in step 7-11 (OPTBTS) is instructed to disconnect the sector from serial connection.

  Then, in step 7-12, the opposite sector of the overflow sector is instructed to serially connect the succeeding optical overhanging station device (OPTBTS) to the last serially connected optical overhanging station device (OPTBTS). Send it out. As a result, the assigned sector of the optical extension station apparatus (OPTBTS) is switched to the opposite sector.

  When the sector number reaches the last sector number in step 7-7 and the investigation of the overflow of the total transmission power for all sectors is completed, after a predetermined time interval is left in step 7-13 and step 7-14 Returning to step 7-1, the same processing is repeated.

  FIG. 8 shows an example of a processing sequence in a case where the total transmission power does not overflow and is normal. The signal processing unit (# 1) of the first sector and the signal processing unit (# 2) of the second sector of the base unit each have a total transmission power level of its own sector that is normal with respect to the control unit of the base unit. And the control unit of the base unit checks whether there is an overflow in the total transmission power notified from the signal processing unit of each sector. If there is no overflow, the above processing is performed without doing anything. To continue. The master unit is a radio base station apparatus (BTS), and the slave unit is an optical extension station apparatus (OPTBTS).

  FIG. 9 shows an example of a processing sequence for changing the accommodating sector of the slave unit due to the total transmission power overflow. In FIG. 9, the slave unit (C) and the slave unit (D) are serially connected in this order under the signal processing unit (# 1) of the first sector of the master unit, and the signal of the second sector of the master unit. It is assumed that the slave unit (E) and the slave unit (F) are serially connected in this order under the processing unit (# 2).

  The signal processing unit (# 1) of the first sector reports the total transmission power overflow to the control unit of the base unit, and the total transmission power is normal level from the signal processing unit (# 2) of the second sector to the control unit. When there is a notification to the effect, the control unit of the base unit detects that the total transmission power overflow has occurred in the signal processing unit (# 1) of the first sector, and the first The processing for switching the slave unit to the signal processing unit (# 2) of the second sector with the smaller total transmission power, which is opposite to the signal processing unit (# 1) of the sector, is started.

  In order to perform the above processing, the signal processing of the first sector is performed from the signal processing unit (# 1) of the first sector to the changeover switch of the last slave unit (D) serially connected thereto. Disconnect the serial connection with the section (# 1), send a control signal for serial connection in the reverse direction, and send the control signal for the serial connection in the reverse direction from the signal processing section (# 2) of the second sector to the last serially connected slave unit A control signal instructing serial connection with the slave unit (D) is sent to the changeover switch of (F).

  Thereafter, the signal processing unit (# 1) of the first sector and the signal processing unit (# 2) of the second sector respectively notify the control unit of the master unit of the total transmission power of the own sector, and The control unit of the machine checks whether there is an overflow in the total transmission power notified from the signal processing unit of each sector.

  FIG. 10 shows an example of a sequence process in which the accommodation destination of the slave unit is switched due to the total transmission power overflow and then the switching is restored due to the overflow of the switching destination sector. In FIG. 10, the slave unit (C) and the slave unit (D) are serially connected in this order under the signal processing unit (# 1) of the first sector of the master unit, and the signal of the second sector of the master unit is displayed. It is assumed that the slave unit (E) and the slave unit (F) are serially connected in this order under the processing unit (# 2).

  The control unit of the master unit detects that the total transmission power overflow has occurred in the signal processing unit (# 1) of the first sector, and the signal processing unit (# 1) of the first sector having the overflow The process of switching the slave unit to the signal processing unit (# 2) of the second sector facing the start of the slave unit (D) of the last subordinate to the signal processing unit (# 1) of the first sector is started. A control signal for disconnecting the serial connection with the signal processing unit (# 1) of the first sector and the serial connection in the reverse direction is sent to the changeover switch, and the signal processing unit (# 2) of the second sector The control signal instructing the serial connection with the slave unit (D) is sent to the changeover switch of the last slave unit (F) under ().

  Thereafter, the signal processing unit (# 1) of the first sector and the signal processing unit (# 2) of the second sector respectively notify the control unit of the master unit of the total transmission power of the own sector, and The control unit of the machine checks whether there is an overflow in the total transmission power notified from the signal processing unit of each sector, and there is a total transmission power overflow in the signal processing unit (# 2) of the second sector Is detected, the control unit switches the last slave unit (D) from the serial connection of the signal processing unit (# 2) of the second sector via the signal processing unit (# 2) of the second sector. An instruction signal is transmitted, and a control signal for adding the slave unit (D) to the serial connection is transmitted from the signal processing unit (# 1) of the first sector to the slave unit (C).

  Thereafter, the signal processing unit (# 1) of the first sector and the signal processing unit (# 2) of the second sector respectively notify the control unit of the master unit of the total transmission power of the own sector, and The control unit of the machine checks whether there is an overflow in the total transmission power notified from the signal processing unit of each sector.

  Next, FIG. 11 shows a flowchart of a process of switching the accommodation sector of the optical extension station apparatus (OPTBTS) based on the interference wave level observed in each slave unit. First, in step 11-1 and step 11-2, the sector number m is set to the initial value 1, the slave unit number n is set to the initial value 1, and in steps 11-3 to 11-7, all sectors are set. The interference wave level of each slave unit under each sector is collected and stored in a storage device.

  Next, in steps 11-8 to 11-11, it is checked whether or not the interference wave level of the slave unit under each sector overflows over a predetermined threshold over all sectors, and the overflowing sector is determined. If it exists, the information of the opposite sector that forms a ring structure with the sector is searched and acquired for the sector in step 11-12.

  In the opposite sector, whether or not the interference wave level has already overflowed to the subordinate slave unit is checked by step 11-13, and if it has overflowed, the process proceeds to step 11-10 without performing any processing for the sector, Check for the next sector.

  When the interference wave level of the slave unit does not overflow in the opposing sector and the total interference wave level of the opposing sector is lower than the total interference wave level of the local sector, in step 7-14, the slave unit that has overflowed is Indicates that the sector is disconnected from the serial connection. In step 11-15, an instruction is sent to the opposite sector to add a slave unit to the subordinate serial connection. Thereby, the accommodation sector of the slave unit is switched.

  When the sector number reaches the last sector number in step 11-10 and the investigation of the interference wave level overflow for all sectors is completed, after a predetermined time interval is left in steps 11-16 and 11-17, Returning to step 11-1, the same processing is repeated.

  The interference wave level indicates how much radio power is received from a plurality of portable terminals for each antenna of each slave unit, and the interference wave level increases as the number of portable terminals in communication increases. To increase. The interference wave level of each serially connected slave unit is superimposed by the signal processing unit of the accommodation sector, and if the interference wave level in each sector overflows, a new mobile terminal can be connected in that sector become unable.

  Therefore, the slave unit under the sector whose interference wave level has overflowed is switched to a sector with a low total interference wave level facing the ring connection configuration, so that the total interference wave level is biased between the opposing sectors. It is mitigated and it is possible to avoid a decrease in communication service that makes it impossible to connect a new mobile terminal due to interference wave level overflow.

  Since the information on the interference wave level can be collected individually for each slave unit, all the slave units on the rear side from the slave unit in which the interference wave level overflow has been detected in the serial unit are detected once. Can be configured to instruct the switching of the serial connection to the opposite sector.

  FIG. 12 shows an example of the processing sequence of the present invention when no interference wave level overflow occurs. The signal processing unit (# 1) of the first sector of the master unit receives the reports of the interference wave levels from the slave units (B), slave units (C), and slave units (D) under its control. Notify the control unit of the base unit.

  The signal processing unit (# 2) of the second sector receives the report of the interference wave level from the slave unit (E) and the slave unit (F), and notifies the control unit of the base unit of the interference wave level. To do. The control unit of the master unit checks whether there is an overflow in the interference wave level, and continuously monitors the interference wave level in a sequence in the same manner.

  FIG. 13 shows an example of a processing sequence of the present invention when an interference wave level overflow occurs. The signal processing unit (# 1) of the first sector of the master unit receives the reports of the interference wave levels from the slave units (B), slave units (C), and slave units (D) under its control. Notify the control unit of the base unit. The signal processing unit (# 2) of the second sector receives the report of the interference wave level from the slave unit (E) and the slave unit (F), and notifies the control unit of the base unit of the interference wave level. To do.

  When the control unit of the master unit checks whether there is an overflow in the interference wave level and detects that an interference wave level overflow has occurred in the slave unit (C) under the first sector (# 1). The process for switching the slave unit to the opposite sector (# 2) having a low total interference wave level is started, and the subordinate serially connected slave unit (C) and the subsequent slave unit (D) are switched. A control signal for disconnecting from the serial connection of the signal processing unit (# 1) of the first sector and reverse serial connection is sent to the switch, and the signal processing unit (# 2) of the second sector is transmitted. A control signal instructing serial connection with the slave unit (D) is transmitted to the changeover switch of the last slave unit (F) connected serially thereunder.

  Thereafter, the signal processing unit (# 1) of the first sector notifies the control unit of the parent unit of the interference wave level of the slave unit (B) under its control, and the signal processing unit (# 2) of the second sector ) Notifies the control unit of the master unit of the interference wave levels of the slave unit (C), slave unit (D), slave unit (F), and slave unit (E) under the subordinate unit. It is always checked whether there is an overflow in the interference wave level notified from the signal processing unit of the sector.

  FIG. 14 shows an application example in which an optical overhang station device (OPTBTS) according to the present invention is arranged on a railway line or a highway. As shown in the figure, the optical overhang station apparatus (OPTBTS) is connected in a ring shape through two sectors in the radio base station apparatus (BTS).

  Split the light projecting station device (OPTBTS) connected in a ring shape into a left group and a right group at any point along the railroad or highway, and the left group and right group A station apparatus (OPTBTS) is configured to be serially connected under the control of two opposing sectors.

  Especially on expressways, traffic congestion is likely to occur on one side of the up lane or down lane, or in specific sections such as near the exit of the tunnel, and the location where the traffic occurs varies depending on the time of day, day of the week, etc. . In places where traffic jams occur, the number of communications of mobile terminals occurs more. Therefore, more mobile terminals can be connected by adjusting the branch point of the optical overhanging station device (OPTBTS) so that more optical overhanging station devices (OPTBTS) are serially connected to places where traffic congestion is likely to occur. It becomes possible to do.

  In addition, since the serially connectable optical overhang station (OPTBTS) can be installed over a wide range of about 20 km, there are occasional venues, such as large venues where many people sometimes gather, and downtown areas. It is possible to connect more portable terminals by adjusting the number of serially connected optical overhang station devices (OPTBTS).

It is a figure which shows the connection structure of the radio base station apparatus and light extension station apparatus by this invention. It is a figure which shows the example of the change of the serial connection of the light extension station apparatus by this invention. It is a figure which shows the structure of the radio base station apparatus of this invention, and a light extension station apparatus, and its 1st connection form. It is a figure which shows the structure of the light projection station apparatus of this invention, and its 2nd connection form. It is a figure which shows the structural example of the format of the signal transmitted / received between the wireless base station apparatus of this invention, and an optical extension station apparatus. It is a figure which shows each radio | wireless area covered with the antenna of each light extension station apparatus. It is a figure which shows the flowchart of the accommodation sector switching process of the light extension station apparatus based on the total transmission power of this invention. It is a figure which shows the example of a process sequence in the case of the normal time without the overflow of total transmission power. It is a figure which shows the example of a processing sequence of the accommodation destination sector change of the subunit | mobile_unit by total transmission power overflow. It is a figure which shows the example of a sequence process which returns to the original after switching the accommodating place of the subunit | mobile_unit by total transmission power overflow. It is a figure which shows the flowchart of the accommodation sector switching process of the light extension station apparatus based on the interference wave level of this invention. It is a figure which shows the example of a processing sequence in the case of the normal time without interference wave level overflow. It is a figure which shows the example of a processing sequence when the overflow of an interference wave level generate | occur | produces. It is a figure which shows the example of application which has arrange | positioned this invention along railroads or a highway. It is a figure which shows the structural example of a mobile radio | wireless communications system. It is a figure which shows the connection structure of the conventional radio base station apparatus and a light extension station apparatus. It is a figure which shows the operation | movement at the time of the conventional total transmission power overflow.

Explanation of symbols

1-1 Radio base station equipment (BTS)
1-2 Optical overhanging station equipment (OPTBTS)

Claims (4)

A method of switching accommodation sectors of a light extension station device that is accommodated in a signal processing unit of each sector of a radio base station device and that changes the accommodation destination of a serially connected light extension station device,
At least two first and second sector signal processing units of the radio base station device are connected to each other and the serially connected last light extension station devices are connected to each other. A changeover switch is provided to change the connection direction of the serial connection.
From the signal processing unit of one of the first and second sectors, a control signal for identifying the optical overhanging station device and disconnecting the optical overhanging station device from the serial connection is sent to each serially connected optical overhanging station device. Send
From the signal processing section of the first and second other sectors, a control signal for identifying the light projecting station device and adding the light projecting station device to the serial connection is transmitted,
Switching the accommodation sector of the light extension station device, wherein the light extension station device switches the connection direction of the serial connection by the changeover switch according to the control signal from the signal processing unit of the first or second sector. Method. In the radio base station apparatus that accommodates the serially connected light projecting station apparatus in the signal processing unit of each sector,
An optical overhanging station provided with a changeover switch for switching the connection direction of the serial connection while the last optical overhanging station devices serially connected to the signal processing units of at least two first and second sectors are connected to each other A device is serially connected to the signal processing units of the first and second sectors;
From the signal processing unit of one of the first and second sectors, a control signal for identifying the optical overhanging station device and disconnecting the optical overhanging station device from the serial connection is sent to each serially connected optical overhanging station device. And a means for transmitting a control signal for identifying the optical overhanging station device and adding the optical overhanging station device to the serial connection from the signal processing unit of the other sector of the first and second sectors. A wireless base station device.   It is determined whether or not the total transmission power of the signal processing units of the first and second sectors exceeds a predetermined threshold, and the total transmission power of the signal processing unit of the first or second sector is a predetermined threshold If the total transmission power exceeds the predetermined threshold value, the signal processing unit of the sector whose total transmission power exceeds the predetermined threshold is caused to transmit the control signal for disconnecting the light projecting station device, and the signal processing of the sector whose total transmission power does not exceed the predetermined threshold The radio base station apparatus according to claim 2, further comprising a control unit that transmits the control signal for adding a light projecting station apparatus to the unit.   The total interference wave level for each sector of each of the optical extension station devices serially connected to the signal processing units of the first and second sectors is observed, and the interference wave level of each of the optical extension station devices exceeds a predetermined threshold value. If the interference wave level of the overhanging station apparatus exceeds a predetermined threshold, the control signal for disconnecting the overhanging station apparatus is transmitted to the signal processing unit of the sector having the larger total interference wave level. The radio base station apparatus according to claim 2, further comprising: a control unit that transmits the control signal for adding a light projecting station apparatus to a signal processing unit of a sector having a smaller total interference wave level.

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