JP2010062918A - Antenna beam pattern control method, base station device, and wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna beam pattern control method and the like, in which interference is prevented, by providing the antenna beam pattern control method capable of switching an antenna beam pattern at high speed, base station device and wireless communication system. <P>SOLUTION: The antenna beam pattern control method in a base station device, that performs wireless communication with a terminal station device, includes the steps of: detecting a position of the terminal station device on the basis of a transmission signal transmitted from the terminal station device; outputting an output signal on the basis of position information or information on a time at which the terminal station device passes a wireless communication area of the base station device; and generating any one antenna beam pattern included in a first antenna beam pattern group or in a second antenna beam pattern group on the basis of the output signal, wherein the second antenna beam pattern group includes antenna beam patterns obtained by dividing an antenna beam pattern included in the first antenna beam pattern group. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an antenna beam pattern control method, a base station apparatus, and a radio communication system.

  In a wireless communication system, a base station device (hereinafter referred to as “base station”) or a terminal station device (hereinafter referred to as “terminal station”) may be interfered by radio waves from other base stations or other terminal stations.

  FIGS. 15A to 15D are diagrams illustrating examples of interference paths. For example, as shown in FIG. 15A, when adjacent cells use the same channel (or the same frequency), the terminal station 600-1 at the cell edge causes interference in the downlink from the base station 500-2 of the adjacent cell. You may receive it. Also, as shown in FIG. 5B, the base station 500-1 may receive interference from the terminal station 600-2 in the adjacent cell on the uplink of the terminal station 600-1 in the cell. As shown in FIGS. 2C and 2D, there is also an interference path when a wireless communication method based on a TDD (Time Divisional Duplex) method is used.

  In order to avoid such interference and to effectively use the frequency, there is a smart antenna technology. As smart antenna technology, for example, the main axis of the antenna beam pattern is moved in accordance with the movement of the terminal station according to the movement of the terminal station (antenna beam forming), or the antenna beam pattern is selected from a plurality of antenna beam patterns. There are switching (multi-beam antenna) etc. according to the movement of the station.

There are the following patent documents as conventional examples using this type of antenna technology.
JP 2007-13611 A

  However, in order to direct the antenna beam pattern to a terminal station such as a train moving at a high speed, the base station performs a huge amount of processing at a high speed in order for the terminal station to follow the antenna.

  Further, in order to switch the antenna beam pattern from a plurality of antenna beam patterns, the base station switches the beam pattern at a high speed and matches the beam pattern to the terminal station moving at a high speed.

  The above-mentioned Patent Document 1 uses various determination criteria such as a reception S / N ratio and a local station position in order to create an antenna beam pattern, and the processing is slowed accordingly.

  Accordingly, one of the objects is to provide an antenna beam pattern control method, a base station apparatus, and a radio communication system that can switch antenna beam patterns at high speed.

  Another object is to provide an antenna beam pattern control method that prevents interference.

  According to one aspect, in an antenna beam pattern control method in a base station apparatus that performs radio communication with a terminal station apparatus, detecting a position of the terminal station apparatus based on a transmission signal transmitted from the terminal station apparatus; A step of outputting an output signal based on the position information or a passage time information of a radio communication area of the base station device of the terminal station device, and a first antenna beam pattern group or a second based on the output signal Generating any one antenna beam pattern included in the antenna beam pattern group, wherein the second antenna beam pattern group is an antenna beam obtained by dividing the antenna beam pattern included in the first antenna beam pattern group. Includes patterns.

  According to another aspect, in the base station apparatus that performs radio communication with the terminal station apparatus, the detection unit that detects the position of the terminal station apparatus based on a transmission signal transmitted from the terminal station apparatus, and the position information Alternatively, a time monitoring unit that outputs an output signal based on passage time information of a radio communication area of the base station device of the terminal station device, and a first antenna beam pattern group or a second antenna based on the output signal An antenna beam pattern generation unit for generating any one antenna beam pattern included in the beam pattern group, and the antenna beam patterns included in the first and second antenna beam pattern groups are adjacent antenna beam patterns. And the second antenna beam pattern group is included in the first antenna beam pattern group. An antenna beam pattern obtained by dividing the antenna beam pattern.

  Further, according to another aspect, in a wireless communication system in which wireless communication is performed between a terminal station device and a base station device, the terminal station device moves in a first or second direction, and the base station device is the terminal The base station apparatus is arranged on a moving path of the station apparatus, and the base station apparatus detects a position of the terminal station apparatus based on a transmission signal transmitted from the terminal station apparatus, and the position information or the terminal A time monitoring unit that outputs an output signal based on passage time information of a radio communication area of the base station device of the station device, and a first antenna beam pattern group or a second antenna beam pattern group based on the output signal An antenna beam pattern generation unit that generates any one of the antenna beam patterns included in the first antenna beam pattern group, and the antenna beam pattern generation unit included in each of the first and second antenna beam pattern groups. Na beam pattern has an adjacent antenna beam pattern and each overlapping range, wherein the second antenna beam pattern group includes an antenna beam pattern obtained by dividing the antenna beam patterns included in the first antenna beam pattern group.

  An antenna beam pattern control method, a base station apparatus, and a radio communication system that can switch antenna beam patterns at high speed can be provided. Further, it is possible to provide an antenna beam pattern control method or the like that prevents interference.

  Hereinafter, the best mode for carrying out the invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration example of a wireless communication system 10. The radio communication system 10 includes base stations 100-1 and 100-2, terminal stations 200-1 and 200-2, and a center station 300. In the wireless communication system 10, for example, the base station 100-1 and the terminal station 200-1 are wireless sections. The center station 300 monitors malfunctions of the base stations 100-1 and 100-2 and the terminal stations 200-1 and 200-2 and performs various controls.

  In the present embodiment, the terminal station 200 is a train that moves at high speed, and its movement route is known and does not change on a short-term time scale, and the movement direction is random in two directions (up and down directions). In addition, the travel schedule is determined by the schedule.

  In the present embodiment, the base station 100 is a base station installed along a track, for example.

  FIG. 2 is a diagram illustrating a configuration example of a wireless communication system 10 including base stations 100-1 to 100-3 and a terminal station (train) 200. Each of the base stations 100-1 to 100-3 has an antenna coverage range of, for example, 180 deg, and switches the beam pattern of the antenna to be applied among the multi (multiple) beam antennas according to the movement of the terminal station 200. Perform wireless communication.

  FIG. 3 is a diagram illustrating a configuration example of the base station 100. The base station 100 includes a path arrival direction detection unit 110, a path arrival direction monitoring unit 120, a time monitoring unit 140, a weight control unit 160, and an antenna beam pattern generation unit 180.

  The path arrival direction detection unit 110 includes a plurality of multipliers 111-1 to 111-n (n is an integer of 2 or more), an adder 112, a time averaging unit 113, and a DoA estimation unit 114.

  Multipliers 111-1 to 111 -n multiply the reception signals from adjacent reception antennas 181-1 to 181 -n and output the result to adder 112.

  The adder 112 adds the signals from the multipliers 111-1 to 111-n and outputs the result to the time averaging unit 113.

  The time average unit 113 obtains a time average θm for a certain time with respect to the signal from the adder 112 and outputs it to the DoA estimation unit 114.

  The DoA estimation unit 114 estimates the path arrival direction θ of the terminal station 200 based on the time average θm. The DoA estimation unit 114 outputs a signal corresponding to the path arrival direction θ (the position of the terminal station 200) to the path arrival direction monitoring unit 120.

  Based on the signal from the path arrival direction detection unit 110, the path arrival direction monitoring unit 120 determines whether the terminal station 200 is moving according to the time diagram, whether the movement speed is slow, or the terminal station 200 is stopped. Is detected and the information is output to the time monitoring unit 140.

  The time monitoring unit 140 uses the information from the path arrival direction monitoring unit 120 and the train time diagram to arrive at the arrival time when the terminal station 200 arrives at the wireless communication area of the multi-beam antenna of the base station 100, and the position of the terminal station 200. And a selection signal is output to the weight control unit 160 at a specific time.

  Weight control section 160 generates a weight signal based on the selection signal and outputs it to antenna beam pattern generation section 180. The antenna beam pattern generation unit 180 generates various antenna beam patterns based on the weight signal.

  Further, when an emergency signal is input, the weight control unit 160 outputs a weight signal that generates an antenna beam pattern that matches the state of the terminal station 200. Furthermore, when a manual setting signal is input, the weight control unit 160 can manually select (or switch) the antenna beam pattern, and outputs a weight signal corresponding to the selection.

  The antenna beam pattern generation unit 180 includes a plurality of reception antennas 181-1 to 181-n, a plurality of multipliers 182-1 to 182-n, and an adder 183.

  Each of the receiving antennas 181-1 to 181-n receives a transmission signal from the terminal station 200.

  Each multiplier 182-1 to 182-n multiplies the reception signal from each reception antenna 181-1 to 181-n and the weight signal from the weight control unit 160, and generates a weighted reception signal corresponding to the weight signal. Output.

  The adder 183 adds the signals from the multipliers 182-1 to 182-n, generates a desired antenna beam pattern, and outputs it.

  Assume that the base station 100 of this embodiment can switch between three types of antenna beam patterns. Of course, you may make it switch between two types or four or more types of antenna beam patterns. 4A to 4D are diagrams showing examples of antenna beam patterns.

  As shown in these drawings, for example, the antenna beam pattern (BP0) included in the widest first group, the antenna beam patterns (BP1 to BP3) included in the second group, and the narrowest third group Are antenna beam patterns (BP11 to BP33).

  The antenna beam pattern (BP0) included in the first group has, for example, a width of about 200 deg from −10 to 190 deg as a cover range.

  The antenna beam patterns (BP1 to BP3) included in the second group include three antenna beam patterns BP1 to BP3 obtained by dividing the antenna beam pattern (BP0) included in the first group into three. For example, BP1 covers a range from -10 to 70 deg, BP2 from 60 to 130 deg, and BP3 from 120 to 190 deg. FIG. 5 is a diagram illustrating an example of the antenna beam pattern BP2.

  Here, the antenna beam patterns (BP1 to BP3) included in the second group each have an overlap portion (overlap range) of about 5 to 10 degrees. This is because, for example, when the antenna beam pattern is switched from BP1 to BP2, it is possible to follow the switching of the antenna beam pattern to the terminal station 200 that moves at high speed while performing the processing. Therefore, in order to divide the antenna beam pattern, it is allowed that each antenna beam pattern has a partially overlapping range in addition to preventing each antenna beam pattern from having an overlapping range (strict division). You can also do (nonstrict division). Furthermore, when the antenna beam pattern obtained by the division is combined, not only when the angle range covered by the original antenna beam pattern is equivalent, but also when the angle range covered by the original antenna beam pattern decreases or increases. Can be included.

  The antenna beam patterns (BP11 to BP33) included in the third group are further divided into three antenna beam patterns (BP1 to BP3) included in the second group to form an antenna beam pattern having a width of 30 deg. . The antenna beam patterns (BP11 to BP33) of the third group also have overlapping portions.

  As described above, in this embodiment, the antenna beam pattern has a total of 15 antenna beam patterns of three types, and the base station 100 switches between the antenna beam pattern groups. The base station 100 covers the antenna coverage range with these antenna beam patterns. Note that the number of antenna beam patterns is an example, and the second and third antenna beam patterns may be composed of antenna beam patterns divided into four or five.

  FIG. 6 is a diagram illustrating a configuration example of the path arrival direction monitoring unit 120, the time monitoring unit 140, and the weight control unit 160.

  The path arrival direction monitoring unit 120 includes a speed detection unit 121, a speed comparison unit 122, a delay detection unit 123, and a NOR circuit 124.

  The speed detection unit 121 detects the speed of the terminal station 200 by differentiating the θ signal (path arrival direction signal) from the path arrival direction detection unit 110 with a sampling period.

  The speed comparison unit 122 compares the speed of the terminal station 200 detected by the speed detection unit 121 with a threshold (moving speed known in advance based on an operation table or the like), and is the same as the threshold (same as usual) or faster than the threshold ( It is determined whether it is earlier than normal or later than the threshold (slower than normal), and the result is output to the clock selector 147. Further, the speed comparison unit 122 detects whether or not the terminal station 200 is stopped based on the speed of the terminal station 200. If the terminal station 200 is stopped, for example, “1” is set. Output to the circuit 124.

  The delay detection unit 123 compares the θ signal with the θ ′ signal covered by the actually set antenna beam pattern. If the θ signal is included in the θ ′ signal, “0” is included. If not, “1” is output. That is, the delay detection unit 123 detects whether the detected path arrival direction θ (for example, 20 deg) is within the range of the actually set antenna beam pattern (−10 to 60 deg), thereby arriving at the terminal station 200. Detect time delays.

  The NOR circuit 124 outputs a NOR between the output signal of the speed comparison unit 122 and the output signal of the delay detection unit 123. That is, the NOR circuit 124 operates when the terminal station 200 moves normally (the output of the speed comparison unit 122 is “0”) and is located within the antenna beam pattern set by the terminal station 200 (delay detection unit). When the output of 123 is “0”), “1” (count permission signal) is output. Otherwise, the NOR circuit 124 outputs “0” (count non-permission signal).

  The time monitoring unit 140 includes a clock generation unit 141, a time stamp 142, an antenna beam pattern change timing generation unit (hereinafter referred to as a change timing generation unit) 143, an antenna beam pattern selection unit 144, a θ conversion unit 145, and a frequency division. 146, a clock selector 147, and a count operation controller 148.

  The clock generation unit 141 is a clock generation source for creating a time stamp, and generates a clock of about 10 Hz, for example.

  The time stamp 142 creates a time stamp (xx hour xx minutes xx seconds) based on the clock from the clock generator 141.

  The change timing generation unit 143 generates a timing signal indicating the timing at which the train (terminal station 200) enters the reception range of the base station 100, based on the time stamp and the train timetable information.

  When the timing signal is input from the change timing generation unit 143, the antenna beam pattern selection unit 144 performs weight control on a selection signal for presetting the initial antenna beam pattern (for example, presetting the antenna beam pattern from BP0 to BP1). Output to the unit 160. Further, when a clock signal is input from the count operation control unit 148, the antenna beam pattern selection unit 144 outputs a selection signal for selecting an antenna beam pattern corresponding to the clock.

  The θ conversion unit 145 converts the selection signal from the antenna beam pattern selection unit 144 into a θ ′ signal indicating the path arrival direction θ ′ and outputs it.

  The frequency divider 146 divides the clock from the clock generation unit 141 and outputs, for example, each of the clock signals divided by 1/2, 1/4, and 1/8.

  The clock selection unit 147 selects a clock signal corresponding to the output from the speed comparison unit 122. For example, when an output signal indicating “faster than normal” is input from the speed comparison unit 122, the clock selection unit 147 selects a clock signal divided by “½” and indicates “slower than normal”. When the output signal is input, the clock signal divided by “1/8” is selected.

  The count operation control unit 148 outputs the clock signal from the clock selection unit 147 to the antenna beam pattern selection unit 144 when the signal indicating the count permission (for example, “1”) is input from the NOR circuit 124, and does not permit the count. When a signal indicating (for example, “0”) is input, the clock signal is not output.

  The weight control unit 160 includes first to third weight generation units 161 to 163 and a weight switching unit 164.

  The first weight generation unit 161 outputs a weight signal so that a desired antenna beam pattern is generated by the antenna beam pattern generation unit 180 based on a weight manual setting signal input from the outside. For example, the first weight generator 161 generates a weight signal based on the weight manual setting signal so that any one of the 13 antenna beam patterns BP0, BP1 to BP3, and BP11 to BP33 is generated. Output.

  Based on the selection signal from the antenna beam pattern selection unit 144, the second weight generation unit 162 outputs a weight signal so that a beam pattern corresponding to the selection signal is generated by the antenna beam pattern generation unit 180. For example, the second weight generation unit 162 outputs a weight signal for generating the beam patterns BP1 to BP3.

  Based on the arrival direction (θ signal) from the path arrival direction detection unit 110, the third weight generation unit 163 outputs a weight signal so that a beam pattern corresponding to the arrival direction is generated. For example, the third weight generating unit 163 outputs a weight signal that generates the beam patterns BP11 to BP33.

  The weight switching unit 164 selects one of the weight signals output from the first to third weight generation units 161 to 163 based on the emergency / normal signal and the output signal from the speed comparison unit 122. Output.

  In the weight switching unit 164, for example, an emergency signal is input from the outside (the emergency / normal signal is “1” indicating emergency), and the terminal station 200 is “stopped” (the signal from the speed comparison unit 122 is “stopped”). "1" indicating "is present"), the wait signal from the first wait generator 161 is selected and output.

  The weight switching unit 164 receives the first weight when, for example, an emergency signal is input from the outside and the terminal station 200 is “normal” (the signal from the speed comparison unit 122 is “0” indicating “normal”). A wait signal from the generator 161 is selected.

  Further, the weight switching unit 164 receives, for example, an external emergency signal from the outside (“0” indicating that the emergency / normal signal is normal) and the terminal station 200 is “stopped”. The wait signal is selected.

  Furthermore, the weight switching unit 164 selects the weight signal from the second weight generation unit 162 when no emergency signal is input from the outside and the terminal station 200 is “normal”, for example.

  Next, the operation of the base station 100 will be described. 7 to 11 are flowcharts showing an operation example of the base station 100. In the present embodiment, adjacent base stations use different frequencies, and the terminal station 200 is a train.

  As shown in FIG. 7, when the base station 100 starts this process (S10), it determines whether or not there is an emergency (S11). The base station 100 determines whether or not an emergency signal is input to the weight switching unit 164, for example. The emergency signal may be input from the center station 300, for example, or may be input to the base station 100 manually. For example, an emergency situation such as an accident occurs in the terminal station 200 located within the cell range of the base station 100.

  When it is determined that the base station 100 is in an emergency situation (Yes in S11), the base stations on both sides of the base station 100 where the emergency situation has occurred are closed, and the base station 100 has a frequency band used by the base stations on both sides. (For example, the entire frequency band) is used (S121 in FIG. 8). Since the base station 100 can use the frequencies used by the adjacent base stations, the base station 100 having the terminal station 200 under the emergency can send and receive a large amount of data. For example, information on the terminal station 200 is transmitted to other terminals. It can be obtained from the station. For example, when the center station 300 transmits a control signal to the base station 100 or both adjacent base stations, the adjacent base stations are closed or use of all frequencies is permitted.

  When the base station 100 determines that the situation is an emergency (Yes in S11), the base station 100 selects and sets a specific antenna beam pattern (S122 in FIG. 8). The antenna beam pattern generation unit 180 generates a specific antenna beam pattern by the weight switching unit 164 of the base station 100 selecting and outputting the weight signal from the first weight generation unit 161.

  Note that both the processing of S121 and S122 may be performed, or only one of them may be performed.

  On the other hand, when the base station 100 determines that it is not an emergency (No in S11), it determines whether it is time for the train to pass (S13). For example, the change timing generation unit 143 of the time monitoring unit 140 compares the time from the time stamp 142 with the time diagram information of the train held therein to determine whether the time is that the train passes through the area. .

  When it is not time for the train to pass, that is, when neither the ascending train nor the descending train is passing time (No in S13), the base station 100 sets the antenna beam pattern BP0 by the weight control unit 160 (S15), and returns to the process of S10. . For example, when the antenna beam pattern selection unit 144 does not output a preset selection signal, the second weight generation unit 162 outputs a weight signal of the antenna beam pattern BP0, so that the weight control unit 160 outputs this weight signal. Thus, the antenna beam pattern BP0 can be set.

  On the other hand, when it is time for the train to pass, that is, when it is time for either the up train or the down train (Yes in S13), the base station 100 determines whether both the up train and the down train pass or only one of them. It is determined whether or not it passes (S14). The change timing generation unit 143 can determine the same as in S13.

  At the time when only one of the trains passes (“one” in S14), the base station 100 uses all its usable frequencies (for example, (f1 + f2)) (S16), and the antenna beam pattern BP1, The antenna beam pattern BP3 is set for the down train (S17). For example, the change timing generation unit 143 outputs a timing signal to the antenna beam pattern selection unit 144 at a timing when an up train (or down train) enters the coverage range of the base station 100. The antenna beam pattern selection unit 144 outputs a weight signal for generating the beam pattern BP1 (or BP3) by the second weight generation unit 162. In this way, the base station 100 switches from the antenna beam pattern BP0 included in the first group to the antenna beam pattern BP1 included in the second group.

  In the processes from S13 to S17, an antenna beam pattern is set based on time information by a time diagram or the like. Therefore, processing can be performed faster than when processing is performed while waiting for the arrival direction θ, and the antenna beam pattern can be switched following the terminal station 200 moving at high speed. The same applies to S30 to S32 described later.

  Next, the base station 100 sets the antenna beam pattern to BP1 (or BP3) from a certain time before the time when the train arrives in its coverage range (for example, 3 minutes) (S18 in FIG. 9), and enters the area. It is detected whether the arrival time has passed the scheduled time (S19). That is, the base station 100 sets the antenna beam pattern to BP1 (or BP3) based on the time schedule, sets it as BP1 (or BP3) until the train actually enters, and the time when the train actually enters the area. Is detected.

  For example, when the base station 100 receives a signal transmitted by a train, the delay detection unit 123 of the path arrival direction monitoring unit 120 receives the path arrival direction θ (θ signal) from the path arrival direction detection unit 110 and sets the set antenna. If it is in the range θ ′ of the beam pattern, that time becomes the arrival time. Since the train may be delayed even in the normal operation state, the base station 100 waits for a predetermined time (for example, 3 minutes) and performs the process of S19.

  If the train does not arrive in the area even after the scheduled time (Yes in S19), the process proceeds to S10.

  On the other hand, when the train arrives in the area (No in S19), the time diagram is updated according to the arrival time of the train, and the antenna beam pattern is changed according to the new time diagram (S20).

  For example, the change timing generation unit 143 has a time management table (or time diagram) including the position and time, and the time is determined by the output from the speed comparison unit 122 (such as a “stopped” signal or an “earlier than normal” signal). Update the management table. Further, the time monitoring unit 140 generates a clock corresponding to the train speed, selects an antenna beam pattern according to the clock, and the weight control unit 160 outputs a weight corresponding to the pattern. Therefore, the time monitoring unit 140 updates the time diagram, and the path arrival direction monitoring unit 120, the time monitoring unit 140, and the weight control unit 160 can change the antenna beam pattern in accordance with the movement to the train.

  Next, the base station 100 determines whether the train is operating on time (S21). For example, it is determined by the delay detection unit 123 in the path arrival direction.

  When the train is not operating on time (No in S21), the base station 100 detects whether the train is stopped (S24). For example, it is detected by the speed comparison unit 122 of the path arrival direction monitoring unit 120.

  When the train is stopped (Yes in S24), the base station 100 changes the antenna beam pattern to a pattern (beam patterns BP11 to BP33) included in the narrowest third group (S25). For example, the beam switching unit 164 switches to the weight from the third weight generation unit 163 based on the signal from the speed comparison unit 122 (“stopped”), thereby changing the beam pattern. Thus, the base station 100 switches from the antenna beam patterns BP1 to BP3 included in the second group to the antenna beam patterns BP11 to BP33 included in the third group.

  Next, when the base station 100 detects that the train has started to move, the antenna beam pattern is restored (again, the antenna beam pattern included in the second group is switched from the third group), and the time diagram is changed. Update (S26). For example, the weight switching unit 164 switches to the weight from the second weight generation unit 162 based on the signal (“normal”) from the speed comparison unit 122. Further, for example, the change timing generation unit 143 updates the time schedule by updating the time management table based on the output from the speed comparison unit 122.

  On the other hand, when the train is not stopped (No in S24), the process proceeds to S20 again.

  When the train is operating on time (Yes in S21), the base station 100 changes the antenna beam pattern according to the movement of the train (S22). For example, the base station 100 changes the antenna beam pattern by the clock selection unit 147 selecting a clock according to the movement of the train and the antenna beam pattern selection unit 144 selecting the antenna beam pattern based on the clock. In the case of an up train, the base station 100 changes the antenna beam pattern, for example, BP1 → BP2 → BP3, and in the case of a down train, the base station 100 changes, for example, BP3 → BP2 → BP1.

  Next, or after the process of S26, the base station 100 sets an initial antenna beam pattern (for example, BP0) when the train moves out of the area of the base station 100 (S23). For example, when the delay detection unit 123 detects that the train has moved outside the range of the antenna beam pattern, the count operation control unit 148 receives a count non-permission signal and does not output a clock signal. At this time, the antenna beam pattern selection unit 144 outputs a signal to the weight control unit 160 so as to generate the antenna beam pattern of BP0.

  Next, the process proceeds to S10 and the above-described process is repeated.

  On the other hand, when both the up train and the down train are detected by the time monitoring unit 140 (“both” in S14), the base station 100 divides the frequency allocated to itself (for example, f1 + f2) into two, and one (for example, f1) is assigned to the up train, and the other (eg, f2) is assigned to the down train (S30).

  Next, the weight control unit 160 sets the antenna beam pattern BP1 for the upward train and changes it from BP2 to BP3 in accordance with the movement (S31). For the down train, the weight control unit 160 sets the antenna beam pattern BP3 and changes it from BP2 to BP1 in accordance with the movement. The weight control unit 160 performs the same processing as S22.

  Next, the base station 100 performs the same processing as S18 to S26 shown in FIG. 9 (S32). However, the base station 100 performs processing for the up train and the down train using the frequency divided into two.

  Next, the base station 100 determines whether one of the up train and the down train has moved out of the area of the base station 100 (S33 in FIG. 10). The base station 100 performs the same process as S23.

  When either the up train or the down train moves out of range (Yes in S33), the base station 100 assigns all the frequencies (eg, f1 + f2) assigned to the base station 100 to the trains remaining in the area (S34). .

  Next, when both the down train and the up train move outside the area of the base station 100, the process proceeds to S10 (S35).

  On the other hand, when both the up train and the down train are located in the area of the base station 100 (No in S33), the process proceeds to S32.

  FIG. 11A to FIG. 13C are diagrams illustrating an example of antenna beam pattern control. In this example, the up train moves from 0 deg to 180 deg, and the down train moves from 180 deg to 0 deg. Further, in this example, the up train and the down train enter “10:00” in the antenna receivable range (area) of the base station 100, go out to “10:18”, and move 10 degrees in one minute. The time management table includes, for example, “position” and “time diagram” among the items shown in these drawings.

  FIG. 11A is a diagram illustrating an example in which the weight control unit 160 of the base station 100 sets the antenna beam pattern to BP0 before the upstream train passes through the base station 100 (No in S13 in FIG. 7, S15 ). As shown in the figure, the weight controller 160 of the base station 100 sets the antenna beam pattern to BP0 before the time “10:00”.

  FIG. 11B is a diagram illustrating an example in which the up train moves in the area of the base station 100, and the weight control unit 160 of the base station 100 sets the antenna beam pattern to BP1 (in S14 of FIG. ", S16-S17). At this time, the base station 100 allocates and uses all frequencies (“f1 + f2”) allocated to the base station 100 itself to the upstream train.

  FIG. 11C is a diagram illustrating an example in which both the up train and the down train move to the area of the base station 100 at the same time (“both” in S14 of FIG. 7, S30 to S32). As shown in FIG. 5C, the base station 100 assigns “f1” to the upstream train and “f2” to the downstream train.

  FIG. 12A is a diagram illustrating an example in which either the up train or the down train moves outside the area of the base station 100 (S33 to S35 in FIG. 10). As shown in FIG. 5A, the down train is located at “100 deg” at time “10:00”, while the up train is located at “0 deg” at the same time. Therefore, the base station 100 allocates all frequencies (f1 + f2) to the down train until the time “10:00”. Similarly, after the time “10:10”, the base station 100 assigns all frequencies (f1 + f2) to the upstream train.

  FIG. 12B is a diagram illustrating an example of a case where the upstream train does not move into the area of the base station 100 even after the scheduled time (Yes in S19 in FIG. 9). In this case, the weight controller 160 of the base station 100 changes the antenna beam pattern from BP1 to BP0.

  FIG. 12C is a diagram illustrating an example in which the base station 100 updates the time schedule after detecting the arrival of an upstream train (No in S19 and S20 in FIG. 9). In the example of FIG. 5C, the up train is delayed by 1 minute, and the change timing generation unit 143 of the base station 100 updates to a time diagram delayed by 1 minute. Then, the weight control unit 160 sequentially changes the antenna beam pattern from BP1 to BP3 based on the updated time diagram (with offset).

  FIG. 13A is a diagram illustrating an example in which the antenna beam pattern is changed when the path arrival direction monitoring unit 120 detects that the upstream train is stopped (Yes in S24 of FIG. 9, S25). In the example of FIG. 5A, the weight control unit 160 changes the antenna beam pattern from BP1 to the beam pattern BP12 in the narrowest range.

  FIG. 13B is a diagram illustrating an example of the case where the train starts moving again after the ascending train stops (S26 in FIG. 9). In this case, the weight control unit 160 changes the antenna beam pattern from BP12 to BP1.

  FIG. 13C is a diagram illustrating an example in which the antenna beam pattern is changed in accordance with the movement of the upstream train when the upstream train is operating on time (Yes in S21, S22 to S23). The weight controller 160 of the base station 100 changes the antenna beam pattern from BP2 to BP3 in accordance with the movement of the train, and changes to BP0 in the widest range when the upstream train moves outside the area.

  Since the base station 100 of this embodiment forms an optimal antenna beam pattern even when the terminal station 200 moves at high speed, interference from other terminal stations and base stations can be avoided. Since the base station 100 selects any one of the plurality of types of antenna beam patterns having different detection ranges in accordance with the movement of the train, interference from other terminal stations can be avoided.

  Another example will be described. FIG. 14 is a diagram illustrating another configuration example of the base station 100. Furthermore, a data reproduction unit 190 and a GPS information extraction unit 191 are provided. The base station 100 receives GPS information measured by the terminal station 200. The data reproduction unit 190 reproduces data from the received signal, and the GPS information extraction unit 191 extracts GPS information and outputs the GPS information to the path arrival direction monitoring unit 120. The path arrival direction monitoring unit 120 detects movement or the like of the terminal station 200 based on GPS information that is position information of the terminal station 200 instead of the path arrival direction θ.

  In any of the above-described examples, the antenna beam patterns have been described as examples of the antenna beam patterns included in the first to third groups. Many types of antenna beam patterns, such as four types and five types, may be used.

  The above is summarized as an appendix.

(Appendix 1)
In the antenna beam pattern control method in the base station apparatus that performs radio communication with the terminal station apparatus,
Detecting a position of the terminal station device based on a transmission signal transmitted from the terminal station device;
Outputting an output signal based on the location information or the passage time information of the terminal station device;
Generating one of the antenna beam patterns included in the first antenna beam pattern group or the second antenna beam pattern group based on the output signal, and
The antenna beam pattern control method, wherein the second antenna beam pattern group includes an antenna beam pattern obtained by dividing an antenna beam pattern included in the first antenna beam pattern group.

(Appendix 2)
The antenna beam pattern control method according to appendix 1, wherein the antenna beam patterns included in the first and second antenna beam pattern groups respectively have overlapping ranges with adjacent antenna beam patterns.

(Appendix 3)
The output signal output step outputs an output signal indicating that it is not a passage time when it is not a time that the terminal station device passes based on the passage time information,
The antenna beam pattern control method according to appendix 1, wherein the antenna beam pattern generation step generates an antenna beam pattern having a maximum reception width based on the output signal.

(Appendix 4)
The output signal output step indicates that, based on the passage time information, when the terminal station device enters the receivable range of the antenna of the base station device from the first direction, the output indicates that the receivable range is entered. Output signal,
The antenna beam pattern generation step generates an antenna beam pattern having the first direction in the first antenna beam pattern group as a receivable range based on the output signal,
Further, the frequency of all bands allocated to the base station device is allocated to the terminal station device,
The antenna beam pattern control method according to supplementary note 1, wherein:

(Appendix 5)
In the output signal output step, when the terminal station device enters the receivable range of the antenna of the base station device from the first direction and the second direction based on the passage time information, the output signal output step falls within the receivable range. Outputs an output signal indicating that
The antenna beam pattern generation step generates, based on the output signal, an antenna beam pattern having the first and second directions as a receivable range in the first antenna beam pattern group,
Further, a frequency divided into two of the frequencies of the entire band allocated to the base station device is allocated to each of the terminal station devices from the first and second directions,
The antenna beam pattern control method according to supplementary note 1, wherein:

(Appendix 6)
Further, when the terminal station device in either the first or second direction moves outside the receivable range of the antenna of the base station device, the frequency of the entire band is within the receivable range. Assign to either the terminal station device from the first or second direction;
The antenna beam pattern control method according to appendix 5, wherein:

(Appendix 7)
In the antenna beam pattern generation step, when it is detected in the detection step that the terminal station device is not located within the antenna receivable range of the base station device even after the passage time, the receivable range of the maximum width 4. The antenna beam pattern control method according to appendix 3, wherein an antenna beam pattern having the following is generated.

(Appendix 8)
The output signal step is a time when the position detection step delays the passage time information when it is detected that the terminal station device is located within the antenna receivable range of the base station device after the passage time. The antenna beam pattern control method according to appendix 4, wherein offset is performed by a minute amount.

(Appendix 9)
In the antenna beam pattern generation step, when it is detected in the position detection step that the terminal station apparatus is stopped within the antenna receivable range of the base station apparatus, any one of the second antenna beam pattern groups is selected. 9. The antenna beam pattern control method according to appendix 8, wherein two antenna beam patterns are generated.

(Appendix 10)
The antenna beam pattern generation step generates one antenna beam pattern of the first antenna beam pattern group when movement of the terminal station apparatus is detected in the position detection step. 10. The antenna beam pattern control method according to 9.

(Appendix 11)
In the antenna beam pattern generation step, when it is detected in the position detection step that the terminal station device has moved out of the antenna receivable range of the base station device, an antenna beam pattern having a maximum receivable range is obtained. The antenna beam pattern control method according to appendix 4, wherein the antenna beam pattern control method is generated.

(Appendix 12)
The antenna beam pattern control method according to appendix 1, wherein the transmission signal includes GPS information detected by the terminal station apparatus.

(Appendix 13)
Further, when an emergency signal is input, a frequency assigned to another base station device adjacent to the base station device and a frequency assigned to the base station device are assigned to the terminal station device.
The antenna beam pattern control method according to supplementary note 1, wherein:

(Appendix 14)
In the antenna beam pattern generation step, when an emergency signal is input, any one of the antenna beam patterns included in the first or second antenna beam pattern group is manually selected, and the antenna beam pattern is selected. The antenna beam pattern control method according to appendix 1, wherein the antenna beam pattern control method is generated.

(Appendix 15)
The terminal station device moves in the first or second direction,
The antenna beam pattern control method according to supplementary note 1, wherein the base station apparatus is arranged on a moving path of the terminal station apparatus.

(Appendix 16)
In a base station device that performs wireless communication with a terminal station device,
A detection unit that detects a position of the terminal station device based on a transmission signal transmitted from the terminal station device, and an output based on the location information or passage time information of a radio communication area of the base station device of the terminal station device A time monitoring unit for outputting a signal;
An antenna beam pattern generation unit that generates one of the antenna beam patterns included in the first antenna beam pattern group or the second antenna beam pattern group based on the output signal;
The base station apparatus, wherein the second antenna beam pattern group includes an antenna beam pattern obtained by dividing each antenna beam pattern included in the first antenna beam pattern group.

(Appendix 17)
The base station apparatus according to supplementary note 16, wherein the terminal station apparatus moves in a first or second direction, and the base station apparatus is arranged on a movement path of the terminal station apparatus.

(Appendix 18)
The base station apparatus according to supplementary note 16, wherein the antenna beam patterns included in the first and second antenna beam pattern groups respectively have overlapping ranges with adjacent antenna beam patterns.

(Appendix 19)
In a wireless communication system that performs wireless communication between a terminal station device and a base station device,
The terminal station device moves in the first or second direction,
The base station device is arranged on a movement path of the terminal station device,
Furthermore, the base station apparatus detects a position of the terminal station apparatus based on a transmission signal transmitted from the terminal station apparatus, and wireless communication of the base station apparatus of the position information or the terminal station apparatus A time monitoring unit that outputs an output signal based on area passing time information, and any one antenna beam pattern included in the first antenna beam pattern group or the second antenna beam pattern group based on the output signal And a second antenna beam pattern group including an antenna beam pattern obtained by dividing each antenna beam pattern included in the first antenna beam pattern group. system.

(Appendix 20)
20. The radio communication system according to appendix 19, wherein the antenna beam patterns included in the first and second antenna beam pattern groups respectively have overlapping ranges with adjacent antenna beam patterns.

FIG. 1 is a diagram illustrating a configuration example of a wireless communication system. FIG. 2 is a diagram illustrating another configuration example of the wireless communication system. FIG. 3 is a diagram illustrating a configuration example of a base station. 4A to 4D are diagrams showing examples of antenna beam patterns. FIG. 5 is a diagram illustrating an example of an antenna beam pattern of BP2. FIG. 6 is a diagram illustrating configuration examples of a path arrival direction monitoring unit, a time monitoring unit, and a weight control unit. FIG. 7 is a flowchart showing an operation example of the base station. FIG. 8 is a flowchart showing an operation example of the base station. FIG. 9 is a flowchart showing an operation example of the base station. FIG. 10 is a flowchart showing an operation example of the base station. FIG. 11A to FIG. 11C are diagrams showing an example of antenna beam pattern control. FIG. 12A to FIG. 12C are diagrams showing an example of antenna beam pattern control. FIGS. 13A to 13C are diagrams illustrating an example of antenna beam pattern control. FIG. 14 is a diagram illustrating another configuration example of the base station. FIGS. 15A to 15D are diagrams illustrating examples of interference paths.

Explanation of symbols

10 wireless communication system, 100 (100-1 to 100-3) wireless base station apparatus (base station), 110 path arrival direction detection unit, 120 path arrival direction monitoring unit, 121 speed detection unit, 122 speed comparison unit, 123 delay Detection unit, 124 NOR circuit, 140 time monitoring unit, 143 antenna beam pattern change timing generation unit, 144 antenna beam pattern selection unit, 147 clock selection unit, 148 count operation control unit, 160 wait control unit, 161-163 first to first Third weight generating unit, 164 weight switching unit, 180 antenna beam pattern generating unit, 181-1 to 181-n receiving antenna, 182-1 to 182-n multiplier, 183 adder, 190 data reproducing unit, 191 GPS Information extraction unit, 200 (200-1 to 200-2) Terminal station equipment (terminal station)

Claims (10)

In the antenna beam pattern control method in the base station apparatus that performs radio communication with the terminal station apparatus,
Detecting a position of the terminal station device based on a transmission signal transmitted from the terminal station device;
Outputting an output signal based on the location information or the passage time information of a radio communication area of the base station device of the terminal station device;
Generating one of the antenna beam patterns included in the first antenna beam pattern group or the second antenna beam pattern group based on the output signal, and
The antenna beam pattern control method, wherein the second antenna beam pattern group includes an antenna beam pattern obtained by dividing an antenna beam pattern included in the first antenna beam pattern group.   2. The antenna beam pattern control method according to claim 1, wherein the antenna beam patterns included in the first and second antenna beam pattern groups respectively have overlapping ranges with adjacent antenna beam patterns. The output signal output step outputs an output signal indicating that it is not a passage time when it is not a time that the terminal station device passes based on the passage time information,
2. The antenna beam pattern control method according to claim 1, wherein the antenna beam pattern generation step generates an antenna beam pattern having a maximum reception width based on the output signal. (S13, S15 in FIG. 7) The output signal output step indicates that, based on the passage time information, when the terminal station device enters the receivable range of the antenna of the base station device from the first direction, the output indicates that the receivable range is entered. Output signal,
The antenna beam pattern generation step generates an antenna beam pattern having the first direction in the first antenna beam pattern group as a receivable range based on the output signal,
Further, the frequency of all bands allocated to the base station device is allocated to the terminal station device,
The antenna beam pattern control method according to claim 1. In the output signal output step, when the terminal station device enters the receivable range of the antenna of the base station device from the first direction and the second direction based on the passage time information, the output signal output step falls within the receivable range. Outputs an output signal indicating that
The antenna beam pattern generation step generates, based on the output signal, an antenna beam pattern having the first and second directions as a receivable range in the first antenna beam pattern group,
Further, a frequency divided into two of the frequencies of the entire band allocated to the base station device is allocated to each of the terminal station devices from the first and second directions,
The antenna beam pattern control method according to claim 1. Further, when the terminal station device in either the first or second direction moves outside the receivable range of the antenna of the base station device, the frequency of the entire band is within the receivable range. Assign to either the terminal station device from the first or second direction;
The antenna beam pattern control method according to claim 5.   In the antenna beam pattern generation step, when it is detected in the detection step that the terminal station device is not located within the antenna receivable range of the base station device even after the passage time, the receivable range of the maximum width The antenna beam pattern control method according to claim 4, wherein an antenna beam pattern having the following is generated.   The output signal step is a time when the position detection step delays the passage time information when it is detected that the terminal station device is located within the antenna receivable range of the base station device after the passage time. 5. The antenna beam pattern control method according to claim 4, wherein offset is performed by a minute amount. In the base station device that performs wireless communication with the terminal station device,
A detection unit that detects a position of the terminal station device based on a transmission signal transmitted from the terminal station device, and an output based on the location information or passage time information of a radio communication area of the base station device of the terminal station device A time monitoring unit that outputs a signal;
An antenna beam pattern generation unit that generates any one antenna beam pattern included in the first antenna beam pattern group or the second antenna beam pattern group based on the output signal;
The base station apparatus, wherein the second antenna beam pattern group includes an antenna beam pattern obtained by dividing each antenna beam pattern included in the first antenna beam pattern group. In a wireless communication system that performs wireless communication between a terminal station device and a base station device,
The terminal station device moves in the first or second direction,
The base station device is arranged on a movement path of the terminal station device,
Furthermore, the base station apparatus detects a position of the terminal station apparatus based on a transmission signal transmitted from the terminal station apparatus, and wireless communication of the base station apparatus of the position information or the terminal station apparatus A time monitoring unit that outputs an output signal based on area passing time information, and any one antenna beam pattern included in the first antenna beam pattern group or the second antenna beam pattern group based on the output signal And a second antenna beam pattern group including an antenna beam pattern obtained by dividing each antenna beam pattern included in the first antenna beam pattern group. system.

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