JP2005268977A - Radio access network, radio base station, and transmission output control method used for them and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio base station capable of avoiding radio link down by forecasting the radio link down by bad weather, such as sudden rainfall, in advance. <P>SOLUTION: When a reception level detection section 11 receives a navigation signal from a GPS navigation signal receiving device 2, the reception level detection section 11 detects the reception level. An ODU transmission output control section 12 controls the transmission output of an ODU3, based on the reception level. A navigation signal reception delay detection section 13 detects delay in the reception of the navigation signal, and a radio wave linkdown forecast section 14 forecasts the radio linkdown, based on the delay detection of the navigation signal. A forecast information receiver 15 receives the forecast information of the radio linkdown from other radio base stations by cable or radio. A transmission power/ error correction capability adjustment section 16 adjusts the transmission power/error correction capability of the ODU3, based on the forecast information of the radio linkdown. A forecast information notifier 17 transmits the forecast information of the radio linkdown to other radio base stations by cable or radio. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a radio access network, a radio base station, a transmission output control method used therefor, and a program therefor, and more particularly, a radio link down in a radio access network of a point-to-point system using GPS (Global Positioning System). Related to avoidance by prediction.

  Conventionally, in a radio access network, as a transmission output control, the transmission level of the opposite station received by the own station is monitored only between the own station and the radio opposite station, and the transmission output control is performed by the deterioration of the monitoring result. The transmission output is controlled manually or manually.

  In mobile communication systems, a method has been proposed in which, when a rain sensor detects rain, an optimal transmission output of a base station and a mobile device is calculated from the output signal and an error in GPS radio waves (for example, patents). Reference 1).

JP 10-65596 A

  However, in the above-described conventional radio access network, an unexpected radio link may be down due to sudden rain or the like when the transmission power level is low.

  In addition, in a conventional radio access network, only the transmission output level adjustment between the local station and the radio opposite station is possible, so it is possible to dynamically grasp changes in the situation such as weather deterioration related to the entire network. In addition, there is a problem that an appropriate response cannot be made. Even with the technique described in the above-mentioned Patent Document 1, it is impossible to dynamically grasp a change in the situation such as a worsening weather related to the entire network, and it is not possible to appropriately respond.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and to predict a radio link down due to weather deterioration such as sudden rain in advance and avoid the radio link down, a radio base station, and those The present invention provides a transmission output control method and a program for use in the above.

A radio access network according to the present invention includes a plurality of GPS navigation receivers each receiving a GPS (Global Positioning System) satellite navigation signal and connected to at least one of wired and radio stations facing each other. A radio access network comprising radio base stations,
Means for measuring fluctuations in the reception level of the navigation signal, means for detecting a delay of the navigation signal, and detecting a radio link down between the plurality of radio base stations based on the detected delay of the navigation signal And a means for adjusting the transmission output / error correction capability to the opposite station when the radio link down is detected, each of the plurality of radio base stations.

A radio base station according to the present invention is a radio base station that is equipped with a GPS navigation receiver that receives navigation signals of GPS (Global Positioning System) satellites and that is connected to at least one of wired and radio to an opposing station. There,
Means for measuring fluctuations in the reception level of the navigation signal, means for detecting a delay of the navigation signal, and detecting a radio link down between the plurality of radio base stations based on the detected delay of the navigation signal And means for adjusting the transmission output / error correction capability to the opposite station when the radio link down is detected.

  A transmission output control method according to the present invention includes a GPS navigation receiver that receives navigation signals of GPS (Global Positioning System) satellites, and is connected to at least one of wired and wireless opposing stations. A transmission output control method for performing transmission output control between the radio base stations in a radio access network including a plurality of radio base stations, and measuring a variation in a reception level of the navigation signal on each of the plurality of radio base stations Detecting a delay of the navigation signal, detecting a radio link down between the plurality of radio base stations based on the detected delay of the navigation signal, and detecting the radio link down The transmission output / error correction capability to the opposite station side when adjusted.

  The program of the transmission output control method according to the present invention is equipped with a GPS navigation receiver that receives navigation signals of GPS (Global Positioning System) satellites, and is connected to at least one of wired and wireless opposite opposing stations. A transmission output control method program for performing transmission output control between the radio base stations in a radio access network composed of a plurality of radio base stations, the computer measuring a variation in the reception level of the navigation signal; A process of detecting a delay of the navigation signal, a process of detecting a radio link down between the plurality of radio base stations based on the detected delay of the navigation signal, and when the radio link down is detected, The process of adjusting the transmission output / error correction capability to the opposite station side is executed.

  That is, the radio access network of the present invention predicts a radio link down due to weather deterioration such as sudden rain in a point-to-point radio access network in advance, and avoids the radio link down. It is a feature.

  In the radio access network of the present invention, each radio base station constituting the network is equipped with a device that receives a navigation signal of a GPS (Global Positioning System) satellite and measures a fluctuation in the reception level. A function for each wireless base station to transmit and receive data between wireless base stations connected by wireless / wired, and a function to calculate the position of a GPS satellite by the interference method from the received GPS satellite navigation signal and its reception time difference, and have.

  By implementing these functions, in the radio access network of the present invention, each radio base station in the radio access network cooperates to automatically control the transmission output from the received GPS satellite navigation signal and its reception level, Solve the above problems.

  More specifically, in the radio access network of the present invention, a GPS navigation receiver is installed in a radio base station to detect whether a delay has occurred between the GPS satellite and the GPS navigation receiver.

  If there is a delay between the GPS satellite and the GPS navigation receiver, it is predicted that a water vapor lump or rain cloud has occurred in the sky, so the radio base station preliminarily It has a function of automatically adjusting the transmission output / error correction capability.

  Further, the radio access network of the present invention takes a wired and wireless network system between radio base stations, and by sharing a delay between a GPS satellite and a GPS navigation receiver in each radio base station, It is possible not only to adjust the transmission output level / error correction capability only between the local station and the radio opposite station, but also to dynamically grasp changes in the situation such as weather deterioration related to the entire network. The function of automatically adjusting the appropriate transmission output / error correction capability of Further, in a ring network, it is possible to avoid the radio link down by determining the radio link down between the radio opposite stations based on delay information shared in advance and changing the path.

  As described above, in the radio access network of the present invention, the weather condition is predicted by detecting the delay between the GPS satellite and the GPS navigation receiver, so the radio link due to a bad weather such as a sudden rain. Data can be reached by predicting down beforehand and avoiding the wireless link down.

  As a result, in the radio access network of the present invention, the weather condition is predicted by detecting the delay between the GPS satellite and the GPS navigation receiver. This can be avoided by automatically adjusting the transmission power / error correction capability in advance.

  Further, in the radio access network of the present invention, by sharing the delay information data between the GPS satellite and the GPS navigation receiver between the radio base stations, not only the radio link down between the radio stations but also the network It is possible to avoid a radio link down in the whole by predicting in advance.

  Furthermore, in the radio access network of the present invention, it is possible to change the route setting in advance in the ring configuration, and it is possible to avoid the failure of data arrival due to the radio link down in advance.

  The present invention is configured and operated as described below, so that it is possible to predict in advance radio link down due to weather deterioration such as sudden rain and to avoid the radio link down.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a radio access network according to an embodiment of the present invention. In FIG. 1, a radio access network according to an embodiment of the present invention forms a network by connecting radio base stations 1-1 to 1-30 to each other by radio or wire.

  Each of the wireless base stations 1-1 to 1-30 is configured as a point-to-point wireless access network and a wired access network. The wireless base stations 1-1 to 1-30 are configured to exchange data with each other by using a wired or wireless network.

  FIG. 2 is a block diagram showing the configuration of the radio base stations 1-1 to 1-30 in FIG. In FIG. 2, the radio base stations 1-1 to 1-30 are indicated as the radio base station 1, and the configuration of each of the radio base stations 1-1 to 1-30 is the same as the configuration of the radio base station 1. .

  The wireless base station 1 is connected to a GPS (Global Positioning System) navigation receiver 2 and an ODU (Out Door Unit) 3. The ODU 3 is used for communication with an opposite radio station (not shown), and the GPS navigation receiver 2 communicates with a GPS satellite (not shown).

  The radio base station 1 also includes a reception level detection unit 11, an ODU transmission output control unit 12, a navigation signal reception delay detection unit 13, a radio link down prediction unit 14, a prediction information reception unit 15, and a transmission power / error. The correction capability adjustment unit 16, the prediction information notification unit 17, and a recording medium 18 that stores a program (a computer-executable program) for realizing the operation of each unit described above.

  When the reception level detector 11 receives the navigation signal from the GPS navigation signal receiver 2, the reception level detector 11 detects the reception level and notifies the ODU transmission output controller 12 of the reception level. Further, when the reception level detection unit 11 receives the navigation signal from the GPS navigation signal reception device 2, the reception level detection unit 11 notifies the navigation signal reception delay detection unit 13 of the navigation signal.

  The ODU transmission output control unit 12 controls the transmission output of the ODU 3 based on the reception level from the reception level detection unit 11. The navigation signal reception delay detection unit 13 detects a delay in reception of the navigation signal from the reception level detection unit 11 and, when detecting the delay, notifies the radio link down prediction unit 14 of the delay.

  Here, when the GPS navigation signal receiving device 2 simultaneously receives radio waves emitted by three or more satellites in a group of six orbits having an altitude of about 20,000 km, it measures the position and altitude of the received points. The navigation signal reception delay detection unit 13 detects a delay in the reception of the navigation signal from the arrival time of the radio wave received by the GPS navigation signal receiver 2.

  If there is a lot of water vapor in the atmosphere from the GPS satellite to the reception point, it takes time to reach the radio waves. Therefore, since the approach of the water vapor block / rain cloud can be known based on the delay in the reception of the navigation signal detected by the navigation signal reception delay detection unit 13, it is possible to predict the radio link down due to the water vapor block / rain cloud. Become.

  The radio link down prediction unit 14 performs radio link down prediction based on the delay detection by the navigation signal reception delay detection unit 13, and transmits the radio link down prediction information to the transmission power / error correction capability adjustment unit 16 and the prediction information notification. To the unit 17. When the prediction information receiving unit 15 receives wireless link down prediction information from another wired or wireless base station, the prediction information receiving unit 15 notifies the transmission power / error correction capability adjustment unit 16 and the prediction information notification unit 17 of the prediction information.

  When receiving the radio link down prediction information from the radio link down prediction unit 14 or the prediction information reception unit 15, the transmission power / error correction capability adjustment unit 16 adjusts the transmission power / error correction capability of the ODU 3. When the prediction information notification unit 17 receives the wireless link down prediction information from the wireless link down prediction unit 14 or the prediction information reception unit 15, the prediction information notification unit 17 transmits the prediction information to another wireless base station by wire or wireless.

  FIG. 3 is a diagram showing the relationship between the opposing radio base station and the GPS satellite in one embodiment of the present invention. In FIG. 3, there are three GPS satellites A to F on a pair of opposed radio base stations 1-1 and 1-2.

  In addition, a mass of water vapor / rain clouds are moving between the GPS satellites A to F and the radio base stations 1-1 and 1-2 from the radio base station 1-2 side to the radio base station 1-1 side. (Moved from the dotted line portion to the solid line portion in FIG. 3). The radio base stations 1-1 and 1-2 communicate with the GPS satellites A to F and store delay data in the radio base stations 1-1 and 1-2.

  FIG. 4 is a flowchart showing the operation of the radio base station 1 of FIG. 2, and FIG. 5 is a diagram for explaining the specific operation of the radio access network according to one embodiment of the present invention. The operation of the radio access network according to one embodiment of the present invention will be specifically described with reference to FIGS. Note that the operation shown in FIG. 4 is realized by the radio base station 1 executing the program of the recording medium 18.

  FIG. 5 shows the configuration of the radio access network when viewed from above and the movement of water vapor clusters / rain clouds in the sky. In FIG. 5, a water vapor lump / rain cloud is generated on the right side of the radio base station 1-21 (shown by a dotted line), and is moving in the direction of the radio base station 1-20 (shown by a solid line).

  The GPS navigation signal receiver 2 connected to the radio base station 1 is mainly installed near the ODU 3 and notifies the radio base station 1 of the reception level of the navigation signal. The transmission output of ODU3 is controlled based on the reception level.

  In this case, in the radio base station 1, when the reception level detector 11 detects the reception level of the navigation signal from the GPS navigation signal receiver 2, it notifies the ODU transmission output controller 12 of the reception level (step S1 in FIG. 4). ). The ODU transmission output control unit 12 controls the transmission output of the ODU 3 based on the reception level (step S2 in FIG. 4).

  In FIG. 3, it is shown that the water vapor lump / rain cloud has moved in the direction of the radio base station 1-1 from the radio base station 1-2 (dotted line portion). In the initial situation, there is no water vapor lump or rain cloud (dotted line portion) between the GPS satellites A to C and the radio base station 1-2 in each of the radio base stations 1-1 and 1-2. There is no delay in reception.

  However, when the water vapor lump / rain cloud reaches the position after movement (solid line part), a water vapor lump / rain cloud is generated between the GPS satellites A to C and the radio base station 1-2, and the radio base station 1-2. In the GPS navigation signal receiving device 2-2 connected to, there is a delay in receiving the navigation signal.

  In addition, since there are water vapor clusters and rain clouds between the GPS satellites E to F and the radio base station 1-1, the GPS navigation signal receiver 2-1 connected to the radio base station 1-1 There is a delay in receiving the navigation signal.

  As a result, since the radio link down due to rain is predicted between the radio base stations 1-1 and 1-2, the transmission power / error correction capability in the ODUs 3-1 and 3-2 is automatically adjusted in advance, and the radio due to rain Prevent link down.

  Further, since the movement (vector) of the water vapor lump and rain cloud can be predicted according to the order in which the shift of the delay data occurs, the predicted data is transmitted to each of the radio base stations 1-1 to 1-30 by the network shown in FIG. By automatically sharing the information data, the transmission power / error correction capability is automatically adjusted not only between the opposing radio base stations 1-1 to 1-30 but also in the radio base stations 1-1 to 1-30 in the entire network. By doing so, a wireless link down can be prevented in advance.

  In this case, in the radio base station 1, when the navigation signal reception delay detection unit 13 detects a delay in reception of the navigation signal (step S3 in FIG. 4), the radio link down prediction unit 14 determines based on the generation order of the delay data shift. The radio link down due to rain is predicted (step S4 in FIG. 4), and the prediction information is notified to the transmission power / error correction capability adjustment unit 16 and the prediction information notification unit 17.

  Further, when the prediction information receiving unit 15 receives prediction information from another base station by wire or wireless (step S5 in FIG. 4), the prediction information is transmitted to the transmission power / error correction capability adjusting unit 16, the prediction information notifying unit 17, and the like. Notify

  When the prediction information notification unit 17 receives the prediction information of the radio link down from the radio link down prediction unit 14 or the prediction information reception unit 15, the prediction information is transmitted to another radio base station (adjacent radio base station) by wire or radio. Transmit (step S6 in FIG. 4).

  When the transmission power / error correction capability adjustment unit 16 receives the radio link down prediction information from the radio link down prediction unit 14 or the prediction information reception unit 15, the transmission power / error correction capability adjustment unit 16 adjusts the transmission power / error correction capability of the ODU 3 based on the prediction information. Is performed (step S7 in FIG. 4). The wireless value station 1 repeatedly executes the above processing until the processing is completed (step S8 in FIG. 4).

  In the network configuration shown in FIG. 5, a water vapor lump / rain cloud is generated above the right side of the radio base station 1-21 (indicated by a dotted line) and is moving in the direction of the radio base station 1-20 (indicated by a solid line). Show). In FIG. 5, a route when data communication is transmitted from the radio base station 1-1 to the radio base station 1-19 is “radio base station 1-1 → radio base station 1-2 → radio base station 1”. -3 → radio base station 1-4 → radio base station 1-11 → radio base station 1-25 → radio base station 1-26 → radio base station 1-24 → radio base station 1-23 → radio base station 1− It is assumed that the route 22 → wireless base station 1-21 → wireless base station 1-20 → wireless base station 1-19 ”is used.

  Information on the delay of the navigation signal from the GPS satellite is first generated in the radio base station 1-21, and thereafter, the delay of the navigation signal from the GPS satellite is generated in the radio base station 1-20. In this embodiment, by sharing this information throughout the network, between the radio base station 1-19 and the radio base station 1-20, and between the radio base station 1-21 and the radio base station 1-22, Since wireless link down is predicted, the wireless base station 1-1 → wireless base station 1-2 → wireless base station 1-3 → wireless base station 1-4 → wireless base station 1-11 that does not pass through this route in advance. → Radio base station 1-12 → Radio base station 1-13 → Radio base station 1-14 → Radio base station 1-15 → Radio base station 1-16 → Radio base station 1-17 → Radio base station 1-18 → By detouring to the route of the wireless base station 1-19 ", the wireless link down of the network can be avoided and the data can be reached.

  As described above, in this embodiment, the weather condition is predicted by detecting the delay of the navigation signal between the GPS satellites A to F and the GPS navigation receiver 2, so that the weather deteriorates such as sudden rain. By preliminarily predicting the radio link down due to the ODU3 and automatically adjusting the transmission power / error correction capability of the ODU3, the radio link down due to bad weather can be avoided.

  In the present embodiment, the radio base stations 1-1 to 1-30 share the navigation signal delay information data between the GPS satellites A to F and the GPS navigation receiver 2 so that each radio Not only the radio link down between the base stations 1-1 to 1-30 but also the radio link down in the entire network can be predicted in advance to avoid the radio link down.

  Furthermore, in this embodiment, when the network has a ring configuration, it is possible to change the route setting in advance according to the prediction of the radio link down, and the data can avoid the failure of data arrival due to the radio link down in advance. It becomes possible.

It is a block diagram which shows the structure of the radio | wireless access network by one Example of this invention. FIG. 2 is a block diagram showing a configuration of a radio base station in FIG. 1. It is a figure which shows the relationship between the radio base station and GPS satellite which oppose in one Example of this invention. 3 is a flowchart showing an operation of the radio base station of FIG. FIG. 5 is a diagram for explaining a specific operation of a radio access network according to an embodiment of the present invention.

Explanation of symbols

1,1-1 to 1-30 radio base station 2,2-1,2-2 GPS navigation receiver 3,3-1,3-2 ODU
11 Reception level detector
12 ODU transmission output control unit
13 Navigation signal reception delay detector
14 Radio link down prediction unit
15 Prediction information receiver
16 Transmission power / error correction capability adjustment unit
17 Prediction information notification part
18 Recording media
A to F GPS satellites

Claims (10)

A radio access network comprising a plurality of radio base stations each equipped with a GPS navigation receiver for receiving navigation signals of GPS (Global Positioning System) satellites and connected to at least one of wired and radio stations facing each other Because
Means for measuring fluctuations in the reception level of the navigation signal, means for detecting a delay of the navigation signal, and detecting a radio link down between the plurality of radio base stations based on the detected delay of the navigation signal And a means for adjusting transmission output / error correction capability to the opposite station when the radio link down is detected in each of the plurality of radio base stations.   Each of the plurality of radio base stations includes means for performing data transmission / reception between the radio base stations, and the plurality of radio base stations are notified by notifying the opposite station of the detection information of the radio link down by the data transmission / reception means. The radio access network according to claim 1, wherein each base station shares the detection information of the radio link down.   3. The radio access network according to claim 2, wherein in the ring network, the data transmission / reception route is changed by judging the radio link down between the opposite stations based on delay information of the navigation signal shared in advance. A radio base station that is equipped with a GPS navigation receiving device that receives navigation signals of GPS (Global Positioning System) satellites and that is connected to at least one of wired and wireless to an opposing station,
Means for measuring fluctuations in the reception level of the navigation signal, means for detecting a delay of the navigation signal, and detecting a radio link down between the plurality of radio base stations based on the detected delay of the navigation signal And a means for adjusting a transmission output / error correction capability to the opposite station when the radio link down is detected.   Including means for transmitting / receiving data to / from another station, and notifying the opposite station of the detection information of the radio link down by the means for performing data transmission / reception. 5. The radio base station according to claim 4, wherein the detection information is shared.   6. The radio base station according to claim 5, wherein, in a ring network, the data transmission / reception route is changed by judging a radio link down between the opposite stations based on delay information of the navigation signal shared in advance.   A radio access network comprising a plurality of radio base stations each equipped with a GPS navigation receiver for receiving navigation signals of GPS (Global Positioning System) satellites and connected to at least one of wired and radio stations facing each other A transmission output control method for performing transmission output control between the radio base stations in the step of measuring a variation in the reception level of the navigation signal on each of the plurality of radio base stations, and delaying the navigation signal Detecting a radio link down between the plurality of radio base stations based on the detected delay of the navigation signal, and detecting the radio link down when the radio link down is detected. Adjusting the transmission output / error correction capability, and a transmission output control method.   The radio link down detection information is shared by each of the plurality of radio base stations by notifying the opposite station of the radio link down detection information when data is transmitted / received between the radio base stations. The transmission output control method according to claim 7.   When the radio access network is a ring network, the data transmission / reception route is changed by judging a radio link down between the opposite stations based on delay information of the navigation signal shared in advance. 9. The transmission output control method according to 8. A radio access network comprising a plurality of radio base stations each equipped with a GPS navigation receiver for receiving navigation signals of GPS (Global Positioning System) satellites and connected to at least one of wired and radio stations facing each other A transmission output control method program for performing transmission output control between the radio base stations in the computer, processing to measure the fluctuation of the reception level of the navigation signal, processing to detect the delay of the navigation signal, Processing for detecting a radio link down between the plurality of radio base stations based on the detected delay of the navigation signal, and transmission output / error correction capability to the opposite station when the radio link down is detected A program for executing adjustment processing.

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