JP2019176289A - Radio communication device, radio communications system, and radio communication method - Google Patents

Abstract

To provide a radio communication device capable of switching a ratio transmission path on the basis of a delay/a time synchronization/a PDV characteristic.SOLUTION: A radio communication device comprises a delay/time synchronization/PDV information table 16 storing information on a delay characteristic, a time synchronization characteristic, and a PDV characteristic which can be acquired on the basis of radio environment information 1 containing a current baud rate and a type of a modulation system as counting means of counting the delay characteristic, the time synchronization characteristic, and the PDV characteristic in regards to a radio transmission path from the radio communication device on a rear step side. A packet transmission part 12 includes a function for dynamically switching the transmission path transmitting the packet in each packet received on the basis of the information on the delay characteristic, the time synchronization characteristic, and the PDV characteristic contained in the delay/time synchronization/PDV information packet, and a type of a service requested by the packet received from the device on a prior step when transmitting the delay/time synchronization/PDV information packet.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication device, a wireless communication system, and a wireless communication method, and more particularly, wireless that can stably provide low delay / high time synchronization / low PDV services while responding to changes in the wireless environment state of a wireless transmission path. The present invention relates to a communication device, a wireless communication system, and a wireless communication method.

  As a new 5G use case, autonomous driving, telemedicine, IoT, and the like are being studied, and a new service using low delay is expected. For this reason, a technique for realizing low delay is also required in the field of wireless communication. Furthermore, there is an increasing demand for users to improve the time synchronization characteristic / PDV (Packet Delay Variation) characteristic.

  However, in the current technology, transmission path switching based on delay / time synchronization / PDV characteristics cannot be performed. For this reason, when the state of the wireless transmission path deteriorates, the transmission path is switched by the throughput and the packet throughput can be increased, but the required delay / time synchronization / PDV characteristics are satisfied. There is a problem that it is impossible to provide a service that can be provided. Furthermore, since the delay / time synchronization / PDV characteristics cannot be monitored, there is a problem that even if a service stop occurs, the cause of the service stop remains unknown.

  FIG. 14 is an explanatory diagram showing a selection path of a wireless transmission path targeted by the present invention. As shown in FIG. 14, as a wireless transmission path of the wireless communication apparatus 20, a wireless transmission path 31 toward the wireless communication apparatus 21 that has a small delay and a wireless transmission toward the wireless communication apparatus 22 that has a small PDV characteristic. When the path 32 and the wireless transmission path 33 toward the wireless communication device 23 that has a good time synchronization characteristic exist, it is strongly required to realize the following technology. That is, in the case of a packet of a service (Low Latency Service) that is required to reduce transmission delay, a wireless transmission path 31 having a small delay is selected, and a service that is required to reduce PDV characteristics ( In the case of a Low PDV Service packet, the wireless transmission path 32 having a small PDV characteristic is selected, and in the case of a service (Real Time Service) packet that requires good time synchronization, the time It is required to dynamically select a wireless transmission path 33 with good synchronization.

  FIG. 15 is an explanatory diagram illustrating a mutual relationship regarding communication characteristics of the current wireless communication device. FIG. 15 shows the relationship among baud rate, delay, time synchronization, PDV, and throughput as general communication characteristics of the wireless communication apparatus. At present, when the baud rate is high, it is assumed that the delay is small, the time synchronization is good, the PDV is small, and the throughput is large. On the other hand, when the baud rate is low, the delay is large, the time synchronization is poor, the PDV is large, and the throughput is assumed to be small.

  That is, in the current wireless communication apparatus, it is assumed that the higher the baud rate, the better the delay / time synchronization / PDV characteristics and the higher the throughput. However, this relationship may not be established depending on the wireless communication environment. Furthermore, in the future, requirements for delay / time synchronization / PDV characteristics tend to be stricter, and even when throughput is high, delay / time synchronization / PDV characteristics may not meet the requirements, which is better. It is becoming a situation where a long delay / time synchronization / PDV characteristic is required.

  A specific example of the problem in the case where the wireless transmission path is determined based on only the throughput as in the case of the current wireless communication apparatus will be described with reference to FIGS. FIG. 16 is an explanatory diagram illustrating communication characteristics when the number of hops (HOPs) of the wireless relay apparatuses in the wireless transmission path is different.

  In the explanatory diagram of FIG. 16, the wireless communication device 20 includes a wireless communication device 24 that forms a first wireless transmission path 801 in which the number of hops (HOP) of the wireless communication device is as large as 3 HOP as a wireless signal transmission destination, It is possible to select any one of the wireless communication devices 25 that form the second wireless transmission path 802 in which the number of hops (HOP) of the communication device is as small as 2 HOP. Here, although the first wireless transmission path 801 has a higher baud rate and higher throughput than the second wireless transmission path 802, the number of HOPs of the wireless communication apparatus is large, so that the delay is large, the time synchronization is poor, and the PDV is Assume that the transmission path is large.

  As shown in FIG. 16, when the baud rate of the wireless communication apparatus forming the first wireless transmission path 801 is higher than the baud rate of the wireless communication apparatus forming the second wireless transmission path 802, the throughput is the wireless communication apparatus. Even if the number of HOPs increases, it is larger than the second wireless transmission path 802 without being affected. Therefore, when the wireless communication device 20 selects a wireless transmission path based on the throughput, the first wireless transmission path 801 is selected. However, the delay / time synchronization / PDV characteristics are greatly affected by the number of HOPs of the wireless communication device, and degrade as the number of HOPs increases. Therefore, as long as the selection based on the baud rate of the wireless communication device, that is, the throughput, the delay / time synchronization The second wireless transmission path 802 having better / PDV characteristics than the first wireless transmission path 801 cannot be selected.

  Next, problems different from those in FIG. 16 will be described with reference to the explanatory diagram of FIG. FIG. 17 is an explanatory diagram illustrating communication characteristics when an MRL (Multi Radio Link) technique of a wireless communication apparatus is applied to a wireless transmission path.

  In the explanatory diagram of FIG. 17, the wireless communication device 20 is a wireless signal transmission destination, and the wireless communication device 29 a, the wireless communication device 29 b, and the wireless communication, although the number of hops (HOP) of the wireless communication device is 2 HOP. The wireless communication device 26 that forms the third wireless transmission path 803 having the MRL configured wireless communication device composed of the device 29c and the wireless communication device 27 that forms the fourth wireless transmission path 804 that does not have the MRL configuration. It is possible to select. Here, although the baud rate of the third wireless transmission line 803 is lower than that of the fourth wireless transmission line 804, the MRL configuration of the wireless communication apparatus can increase the throughput, but has a large delay and time synchronization. Suppose that the transmission path is large and the PDV is large.

  That is, the third wireless transmission path 803 has a configuration to which the MRL technology using a plurality (three in the case of FIG. 17) of wireless communication devices is applied, and thus each wireless communication device 29a of the MRL configuration, the wireless communication This is the total throughput of the device 29b and the wireless communication device 29c. Therefore, even if the third wireless transmission path 803 is formed by a wireless communication apparatus having a lower baud rate than the wireless communication apparatus of the fourth wireless transmission path 804, the fourth wireless transmission path 803 has no MRL configuration. Throughput can be improved over the wireless transmission path 804. As a result, when the wireless communication apparatus 20 selects a wireless transmission path based on the throughput, the third wireless transmission path 803 is selected.

  However, the delay / time synchronization / PDV characteristics are greatly influenced by the MRL configuration of the radio communication apparatus, and the characteristics of the radio transmission path in which the MRL configuration is introduced are deteriorated. Therefore, selection based on the throughput of the radio transmission path is performed. As long as delay / time synchronization / PDV characteristics are better than the first wireless transmission path 801, the second wireless transmission path 802 cannot be selected.

  Further, in Japanese Patent Laid-Open No. 2017-139595 “Data transmission control system and method, and data transmission control program” of Patent Document 1, an error rate of a wireless transmission path is set using heartbeat packets transmitted at regular intervals. Proposes a technique to measure periodically and compare the measured error rate with a predetermined threshold to select the wireless transmission path with the least delay among multiple wireless transmission paths and switch in advance Yes. However, in Patent Document 1, a static transmission path switching technique based on a simple error state of a wireless transmission path, which is a dynamic transmission path that takes into account information such as delay variation and time synchronization of the wireless transmission path Since it is not a switching technique, it is not possible to select and switch a wireless transmission path with good delay / time synchronization / PDV characteristics.

JP 2017-139595 A

  As described above, in the wireless communication device using the current technology related to the present invention, the wireless communication apparatus transmits the throughput information of the wireless transmission path to the wireless communication device in the previous stage and receives the throughput information. The communication apparatus selects and switches the wireless transmission path based on the throughput information, or wirelessly based on a static error rate measured periodically as described in Patent Document 1. A technique of selecting and switching a transmission line has been adopted.

  Therefore, since the current technology does not include a means for measuring dynamic delay / time synchronization / PDV characteristics, even if the throughput and the static error rate are good, the delay / time synchronization / PDV characteristics. However, there is a problem to be solved that it is not possible to select and switch a good wireless transmission path.

(Purpose of this disclosure)
An object of the present disclosure is to provide a wireless communication device, a wireless communication system, and a wireless communication method capable of switching wireless transmission paths based on delay / time synchronization / PDV characteristics.

  In order to solve the above-described problems, the wireless communication device, the wireless communication system, and the wireless communication method according to the present invention mainly adopt the following characteristic configuration.

(1) A wireless communication apparatus according to the present invention includes:
A function for converting a packet received from the upstream device to wireless data and transmitting it to the downstream device via a wireless transmission path, and converting a wireless data received from the downstream device via the wireless transmission path to a packet And having a function of transmitting to the upstream device and a function of switching the wireless transmission path,
Measuring means for measuring delay characteristics, time synchronization characteristics, and PDV (Packet Delay Variation) characteristics related to the wireless transmission path to the wireless communication device on the rear stage side;
Packet delay means for generating information on the measured delay characteristics, time synchronization characteristics, and PDV characteristics as delay / time synchronization / PDV information packets, and transmitting the packets to the wireless communication device on the preceding stage,
The packet transmission means includes
When the generated delay / time synchronization / PDV information packet is to be transmitted to the wireless communication device on the upstream side, or the delay / time synchronization / PDV information packet transmitted from the wireless communication device on the downstream side is transmitted to the upstream side. Packet to be received from the preceding apparatus and the delay characteristics, the time synchronization characteristics, and the PDV characteristics information included in the delay / time synchronization / PDV information packet when transferring to the wireless communication apparatus on the side And a function of dynamically switching a transmission path for transmitting the packet for each packet to be received based on the type of service required.

(2) A wireless communication system according to the present invention includes:
A function for converting a packet received from the upstream device to wireless data and transmitting it to the downstream device via a wireless transmission path, and converting a wireless data received from the downstream device via the wireless transmission path to a packet And an NMS (Network Management System) device for managing the entire wireless communication network including one or more wireless communication devices having a function of transmitting to the upstream device and a function of switching the wireless transmission path,
The NMS device is
Delay including measurement results of delay characteristics, time synchronization characteristics, and PDV (Packet Delay Variation) characteristics related to the wireless transmission path from all the wireless communication apparatuses constituting the wireless communication network to the wireless communication apparatus on the subsequent stage side / Time synchronization / PDV information packet received,
Based on the delay characteristics, the time synchronization characteristics, and the PDV characteristics information included in each received delay / time synchronization / PDV information packet, it is determined whether or not to switch transmission paths, and transmission A transmission path switching information packet for instructing path switching is generated and transmitted to the corresponding wireless communication apparatus.

(3) A wireless communication method according to the present invention includes:
A function for converting a packet received from the upstream device to wireless data and transmitting it to the downstream device via a wireless transmission path, and converting a wireless data received from the downstream device via the wireless transmission path to a packet Then, wireless communication is performed by a wireless communication device having a function of transmitting to the upstream device and a function of switching the wireless transmission path,
A measurement step of measuring a delay characteristic, a time synchronization characteristic, and a PDV (Packet Delay Variation) characteristic related to the wireless transmission path with the wireless communication device on the subsequent stage side;
A packet transmission step of generating information on the measured delay characteristics, time synchronization characteristics, and PDV characteristics as a delay / time synchronization / PDV information packet and transmitting the information to a wireless communication device on a preceding stage;
The packet transmission step includes:
When the generated delay / time synchronization / PDV information packet is to be transmitted to the wireless communication device on the upstream side, or the delay / time synchronization / PDV information packet transmitted from the wireless communication device on the downstream side is transmitted to the upstream side. Packet to be received from the preceding apparatus and the delay characteristics, the time synchronization characteristics and the PDV characteristics information included in the delay / time synchronization / PDV information packet when transferring to the wireless communication apparatus on the side And a function of dynamically switching a transmission path for transmitting the packet for each packet to be received based on the type of service required.

  According to the wireless communication device, the wireless communication system, and the wireless communication method of the present invention, the following effects can be mainly achieved.

  That is, the transmission path of the packet is dynamically switched according to the type of service required for the packet to be transmitted and the measurement result of the delay characteristic, time synchronization characteristic, and PDV characteristic of the current wireless transmission path. Therefore, a low delay / high time synchronization / low PDV service can be stably provided while adapting to changes in the wireless environment state of the wireless transmission path.

It is a block block diagram which shows an example of the internal structure of the radio | wireless communication apparatus which concerns on this invention. 1 is a system configuration diagram illustrating an example of a system configuration of a wireless communication system according to the present invention. 3 is a table showing an example of a delay information table in the delay / time synchronization / PDV information table of the wireless communication apparatus shown in FIG. 1. 3 is a table showing an example of a time synchronization information table in the delay / time synchronization / PDV information table of the wireless communication apparatus shown in FIG. 1. 3 is a table showing an example of a PDV information table in the delay / time synchronization / PDV information table of the wireless communication apparatus shown in FIG. 1. FIG. 3 is a schematic diagram illustrating an example in which delay / time synchronization / PDV information multiplexing unit of the wireless communication apparatus illustrated in FIG. 1 multiplexes delay / time synchronization / PDV information into a packet for Ethernet. It is a block block diagram which shows the example different from FIG. 1 of the internal structure of the radio | wireless communication apparatus which concerns on this invention. It is a table which shows an example of a delay information table among the delay / time synchronization / PDV information tables of the radio | wireless communication apparatus shown in FIG. It is a block block diagram which shows the example different from FIG. 1, FIG. 7 of the internal structure of the radio | wireless communication apparatus which concerns on this invention. FIG. 3 is a system configuration diagram showing an example different from FIG. 2 of the system configuration of the wireless communication system according to the present invention. It is a block block diagram which shows an example of an internal structure of the radio | wireless communication apparatus in the radio | wireless communications system shown in FIG. It is a block block diagram which shows the example different from FIG.1, FIG.7, FIG.11 of the internal structure of the radio | wireless communication apparatus which concerns on this invention. It is a system configuration | structure figure which shows the example different from FIG. 10 of the system configuration | structure of the radio | wireless communications system which concerns on this invention. It is explanatory drawing which shows the selection path | route of the wireless transmission path which this invention aims at. It is explanatory drawing explaining the mutual relationship regarding the communication characteristic of the present radio | wireless communication apparatus. It is explanatory drawing explaining the communication characteristic in case the number of hops (HOP) of the radio relay apparatus in a radio transmission path differs. It is explanatory drawing explaining the communication characteristic at the time of applying the MRL technique of a radio | wireless communication apparatus to a radio transmission line.

  Preferred embodiments of a wireless communication device, a wireless communication system, and a wireless communication method according to the present invention will be described below with reference to the accompanying drawings. The wireless communication method according to the present invention may be implemented as a wireless communication program that can be executed by a computer, or the wireless communication program may be recorded on a computer-readable recording medium. Needless to say. In addition, it is needless to say that the drawing reference numerals attached to the following drawings are added for convenience to the respective elements as an example for facilitating understanding, and are not intended to limit the present invention to the illustrated embodiments. Yes.

<Features of the present invention>
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. According to the present invention, each wireless communication device includes measurement means for measuring delay characteristics / time synchronization characteristics / PDV (Packet Delay Variation) characteristics of a wireless transmission path, and information on the measured delay characteristics / time synchronization characteristics / PDV characteristics is provided. The main feature is that the data is transmitted to the preceding stage wireless communication apparatus or an NMS (Network Management System) apparatus that manages the wireless communication network. Another main feature is to construct a wireless communication system that dynamically switches wireless transmission paths based on delay characteristics / time synchronization characteristics / PDV characteristics received by the preceding stage wireless communication apparatus or NMS apparatus.

<Embodiment of the present invention>
Next, embodiments of a wireless communication device, a wireless communication system, and a wireless communication method according to the present invention will be described in detail with reference to the drawings.

(Configuration example of embodiment of the present invention)
First, an example of the internal configuration of the wireless communication apparatus according to the present invention will be described in detail with reference to FIG. FIG. 1 is a block diagram showing an example of the internal configuration of a wireless communication apparatus according to the present invention.

  A wireless communication device 10 illustrated in FIG. 1 includes an interface for packet communication and an interface for wireless communication, and includes a packet reception unit 11, a packet transmission unit 12, a wireless transmission circuit unit 13, a wireless reception circuit unit 14, and a wireless communication device. The antenna 15 includes a delay / time synchronization / PDV information table 16, a delay / time synchronization / PDV information multiplexing unit 17, and a delay / time synchronization / PDV information extraction unit 18. The packet receiving unit 11 and the packet transmitting unit 12 have a function of receiving and transmitting communication packets such as Ethernet packets. The wireless transmission circuit unit 13, the wireless reception circuit unit 14, and the wireless antenna 15 have a function of transmitting various information to the wireless transmission path and receiving various information from the wireless transmission path.

  The delay / time synchronization / PDV information table 16, the delay / time synchronization / PDV information multiplexing unit 17, and the delay / time synchronization / PDV information extraction unit 18 are circuit units unique to the present invention. The delay / time synchronization / PDV information table 16 is a table in which values relating to delay / time synchronization / PDV information, which are parameters unique to the wireless communication device, are set and registered in advance as fixed values for each wireless environment state of the wireless transmission path. It is. Then, in order to select and use the value of delay / time synchronization / PDV information depending on the wireless environment state of the current wireless transmission path, baud rate information and modulation scheme information output from the wireless transmission circuit unit 13 are used. The delay / time synchronization / PDV information table 16 is searched using the wireless environment information 1 consisting of Of the values related to the delay / time synchronization / PDV information set and registered in advance in the delay / time synchronization / PDV information table 16, any value corresponding to the wireless environment information 1 of the search key is selected. A means for measuring values related to delay / time synchronization / PDV information is realized. Then, a value related to the delay / time synchronization / PDV information measured (selected) by the measuring means is sent to the delay / time synchronization / PDV information multiplexing unit 17.

  Also, the delay / time synchronization / PDV information multiplexing unit 17 transmits a value related to the delay / time synchronization / PDV information sent from the delay / time synchronization / PDV information table 16 to the wireless communication apparatus in the previous stage. It has a function of multiplexing the packet and outputting it to the packet transmitter 12.

  Also, the delay / time synchronization / PDV information extraction unit 18 extracts information on the delay / time synchronization / PDV multiplexed in the packet transmitted from the subsequent wireless communication apparatus, and delay / time synchronization / PDV. The information 2 has a function of multiplexing the transmission packet to be transmitted to the wireless communication apparatus in the previous stage and outputting the multiplexed packet to the packet transmission unit 12.

  Next, an example of the system configuration of the wireless communication system according to the present invention will be described in detail with reference to FIG. FIG. 2 is a system configuration diagram showing an example of a system configuration of the radio communication system according to the present invention.

  The wireless communication system shown in FIG. 2 includes a first wireless communication device 101, a second wireless communication device 102, a third wireless communication device 103, a fourth wireless communication device 104, a fifth wireless communication device 105, and a sixth wireless communication device 106. The case where it is comprised from these six radio | wireless communication apparatuses is shown. Then, two wireless communication devices, the second wireless communication device 102 and the third wireless communication device 103, are wired to the subsequent stage of the first wireless communication device 101, and the fourth wireless communication device 106 is connected to the fourth wireless communication apparatus 106 in the subsequent stage. Two wireless communication devices, a wireless communication device 104 and a fifth wireless communication device 105, are connected by wire. The second wireless communication device 102 and the fourth wireless communication device 104 are wirelessly connected via the first wireless transmission path 201, and the third wireless communication device 103 and the fifth wireless communication device 105 are connected to the second wireless communication device. Wireless connection is established via the transmission path 202.

  In the system configuration illustrated in FIG. 2, the internal configurations of the first wireless communication device 101 to the sixth wireless communication device 106 are the same as those of the wireless communication device 1 illustrated in FIG. 1. The first wireless communication apparatus 101 is a wireless communication apparatus that switches the wireless transmission path on the rear stage side with respect to the transmission path to be used. The two wireless communication apparatuses on the rear stage side, that is, the second wireless communication apparatus 102 and the third wireless communication apparatus 101 An interface for performing packet communication with the wireless communication apparatus 103 is provided. An arrow line between the first wireless communication apparatus 101 and the two subsequent wireless communication apparatuses, that is, the second wireless communication apparatus 102 and the third wireless communication apparatus 103, indicates that packet communication is performed in both directions. .

  The sixth wireless communication device 106 is a wireless communication device that performs an operation in accordance with the switching of the wireless transmission path on the upstream side with respect to the transmission path to be used, and the two wireless communication devices on the upstream side, that is, the fourth wireless communication device. 104 and an interface for performing packet communication with the fifth wireless communication apparatus 105. An arrow line between the sixth wireless communication device 106 and the two subsequent wireless communication devices, that is, the fourth wireless communication device 104 and the fifth wireless communication device 105, indicates that packet communication is performed in both directions. .

  The second wireless communication device 102 has an interface for performing packet communication with the first wireless communication device 101 on the upstream side, and the first wireless transmission path with the fourth wireless communication device 104 on the downstream side. An interface for performing wireless communication via 201 is provided. Further, the second wireless communication apparatus 102 transmits information indicating the delay / time synchronization / PDV characteristic measurement result regarding the first wireless transmission path 201 to the first wireless communication apparatus 101 on the upstream side by packet communication. A broken-line arrow line from the second wireless communication apparatus 102 toward the first wireless communication apparatus 101 on the preceding stage indicates a first delay / time synchronization relating to the first wireless transmission path 201 transmitted to the first wireless communication apparatus 101 on the preceding stage. / PDV information packet 301 is shown.

  The third wireless communication device 103 has an interface for performing packet communication with the first wireless communication device 101 on the upstream side, and the second wireless transmission path with the fifth wireless communication device 105 on the downstream side. An interface for performing wireless communication via 202 is provided. Furthermore, the third wireless communication apparatus 103 transmits information indicating the delay / time synchronization / PDV characteristic measurement result regarding the second wireless transmission path 202 to the first wireless communication apparatus 101 on the upstream side by packet communication. A broken-line arrow line from the third wireless communication apparatus 103 toward the first wireless communication apparatus 101 on the preceding stage indicates a second delay / time synchronization regarding the second wireless transmission path 202 transmitted to the first wireless communication apparatus 101 on the preceding stage. The / PDV information packet 302 is shown.

  The fourth wireless communication apparatus 104 has an interface for performing wireless communication with the second wireless communication apparatus 102 on the front stage side via the first wireless transmission path 201, and the sixth wireless communication apparatus 106 on the rear stage side. An interface for performing packet communication with each other. Note that the fourth wireless communication device 104 packets information indicating the measurement result of the delay / time synchronization / PDV characteristics related to the first wireless transmission path 201 to the sixth wireless communication device 106 on the subsequent stage as necessary. It is also possible to transmit by communication.

  The fifth wireless communication apparatus 105 has an interface for performing wireless communication with the third wireless communication apparatus 103 on the front stage side via the second wireless transmission path 202, and the sixth wireless communication apparatus 106 on the rear stage side. An interface for performing packet communication with each other. Note that the fifth wireless communication apparatus 105 packets information indicating the measurement result of the delay / time synchronization / PDV characteristics related to the second wireless transmission path 201 to the sixth wireless communication apparatus 106 on the rear stage as necessary. It is also possible to transmit by communication.

(Description of the operation of the embodiment of the present invention)
Next, an example of the operation of the wireless communication apparatus 10 shown in FIG. 1 as an embodiment of the present invention will be described in detail. First, the packet receiving unit 11 receives a packet from a device on the front stage side or the rear stage side via the packet interface and sends the packet to the wireless transmission circuit unit 13. However, when receiving a delay / time synchronization / PDV information packet related to a wireless transmission path to be described later, the packet receiving unit 11 delays the received delay / time synchronization / PDV information packet. / Time synchronization / PDV information extraction unit 17 That is, the received delay / time synchronization / PDV information packet is not sent to the wireless transmission circuit unit 13. The packet receiving unit 11 includes one or more packet interfaces (ports).

  Further, the wireless transmission circuit unit 13 converts the received packet into wireless data, and transmits the wireless data to the wireless transmission path via the wireless antenna 15. The radio reception circuit unit 14 converts radio data received from the radio transmission path via the radio antenna 15 into a packet and sends the packet to the packet transmission unit 12. The wireless transmission circuit unit 13 and the wireless reception circuit unit 14 support a plurality of baud rates and an AMR function (Adaptive Multi-Rate Modulation).

  The packet transmission unit 12 receives packets sent from the wireless reception circuit unit 14 and a delay / time synchronization / PDV information multiplexing unit 17 described later, performs arbitration of the packets, It transmits to the latter stage device. The packet transmission unit 12 includes one or more packet interfaces (ports). Then, the packet transmission unit 12 performs transmission distribution regarding the packet interface (port) that is the transmission destination of the packet based on the delay / time synchronization / PDV information 2 sent from the delay / time synchronization / PDV information extraction unit 17. Do.

  The delay / time synchronization / PDV information table 16 sets and registers each of delay information, time synchronization information, and PDV information, which are parameters unique to the wireless communication device, as fixed values. Delay / time synchronization / PDV information (each of delay information, time synchronization information, and PDV information) is wirelessly transmitted to a radio transmission path toward the opposite radio communication apparatus 10 after the packet is input to the radio communication apparatus 10. Thereafter, the value until the packet is output from the opposite wireless communication apparatus is registered as a value unique to the wireless communication apparatus.

  Next, delay / time synchronization / PDV information (each of delay information, time synchronization information, and PDV information) will be described in detail.

  First, the delay information will be described. The delay information means a delay amount when a packet passes from the wireless communication device 10 to the opposite wireless communication device 10. The value of the delay information is a value including a processing time in the packet receiving unit 11 and the packet transmitting unit 12, a baud rate in the wireless transmitting circuit unit 13 and the wireless receiving circuit unit 14, and a wireless data transfer time by a modulation method. Generally, the value is on the order of μs or ms.

  Next, time synchronization information will be described. The time synchronization information means a clock synchronization shift amount between the wireless communication devices 10 facing each other via the wireless transmission path. The value of the time synchronization information is a fluctuation value due to clock change between the operation clock of the packet reception unit 11 and the packet transmission unit 12 and the operation clock of the wireless transmission circuit unit 13 and the wireless reception circuit unit 14. Generally, it is a value of ns order.

  Next, PDV information will be described. The PDV information means a value of packet delay variation. In general, the wireless transmission circuit unit 13 and the wireless reception circuit unit 14 perform wireless communication using a wireless frame. The radio frame includes an overhead area for radio synchronization, and actual data cannot be multiplexed in the overhead area. Here, the wireless transmission timing of the packet and the timing of the overhead area of the wireless frame are asynchronous. Therefore, the difference between the time when the packet was wirelessly transmitted without overlapping the overhead area and the time when the packet was wirelessly transmitted due to the overlap with the overhead area and then the time when the packet was wirelessly transmitted is the value of the PDV information. Become. Generally, it is a value of ns order.

  As an example of the delay / time synchronization / PDV information table 16, examples of tables in which delay information, time synchronization information, and PDV information are set and registered are shown in FIGS. That is, FIG. 3 is a table showing an example of the delay information table in the delay / time synchronization / PDV information table 16 of the wireless communication apparatus 10 shown in FIG. FIG. 4 is a table showing an example of the time synchronization information table in the delay / time synchronization / PDV information table 16 of the wireless communication apparatus 10 shown in FIG. FIG. 5 is a table showing an example of the PDV information table in the delay / time synchronization / PDV information table 16 of the wireless communication apparatus 10 shown in FIG.

  In addition, the setting registration example of each table of FIG. 3, FIG. 4, FIG. A case where the number is limited to 14 is shown as an example. That is, in each table of FIG. 3, FIG. 4, and FIG. 5, as shown in FIG. It shows a case where values of delay information, time synchronization information, and PDV information are selected according to the output wireless environment information 1 (baud rate, modulation method information).

  For example, when the baud rate is 14 MHz and the modulation method is 32QAM as the wireless environment information 1 sent from the wireless transmission circuit unit 13, the delay information table shows the delay information as shown in FIG. 4000 μs is selected as the value of the time, ± 30 ns is selected as the value of the time synchronization information from the time synchronization information table as shown in FIG. 4, and as shown in FIG. 5 from the PDV information table. ± 40 ns is selected as the value of the PDV information and is sent to the delay / time synchronization / PDV information multiplexing unit 17.

  Next, the delay / time synchronization / PDV information multiplexing unit 17 receives the delay / time synchronization / PDV information (delay information, time synchronization information, and PDV information) sent from the delay / time synchronization / PDV information table 16. Is packetized and sent to the packet transmitter 12. For example, in the case of a packet for Ethernet (registered trademark), the delay / time synchronization / PDV information is multiplexed and packetized in a payload section shown in FIG. FIG. 6 is a schematic diagram illustrating an example in which the delay / time synchronization / PDV information multiplexing unit 17 of the wireless communication apparatus 10 illustrated in FIG. 1 multiplexes delay / time synchronization / PDV information into a packet for Ethernet. As shown in FIG. 6, a packet for Ethernet is composed of a DA unit 3, an SA unit 4, a type unit 5, a payload unit 6, and an FCS unit 7. Delay / time synchronization / PDV information is multiplexed in the payload section 6. For the SA unit 4, the MAC address unique to the wireless communication device 10 is multiplexed.

  The delay / time synchronization / PDV information extraction unit 18 also includes delay / time synchronization / PDV information (delay information, time synchronization information included in the delay / time synchronization / PDV information packet sent from the packet reception unit 11. , Each piece of PDV information) is extracted and sent to the packet transmitter 12.

  As described above, the wireless communication apparatus 10 illustrated in FIG. 1 can perform transmission / reception of delay / time synchronization / PDV information, and can transmit and receive packets based on the delay / time synchronization / PDV information. Packet interface can be distributed.

  Next, an example of the operation of the wireless communication system shown in FIG. 2 will be described in detail by taking the case of performing data transmission from the first wireless communication apparatus 101 toward the sixth wireless communication apparatus 106 as an example. .

  First, in the packet reception unit 11, the first wireless communication apparatus 101 includes a first delay / time synchronization / PDV information packet 301 from the second wireless communication apparatus 102 on the rear stage side and a second delay from the third wireless communication apparatus 103. / Time synchronization / PDV information packet 302 is received. Then, in the delay / time synchronization / PDV information extraction unit 18, the first wireless communication apparatus 101 uses the received first delay / time synchronization / PDV information packet 301 and second delay / time synchronization / PDV information packet 302. Each delay / time synchronization / PDV information (that is, first delay / time synchronization / PDV information indicating the wireless environment on the first wireless transmission path 201 side and second delay / time indicating the wireless environment on the second wireless transmission path 202 side) Sync / PDV information) is extracted.

  Thereafter, the first wireless communication apparatus 101, in the packet transmission unit 12, the respective delay / time synchronization / PDV information extracted by the delay / time synchronization / PDV information extraction unit 17 (that is, the first delay / time synchronization / PDV information). And the second delay / time synchronization / PDV information), the transmission distribution for the packet interface that is the transmission destination of the packet is performed.

  For example, as described with reference to FIG. 14, in the case of a packet of a service (Low Latency Service) that is required to reduce transmission delay, each delay / time synchronization / PDV information (that is, first delay / time synchronization) / PDV information and second delay / time synchronization / PDV information), the delay information values are compared, and the wireless communication device on the rear stage toward the wireless transmission path with the smaller delay information value is selected. Then, the packet interface that is the transmission destination of the transmission packet is distributed.

  In the case of a service (Real Time Service) packet that requires good time synchronization, the same distribution is also applied to each of a service (Low PDV Service) packet that requires a reduction in PDV characteristics. Processing can be performed. Similarly, in the case of a packet of a service (High Performance Service) that requires high throughput and baud rate as in the current technology, it is also possible to select and distribute a transmission path in the same way. Needless to say.

  Further, as a measurement result of the delay characteristic / time synchronization characteristic / PDV characteristic in the second radio communication apparatus 102 or the third radio communication apparatus 103 on the rear stage side, whether or not any characteristic falls within a predetermined threshold as an allowable range. If there is a characteristic that does not fit, it is possible to send an alarm that identifies the characteristic that has deteriorated beyond the allowable range and stop using the corresponding wireless transmission path. It is.

  In addition, when the radio environment of the radio transmission circuit unit 13 in the second radio communication device 102 or the third radio communication device 103 on the rear stage side, that is, the baud rate or the modulation method is changed, the first radio communication device 101 is again connected. , The delay / time synchronization / PDV information packet is transmitted / received, and the delay / time synchronization / PDV information of the first wireless communication apparatus 101 is updated. As a result, in wireless communication from the first wireless communication apparatus 101 to the sixth wireless communication apparatus 106, transmission operation can be performed by switching to a wireless transmission path that provides optimum delay / time synchronization / PDV for each packet.

(Description of the effect of the embodiment of the present invention)
As described in detail above, the following effects are obtained in the present embodiment.

  That is, in the present embodiment, the function of converting the packet received from the upstream device into wireless data and transmitting it to the downstream device via the wireless transmission path and the downstream device via the wireless transmission path. As the wireless communication device 10 having at least a function of converting received wireless data into a packet and transmitting the packet to a device on the upstream side and a function of switching the wireless transmission path, the wireless communication with the wireless communication device on the downstream side Measuring means for measuring delay characteristics, time synchronization characteristics, and PDV (Packet Delay Variation) characteristics related to the transmission line, and information on the measured delay characteristics, time synchronization characteristics, and PDV characteristics are obtained as a delay / time synchronization / PDV information packet. And a packet transmission unit 12 that is a packet transmission unit that generates and transmits to the wireless communication device on the front stage side.

  Then, the packet transmission unit 12 transmits the generated delay / time synchronization / PDV information packet to the wireless communication device on the upstream side, or the delay / time transmitted from the wireless communication device on the downstream side. When the time synchronization / PDV information packet is to be transferred to the wireless communication apparatus on the preceding stage, the delay characteristic, the time synchronization characteristic, and the PDV characteristic information included in the delay / time synchronization / PDV information packet It has a function of dynamically switching a transmission path for transmitting the packet for each received packet based on the type of service required for the packet received from the upstream device.

  Here, as the measurement means, the delay that can be searched and acquired based on wireless environment information including at least a current baud rate and a modulation scheme type when transmitting wireless data to the wireless transmission path There is provided a delay / time synchronization / PDV information table 16 that stores information on characteristics, time synchronization characteristics, and PDV characteristics as predetermined fixed values or dynamically set values.

  Furthermore, one or more of the delay characteristic, the time synchronization characteristic, and the PDV characteristic value included in the delay / time synchronization / PDV information packet to be transmitted by the packet transmission unit 12 is set as an allowable range. When a predetermined threshold value is exceeded, the packet transmission unit 12 is configured to multiplex and transmit alarm information indicating that to the delay / time synchronization / PDV information packet.

  Thus, in the present embodiment, dynamically according to the type of service required for the packet to be transmitted and the measurement results of the delay characteristics, time synchronization characteristics, and PDV characteristics of the current wireless transmission path, Since packet transmission paths can be switched, low delay / high time synchronization / low PDV services can be stably provided while responding to changes in the wireless environment state of the wireless transmission path.

  In addition, when a deterioration of any one of the delay characteristics, time synchronization characteristics, and PDV characteristics of the current wireless transmission path is detected, an alarm specifying the deteriorated characteristics can be transmitted, so that the service is stopped. The cause can be easily identified.

<Other Embodiments of the Present Invention>
Next, regarding the wireless communication apparatus according to the present invention, another embodiment different from the above-described embodiment will be described.

(First other embodiment of the present invention)
First, a case where a packet received by the wireless communication apparatus according to the present invention is further subjected to various processing and transmitted will be described with reference to the block diagram of FIG. FIG. 7 is a block configuration diagram showing an example different from FIG. 1 of the internal configuration of the wireless communication apparatus according to the present invention, as the first other embodiment of the present invention.

  The radio communication device 10A shown in FIG. 7 further adds a reception packet processing function unit 11A and a transmission packet processing function unit 12A to the radio communication device 10 of FIG. 1, and delay / time synchronization in FIG. The / PDV information table 16 is replaced with a delay / time synchronization / PDV information table 16A. Since the other components of the wireless communication device 10A are the same as the components of the wireless communication device 10 in FIG. 1, the following overlapping description is omitted.

  The received packet processing function unit 11A of the wireless communication device 10A in FIG. 7 compresses / decompresses and encrypts a packet received by the packet receiving unit 11 when the packet processing function is set to the ON state (valid state). It has a function of performing various processes such as decoding / decoding and MRL (Multi Radio Link) and sending the result to the wireless transmission circuit unit 13. Similarly, when the packet processing function is set to the ON state (effective state), the transmission packet processing function unit 12A receives the packetized wireless data received by the wireless reception circuit unit 14 and sends it. The received packet is subjected to various processing such as compression / decompression and encryption / decryption, and is sent to the packet transmission unit 12.

  Here, the delay characteristics / time synchronization characteristics / PDV characteristics unique to the wireless communication device 10A depending on whether or not various processes are performed on the packets received by the reception packet processing function unit 11A and the transmission packet processing function unit 12A. Will fluctuate. Therefore, the received packet processing function unit 11A sets the ON / OFF (valid / invalid) state of the packet processing function in the received packet processing function unit 11A as the packet processing function ON / OFF information 1A, and delay / time synchronization / PDV information. It is sent to the table 16A.

  The delay / time synchronization / PDV information table 16A has a unique delay / time synchronization / PDV information value in accordance with the validity / invalidity of the packet processing function in addition to the wireless environment state of the wireless transmission path. It is set and registered in advance as a fixed value in the wireless communication device 10A. Therefore, the delay / time synchronization / PDV information table 16A includes the packet processing function ON / OFF information 1A sent from the received packet processing function unit 11A as the presence / absence state of the current packet processing function, and the current state from the wireless transmission circuit unit 13. The wireless environment information 1 (baud rate, modulation method information) sent as the wireless environment state of the wireless transmission path is searched as a search key, and the corresponding delay / time synchronization / PDV information value is selected and extracted. It is configured as follows.

  As an example of the delay / time synchronization / PDV information table 16A, FIG. 8 shows an example of a table in which delay information is set and registered among delay information, time synchronization information, and PDV information. That is, FIG. 8 is a table showing an example of the delay information table in the delay / time synchronization / PDV information table 16A of the wireless communication apparatus 10A shown in FIG.

  The delay information table shown in FIG. 8 is different from the table shown in FIG. 3 as the delay information table in the wireless communication apparatus 10 shown in FIG. 1, and further includes packets in addition to the wireless environment state (baud rate and modulation method) of the wireless transmission path. The value of delay information unique to the wireless communication device 10A is set and registered in advance in consideration of information on whether the processing function is valid / invalid (ON / OFF). Therefore, the wireless environment information 1 (information indicating the wireless environment state of the current wireless transmission path) sent from the wireless transmission circuit unit 13 and the packet processing function ON / OFF information 1A sent from the received packet processing function unit 11A The value of the corresponding delay information can be extracted in accordance with (information indicating whether or not the current packet processing function is present in the wireless communication device 10A).

  For example, as the wireless environment information 1 sent from the wireless transmission circuit unit 13, the baud rate is 14 MHz, the modulation method is 32QAM, and the packet processing function ON / OFF sent from the received packet processing function unit 11A When the information 1A is ON, 4500 μs is selected as the delay information value from the delay information table shown in FIG. 8 and is sent to the delay / time synchronization / PDV information multiplexing unit 17.

  Further, in the delay / time synchronization / PDV information table 16A, the time synchronization information table and the PDV information table other than the delay information table are not shown, but each of the time synchronization information table and the PDV information table is also the delay information of FIG. Similar to the table, in addition to the wireless environment state (baud rate, modulation method) of the wireless transmission path, the time unique to the wireless communication device 10A is also considered in consideration of the validity / invalidity (ON / OFF) information of the packet processing function. The synchronization information and PDV information values are set and registered in advance.

  The delay / time synchronization / PDV information table 16A may be further provided with a delay / time synchronization / PDV information table for each type of wireless communication device on the opposite side that is wirelessly opposed. For example, a wireless communication device having a different architecture from the wireless communication device 10A (that is, a wireless communication device having a different type of error correction code, packet interface speed, etc. in a wireless transmission circuit unit and a wireless reception circuit unit in the wireless communication device) and a wireless communication device. When facing each other, the delay characteristic / time synchronization characteristic / PDV characteristic in the radio communication apparatus of the radio facing destination is different from that of the own radio communication apparatus 10A.

  Therefore, in consideration of such a case, a delay / time synchronization / PDV information table is installed for each type of the wireless communication device on the other side facing the wireless communication, and according to the type of the wireless communication device on the other side actually facing the wireless communication. Any one of delay / time synchronization / PDV information table may be selected. In addition, since there are various known techniques in the current technology regarding the method of acquiring information related to the wireless communication device that is the wireless counterpart, detailed description thereof is omitted here.

  Further, the wireless environment information 1 (information indicating the current wireless environment state of the wireless transmission path) sent from the wireless transmission circuit unit 13 and the packet processing function ON / OFF information 1A sent from the received packet processing function unit 11A Depending on (the information indicating the presence / absence of the current packet processing function in the wireless communication device 10A), it may be possible to uniquely obtain the corresponding delay / time synchronization / PDV information by calculation. In such a case, fixed values of delay / time synchronization / PDV information are not necessarily stored in advance as a table, such as the delay / time synchronization / PDV information table 16A and the delay / time synchronization / PDV information table 16 described above as the previous embodiment. There is no need to register the setting, and the calculation may be performed by a combination of function settings.

(Second other embodiment of the present invention)
Next, the case where the delay characteristic is measured from the packet received in the wireless communication apparatus according to the present invention and reflected in the delay information table will be described with reference to the block diagram of FIG. FIG. 9 is a block configuration diagram showing an example different from FIGS. 1 and 7 of the internal configuration of the wireless communication apparatus according to the present invention, as the second other embodiment of the present invention.

  The radio communication device 10B shown in FIG. 9 has a configuration in which a time synchronization message transmission unit 11B and a time synchronization message reception unit 12B are further added to the radio communication device 10 of FIG. Since the other components of the wireless communication device 10B are the same as the components of the wireless communication device 10 in FIG. 1, the following overlapping description is omitted. FIG. 9 shows a configuration example in which additions / changes are made to the wireless communication apparatus 10 of FIG. 1, but the configuration is such that additions / changes are made to the wireless communication apparatus 10 of FIG. It doesn't matter.

  The time synchronization message transmission unit 11B has a function of setting the current time information in a packet transmitted from the wireless transmission circuit unit 13 to the wireless communication device on the opposite side as wireless data. In addition, the time synchronization message receiving unit 12B is set in the packet when the wireless reception circuit unit 14 sends a packet obtained by converting the wireless data transmitted from the wireless communication device on the opposite side of the wireless communication. It has a function of taking out the current time information and calculating the difference from the current time as delay information. The time synchronization message receiving unit 12B has a function of sending the calculated delay information to the delay / time synchronization / PDV information table 16 as measurement delay information 1B and reflecting it in the delay information table.

  The radio communication apparatus 10B shown in FIG. 9 measures the value of delay information in the installation environment actually installed by the time synchronization message transmission unit 11B and the time synchronization message reception unit 12B, and reflects them in the delay information table. Since the cable length between the wireless transmission circuit unit 13 / wireless reception circuit unit 14 of the own wireless communication device 10B and the wireless antenna 15 is different for each installed wireless communication device 10B. Even if it exists, it becomes possible to provide the delay / time synchronization / PDV information table 16 in which correct delay information values are registered.

  That is, since the time synchronization message transmitting unit 11B and the time synchronization message receiving unit 12B measure delay characteristics including the cable length connecting the wireless communication device and the wireless antenna, the configuration of the wireless communication device 10B is installed. It can be said that the configuration is particularly effective when the cable length connecting the wireless communication device and the wireless antenna is not fixed for each of the wireless communication devices 10B. As for the delay characteristic measuring method itself, for example, the current technology disclosed in International Publication No. 2015/125439 may be applied.

(Third other embodiment of the present invention)
Next, a system configuration example different from the configuration shown in FIG. 2 of the previous embodiment of the wireless communication system according to the present invention will be described with reference to the system configuration diagram of FIG. FIG. 10 is a system configuration diagram showing an example different from FIG. 2 of the system configuration of the wireless communication system according to the present invention as a third other embodiment of the present invention. Unlike the wireless communication system of FIG. 2, the wireless communication system of FIG. 10 is configured to include an NMS (Network Management System) as a device that manages the entire wireless communication network and switches transmission paths. Yes. Note that the network configuration between the first wireless communication device 101 to the sixth wireless communication device 106 in the wireless communication system of FIG. 10 is the same as the network configuration shown in FIG. The first wireless transmission path 201 set between the second wireless communication apparatus 102 and the fourth wireless communication apparatus 104, and the second wireless set between the third wireless communication apparatus 103 and the fifth wireless communication apparatus 105. The case where the transmission line 202 exists is shown.

  In the wireless communication system shown in FIG. 10, the NMS 110 (network management device) includes all the wireless communication devices constituting the wireless communication network (in the case of the example shown in FIG. 10, the first wireless communication device 101 to the eighth wireless communication). The delay / time synchronization / PDV information packets of the eight wireless communication devices of the device 108 are collected. Then, the NMS 110 is selected according to the delay / time synchronization / PDV information included in the delay / time synchronization / PDV information packet collected from each wireless communication device (that is, selected according to the current wireless environment of each wireless communication device). Based on the delay / time synchronization / PDV characteristic value), the packet transfer path is selected according to the service required for each packet transmitted / received between the first service 121 and the second service 122 of the communication service request source. Then, a transmission path switching information packet is generated and transmitted to the wireless communication apparatus determined as the transmission path switching target.

  For example, when the transmission path switching between the first wireless transmission path 201 and the second wireless transmission path 202 illustrated in FIG. 10 is performed, the NMS 110 transmits the first wireless communication apparatus 101 via the seventh wireless communication apparatus 107. In response, the generated transmission path switching information packet 303 is transmitted. When the first wireless communication apparatus 101 receives the transmission path switching information packet 303 from the NMS 110, the first wireless communication apparatus 101 and the first wireless transmission path 201 and the second wireless transmission path 201, based on the transmission path switching information specified by the transmission path switching information packet 303. The transmission path is switched with the wireless transmission path 202.

  The internal configuration of the wireless communication apparatus in the wireless communication system shown in FIG. 10 will be described with reference to FIG. FIG. 11 is a block configuration diagram showing an example of the internal configuration of a wireless communication device in the wireless communication system shown in FIG. 10 as another third embodiment of the present invention. A wireless communication device 10C illustrated in FIG. 11 is different from the packet reception unit 11C and the packet transmission unit 12C in the wireless communication device 10 illustrated in FIG. The delay / time synchronization / PDV information extraction unit 17 of the wireless communication apparatus 10 shown in FIG. Other components are the same as those of the wireless communication device 10 shown in FIG.

  First, in the case of the wireless communication device 10C shown in FIG. 11, the delay / time synchronization / PDV information packet received by the packet receiving unit 11C may be transferred as it is to the NMS 110. The delay / time synchronization / PDV information extraction unit 17 having a function of extracting a packet is unnecessary. That is, it is not necessary to determine whether or not the delay / time synchronization / PDV information packet received by the packet receiver 11C is a delay / time synchronization / PDV information packet. What is necessary is just to transmit to the part 13. Further, unlike the case of the wireless communication device 10 shown in FIG. 1, the packet receiving unit 11C receives the transmission path switching information packet 303 transmitted from the NMS 110 and transfers it to another wireless communication device. Also, it has a function of transmitting to the wireless transmission circuit unit 13 as it is.

  Unlike the case of the wireless communication apparatus 10 shown in FIG. 1, the packet transmission unit 12C determines whether or not the packet sent from the wireless reception circuit unit 14 is the transmission path switching information packet 303 from the NMS 110. In the case of the transmission path switching information packet 303, the transmission path switching information packet 303 has a function of identifying whether or not the destination of the transmission path switching information packet 303 is the own wireless communication device. Then, when the destination of the transmission path switching information packet 303 is not the own wireless communication apparatus but the destination is another wireless communication apparatus, the packet transmission unit 12C transmits the transmission path switching information packet 303 to the previous stage. Alternatively, the transmission path is transmitted to the radio communication apparatus in the subsequent stage. On the other hand, if it is the own radio communication apparatus, the transmission path switching information packet 303 is taken in and the transmission path specified in the transmission path switching information packet 303 is transmitted. It also has a function of performing a transmission path switching operation based on the switching information.

  Since the wireless communication device 10C shown in FIG. 11 has a configuration in which the delay / time synchronization / PDV information extraction unit 17 is deleted as described above, the packet transmission unit 12C has the wireless communication shown in FIG. Unlike the case of the apparatus 10, the function of receiving the delay / time synchronization / PDV information 2 from the delay / time synchronization / PDV information extraction unit 17 is unnecessary.

  By using the wireless communication device 10C having the internal configuration as shown in FIG. 11, the NMS 110 can control each wireless communication device constituting the wireless communication network, from the first service 121 to the second service 122 that is the communication service request source. As the transmission line between the two, the optimum transmission line switching required for each packet to be transmitted / received can be performed.

(Fourth other embodiment of the present invention)
Next, in the wireless communication apparatus and the wireless communication system according to the present invention, the delay / time synchronization / PDV characteristic value selected according to the current wireless environment is set as a predetermined threshold or dynamically set as an allowable range. A description will be given of a case where an alarm indicating the fact is issued when it is detected that the threshold value is exceeded. First, the case where the wireless communication apparatus detects an alarm state exceeding the threshold will be described with reference to FIG.

  FIG. 12 is a block configuration diagram showing an example of the internal configuration of the wireless communication apparatus according to the present invention, which is different from those shown in FIGS. 1, 7, and 11, as a fourth other embodiment of the present invention. 12 is different from the delay / time synchronization / PDV information multiplexing unit 17 of the wireless communication device 10 shown in FIG. 1 in the delay / time synchronization / PDV information multiplexing unit 17D. Each component is exactly the same as the wireless communication apparatus 10 shown in FIG.

  The radio communication apparatus 10D shown in FIG. 12 sets and registers a predetermined threshold value or a dynamically set threshold value in the delay / time synchronization / PDV information multiplexing unit 17D with respect to the delay / time synchronization / PDV characteristic value. ing. Then, the delay / time synchronization / PDV information multiplexing unit 17D selects the delay / time synchronization / PDV information sent from the delay / time synchronization / PDV information table 16 selected by the wireless environment information 1 indicating the current wireless environment state. Each of these values has a function of confirming whether it falls within the threshold value that is set and registered as an allowable range in the delay / time synchronization / PDV information multiplexing unit 17D.

  The delay / time synchronization / PDV information multiplexing unit 17D then sends the delay sent from the delay / time synchronization / PDV information table 16 as the value of the delay / time synchronization / PDV characteristic selected according to the current wireless environment. If any one or more of the specific / time synchronization specific / PDV specific values exceeds the threshold, the threshold excess alarm information indicating that fact and the information regarding the characteristics exceeding the delay / It has a function of multiplexing the time synchronization / PDV information packet and transmitting it to the packet transmitter 12.

  Next, a case where an alarm state exceeding the threshold is detected in an NMS (network management apparatus) that manages the entire wireless communication network as a wireless communication system will be described with reference to FIG.

  FIG. 13: is a system block diagram which shows the example different from FIG. 10 in 3rd other embodiment of the system configuration | structure of the radio | wireless communications system based on this invention as 4th other embodiment of this invention. In the wireless communication system shown in FIG. 13, an NMS 110A that manages the entire wireless communication network is different from the NMS 110 shown in FIG. 10, but the other components are exactly the same as the wireless communication system shown in FIG. is there.

  The wireless communication system shown in FIG. 13 sets and registers in the NMS 110A a predetermined threshold value or a dynamically set threshold value as an allowable range with respect to delay / time synchronization / PDV characteristic values. The NMS 110A collects the delay / time synchronization / PDV characteristic values selected according to the current wireless environment from all the wireless communication devices constituting the wireless communication network, as in the NMS 110 of FIG. 10 described above. have. However, unlike the case of the NMS 110 in FIG. 10 described above, the NMS 110A has the delay / time synchronization / PDV characteristics collected from each wireless communication device existing in the transmission path between the first service 121 and the second service 122 that are the communication service request sources. Among these values, even if any one or a plurality of characteristic values pass through any transmission line, the value exceeds the allowable range indicated by a predetermined threshold value or a dynamically set threshold value. It also has a function to confirm whether or not it has fallen.

  When the NMS 110A detects that a state exceeding the allowable range indicated by the threshold value has occurred regardless of the transmission path, any transmission path exceeds the threshold value. An alarm information packet 304 including at least information indicating that there is a delay / time synchronization / PDV characteristic type exceeding the threshold, and generating a communication service request source first service 121 or second service 122 It also has a function to transmit.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely examples of the present invention and do not limit the present invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, in the description of each of the above-described embodiments, packet communication has been described as an example of communication in a wireless communication device. However, the present invention can be applied to other communication methods as well as packet communication. Needless to say, you can.

1 wireless environment information 1A packet processing function ON / OFF information 1B measurement delay information 2 delay / time synchronization / PDV information 3 DA unit 4 SA unit 5 Type unit 6 payload unit 7 FCS unit 10 wireless communication device 10A wireless communication device 10B wireless communication Device 10C Wireless communication device 10D Wireless communication device 11 Packet receiver 11A Receive packet processing function unit 11B Time synchronization message transmission unit 11C Packet reception unit 12 Packet transmission unit 12A Transmission packet processing function unit 12B Time synchronization message reception unit 12C Packet transmission unit 13 Wireless transmission circuit unit 14 Wireless reception circuit unit 15 Wireless antenna 16 Delay / time synchronization / PDV information table 16A Delay / time synchronization / PDV information table 17 Delay / time synchronization / PDV information multiplexing unit 17D Delay / time synchronization / PDV information multiplexing unit 18 Delay / same time / PDV information extraction unit 20 wireless communication device 21 wireless communication device 22 wireless communication device 23 wireless communication device 24 wireless communication device 25 wireless communication device 26 wireless communication device 27 wireless communication device 29a wireless communication device 29b wireless communication device 29c wireless communication device 31 Wireless transmission path 32 wireless transmission path 33 wireless transmission path 101 first wireless communication apparatus 102 second wireless communication apparatus,
103 third wireless communication device,
104 fourth wireless communication device,
105 fifth wireless communication device,
106 sixth wireless communication device,
107 seventh wireless communication device,
108 eighth wireless communication device,
110 NMS (Network Management Device)
110A NMS (network management device)
121 1st Service
122 Second Service
201 First wireless transmission path 202 Second wireless transmission path 301 First delay / time synchronization / PDV information packet 302 Second delay / time synchronization / PDV information packet 303 Transmission path switching information packet 304 Alarm information packet 801 First wireless transmission path 802 Second wireless transmission path 803 Third wireless transmission path 804 Fourth wireless transmission path

Claims (10)

A function for converting a packet received from the upstream device to wireless data and transmitting it to the downstream device via a wireless transmission path, and converting a wireless data received from the downstream device via the wireless transmission path to a packet And having a function of transmitting to the upstream device and a function of switching the wireless transmission path,
Measuring means for measuring delay characteristics, time synchronization characteristics, and PDV (Packet Delay Variation) characteristics related to the wireless transmission path to the wireless communication device on the rear stage side;
Packet delay means for generating information on the measured delay characteristics, time synchronization characteristics, and PDV characteristics as delay / time synchronization / PDV information packets, and transmitting the packets to the wireless communication device on the preceding stage,
The packet transmission means includes
When the generated delay / time synchronization / PDV information packet is to be transmitted to the wireless communication device on the upstream side, or the delay / time synchronization / PDV information packet transmitted from the wireless communication device on the downstream side is transmitted to the upstream side. Packet to be received from the preceding apparatus and the delay characteristics, the time synchronization characteristics, and the PDV characteristics information included in the delay / time synchronization / PDV information packet when transferring to the wireless communication apparatus on the side A wireless communication device having a function of dynamically switching a transmission path for transmitting the packet for each packet to be received based on the type of service required for the packet. As the measuring means,
The delay characteristics, the time synchronization characteristics, and the PDV characteristics obtained by searching based on wireless environment information including the current baud rate and the type of modulation method when transmitting wireless data to the wireless transmission path The wireless communication apparatus according to claim 1, wherein the information includes a delay / time synchronization / PDV information table stored as a predetermined fixed value or a dynamically set value. In addition to the wireless environment information, the delay / time synchronization / PDV information table further includes at least one of compression / decompression and encryption / decryption processing for packet information received from the preceding apparatus. It is a table configuration that can retrieve information including information indicating whether or not to enable a packet processing function to perform processing, and obtain information on the delay characteristics, the time synchronization characteristics, and the PDV characteristics. The wireless communication apparatus according to claim 2, wherein the wireless communication apparatus is a wireless communication apparatus. The packet transmission means includes
When a service with a small delay is requested as the type of service required for the received packet, the value of the delay characteristic is small in the information of the delay characteristic, the time synchronization characteristic, and the PDV characteristic. When a transmission path is selected and a service with good time synchronization is requested, a transmission path with a small value of the time simultaneous characteristic is selected from the delay characteristic, time synchronization characteristic, and PDV characteristic information. When a service with a small PDV is requested, a transmission path having a small value of the PDV characteristic is selected from among the delay characteristic, the time synchronization characteristic, and the PDV characteristic information, and is dynamically switched. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is a wireless communication apparatus. Any one or more of the delay characteristic, the time synchronization characteristic, and the PDV characteristic value included in the delay / time synchronization / PDV information packet to be transmitted by the packet transmission unit is set as an allowable range. When a predetermined threshold value or a dynamically set threshold value is exceeded, the packet transmission means multiplexes the alarm information indicating that to the delay / time synchronization / PDV information packet and transmits it. The wireless communication apparatus according to any one of claims 1 to 4. A function for converting a packet received from the upstream device to wireless data and transmitting it to the downstream device via a wireless transmission path, and converting a wireless data received from the downstream device via the wireless transmission path to a packet And an NMS (Network Management System) device for managing the entire wireless communication network including one or more wireless communication devices having a function of transmitting to the upstream device and a function of switching the wireless transmission path,
The NMS device is
Delay including measurement results of delay characteristics, time synchronization characteristics, and PDV (Packet Delay Variation) characteristics related to the wireless transmission path from all the wireless communication apparatuses constituting the wireless communication network to the wireless communication apparatus on the subsequent stage side / Time synchronization / PDV information packet received,
Based on the delay characteristics, the time synchronization characteristics, and the PDV characteristics information included in each received delay / time synchronization / PDV information packet, it is determined whether or not to switch transmission paths, and transmission A radio communication system, characterized in that a transmission path switching information packet for instructing path switching is generated and transmitted to the corresponding radio communication apparatus. The NMS device is
Any one or more of the delay characteristic, the time synchronization characteristic, and the PDV characteristic value included in the delay / time synchronization / PDV information packet collected from each of the wireless communication devices is a packet communication service request source. Alarm information indicating that if any of the transmission paths that transfer packets between the above devices exceeds a threshold value that is set in advance as a permissible range or a dynamically set threshold value, The wireless communication system according to claim 6, wherein a packet is generated and transmitted to the communication service request source device. A function for converting a packet received from the upstream device to wireless data and transmitting it to the downstream device via a wireless transmission path, and converting a wireless data received from the downstream device via the wireless transmission path to a packet Then, wireless communication is performed by a wireless communication device having a function of transmitting to the upstream device and a function of switching the wireless transmission path,
A measurement step of measuring a delay characteristic, a time synchronization characteristic, and a PDV (Packet Delay Variation) characteristic related to the wireless transmission path with the wireless communication device on the rear stage side;
A packet transmission step of generating information on the measured delay characteristics, time synchronization characteristics, and PDV characteristics as a delay / time synchronization / PDV information packet and transmitting the information to a wireless communication device on a preceding stage;
The packet transmission step includes:
When the generated delay / time synchronization / PDV information packet is to be transmitted to the wireless communication device on the upstream side, or the delay / time synchronization / PDV information packet transmitted from the wireless communication device on the downstream side is transmitted to the upstream side. Packet to be received from the preceding apparatus and the delay characteristics, the time synchronization characteristics and the PDV characteristics information included in the delay / time synchronization / PDV information packet when transferring to the wireless communication apparatus on the side And a function of dynamically switching a transmission path for transmitting the packet for each received packet based on the type of service required for the wireless communication method. As the measurement step,
The delay characteristics, the time synchronization characteristics, and the PDV characteristics obtained by searching based on wireless environment information including the current baud rate and the type of modulation method when transmitting wireless data to the wireless transmission path 9. The wireless communication method according to claim 8, wherein the information includes a delay / time synchronization / PDV information table stored as a predetermined fixed value or a dynamically set value. Any one or more of the delay characteristic, the time synchronization characteristic, and the PDV characteristic value included in the delay / time synchronization / PDV information packet to be transmitted by the packet transmission step is set as an allowable range. When a predetermined threshold value or a dynamically set threshold value is exceeded, the packet transmission step multiplexes and transmits alarm information indicating that to the delay / time synchronization / PDV information packet. A wireless communication method according to claim 8 or 9.

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