Technical field
[0001]
　The disclosure herein, for the channel search in a point-to-point radio systems.
Background technique
[0002]
　Point-to-point radio system using a microwave or a millimeter wave or the like is known (see, for example Patent Documents 1 and 2). In a point-to-point radio system, perform a digital communication two communication devices via a point-to-point wireless link. Specifically, each communication device comprises a directional antenna for communicating with the remote device by the point-to-point wireless technology, direct a directional beam to the opposite apparatus. Thus, point-to-point radio link is established between the two communication devices. In this specification, each of the two communication devices constituting a point-to-point radio system, i.e. a communication device using a point-to-point wireless technology to communicate with the opposing device, referred to as a point-to-point radio system.
[0003]
　Point-to-point radio system, for example, used in mobile backhaul. Mobile backhaul refers to a network that connects network for connecting between the base station and the higher-level network nodes installed sites of cellular communication systems, and between base stations. The base station, for example, Base Transceiver Station (BTS), NodeB, or eNodeB. Higher-level network node, e.g., Base Station Controller (BSC), a Radio Network Controller (RNC), Serving General Packet Radio Service Support Node (SGSN), Serving Gateway (S-GW), or Mobility Management Entity (MME). Use of point-to-point radio system, as compared to wired connection using an optical fiber, ease of network construction, high economic efficiency, and there is a merit in terms of the relaxation of restrictions on the installation location of the base station.
[0004]
　Point-to-point radio system generally support two-way simultaneous communication (full duplex). Accordingly, point-to-point radio link comprises two radio link directions. In this specification, referred to one of the two radio links of the bidirectional forward link, called the other as the reverse link. Further, point-to-point when the wireless system is used for mobile backhaul, upper from a network node in the direction of the radio link towards the base station is defined as the forward link, reverse link direction from the base station to the upper network node It is defined as.
[0005]
　In one example, a point-to-point wireless system uses a two-way simultaneous communication Frequency Division Duplexing (FDD) or Time Division Duplex for (full-duplex communication) (TDD). For FDD, two radio channels that are different are used in two radio link bidirectional. For TDD, 1 single radio channel is used by time division into two radio link bidirectional. Radio channel may also be referred to as a radio frequency carrier (radio frequency carrier).
CITATION
Patent literature
[0006]
Patent Document 1: European Patent No. 1545037 Pat
Patent Document 2: Japanese Unexamined Patent Publication No. 2011-244186
Summary of the invention
Problems that the Invention is to Solve
[0007]
　Present inventors have mobile backhaul plurality of point-to-point radio systems placed on the communication path between the base station and the higher-level network node assumes the use radio channel used for a point-to-point radio links It was examined procedure for switching.
[0008]
　Some failure in a point-to-point radio links (for example, degradation in the receiving quality due to interference or radio link disconnection) occurs and can not be normally received in the radio link, point-to-point wireless systems, failure occurs it is necessary to switch the said one radio channel being used by the radio link (carrier wave) to another radio channel (carrier wave). When switching using a radio channel, typically it is necessary to search the unused radio channel for good reception quality in the radio link (Description clear channel or unoccupied channel). Searching for the unused radio channel, channel search, the channel scanning is referred to as channel selection, or channel assessment or the like.
[0009]
　Channel search may be performed in advance prior to the failure. For example, point-to-point wireless device may perform a channel search in a scheduled operation stop period by the operator. In any event, the service in order to perform the channel search (that is, communication of a point-to-point radio link) from having to temporarily stop, opportunities that can perform channel search is limited In particular it should be noted.
[0010]
　If the base station and one system of a plurality of point-to-point radio system located on the communication path between the higher network node to perform the channel search is believed that the communication route becomes temporarily unavailable . In particular, addition of a point-to-point radio system located downstream close to the base station than the point-to-point radio system performing channel search is considered to temporarily lose path leading to the upper network. Thus, in one example, when the upstream point-to-point radio system close to the upper network node performs channel search, it is inefficient to perform a channel search with also other point-to-point radio system downstream of the system there might be.
[0011]
　Thus, one object to be achieved is the embodiment disclosed herein, contributes to making the channel search efficiently point-to-point radio system, mobile backhaul system, communication control method, and program it is to provide. Incidentally, this objective should embodiments disclosed herein may be noted that only one of a plurality of object to be achieved. Other objects or problems and novel features will become apparent from the description, or the accompanying drawings.
Means for Solving the Problems
[0012]
　In one embodiment, point-to-point radio device includes a wireless interface, a communication interface, the signal processing unit, and a control unit. The wireless interface, establishing a first point-to-point radio link between the counter device is configured to communicate with the counter device by using the first point-to-point radio links. The signal processing unit is configured to relay traffic between the radio interface and the communication interface. Wherein, upon receiving a first notification that the second point-to-point radio links operated by said other point-to-point radio system is unavailable, wherein the first point-to-point It is configured to perform a first channel search to search the available radio channels available for the radio link.
[0013]
　In one embodiment, mobile backhaul system includes a first and second point-to-point radio systems to operate the first and second point-to-point radio links respectively. It said first and second point-to-point radio systems together, used to connect between communicably of the upper network node located on a communication path and with the base station between the base station and the higher-level network nodes It is. Wherein the first point-to-point radio systems, as compared to the second point-to-point radio system, is arranged downstream closer to the base station on the communication path. In contrast, the second point-to-point radio systems, as compared with the first point-to-point radio system, is disposed upstream closer to the higher-level network nodes on the communication path. Further, the first point-to-point radio system, when the second channel search to search the available radio channels available to said second point-to-point radio link is carried out, the first point-to-point It is configured to perform a first channel search to search the available radio channels available for the radio link.
[0014]
　In one embodiment, the communication control method performed by the point-to-point wireless device, the first of the notification indicating that the second point-to-point wireless links that are operated by other point-to-point wireless system is unavailable when receiving comprises performing a first channel search to search a first point-to-point radio links available free radio channels operated by the point-to-point radio system.
[0015]
　In one embodiment, the program, when loaded into a computer, comprising instructions for causing a communication control method described above to the computer (software code).
Effect of the invention
[0016]
　According to the embodiment described above, contributes to making the channel search efficiently point-to-point radio system, can be provided mobile backhaul system, communication control method, and program.
Brief description of the drawings
[0017]
[1] is a diagram showing a configuration example of a mobile backhaul according to the first embodiment.
FIG. 2 is a block diagram showing a configuration example of a point-to-point radio apparatus according to the first embodiment.
3 is a flowchart showing an example of a channel search procedure for executing the point-to-point radio apparatus according to the first embodiment.
4 is a sequence diagram showing an example of the execution procedure of the channel search in mobile backhaul according to the first embodiment.
5 is a sequence diagram showing an example of the execution procedure of the channel search in mobile backhaul according to the second embodiment.
6 is a sequence diagram showing an example of the third channel search in mobile backhaul according to an embodiment of the execution procedure.
DESCRIPTION OF THE INVENTION
[0018]
　Hereinafter, specific embodiments will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding components are denoted by the same reference numerals, for clarity of description, repeated explanation is omitted as appropriate.
[0019]

　FIG 1 shows a configuration example of a mobile backhaul 1000 according to the present embodiment. Mobile backhaul 1000 is a network for connecting the base station 5 and the upper network node 6, includes a plurality of point-to-point radio system 1. The base station 5, for example, an eNodeB of Global System for Mobile Communications (GSM (registered trademark)) and CDMA2000 of BTS, NodeB of Universal Mobile Telecommunications System (UMTS), or Long Term Evolution (LTE). Higher network node 6 may be a entity Radio Access Network (RAN), or may be a core network entity. Higher network node 6, a BSC, RNC, SGSN, S- GW, or MME. In the configuration example of FIG. 1, mobile backhaul 1000 is included to connect between the two base stations 5A and 5B higher level network node 6, three point-to-point radio system. 1A, 1C, and 1E.
[0020]
　Point-to-point wireless system 1A is comprised of a pair of point-to-point wireless devices 10A and 10B. Radio device 10A and 10B, for example, establishes a point-to-point radio links 11A using microwaves or millimeter waves, and is configured to communicate with each other through a point-to-point radio link 11A. Point-to-point wireless link. 11A, including two-way two of the radio link, that is, the forward link 12A and reverse link 13A.
[0021]
　Point-to-point wireless system 1C is composed of a pair of point-to-point wireless device 10C and 10D. Wireless devices 10C and 10D communicate with each other through a point-to-point radio link 11C. Point-to-point wireless link. 11C, it includes a forward link 12C and reverse link 13C.
[0022]
　Point-to-point wireless system 1E is composed of a pair of point-to-point wireless device 10E and 10F. Wireless device 10E and 10F is, to communicate with each other via a point-to-point wireless link 11E. Point-to-point wireless link. 11E, includes a forward link 12E and reverse link 13E.
[0023]
　Each of the wireless devices 10A ~ 10 F has a radio interface in addition to (radio port) 1 or more communication interfaces (communication ports). Communication interface handles packet traffic, time division multiplexed (TDM) traffic, Asynchronous Transfer Mode (ATM) traffic, or the frame relay traffic. Communication interface for packet traffic, for example, a LAN interface connectable to the Local Area Network that conforms to the IEEE 802.3 series (LAN). The communication interface for TDM traffic, for example, a T1 / E1 interface or Synchronous Optical Network (SONET) / Synchronous Digital Hierarchy (SDH) interfaces. TDM Toraffiku, the ATM traffic, and frame relay traffic may be forwarded in a packet switched network using a pseudo-WIRE technology.
[0024]
　Further, each of the wireless devices 10A ~ 10 F has a signal processing unit for relaying traffic between one or more communication interfaces and a wireless interface. The signal processing unit may be a multiplexer for fixedly multiplexes the received Layer 2 Protocol Data Unit (PDU) or layer 3 PDUs in one or more communication interfaces. Further, the signal processing unit may be a layer 2 switch or Layer 3 switches. Layer 2 switch or Layer 3 switches the signal processing unit performs the forwarding / routing based on the address information contained in the header of the layer 2 PDUs or layer 3 PDUs. Typical Layer 2 PDU is a Media Access Control (MAC) frame, typical Layer 3 PDU is an Internet Protocol (IP) packets. However, the signal processing section of the wireless device 10 may be treated with other Layer 2 PDUs or layer 3 PDUs. For example, the signal processing unit of the radio apparatus 10 may perform a forwarding MPLS-Labeled packets based on Multi-Protocol Label Switching (MPLS).
[0025]
　It will be described in more detail configuration example of a mobile backhaul 1000 shown in FIG. Point-to-point radio systems 1A and 1E are arranged in the communication path between the base station 5A and the upper network node 6, it is used for communicatively coupling between the base station 5A and the upper network node 6. Further, point-to-point radio system 1C and 1E are arranged in the communication path between the base station 5B and the upper network node 6, it is used for communicatively coupling between the base station 5B and the upper network node 6 . That is, point-to-point radio system 1E upstream is coupled to the two point-to-point radio systems 1A and 1B on the downstream side, and transfers the aggregate traffic for multiple base stations 5A and 5B.
[0026]
　Packet communication device 20, data packets between the base station 5A and 5B and the upper network node 6 (e.g., Layer 2 Protocol Data Unit (PDU), or Layer 3 PDUs) for relaying. Packet communication device 20 may be a layer 2 switch or Layer 3 switches. The packet communication device 20 may be a label switch router that performs forwarding of MPLS-Labeled packets (LSR) based on Multi-Protocol Label Switching (MPLS).
[0027]
　Point-to-point wireless device 10B communication interface (for example, LAN interface), can communicate with a point-to-point wireless device 10D and 10E communication interface (for example, LAN interface). For example, point-to-point wireless device 10B, 10D, and 10E are located at the same site.
[0028]
　The configuration example of FIG. 1 is only an example. For example, in the configuration example of FIG. 1, the packet communication device 20 may be omitted. Packet communication device 20 is effective when or provide aggregate multiple base stations 5A and 5B, a direct communication interface does not pass through the higher level network node 6 between a plurality of base stations 5A and 5B . The most simple example of the configuration of mobile backhaul 1000 is a configuration not including the packet communication equipment 20. However, additional packet communication equipment between base station 5A and the wireless device 10A may be disposed. Similarly, additional packet communication equipment between the base station 5B and the wireless device 10C may be disposed. In addition, the wireless device 10B, 10D, and 10E additional packet communication equipment between may be arranged.
[0029]
　The following describes channel search operation point-to-point radio system 1A according to this embodiment. If the point-to-point wireless system 1A of the downstream side, the channel search of the point-to-point wireless link 11E in a point-to-point wireless system 1E of the upstream side (the forward link 12E or reverse link 13E or both) is performed, It is configured to perform a channel search of its point-to-point radio links 11A (forward link 12A or reverse link 13A or both).
[0030]
　When the point-to-point wireless system 1E of the upstream side to perform the channel search of the radio link 11E, point-to-point wireless system 1A of the downstream side, temporarily lose the communication path that leads to the upper network node 6. Therefore, the period in which the channel search on the upstream side of the radio link 11E is performed, it can be said that the downstream side of the radio link 11A is allowed easy period to be cut. This is because you can not communicate between the base station 5A and the higher-level network node 6 by the cutting of the radio link 11E. Focusing on this point, in the present embodiment, when a channel search is performed in a point-to-point radio system 1E upstream performs channel search together also point-to-point radio system 1A of the downstream side. Accordingly, the present embodiment can perform the channel search efficiently.
[0031]
　For example, a wireless device 10A or 10B, or both are, explicitly or implicitly indicate notify the upstream side of the point-to-point wireless link 11E (forward link 12E or reverse link 13E or both) is unavailable in response to receiving the may start the channel search of the point-to-point radio links 11A of its own (forward link 12A or reverse link 13A or both). The notification may be explicitly or implicitly indicate notification that the channel search on the upstream side of the point-to-point wireless link 11E is performed.
[0032]
　The notification, when the channel search on the upstream side of the point-to-point radio link 11E is performed, a point-to-point radio system 1E (e.g., wireless device 10E) may be a control message sent from. The control message may be a request for execution of a channel search for the upstream side of the point-to-point radio systems 1E from the downstream side of the point-to-point radio system 1A.
[0033]
　Further, the notification may be detected as the link-down of the communication interfaces that result from point-to-point radio link 11E on the upstream side is unavailable. Specifically, the radio device 1E, when a radio link 11E (forward link 12E or reverse link 13E or both) is unavailable, a communication interface for communicating with the wireless device 10B, and 10C (e.g., the output of the LAN interface) may be stopped. Thus, the wireless device 10B, own communication interface (e.g., LAN interface) in it is possible to detect a link-down can initiate channel search of its radio link 11A in response to the detection of link-down.
[0034]
　Further, the notification is via an Operation and Maintenance (OAM) system, not shown, may be from the upstream side of the point-to-point radio system 1E is sent to a point-to-point radio system 1A of the downstream side.
[0035]
　Channel search by a point-to-point radio system 1A may be made to only one direction of the link (link 12A or 13A), together with respect to two-way two links (links 12A and 13A) it may be carried out. Channel search by the point-to-point wireless system 1E is also similar to this.
[0036]
　Factors triggering the channel search by the upstream side of the point-to-point radio system 1E is not particularly limited. For example, a point-to-point radio systems. 1E, degradation in the receiving quality of the radio link 11E due to interference, or in response to detecting the disconnection of a radio link 11E by some cause, initiate the channel search of the radio link 11E it may be. Further, point-to-point radio system 1E according to the instruction or a predetermined schedule of the operator may start the channel search of a wireless link 11E.
[0037]
　Result of the channel search in a point-to-point radio system 1A may for example be used as follows. In one example, point-to-point radio system 1A, better than the reception quality of the used radio channel reception quality of the available radio channel obtained by the channel search (Description clear channel or unoccupied channel) are currently used in wireless link 11A in some cases, it may be modified to use the radio channel to an unused radio channel obtained by the channel search. Further, in another example, a point-to-point radio system 1A, holds the result of the channel search, when a failure in the future radio link 11A is generated, held to select a new use radio channels may utilize channel search results had been. In yet another example, a point-to-point radio system 1A may transmit the OAM system, not shown the result of the channel search.
[0038]
　In the above description has been mainly described the operation of the point-to-point radio systems 1A, may operate similarly to the point-to-point radio system 1C also system 1A of another downstream.
[0039]
　Subsequently below will describe a configuration example of a point-to-point radio apparatus 10 according to the present embodiment. Figure 2 is a block diagram showing a configuration example of the wireless device 10. Radio interface (radio port) 101 is connected to the antenna 105, performs point-to-point wireless transmission between the opposing radio apparatus. Radio apparatus 10 shown in FIG. 2 has at least one LAN interface (LAN port) 102. LAN interface 102 may be support a wired LAN, may support wireless LAN. If you want to support a wired LAN, the LAN interface 102, LAN cable 106, such as twisted pair cable or optical fiber cable is connected.
[0040]
　Radio apparatus 10 shown in FIG. 2, comprises a layer 2 switch unit 103. Layer 2 switching unit 103 transfers the layer 2 PDUs between at least one LAN interface 102 and the wireless interface 101. Incidentally, as already mentioned, the layer 2 switch 103 is only one example of a signal processing unit for the wireless device 10 has. For example, the wireless device 10, in place of the layer 2 switch section 103, may have a multiplexer or Layer 3 switch.
[0041]
　Controller 104, other point-to-point wireless system 1 (that is, the point of the upstream radio system) is a point-to-point wireless link 11, which is operated has received an explicit or implicitly indicate notification that it is unusable by If the is configured to perform a channel search to search for a point-to-point radio links available free radio channel to operate itself.
[0042]
　3 is a flowchart showing a control procedure performed by the controller 104. In step S11, the controller 104 receives a notification that the point-to-point channel search of the radio link on the upstream side is performed. In response to receiving the notification, the controller 104, at step S12, performs the channel search of its point-to-point radio links.
[0043]
　Figure 4 is a sequence diagram showing an example of the control procedure including a channel search and use the radio channel change in a mobile backhaul 1000. In step S101, a point-to-point radio device 10E detects the deterioration of the reception quality of the forward link 12E. Change procedure uses radio channels is typically performed in order to avoid interference with a particular radio channel received from other radio systems. Therefore, the reception quality to be monitored in step S101 to trigger the change procedure of using the radio channel may typically be a Signal to Interference plus Noise Ratio (SINR). Furthermore, in order to distinguish it from the weather conditions worse or forward link 12E prospects by shielding by some structure (line of sight) is degraded, in addition to the SINR received signal strength (Received Signal Strength Indicator (RSSI)) There may also be used.
[0044]
　In step S102, in response to the reception quality degradation of the forward link 12E is detected, the wireless device 10E, using the current use radio channels of the reverse link 13E, the predetermined notification to the wireless device 10F Send. Predetermined notification in step S102, in one example, may indicate that the channel search of the forward link 12E is performed in the wireless device 10E (channel search notification). In combination or with which Alternatively, predetermined notification in step S102 may be indicate that a fault is detected in the forward link 12E, the reverse link 13E execution request for channel search for a wireless device 10F the may indicate.
[0045]
　In step S103, the wireless device. 10E, the wireless device 10B which constitutes a point-to-point radio system 1A of the downstream side, and transmits a predetermined notification. Predetermined notification in step S103, similar to the notification of step S102, which may indicate that the channel search of the forward link 12E is executed (channel search notification). In combination or with which Alternatively, predetermined notification in step S103 may be indicate that the fault in the forward link 12E is detected, execution of the channel search of the point-to-point radio link 11A on the downstream side request may indicate. The wireless device 10B, in response to receiving the notification of step S103, in order to start the channel search of the forward link 12A by the wireless device 10A, and transmits the channel search notification to the wireless device 10A (step S104).
[0046]
　In step S105A, the wireless device 10A, to run the channel search of the forward link 12A. Similarly, in step S105e, the wireless device 10E performs channel search of the forward link 12E. In addition, channel search in step S105A is, do not need to be carried out in complete synchronization and channel search in step S105E. Channel search at step S105A is preferably performed in the forward link 12E within the stop period including the channel search at step S105e.
[0047]
　In step S106, the wireless device 10E, based on the result of the channel search in step S105e, determines a new radio channel to be used as a used radio channels of the forward link 12E. The wireless device 10E, using a reverse link 13E, and transmits a channel change instruction to the wireless device 10 F. The channel change instruction indicates a new use radio channels of the forward link 12E, which is determined in the wireless device 10E.
[0048]
　In step S107E and S107F, wireless devices 10E and 10F together, the use radio channels of the forward link 12E, to change to the new radio channel determined in step S106. Operation in step S107E, in response to the transmission of the change instruction step S106, or may be initiated in response to a predetermined standby time from the transmission of the change instruction has elapsed. Operation in step S107F, in response to receiving the change instruction step S106, or may be initiated in response to a predetermined standby time from the reception of the change instruction has elapsed. As a result, the forward link. 12E, to return to a usable state.
[0049]
　Step S108, S109A, and S109B shows the change procedure of use radio channels of the forward link 12A of the point-to-point wireless system 1A of the downstream side. This change procedure, the procedure on the upstream side of the point-to-point wireless system 1E (step S106, S107E, and S107F) and may be carried out in the same manner. Note that steps S 108, S109A, and S109B is not necessary. As already explained, the result of channel search in a point-to-point radio system 1A on the downstream side, for example, are held in point-to-point radio system 1A in order to use in the event of a failure of the future forward link 12A it may be, may be transmitted to the OAM system, not shown.
[0050]
　Switching procedure using the wireless channel shown in FIG 4 is only an example. It signaling and control procedures for switching the operational radio channel can be variously modified it will be readily understood by those skilled in the art. For example, in FIG. 4, but shows a procedure for switching use only radio channels of the forward link (forward link 12E), using radio channels of the forward link 12E and reverse link 13E may be switched simultaneously. Some variations are described in the following second and third embodiments.
[0051]

　The present embodiment describes a modification of the control procedure described in the first embodiment. Configuration example of a point-to-point radio system according to the present embodiment is the same as FIG.
[0052]
　5 is a sequence diagram showing an example of the control procedure including a channel search and use the radio channel change. In the example of FIG. 5, as compared with the example of FIG. 4, channel search and use the radio channel change is deformed to be made to two-way radio link.
[0053]
　Processing in step S 201 ~ S 204 in FIG. 5 are similar to those of the processing in step S 101 ~ S 104 in FIG. 4, a description thereof will be omitted.
[0054]
　In step S205A, the radio device 10A performs the channel search of the forward link 12A. In step S205b, the wireless device 10B performs the channel search in the reverse link 13A. In step S205E, the wireless device 10E performs channel search of the forward link 12E. In step S205F, the wireless device 10F performs the channel search in the reverse link 13E.
[0055]
　Processing in step S206, S207E, and S207F in FIG. 5, step S106, S107E in FIG. 4, and because it is similar to the processing in S107F, the description thereof is omitted here.
[0056]
　Step S208, S209E, and S209F it is, shows the change procedure of using a radio channel of the reverse link 13E of a point-to-point radio system 1E of the upstream side. Step S208, S209E, and S209F, it is preferable reception quality than the present use radio channels of the reverse link 13E is performed when the good radio channel is found in the channel search step S205F. That is, in step S208, the wireless device 10F on the basis of the result of the channel search in step S205F, determines a new radio channel to be used as a used radio channel reverse link 13E. The wireless device 10F, using a forward link 12E, and transmits a channel change instruction to the wireless device 10E. The channel change instruction indicates a new use radio channels in the reverse link 13E, which is determined in the wireless device 10 F. In step S209E and S209F, wireless devices 10E and 10F together, the use radio channels in the reverse link 13E, to change to a new use radio channel determined in step S208.
[0057]
　Step S210 ~ S212,213A, and S213B shows the change procedure of use radio channels of the forward link 12A and reverse link 13A of the point-to-point wireless system 1A of the downstream side. In step S210, the wireless device 10A transmits the result of the channel search of the forward link 12A (step S205A) to the wireless device 10B. At step S211, the wireless device 10B, based on the result of the channel search of the forward link 12A and the reverse link 13A (step S205A and S205b), determines a new use radio channels of the forward link 12A and the reverse link 13A to.
[0058]
　At step S212, the wireless device 10B transmits a channel change instruction to the wireless device 10A. The channel change instruction indicates a new use radio channel links 12A and 13A determined in step S211. In step S213A, and S213b, the wireless device 10A and 10B together, the use radio channels of the forward link 12A and the reverse link 13A, is changed to a new radio channel determined in step S211.
[0059]
　Step S210 ~ S212,213A, and S213B of change procedure, one of the wireless device 10B is shown the procedure to determine the two-way use radio channel. However, this point may be changed as appropriate. For example, the wireless device 10A is decided to use the radio channels of the forward link 12A, the wireless device 10B may determine the use radio channels in the reverse direction link 13A. In addition, step S210 ~ S212 and S213A and S213B of change procedure may not be carried out.
[0060]

　The present embodiment describes a modification of the control procedure described in the first embodiment. Configuration example of a point-to-point radio system according to the present embodiment is the same as FIG.
[0061]
　FIG 6 is a sequence diagram showing an example of the control procedure including a channel search and use the radio channel change. In the example of FIG. 6, on the basis of the result of the channel search by both of the two point-to-point radio systems 1A and 1E, each of the operational radio channel point-to-point radio systems 1A and 1E are determined.
[0062]
　Processing steps S301 ~ S304, S305A, and in S305E in FIG. 6, steps S101 ~ S104, S105A of FIG. 4, and because it is similar to the processing in S105e, the description thereof is omitted here.
[0063]
　In step S306, the wireless device 10A transmits the result of the channel search of the forward link 12A (step S305a) to the wireless device 10B. At step S307, the wireless device 10B transfers the result of the channel search of the forward link 12A received (step S305a) to the wireless device 10E. In step S308, the wireless device 10E, the wireless device 10A forward link 12A channel search result of the by, and themselves using both of (a wireless device 10E) forward link 12E channel search result of the by, the forward link 12A and 12E to determine each of the use of radio channel.
[0064]
　As an example, the wireless device 10E, as different radio channels on the forward link 12A and 12E (radio frequency carrier) is used, may be determined their use radio channels. Accordingly, it prevents a forward link 12A and 12E interfere with each other.
[0065]
　In another example, the wireless device 10E, from the forward link 12A and 12E of the two channel search available radio channel obtained together good reception quality in (Description clear channel or unoccupied channel), the forward link 12A and each of the use radio channel of 12E may be determined. In other words, the wireless device. 10E, product set of the available radio channel set obtained by the channel search of the forward link 12A available radio channel set and the forward link 12E obtained in the channel search of the (common portion, intersection) from inside, it may determine the respective use radio channels of the forward link 12A and 12E. If you are susceptible to interference from other wireless systems in a radio channel that there is a point-to-point wireless system 1E, also might be susceptible to interference in the radio channel arranged point-to-point wireless system 1A near. According to the example shown here, it can be excluded radio channel there is a risk of such interference from the selection.
[0066]
　Continuing with the description back to FIG. 6. At step S309, the wireless device 10E transmits a channel change instruction to the wireless device 10 F. The channel change instruction indicates a new use radio channels of the forward link 12E determined in step S308. In step S310E and S310F, wireless devices 10E and 10F together, the use radio channels of the forward link 12E, to change to the new radio channel determined in step S308.
[0067]
　In step S 311, the wireless device 10E transmits a channel change instruction to the wireless device 10B. The channel change instruction indicates a new use radio channels of the forward link 12A determined in step S308. In step S312, the wireless device 10B transfers the channel change instruction received from the wireless device 10E to the wireless device 10A. In step S313A and S313B, the radio device 10A and 10B together, the use radio channels of the forward link 12A, is changed to a new radio channel determined in step S308.
[0068]
　The procedure of FIG. 6 is only one example. For example, the entity that determines the use radio channels of the forward link 12A and 12E are the wireless device 10F without other wireless devices, for example, may be a wireless device 10A or 10B. Further, principal deciding to use radio channels of the forward link 12A and 12E may be the OAM system, not shown. In this case, the wireless device 10A and 10E, the forward link 12A channel search result of and the forward link 12E channel search results of may be transmitted to the OAM system, respectively.
[0069]

　The first to third embodiments described above may be implemented in appropriate combination. For example, it may be combined second and third embodiments. Specifically, using the radio channel of the reverse link 13A and 13E, the channel search results in the reverse link 13A by the wireless device 10B, and are determined using both the channel search results in the reverse link 13E by the wireless device 10F it may be.
[0070]
　Aforementioned radio device 10A, 10B, 10C, 10D, 10E, and the processing for the channel search and use the radio channel changes made by 10F may be implemented using semiconductor processing apparatus comprising a Application Specific Integrated Circuit (ASIC) . These processes, at least one processor may be realized by executing a program on a computer containing (eg microprocessor, Micro Processing Unit (MPU), Central Processing Unit (CPU)). Specifically, to create one or more programs including instructions for performing the algorithm described with reference to a sequence diagram and the like herein in a computer system, be supplied to the program in a computer system good.
[0071]
　This program is stored using a non-transitory computer-readable media of various types (non-transitory computer readable medium), it can be supplied to the computer. Non-transitory computer-readable media, including the recording medium with various types of entities (tangible storage medium). Examples of non-transitory computer readable media include magnetic recording medium (eg a flexible disc, magnetic tape, hard disk drive), a magneto-optical recording medium (eg optical disk), Compact Disc Read Only Memory (CD-ROM), CD- including R, CD-R / W, a semiconductor memory (eg a mask ROM, Programmable ROM (PROM), Erasable PROM (EPROM), flash ROM, Random Access memory (RAM)). Further, the program may be supplied to the computer by a transitory computer-readable media of various types (transitory computer readable medium). Examples of transitory computer readable media include electric signals, optical signals, and electromagnetic waves. Transitory computer-readable media includes wired communications path, such as wires and optical fibers, or via a wireless communication path, can be supplied to program the computer.
[0072]
　In addition, the embodiments described above are only examples for the application of the technical idea obtained by the inventors of the present invention. That is, the technical concept is not limited only to the embodiments described above, it is needless to say various modifications are possible.
[0073]
　This application claims priority based on Japanese Patent Application No. 2014-054547, filed on March 18, 2014, the entire disclosure of which is incorporated herein.
Description of the code
[0074]
1A, 1C, 1E point-to-point wireless system
5A, 5B base station
6 higher-level network node
10A, 10B, 10C, 10D, 10E, 10F point-to-point wireless devices
11A, 11C, 11E point-to-point wireless link
12A, 12C, 12E The forward link
13A, 13C, 13E reverse link
20 packet communication equipment
101 wireless interface
102 LAN interface
103 layer 2 switch section
104 controller
1000 mobile backhaul

The scope of the claims
[Claim 1]
　Establishing a first point-to-point radio link between the counter device, wherein a wireless interface configured to communicate with the counter device by using the first point-to-point radio links,
　other point-to-point radio a communication interface connected to a network including a system,
　and configured signal processing means so as to relay traffic between the radio interface and the communication interface,
　a second operated by said other point-to-point radio systems If the point-to-point radio link receives the first notification indicating that it is unavailable, so as to perform a first channel search to search the available radio channels available to said first point-to-point radio links and configured controller,
point-to-point radio device comprising a.
[Claim 2]
　Wherein the first notification, the control message transmitted from the other point-to-point radio system if the second channel search to search the available radio channels available to said second point-to-point radio link is performed including point-to-point radio apparatus according to claim 1.
[Claim 3]
　The control message, the explicitly or implicitly indicates that the second channel search is performed to search the available radio channels available to the second point-to-point radio links, point-to-according to claim 2 point a wireless device.
[Claim 4]
　Wherein the control message comprises a request to perform the first channel search, point-to-point radio apparatus according to claim 2.
[Claim 5]
　The first notification includes the link down of the communication interfaces that result from the second point-to-point radio link is unavailable, point-to-point radio apparatus according to claim 1.
[6.]
　Wherein the control means receives the first notification via the communication interface, point-to-point radio apparatus according to any one of claims 1 to 5.
[7.]
　The point-to-point radio device and the first point-to-point radio systems and the other point-to-point radio system constituted by the opposite device are both, disposed on a communication path between the base station and the higher-level network node and is used for communicably connecting between the upper network node and said base station,
　said first point-to-point radio systems, as compared to the other point-to-point radio system, said on the communication path is arranged near the downstream side to the base station,
　the other point-to-point radio systems, as compared with the first point-to-point radio system, it is disposed upstream closer to the higher-level network nodes on the communication path ,
point-to-point radio apparatus according to any one of claims 1 to 6.
[8.]
　Wherein the control unit transmits a result of the first channel search said other point-to-point radio system, or Operation and Maintenance (OAM) system, use to be used in the first point-to-point radio links receiving a second notification of a wireless channel from the other point-to-point radio systems or the OAM system, point-to-point radio apparatus according to any one of claims 1 to 7.
[9.]
　The use radio channels will be determined the first channel search results, and based on both the second channel search results to search the available radio channels available to said second point-to-point radio links , point-to-point wireless device according to claim 8.
[10.]
　Wherein the control unit receives the result of the second channel search to search the available radio channels available to said second point-to-point radio links from the other point-to-point radio system, the first point-to- It is determined based on the use radio channels to be used in point radio links to both the results of the result and said second channel search of the first channel search, according to any one of claims 1 to 7, point-to-point wireless devices.
[11.]
　Said control means further wherein said first channel search results and the second of said determined based on both the result of the channel search second point-to-point radio link using a radio channel to be used in to notify the other point-to-point radio systems, point-to-point wireless device according to claim 10.
[12.]
　The first and a second point-to-point radio system, to operate the first and second point-to-point radio links respectively
　said first and second point-to-point radio systems together, the base station and the higher-level network nodes It is used to connect between the upper network node and arranged and the base station on a communication path between the possible communicate,
　the first point-to-point radio system, the second point-to-point radio compared to the system, the arranged downstream closer to the base station on a communication path,
　said second point-to-point radio systems, as compared with the first point-to-point radio system, on the communication path It disposed near the upstream side to the upper network node,
　wherein the first point-to-point radio system, a second channel search to search the available radio channels available to said second point-to-point radio link is performed If the is configured to perform a first channel search to search the available radio channels available to said first point-to-point radio links,
mobile backhaul system.
[13.]
　The first point-to-point wireless systems, in response to receiving an explicit or implicit in the first notification indicating that the second channel search is carried out from the second point-to-point wireless system on, it performs the first channel search, the mobile backhaul system of claim 12.
[14.]
　Wherein the first notification indicates that the second point-to-point radio link is unavailable, mobile backhaul system of claim 13.
[15.]
　The first notification includes an execution request of said first channel search, the mobile backhaul system of claim 13.
[16.]
　Wherein the first point-to-point radio system comprises a communication interface connected to a network including the second point-to-point radio system,
　the first notification, the second point-to-point radio link is used due to an inability comprising link-down of the communication interface, mobile backhaul system of claim 13.
[17.]
　Wherein the first point-to-point radio system, the first results of the channel search and sends to said second point-to-point radio systems or Operation and Maintenance (OAM) system, the first point-to-point radio receiving a second notification that use radio channels to be used in the link from the second point-to-point radio systems or the OAM system, mobile backhaul system according to any one of claims 12 to 16 .
[18.]
　The use radio channels, said determined based first channel search results and to both said second channel search results, mobile backhaul system of claim 17.
[19.]
　Said second point-to-point radio system, the first results of channel search received from the first point-to-point radio system, the use radio channels to be used in the second point-to-point radio links determined based on both the results of the result and said second channel search of the first channel search for mobile backhaul system according to any one of claims 12 to 18.
[20.]
　Said second point-to-point radio system is further used by the first said channel search results and determined based on both of the second channel search result first point-to-point radio links and notifies usage radio channel to the first point-to-point radio system, mobile backhaul system of claim 19.
[21.]
　Wherein the first point-to-point radio system, the second the result of the channel search received from said second point-to-point radio system, using the radio channel to be used by the first point-to-point radio links determined based on both the results of the result and said second channel search of the first channel search for mobile backhaul system according to any one of claims 12 to 16.
[22.]
　Wherein the first point-to-point radio system is further used by the first channel search result and said second of said second point-to-point radio links determined based on both the result of channel search and notifies usage radio channel to the second point-to-point radio system, mobile backhaul system of claim 21.
[23.]
　A communication control method performed by the point-to-point radio system,
　when receiving a first notification that the second point-to-point radio link that is operated by another point-to-point radio system is unavailable in comprises performing the first channel search to search a first point-to-point radio links available free radio channels operated by the point-to-point radio system,
communication control method.
[24.]
　Non-transitory computer readable medium storing a program for causing a communication control method according to the computer to claim 23.