Technical field
[0001]
　Disclosure herein, a communication device in a wireless communication network, a communication system, control method, and communication program.
Background technique
[0002]
　As an example of a cellular communication system, there is a LTE (Long Term Evolution) system. In the LTE system, the base station autonomously adjusted to SON (Self Organizing Network) technology is applied. One SON techniques, in order to level the load of the base station, based on the load information transmitted and received between the base stations, a technique for adjusting the base station parameters defining the coverage has been proposed.
[0003]
　For example, Patent Document 1 compares the load information of the load information and other stations of its own station, when the load of the other station is lower than the own station by narrowing the coverage range of the local station, balancing the load between the base stations how to reduction is disclosed. Here the load information is shown uses described in Non-Patent Document 1. The narrowing the coverage area, for example, is that of lowering the transmission power.
CITATION
Patent Document
[0004]
Patent Document 1: International Publication No. 2011-149083
Non-patent literature
[0005]
Non-patent Document 1: 3GPP TS36.423
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　However, a problem in the method disclosed in Patent Document 1, as a result of narrowing the coverage range of the local station, a terminal to another station of the other station traffic increases by handover, backhaul of the other station is congested there is.
[0007]
　One cause of this problem is the inability to consider the load on the backhaul other stations when changing the load of the own station.
[0008]
　Therefore, one of the objective to be achieved is the embodiment disclosed herein, a base station that operates on the basis of the load on the backhaul other stations when changing the load of the own station, the method and program it is to provide.
Means for Solving the Problems
[0009]
　The base station of this embodiment,
a first backhaul between the core network to be connected to the own station and the own station, between the core network connecting the neighbor base station and the adjacent base station second in a communication system comprising a backhaul,
a calculating unit for calculating the load on the second backhaul of changing the load of the own station, based on the calculation result of the calculating section, change the load of the own station It has a determination unit that determines whether a.
[0010]
　Communication system of the present embodiment,
a first backhaul between the core network to be connected to the own station and the own station, between the core network connecting the neighbor base station and the adjacent base station second and backhaul in a communication system comprising a terminal communicating with the mobile station,
the base station,
a calculation unit for calculating the load on the second backhaul of changing the load of the own station, the calculation unit based on the calculation result, the anda determination unit that determines whether to change the load of the own station,
the terminal may
receive the information obtained based on the results of determination of the base station.
[0011]
　The method for a base station of this embodiment,
between the core network connecting a first backhaul between the core network to be connected to the own station and the own station, and neighbor base station and the neighbor base station in the second communication system comprising a backhaul,
a step of calculating the load on the second backhaul of changing the load of the own station,
based on the calculation result of the calculating section, of the own station and determining whether to change the load,
having a.
[0012]
　Programs of this embodiment,
a first backhaul between the core network to be connected to the own station and the own station, the second back between the adjacent base stations core network connected to said adjacent base station in a communication system comprising a hole,
a step of calculating the load on the second backhaul of changing the load of the own station,
or based on the calculation result of the calculating unit changes the load of the own station determining a whether,
it causes the computer to execute.
Effect of the Invention
[0013]
　According to the above-described embodiment, it is possible to perform the operation based on the load on the backhaul other stations when changing the load of the own station.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014]
FIG. 1 is a block diagram of a wireless communication system according to the first embodiment.
FIG. 2 is a block diagram of a base station according to the first embodiment.
3 is a flowchart of the operation of the base station according to the first embodiment.
4 is a block diagram of a base station according to the second embodiment.
5 is a flowchart of the operation of the base station according to the second embodiment.
6 is a block diagram of a base station according to the third embodiment.
7 is a flowchart of the operation of the base station according to the third embodiment.
8 is a block diagram showing an example of a backhaul composed of a plurality of links according to the third embodiment.
9 is a block diagram of a communication system according to a modification of the third embodiment.
FIG. 10 is a block diagram of a communication system of the fourth embodiment.
11 is a block diagram of a base station according to the fourth embodiment.
12 is a block diagram of a management control system according to the fourth embodiment.
13 is a flowchart of the operation of the management control system according to the fourth embodiment.
14 is a diagram showing an example of load information of each link.
[15] The management controller is a sequence diagram of an operation for transmitting the load information of the bottleneck link in the base station.
[16] The management controller is an example of information to be transmitted to the base station.
17 is a flowchart of the operation of the base station according to the fourth embodiment.
It is a sequence diagram showing the resource status notification processing between FIG. 18 base stations.
19 is an explanatory view showing a structure of a resource status request message.
FIG. 20 is an explanatory view showing a structure of a resource status update messages.
[21] The base station S1 TNL Load received from the adjacent base station is an example of converting to a percentage value.
FIG. 22 is an example of a communication system.
FIG. 23 is a block diagram of a terminal 500 according to the embodiments.
DESCRIPTION OF THE INVENTION
[0015]
　Hereinafter, specific embodiments will be described in detail with reference to the 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.
[0016]
　A plurality of embodiments described below can can either be carried out independently, also be implemented in appropriate combination. These several embodiments have different novel features together. Accordingly, the plurality of embodiments, contribute to solving the different purpose or task to each other, which contributes to achieve different effects from each other.
[0017]
　
　FIG 1 shows a configuration example of a wireless communication system according to this embodiment. The wireless communication systems provide communication services, both for example, voice communication or packet data communication, or these. Referring to FIG. 1, the wireless communication system includes a base station 100, neighbor base station 101, core network 3, backhaul 4 and backhaul 5. The base station 100 is connected to a core network 3 via the backhaul 4. Furthermore, the neighboring base station 101 is connected to a core network 3 via the backhaul 5.
[0018]
　Here neighboring base station 101, it may refer to a base station adjacent to the base station 100. Base station 100 and neighbor base station 101, for example, may be connected by an interface such as X2 interface. Further, for example, base station 100 and the neighboring base station 101, respectively, a macrocell base station and the femto cell base station, femto cell base station in the communication area which the macrocell base station forms are arranged, heterogeneous network (Heterogeneous Network ) and it may not constitute a network called.
[0019]
　Figure 2 shows an example of the configuration of a base station 100 in the first embodiment.
[0020]
　The base station 100 includes at least a calculating unit 10 and the determining unit 20.
[0021]
　Calculator 10 calculates the load on the backhaul 5 connecting of changing the load of the base station 100, neighbor base station 101 and the core network 3.
[0022]
　Determining unit 20, whether to change the load of the base station 100 is determined based on the calculation result of the calculating section.
[0023]
　Next, operation of the base station 100 of this embodiment will be described with reference to FIG.
[0024]
　In step S10, calculation unit 10 calculates of changing the load of the base station 100, the load on the backhaul 5.
[0025]
　In step S11, determination unit 20, whether to change the load of the base station 100 is determined based on the calculation result of the calculating section.
[0026]
　As described above, the base station 100 in the present embodiment, when changing the load of the base station 100 calculates the load on the backhaul 5, whether or not to change the load of the base station 100, calculator determined based on the calculation result. Therefore, according to the base station 100 in the present embodiment, operation can be performed based on the load on the other stations backhaul of changing the load of the own station (the base station 100), there is an effect that.
[0027]
　
　In the present embodiment, a description will be given of modifications of the first embodiment described above.
[0028]
　Figure 4 shows an example of a configuration of a base station 200 in the second embodiment.
[0029]
　The base station 200 includes calculating unit 10, a determination unit 21 and the changing portion 30 at least. Calculator 10 is the same as the first embodiment.
[0030]
　Determining unit 21, whether to change the load of the base station 200 is determined based on the calculation result of the calculating section.
[0031]
　Changing unit 30, based on the determination result of the determination unit changes the load of the base station 200.
[0032]
　Here, to change the load, for example, changing the position of the size and coverage area of ​​coverage range (position of the coverage range indexed from latitude information and longitude information), to change the number of terminals communicating with the base station including that. It means for changing the position of the size and coverage area of ​​coverage ranges include changing the transmission power of the base station and, or changing the antenna tilt angle and azimuth, various means such as performing a beam form. Further, it means for changing the number of terminals communicating with the base station includes various means such as that for handover the terminal to another base station.
[0033]
　Next, the operation of the base station 200 of this embodiment will be described with reference to FIG.
[0034]
　Step S20 is similar to step S10 in the first embodiment.
[0035]
　In step S21, determination unit 21, whether to change the load of the base station 200 is determined based on the calculation result of the calculating section. Determination result of step S21 is to indicate that the "do not change the load of the base station 200" (Step S21: NO), step S22 and subsequent operations are not performed, the operation ends. Thus, whether or not to change the load of the base station 200, to determine on the basis of the calculation of the calculation unit results in changing unit 30 which operates only when it is necessary to change the load of the base station 200 Become. Thus, power saving and load reduction of the base station 200 itself of the base station 200 becomes possible.
[0036]
　Determination result of step S21 is to indicate that the "changing the load of the base station 200" (step S21: YES), in step S22, the changing unit 30 changes the load on the base station 200.
[0037]
　In step S22, the changing unit 30 based on the determination result of step S21, it changes the load of the base station 200.
[0038]
　As described above, the base station 200 in the present embodiment, based on the determined result of the determining unit 21, changes the load of the base station 200. Therefore, according to the base station 200 in the present embodiment, based on the determined result of the determining unit 21 can change the load of the base station 200.
[0039]
　
　In the present embodiment, a description will be given of variations of the first or second embodiment described above.
[0040]
　Figure 6 shows an example of the configuration of a base station 300 in the third embodiment.
[0041]
　The base station 300 includes calculating unit 10, determination unit 21, the changing unit 30, the determination section 40 at least. The calculation unit 10, determining section 21 and the changing portion 30 is the same as the second embodiment.
[0042]
　Determination section 40 includes a first determination unit 41 may have one or both of the second determination portion 42 or the third judging section 43.
[0043]
　The first determination unit 41, the base station 100 in FIG. 1 (hereinafter, in the present embodiment is referred to as a base station 300 to have a function of the base station 300) resources to determine whether or not congested.
[0044]
　Second determination unit 42, based on the load information in the backhaul 4 connecting base station 300 and the core network 3, backhaul 4 determines whether or not congested.
[0045]
　The third determination unit 43, based on the load information in the backhaul 5 for connecting the adjacent base station 101 and the core network 3 in FIG. 1, the backhaul 5 determines whether congested.
[0046]
　Next, operation of the base station 300 of this embodiment will be described with reference to FIG. Here, mainly described focusing on differences from the foregoing embodiment.
[0047]
　In step S30, the first determination unit 41, the resource of the base station 300 determines whether or not congested. Determination in step S30, indicating that "the resource of the base station 300 is not congested" (step S30: NO), the process proceeds to step S31. On the other hand, the determination in step S30, indicating that "the resource of the base station 300 is congested" (step S30: YES), the process proceeds to step S32.
[0048]
　In step S31, the second determination unit 42, based on the load information in the backhaul 4 connecting base station 300 and the core network 3, backhaul 4 determines whether or not congested. Determination in step S31, indicating that "backhaul 4 is not congested" (Step S31: NO), step S32 and subsequent operations are not performed, the operation ends. Thus, to operate on the basis of whether or not the determination result backhaul 4 is congested connecting the base station 300 and the core network 3, the calculation unit 10 will operate only when calculated required. Thus, power saving and load reduction of the base station 300 itself of the base station 300 becomes possible.
[0049]
　Then, the judgment result in the step S31, indicating that "backhaul 4 is congested" (Step S31: YES), the process proceeds to step S32.
[0050]
　In step S32, the third determination unit 43 based on the load information in the backhaul 5 for connecting the adjacent base station 101 and the core network 3, backhaul 5 determines whether congested. Determination in step S32 is, which indicates that the "congested backhaul 5" (step S32: YES), step S33 and subsequent operations are not performed, the operation ends. Thus, to operate on the basis of whether or not the determination result backhaul 5 for connecting the adjacent base station 101 and the core network 3 is congested, calculation unit 10 will operate only when calculated required . Thus, power saving and load reduction of the base station 300 itself of the base station 300 becomes possible.
[0051]
　Then, the determination result of step S32 is to indicate that the "backhaul 5 is not congested" (step S32: NO), calculation unit 10 performs the operation in step S33. Note that step S33, step S34 and step S35 are the same as in the first embodiment and the second embodiment.
[0052]
　Incidentally, the present embodiment, the backhaul between the base station and the core network may also be applied to a case composed of a plurality of links.
[0053]
　Figure 8 is a block diagram showing an example of a backhaul composed of a plurality of links. As shown in FIG. 8, the backhaul composed of a plurality of links, the access links, and aggregation link can be divided into a Metrolink. Access link is the link to accommodate the installed base stations in the access area. Aggregation link includes a plurality of base stations of the access area, and a link to accommodate the installed base stations in the aggregation area. Metrolink is a link in the metro area, a link for transferring a plurality of data traffic of the base station to be transferred from the aggregation link to the core network.
[0054]
　Figure 9 is a block diagram showing an example of a communication system according to a modification of this embodiment.
[0055]
　In the communication system shown in FIG. 9, the base stations 300-320 via links 301-305, repeater 330-340, it is connected to a core network 350. Base station 300 and base station 310 is connected to the relay device 330. The base station 320 is connected to the relay apparatus 340. The relay device 330-340 is connected to a core network 350. Base station 300 and base station 310, base station 310 and base station 320 is connected by X2 interfaces. Terminal 360 is to be located in the cell 380 of base station 310.
[0056]
　Link 304 has aggregated link 301 and link 302. Therefore, the link 304, traffic may flow from both links 301 and link 302.
[0057]
　Second determining section 42 and the third judging section 43, if the backhaul is composed of a plurality of links may be used load information in the busiest link in backhaul connecting the base station and a core network . Specifically, if, in the backhaul between the base station 300 and core network 350, a load of the link 304 compared to the link 301 is high. In this case, the load information where the second judgment unit 42 uses the determination in the present embodiment may be a load information in the link 304.
[0058]
　In the communication system or the base station 300 in this embodiment, not only the resource of the base station 300 is congested, whether back holes connecting the local station and the core network is congested and, adjacent base stations and the core based on whether the back holes connecting the network is congested, it can be determined whether to change the load of the own station. That is, when to change the load of the own station is judged accurately, it is possible to change only the load when the load change of the station is necessary. Therefore, it is possible to achieve power saving of the base station 300.
[0059]
　In the communication system or the base station 300 in the present embodiment, it is possible to solve the following problem. For example, if the backhaul base station 300 is congested, the so packets arriving at the base station 300 is small PRB (Physical Resource Block) usage is low and the cell of the base station 300 (cell 370 in FIG. 9) throughput of terminals serving can become low. At that time, the base station 300, since PRB use rate of the own station (the base station 300) is not high, it does not change the transmission power of the own station. Therefore, improving the throughput of terminals located in the cell 370 will not be performed.
[0060]
　Problem described above occurs, for example, when a aggregation link of the base station 300 (link 304 in FIG. 9) and the access link of the base station 300 (link 301 in FIG. 9) is congested.
[0061]
　To the above-described problems, the base station 300 in the present embodiment, even if the resources of the base station 300 is not congested, based on whether the back holes connecting the local station and the core network is congested, its own station it is possible to determine whether to change the load. Therefore, it is possible to properly eliminate the congestion of the resource of the local station. Moreover, since it becomes possible to appropriately move the terminal to communicate with the local station, thereby eliminating congestion resources of its own station, and it is possible to eliminate the congestion of the backhaul of the local station.
[0062]
　
　In the present embodiment, a description will be given of modifications of the first to third embodiments described above.
[0063]
　Figure 10 is a block diagram showing an example of a communication system of the present embodiment.
[0064]
　In the communication system shown in FIG. 10, the base stations 400-410 are links 421-427, via the relay apparatus 430 to 470 are connected to a core network 480. Between the base station 400 and core network 480 is connected by a link 421,423,425 and 427. Between the base station 410 and core network 480 is connected by a link 422, 424 and 426 and 427. Further, the management control unit 490 which manages the backhaul resources, the interface between the management controller 490 each relay device management control unit 490 may be any interface that can acquire load information of each link 421-427. The interface between the management controller 490 and the base station 400 and the management controller 490 and the base station 410, base station 400, base station 410 may be any interface that can receive the load information in the backhaul. The management control unit 490, for example, NMS (Network Managment System).
[0065]
　Figure 11 shows an example of the configuration of a base station 400 according to the fourth embodiment.
[0066]
　The base station 400 includes calculating unit 10, determination unit 21, the changing unit 30, determination unit 40, a communication unit 50 and the control unit 60 at least. Calculator 10 includes a radio quality calculation unit 11, the terminal number calculator 12, the communication quality calculation unit 13 and the load information calculation section 14 at least. Incidentally, the changing unit 30 and the determination unit 40 is similar to the third embodiment.
[0067]
　Radio quality calculation unit 11 uses the information about the radio quality reported from the terminals connected to the local station (the base station 400), and calculates the information relating to radio quality of a terminal in the case of changing the load of the station .
[0068]
　Terminal number calculator 12 calculates the information on the number of terminals that communicate with its own station and the adjacent base station when you change the load of the own station.
[0069]
　Communication quality calculation unit 13 calculates the information relating to the throughput of each terminal in the case of changing the load of the own station.
[0070]
　Load information calculator 14 calculates the information relating to backhaul load of the own station and the adjacent base station when you change the load of the own station.
[0071]
　Determining unit 21, the load information of the bottleneck link of the adjacent base stations of changing the load of the own station based on whether exceeds a predetermined value, determining whether to change the load of the station .
[0072]
　The communication unit 50 is connected with an external device by wire or wirelessly, with an external device, transmits or receives various information. In the present embodiment, it receives the information about the load in busiest link in backhaul connecting the base station and the core network from the management control unit 490.
[0073]
　Control unit 60 controls the components respectively included in the base station 400.
[0074]
　Figure 12 shows an example of the configuration of a management control device 490 in the fourth embodiment.
[0075]
　Management control device 490 includes a relay apparatus communication unit 491, the load information computing section 492, a base station communication unit 493 and the database unit 494 at least.
[0076]
　Repeater communication unit 491 receives the load information of each link from the relay device connected to the management controller 490 (relay devices 430 to 470 in FIG. 10). An example of a unit of the load information, the bit rate (bps, Mbps) and the number of bytes transferred per unit time (MB, GB), and the like.
[0077]
　Load information computing unit 492 normalizes the percentage values ​​for the physical speed of the link load information of each link. Then, the load information computing unit 492, extracts based on the load information obtained by normalizing, for each base station, busiest link between the base station and the core network 480, i.e. the bottleneck link (Bottleneck Link) to.
[0078]
　Base station communication unit 493 transmits the load information and the base station of the bottleneck link extracted for each base station load information in first hop link to the base station.
[0079]
　Database unit 494 by the relay apparatus communication unit 491 and the base station communication unit 493, load information on each link to the base station is updated from time to time mapping information between the base station and the core network 480 for each link.
[0080]
　Next, the management control unit 490 of the present embodiment collects the load information of each link to the base station, the operation up to extracting the bottleneck link will be described with reference to FIG. 13.
[0081]
　In step S101, the management control unit 490 collects the load information of each link (link 421-427 in FIG. 10).
[0082]
　In step S102, normalized to percentage values ​​for the physical speed of the link load information of each link. Figure 14 is a diagram showing an example of load information of each link between the base station 400 and between the base station 410 and core network 480 and core network 480. Each value shown in FIG. 14 is a load information normalized to a percentage value.
[0083]
　In step S103, the highest link value indicated by the load information normalized to determine the bottleneck link. In this case, the load information computing unit 492, instead of all links between the base station and the core network 480, the busiest link in each link from the base station to the N-th hop (N is an integer value) it may be extracted as a bottleneck link.
[0084]
　For example, the load information computing unit 492, from the base station to narrow link each link, also for example, a relatively congested easily link backhaul network from the base station to SeGW as the entrance of the operator network (Security Gateway) each link, most load may extract the high link as a bottleneck link in the. For example, the load information computing unit 492, the access area, the most loaded in each link in the aggregation region may be extracted a high link.
[0085]
　Figure 15 is a sequence diagram showing an operation management control device 490 sends the load information of the bottleneck link in the base station 400. At this time, also transmit load information of the links 1 hop away from the base station. Figure 16 shows an example of information management control unit 490 transmits to the base station 400. In Figure 16, a bottleneck link, the load information of the links 1 hop away from the base station, it is displayed in Mbps and percentage.
[0086]
　Next, operation of the base station 400 of this embodiment will be described with reference to FIG. 17.
[0087]
　At step S40, determination unit 40, the resource of its own station (the base station 400 in FIG. 10) is equal to or is congested. Determination in step S40 is, indicating that "the resource of its own station is not congested" (Step S40: NO), the process proceeds to step S42. On the other hand, the determination in step S40 is, indicating that "the resource of its own station is congested" (step S40: YES), the process proceeds to step S41.
[0088]
　In step S41, determination unit 40 further, if the value of the load information of the bottleneck link of its own station exceeds the predetermined value (step S41: YES), the backhaul base station 400 is congested considers, perform the following operation (step S42). Does not exceed the predetermined value (step S41: NO), step S42 and subsequent operations are not performed, the operation ends.
[0089]
　In step S42, determination unit 40 further, if the value of the load information of the bottleneck link of the neighboring base stations 410 of the base station 400 does not exceed the predetermined threshold value (step S42: NO), the back of the neighboring base stations 410 regarded as the hole is not congested, it performs the following operation (step S43). If more than a predetermined value (step S42: YES), step S43 and subsequent operations are not performed, the operation ends.
[0090]
　At step S43, the radio quality calculation unit 11 instructs the measurement and reporting of the radio quality to the terminal. Here, the radio quality is, for example, RSRP (Reference Signal Received Power). Furthermore the radio quality calculation unit 11 uses the information about the radio quality terminal to measure and report to calculate the information about the radio quality of a terminal in the case of changing the load of the own station.
[0091]
　At step S44, the terminal number calculator 12, by using the load information of the links 1 hop away from the adjacent base station 410, to predict the number of terminals connected to the neighboring base station 410. Here, the terminal number calculator 12, terminals connected to each base station is assumed to transmit and receive data average the same amount. That is, it is assumed that the average execution number of active terminals is proportional to the load on the link first hop from the base station. Here, the average effective number of active terminals and refers to the average number of active terminals except the number of hours active terminals is zero when calculating the average number of active terminals. For example, the average number of execution active terminals is a predetermined time interval (e.g., 1 second intervals) the number of active terminals of the measured cell to a predetermined period (e.g., 15 minutes) shows an averaged value for. The average number of active terminals is defined by 3GPP TS36.314 ver11.1.0 as Layer 2 Measurements in the radio base station.
[0092]
　For example, ten devices in the own station are connected, the load of the link first hop from the own station is 100Mbps, and the load of the link first hop from the adjacent base station 410 is 20Mbps and shows. Terminal number calculating section 12, since the load of the link first hop from the adjacent base station 410 is 0.2 times the load of a link first hop from the own station is connected to the adjacent base station 410 the number of terminals is also predicted to be 0.2 times the number of terminals connected to the own station (the number of terminals connected to the neighboring base station 410 is a two).
[0093]
　In step S45, the communication quality calculation unit 13 calculates the information relating to the throughput of each terminal of the own station when changing the load of the own station. Specifically, the calculation result of the radio quality of a terminal according to the radio quality calculation unit 11, based on the calculation result of the average number of execution active terminals of each cell by the terminal number calculator 12 calculates the communication quality of the terminal. The communication quality of the terminal, for example, throughput and the like. Here, the communication quality calculation unit 13, before changing the load of its own station may be calculated also the throughput of the terminal connected to the neighboring base station.
[0094]
　In step S46, the load information calculator 14 calculates the load information of the bottleneck link of the own station and the adjacent base station when you change the load of the own station. Specifically, the communication quality of the terminal that the communication quality calculating unit 13 is calculated in step S13, and calculates the load on the neighboring base station when you change the load of the own station.
[0095]
　At step S47, the calculated in step S46, if the load information of the bottleneck link of the adjacent base stations of changing the load of the own station does not exceed the predetermined value (step S47: YES), the next processing (step S48) to run. If more than a predetermined value (Step S47: NO), step S48 and subsequent operations are not performed, the operation ends. Thus, since the load information of the bottleneck link of the adjacent base stations of changing the load of the own station to operate on the basis of whether or not it exceeds a predetermined value, changing unit 30 only when calculated required It will operate. Thus, power saving and base station 400, it becomes possible to reduce the moving unnecessary to neighboring base stations 410 of the terminal.
[0096]
　In step S48, the changing section 30, based on the determination result of the determining unit 21, changes the load of the base station 400.
[0097]
　The base station 400, load information of the bottleneck link of the own station when you change the load of the station may operate on the basis of whether or not it exceeds a predetermined value. Specifically, when the load information of the bottleneck link of the own station when changing the load of the own station is equal to or less than the predetermined value, the bottleneck link of the own station by changing the load of the station considers that there is a likelihood of congestion is eliminated, it may change the load of the own station.
[0098]
　Further, the base station 400, rather than the bottleneck link and the first hop of the management control device load information of the link 490 shown in FIG. 16, may be received from the adjacent base station 410. In this case, via the X2 links between base stations, Resource Status Reporting described in the resource status notification process, specifically 3GPP (3rd Generation Partnership Project) technical specifications (TS36.423 Version11.5.0) Initiation Procedure to run.
[0099]
　Figure 18 is a sequence diagram showing the resource status notification processing between the base stations. In the resource status notification process, as shown in FIG. 18, the base station 400, to the adjacent base station 410, resource status request message (X2: RESOURCE STATUS REQUEST message) is transmitted. Then, the base station 400 from the adjacent base station 410, in response to the resource status request message message (X2: RESOURCE STATUS RESPONSE message) is transmitted.
[0100]
　Figure 19 is an explanatory view showing a structure of a resource status request message. The base station 400 is in the resource status request messages and the load information of the neighbor base stations 410 that has established an X2 link as measured. Specifically, the base station 400, as shown in FIG. 19, the parameter "Report Characteristics (measured item)" of resource status request messages and the "TNL (Transport Network Layer) load Ind Periodic". Thereby, the base station 400, it is possible to periodically receive the load information of the neighbor base stations 410. Incidentally, it is possible to specify up to four load information in "Report Characteristics". One of them, include "TNL load Ind Periodic".
[0101]
　Then, the base station 400, the resource status update messages from the neighboring base station 410 (X2: RESOURCE STATUS UPDATE message) receives a.
[0102]
　Figure 20 is an explanatory view showing a structure of a resource status update messages. The resource status update message the base station 400 receives, contains "S1 TNL Load Indicator" as shown in FIG. 20. "S1 TNL Load Indicator" is, S1 load information of the transport network layer (hereinafter, S1 that the network load information) is. S1 network load information, the link between the first hop relay apparatus from the base station and the base station, i.e. shows a backhaul resource load of the access link.
[0103]
　In this embodiment, the base station 400 to the neighboring base station 410 X2: send a RESOURCE STATUS RESPONSE message, the neighboring base station 410 X2: receiving the RESOURCE STATUS UPDATE message. Therefore, the base station 400 is enabled to obtain the S1 TNL Load neighbor base station 410.
[0104]
　Figure 21 is an example of the base station 400 S1 TNL Load received from the adjacent base station 410 is converted into a percentage value. The base station 400 converts the S1 TNL Load received from the adjacent base station 410 to a percentage value, starts the operation shown in FIG. 17.
[0105]
　In the communication system or the base station 400 in this embodiment, it is possible to solve the following problems.
[0106]
　Figure 22 is an example of a communication system. For example, since the traffic data of terminals located in the cell 403 is large, if the congested the aggregation link base station 410 and base station 420 (link 4040), since fewer packets arriving at the base station 410 throughput terminals PRB usage is located in low and cell 402 may be low. However, when viewed from the base station 400, as because not high PRB use rate of the cell 402, estimated to be not much number of radio terminals that are in the cell 402, moving the terminal 404 which is temporarily located in the cell 401 also, the throughput of terminals located in the terminal 404 and the remaining cells 401 that has moved to the cell 402 is improved lower likelihood, the transmission power of the base station 400. As a result, the terminal 404 that was located in the cell 401 by moving the base station 410, access link and aggregation link base station 410 further congested, the throughput of the terminal 404 that has moved to the base station 410 does not improve .
[0107]
　Problems described above, similarly to the case but congestion in the aggregation link base station 410 and base station 420 (link 22 4040) points out the case arising, the access link, that link 4010 of the base station 410 is congested problems occur.
[0108]
　To problems described above, according to the base station 400 in this embodiment, assuming the congestion status of the backhaul in the adjacent base station 410 in the case where a terminal connected to the base station 400 moves to a neighboring base station 410 above, it can be determined whether to move the terminal. Therefore, unnecessary movement of the terminal is reduced, the signaling is also reduced with the movement of the terminal (handover, etc.). It is also possible to prevent the change of the unnecessary transmission power of the base station 400. Therefore, the base station 400, it is possible to reduce the burden across neighboring base stations 410 and the communication system.
[0109]
　Further, it is possible to solve the following problem. For example, and high PRB use rate of the cell 401, the link of the neighbor cell 402 4010, link 4040 if not congested, the base station 400 is within the area covered by the terminal 404 and the remaining cells 401 that has moved to the cell 402 expected the throughput have the terminal is improved, by reducing the transmission power of the base station 400, the terminal 404 moves into the cell 402. However, by the terminal 404 is located in the cell 402, link 4010, traffic links 4040 increases. Links 4010, by traffic links 4040 increases, there is a possibility that the link aggregation link 4040 is congested. If the link 4040 is congested, the throughput of the terminal 404 that has moved to cell 402 not be improved, and also cause degradation of the throughput of the terminal that was originally located in the cell 402.
[0110]
　Problem described above, by the terminal 404 is located in the cell 402, but points out when congestion link 4040 aggregation link base station 410 occurs, the access link, that link 4010 of the base station 410 is congested similar problems even in the case occurs.
[0111]
　To problems described above, according to the base station 400 in this embodiment, assuming the congestion status of the backhaul in the adjacent base station 410 in the case where a terminal connected to the base station 400 moves to a neighboring base station 410 above, it can be determined whether to move the terminal. Therefore, unnecessary movement of the terminal is reduced, the signaling is also reduced with the movement of the terminal (handover, etc.). It is also possible to prevent the change of the unnecessary transmission power of the base station 400. Therefore, the base station 400, it is possible to reduce the burden across neighboring base stations 410 and the communication system.
[0112]
　Note that the configuration of the calculating unit 10 in FIG. 11 of the above-described embodiments may be incorporated into the control unit. The control device, for example, MME (Mobility Management Entity), EMS (Element Management System), may be a device such as a HeNB-GW (Home evolved Node B Gate Way). If calculating unit 10 is incorporated in these control devices, the calculating unit 10 may be configured to notify the calculated result to the base station.
[0113]
　Further, in the embodiment described above, the management control unit 490 but is transmitting load information of the links 1 hop away from the load information and the base station of the bottleneck link in the base station 400, management control device the load information 490 may also be transmitted to the control device.
[0114]
　Further, instead of the load information in the backhaul between the base station and the core network, intermediate apparatus from the base station to the core network (routers, switches, etc.) load information (hardware utilization, CP usage, memory usage etc.) may be used.
[0115]
　Each process in the above embodiments may be executed by software. That is, the computer program for performing each processing is read by a CPU (Central Processing Unit) is included in the communication device may be performed. Even if the processes using the program, it is possible to perform the processing of the same content as the processing of the embodiments described above. Then, the above 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 include with various types of entities (tangible storage medium). Examples of non-transitory computer readable media include magnetic storage media (such as floppy disks, magnetic tape, hard disk drive), magneto-optical recording medium (e.g. optical disk), CD-ROM (Read Only Memory) CD-R, CD -R / W, a semiconductor memory (e.g., a mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access memory)) includes a. The program may be provided to a computer using a temporary 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, wired communication path such as electrical wires and optical fibers, or via a wireless communication path can provide the program to a computer.
[0116]
　According the process of the embodiments described above, the terminal may perform handover. Figure 23 shows an example of the configuration of the terminal 500 in each embodiment.
[0117]
　Terminal 500 includes a communication unit 501 and the control unit 502 at least. The communication unit 501 is connected with an external device by wire or wirelessly, with an external device, transmits or receives various information. The communication unit 501 may receive information from each component of the base station in each embodiment. Control unit 502 controls the components included in the terminal 500.
[0118]
　Furthermore, some or all of the above embodiments, can be described as the following notes, not limited to the following.
[0119]
　Further, the term cell as used herein and in the appended claims, time to time, means a coverage area or sector, or a combination of these base stations or base station.
[0120]
　Furthermore, the term base station as used herein and in the appended claims, time to time, eNB (evolved Node B), HeNB (Home evolved Node B) or other information processing device or means a combination of these to.
[0121]
　Although the present invention has been described with reference to the embodiments, the present invention is not limited by the foregoing. Configuration and details of the present invention, it is possible to make various modifications that those skilled in the art can understand within the scope of the invention. For example, some or all of the above embodiments, can be described as the following notes, not limited to the following.
[0122]
　(Supplementary Note 1)
a first backhaul between the core network connecting the local station and the own station, and a second backhaul between the core network to be connected to the the adjacent base station neighbor base station in a communication system comprising,
a calculating unit for calculating the load on the second backhaul of changing the load of the own station,
based on the calculation result of the calculating unit, whether or not to change the load of the own station a determination unit that determines a
base station having a.
[0123]
　(Supplementary Note 2)
has a changing unit for changing the load of the own station based on the determination, the base station according to Appendix 1.
[0124]
　(Supplementary Note 3)
changing the load of the own station by changing the coverage area of its own station, the base station according to Appendix 2.
[0125]
　(Supplementary Note 4)
The load of the own station is the load in the first backhaul base station according to any one of Appendices 1 to 3.
[0126]
　(Supplementary Note 5)
based on the first information about the busiest link in the first backhaul,
has a first determining section for determining whether the first backhaul is congested, the based on the determination result of the determination unit, it determines whether to execute the calculation, the base station according to Appendix 4.
[0127]
　(Supplementary Note 6)
based on the second information on busiest link in said second backhaul, has a second determination unit that the second backhaul determines whether congested,
the based on the determination result of the determination unit, it determines whether to execute the calculation, the base station according to Appendix 4 or 5.
[0128]
　(Supplementary Note 7)
based on the third information relating to backhaul load in the backhaul link first hop from the own station, and calculates the information on the number of terminals that communicate with the local station of changing the load of the self station the base station according to Appendix 6.
[0129]
　(Supplementary Note 8)
The base station according to note 7 to calculate the information about the radio quality of a terminal in the case of changing the load of the own station.
[0130]
　(Supplementary Note 9)
The base station according to note 8 based on the number information and the radio quality information on regarding the terminal, to calculate the information about the throughput of a terminal in the case of changing the load of the own station.
[0131]
　(Supplementary Note 10)
on the basis of the information about the throughput of the terminal, the base station according to Note 9 to calculate the first load.
[0132]
　This application claims priority based on Japanese Patent Application No. 2014-172116, filed on August 27, 2014, the entire disclosure of which is incorporated herein.
DESCRIPTION OF SYMBOLS
[0133]
　3,350,480 Core Network
　4,5,301 ~ 305,421 ~ 427,4000,4010,4020,4030,4040 links in the backhaul
　10 calculating unit
　11 radio quality calculation unit
　12 the terminal number calculator
　13 communication quality calculating unit
　14 load information calculating unit
　20 determination unit
　30 change unit
　40 determination unit
　41 first determination unit
　42 second determination portion
　50,601 communication unit
　60,602 controller
　100,200,300,310,320,400,410, 420 base station
　101 neighboring base station
　330 to 340,430,440 repeater
　360,404,600 terminals
　370 ~ 390,401 ~ 403 cells
　490 management control unit
　491 relay device communication unit
　492 load information computing unit
　493 base station communication unit
　494 database unit

The scope of the claims
[Claim 1]
　Communication system comprising a first backhaul between the core network to be connected to the own station and the own station, and a second backhaul between the core network to be connected to the the adjacent base station neighbor base station in,
　a calculating means for calculating the load on the second backhaul of changing the load of the own station,
　based on the calculation result of the calculating means, for determining whether to change the load of the own station determined and means,
　the base station having.
[Claim 2]
　Having a changing means for changing the load of the own station based on the determination, the base station according to claim 1.
[Claim 3]
　Changing the load of the own station by changing the coverage area of ​​its own station, the base station according to claim 2.
[Claim 4]
　The base station according to the load of its own station is the load in the first backhaul any one of claims 1 to 3.
[Claim 5]
　Based on the first information about the busiest link in the first backhaul has a first determining means for determining whether the first backhaul is congested,
　the first determination based on the unit of the determination result, it determines whether to execute the calculation, the base station according to claim 4.
[Claim 6]
　Wherein for the second busiest link in backhaul based on the second information includes a second determination unit that the second backhaul determines whether congested,
　the second determination based on the unit of the determination result, it determines whether to execute the calculation, the base station according to claim 4 or 5.
[Claim 7]
　It said determining means determines the load information of the bottleneck link in the second backhaul of changing the load of the own station does not exceed a predetermined value, changes the load of the own station, claim the base station according to any one of 1 to 6.
[8.]
　First backhaul and a communication system comprising a second backhaul between the core network to be connected to the the adjacent base stations neighboring the base station between the core network connecting the base station and the base station in,
　the base station,
　a calculation means for calculating the load on the second backhaul of changing the load of the own station,
　or based on the calculation result of the calculating means changes the load of the own station judges a determining means for determining, a
　terminal
　receives the information obtained based on the results of determination of the base station, communication system.
[Claim 9]
　Communication system comprising a first backhaul between the core network to be connected to the own station and the own station, and a second backhaul between the core network to be connected to the the adjacent base station neighbor base station in,
　calculates the load on the second backhaul of changing the load of the own station,
　based on the result of the calculation, the determining whether to change the load of the own station,
　for base station Method.
[Claim 10]
　Communication system comprising a first backhaul between the core network to be connected to the own station and the own station, and a second backhaul between the core network to be connected to the the adjacent base station neighbor base station in,
　calculates the load on the second backhaul of changing the load of the own station,
　based on the result of the calculation, the determining whether to change the load of the own station,
　for base station non-transitory computer readable medium having a program for executing the method of the computer is stored.