WO2014181580A1 - 通信制御装置、通信制御方法及び情報処理装置 - Google Patents
通信制御装置、通信制御方法及び情報処理装置 Download PDFInfo
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- WO2014181580A1 WO2014181580A1 PCT/JP2014/056343 JP2014056343W WO2014181580A1 WO 2014181580 A1 WO2014181580 A1 WO 2014181580A1 JP 2014056343 W JP2014056343 W JP 2014056343W WO 2014181580 A1 WO2014181580 A1 WO 2014181580A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present disclosure relates to a communication control device, a communication control method, and an information processing device.
- TV white space TVWS
- HetNet Heterogeneous Network
- a communication node such as a master WSD (White Space Device) that uses TVWS secondarily or a small cell base station uses a frequency channel.
- a communication node such as a master WSD (White Space Device) that uses TVWS secondarily or a small cell base station uses a frequency channel.
- a first method it is conceivable to use an unused channel.
- a second method while protecting main users such as a primary system (for example, a television broadcasting system) and a macro cell base station by some means, all frequency channels including a used frequency channel are included. It is conceivable to use an appropriate frequency channel.
- a TVWS channel is selected for each time based on channel availability information corresponding to position information for each hour, and wireless communication is performed based on the selected TVWS channel.
- a technique for performing communication is disclosed.
- the frequency channel to be used is used by the main user (primary system, macro cell base station, etc.). Limited to no free channels. Therefore, the communication capacity of the communication node (master WSD, small cell base station, etc.) using the frequency channel can be further reduced. In addition, if a communication node (master WSD, small cell base station, etc.) tries to use a frequency channel used by the main user, it results from the use of the main user who is not controlled. Interference can occur at the communication node. For this reason, the communication quality of the communication node can be degraded.
- Patent Document 1 does not consider interference between a plurality of communication nodes (a plurality of master WSDs, a plurality of small cell base stations, etc.) using a frequency channel. For this reason, in an environment where interference between the plurality of communication nodes may occur, the communication quality of the plurality of communication nodes may be deteriorated.
- an optimization problem related to the combination of the plurality of communication nodes and a plurality of frequency channel candidates may be considered. It is not possible to uniquely find a solution. This necessitates a full search for combinations of a plurality of communication nodes and a plurality of frequency channel candidates. Since the number of combinations increases exponentially according to the number of communication nodes and the number of frequency channel candidates, the amount of calculation can be enormous.
- first interference information indicating first interference from communication involving a communication node that is not the control target
- another communication node to be controlled A communication unit based on the first interference information and the second interference information for the plurality of communication nodes, an acquisition unit that acquires second interference information indicating second interference from communication involving
- a communication control device including a classification unit that classifies the plurality of communication nodes into a plurality of groups related to determination of radio resources that can be used.
- the first interference information indicating the first interference from the communication involving the communication node that is not the control target
- another control target Based on the first interference information and the second interference information for the plurality of communication nodes, acquiring second interference information indicating the second interference from the communication involving the communication node
- a communication control method including classifying the plurality of communication nodes into a plurality of groups related to determination of radio resources available to the nodes.
- an information processing apparatus including a memory that stores a predetermined program and a processor that can execute the predetermined program.
- the predetermined program includes, for each of a plurality of communication nodes to be controlled, first interference information indicating first interference from communication involving a communication node that is not a control target, and another communication node to be controlled Acquiring second interference information indicating second interference from communication involving the communication node, and based on the first interference information and the second interference information for the plurality of communication nodes, the communication node A program for causing the plurality of communication nodes to be classified into a plurality of groups related to determination of available radio resources.
- communication of a communication node that uses a radio resource is improved in an environment where there is interference from communication involving a communication node that is not controlled, with a smaller amount of calculation. It becomes possible to do.
- FIG. 2 is an explanatory diagram illustrating an example of a schematic configuration of a communication system according to an embodiment of the present disclosure.
- 5 is a sequence diagram for describing an example of information flow in a communication system according to an embodiment of the present disclosure.
- FIG. It is explanatory drawing for demonstrating an example of the arrangement
- a communication control process according to the first embodiment will be described. It is a flowchart which shows an example of the schematic flow of the communication control process which concerns on the 1st modification of 1st Embodiment. It is explanatory drawing for demonstrating the example of the communication system operated in another area
- FIG. 1 is an explanatory diagram illustrating an example of a schematic configuration of a communication system 1 according to an embodiment of the present disclosure.
- the communication system 1 includes a master WSD 10, a database (hereinafter referred to as “DB”) 50, and a communication control device 100.
- DB database
- the communication system 1 according to the present embodiment is a secondary system that secondarily uses TVWS, for example.
- the master WSD 10 is a communication node of a secondary system (communication system 1) that secondarily uses a frequency channel for the primary system (television broadcasting system). That is, the master WSD 10 performs radio communication by secondarily using a frequency channel for the primary system (television broadcasting system).
- the master WSD 10 serves as an access point, and the slave WSD 30 accesses the master WSD 10. Then, the master WSD 10 performs wireless communication with the slave WSD 30.
- the master WSD 10 performs wireless communication with the slave WSD 30.
- FIG. 2 is an explanatory diagram for explaining an example of wireless communication by the master WSD 10.
- the master WSD 10 and the communication range 20 of the master WSD 10 are shown.
- the master WSD 10 performs wireless communication with the slave WSD 30.
- the master WSD 10 performs radio communication by secondarily using the frequency channel for the primary system.
- the example shown in FIG. 2 is an example in which the master WSD 10 performs wireless communication with one slave WSD 30, but the master WSD 10 can perform wireless communication with a plurality of slave WSDs 30.
- one or more master WSDs 10 form a set 40 of master WSDs 10.
- the set 40 is, for example, a set of master WSDs 10 that can influence each other.
- the master WSD 10 may adopt TDD (Time Division Duplex) or FDD (Frequency Division Duplex) as the duplex method. That is, the master WSD 10 performs wireless communication by TDD or FDD.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the master WSD 10 or the communication control device 100 assigns the frequency channel to each slave WSD 30.
- the master WSD 10 may assign a frequency channel to each slave WSD 30 and notify the assigned frequency channel to each slave WSD 30.
- the communication control apparatus 100 may assign a frequency channel to each slave WSD 30 and the assigned frequency channel may be notified to each slave WSD 30 via the master WSD 10.
- each master WSD 10 is determined by the communication control device 100, for example.
- the master WSD 10 is connected to the DB 50 and / or the communication control device 100 via, for example, a wired or wireless backhaul line.
- the DB 50 collects and holds various information. For example, the DB 50 collects and holds various pieces of information for determining available frequency channels for each master WSD 10. For example, the DB 50 collects various types of information from the master WSD 10, the communication control device 100, a regulatory database (hereinafter referred to as “regulatory DB”) and / or another communication node.
- the regulatory DB is, for example, a DB owned by a national or regional management organization.
- the DB 50 collects information on the primary system (television broadcasting system). More specifically, for example, the information related to the primary system includes information (eg, number, position, antenna height, transmission power) related to the communication node (transmitting station) of the primary system. Further, the information regarding the primary system includes information regarding frequency channels for the primary system (number of channels, channel bandwidth, center frequency, permissible maximum transmission power, transmission spectrum mask, etc.). Further, the information regarding the primary system includes information regarding a channel that can be used secondarily among the frequency channels for the primary system. For example, the available channels include unused channels that are not used. In addition, for example, the available channels include channels that are used and can be used secondarily on the premise of protection of the primary system.
- the primary system television broadcasting system
- the information related to the primary system includes information (eg, number, position, antenna height, transmission power) related to the communication node (transmitting station) of the primary system.
- the information regarding the primary system includes information regarding frequency channels for the primary system (num
- DB50 may collect the information which shows the interference from the communication in which the communication node of a primary system is concerned about each of master WSD10 as said information regarding a primary system.
- the interference may be actually observed interference, or may be interference calculated as a theoretical value from a path loss or the like.
- the DB 50 collects information related to the primary system in the area under the management of the DB 50 as the information related to the primary system.
- the DB 50 may also collect information on the primary system in another area adjacent to the area under the management of the DB 50 as the above information on the primary system.
- the DB 50 collects the above information related to the primary system from the regulatory DB.
- the DB 50 collects information about the secondary system. More specifically, for example, information on the master WSD 10 of the secondary system (for example, number, position, antenna height, transmission power) is included.
- DB50 may collect the information which shows the interference from the communication which the other master WSD10 concerns about each of the master WSD10 as said information regarding a secondary system.
- the interference may be actually observed interference, or may be interference calculated in advance as a theoretical value from a path loss or the like.
- the DB 50 performs information on the secondary system in the area under the management of the DB 50 as the information on the secondary system.
- the DB 50 may also collect information on the secondary system in another area adjacent to the area under the management of the DB 50 as the above information on the secondary system.
- the DB 50 collects the above information about the secondary system from the master WSD or holds it in advance.
- the DB 50 acquires parameters necessary for referring to interference power.
- the parameters include, for example, adjacent channel leakage ratio (ACLR), adjacent channel selectivity (ACS), shadowing margin, fading margin, and / or protection ratio (PR). Including.
- ACLR adjacent channel leakage ratio
- ACS adjacent channel selectivity
- PR protection ratio
- the DB 50 may collect information on the position of the boundary line between the area under the management of the DB 50 and another area adjacent to the area.
- the DB 50 collects and stores various information.
- the DB 50 Information may be used. Further, the DB 50 may collect and update the information when there is a change in the information already held.
- the communication control apparatus 100 executes various processes related to the control of the master WSD 10.
- the process includes a process related to determination of an available frequency channel for each master WSD 10.
- the communication control apparatus 100 determines an available frequency channel for each master WSD 10 to be controlled. At this time, the communication control apparatus 100 starts from the first interference from the communication involving the communication node that is not controlled (for example, the communication node of the primary system) and the communication involving another master WSD 10 to be controlled. Consider the second interference.
- FIG. 3 is a sequence diagram for describing an example of information flow in the communication system 1 according to the embodiment of the present disclosure.
- the regulatory DB provides information related to the primary system to the DB 50 (S1001).
- the DB 50 notifies the master WSD 10 of information update (S1003). Then, the master WSD 10 provides information necessary for determining available frequency channels to the DB 50 (S1005).
- the DB 50 provides information necessary for determining an available frequency channel to the communication control apparatus 100 (S1007). Then, the communication control apparatus 100 determines an available frequency channel for each master WSD 10 (S1009).
- the communication control apparatus 100 notifies each master WSD 10 of the determined available frequency channel (S1011). Then, each master WSD 10 performs wireless communication using an available frequency channel.
- the communication control apparatus 100 notifies the determined available frequency channel to the DB 50 (S1013). Then, the DB 50 stores available frequency channels for each master WSD.
- FIG. 4 is an explanatory diagram for explaining an example of an arrangement relationship between the primary system and the secondary system.
- the master WSD 10, the slave WSD 30, the DB 50, and the communication control device 100 of the communication system 1 that is a secondary system are illustrated.
- a transmitting station 60 and a receiving terminal 70 of a television broadcasting system that is a primary system are also shown.
- a prohibited area 61 where secondary use of TVWS is prohibited, a protection area 63 for protecting the primary system, and an available area 65 where secondary use of TVWS is allowed are set.
- the master WSD 10 is arranged in the available area 65.
- an available frequency channel for each master WSD 10 is determined.
- specific examples of examples of determining available frequency channels for each master WSD 10 will be described with reference to FIGS. 5 and 6.
- FIG. 5 is an explanatory diagram for describing a first example of determining available frequency channels for each master WSD 10.
- frequency channels f 1 to f 5 for the primary system are shown.
- the frequency channel f 2 is determined as an available frequency channels for the set 40A of the master WSD10.
- the frequency channel f 2 further includes frequency channels f 2A to f 2E .
- the frequency channel f 4 is determined as an available frequency channel for a set 40B of the master WSD10.
- the frequency channel f 4 further includes frequency channels f 4A to f 4E .
- one or more frequency channels among the frequency channels f 4A to f 4E are determined as available frequency channels.
- the available frequency channels for the set 40A and the available frequency channels for the set 40B are separate frequency channels, but these frequency channels have the same frequency. It may be a channel.
- FIG. 6 is an explanatory diagram for describing a second example of determining available frequency channels for each master WSD 10. Referring to FIG. 5, frequency channels f 1 to f 5 for the primary system are shown. In this example, the available frequency channels for each set 40 are not determined, and the available frequency channels for each master WSD 40 are determined directly.
- FIG. 7 is a block diagram showing an example of the configuration of the communication control apparatus 100-1 according to the first embodiment.
- the communication control apparatus 100-1 includes a communication unit 110, a storage unit 120, and a control unit 130.
- the communication unit 110 communicates with other devices. For example, the communication unit 110 communicates with the DB 50 and the master WSD 10.
- the storage unit 120 stores a program and data for the operation of the communication control apparatus 100-1.
- the storage unit 120 stores information acquired from the DB 50.
- the control unit 130 provides various functions of the communication control apparatus 100-1.
- the control unit 130 includes a set determination unit 131, an interference estimation unit 133, an interference information acquisition unit 135, a classification unit 137, and a channel determination unit 139.
- the set determination unit 131 determines the set 40 of the master WSD 10.
- the set 40 is a set of master WSDs 10 that can influence each other.
- the master WSD 10 included in the set 40 may interfere with any other master WSD 10 included in the set 40.
- the set determination unit 131 acquires information (for example, number, position, antenna height, transmission power) regarding each master WSD 10 included in the communication system 1 from the DB 10 via the communication unit 110. Then, the set determination unit 131 determines the set 40 of the master WSD 10 based on the acquired information.
- the set 40 is a set of master WSDs 10 located in the vicinity.
- the set determination unit 131 identifies the master WSD 10 around each master WSD based on the position of each master WSD 10 included in the communication system 1. Then, the set determination unit 131 determines whether or not each master WSD has a large influence on the peripheral master WSD 10. Then, the set determining unit 131 determines the set 40 of the master WSD 10 based on the determination result.
- a set of master WSDs 10 to be determined will be described with reference to FIG.
- FIG. 8 is an explanatory diagram for explaining an example of a set of master WSDs 10 to be determined.
- a plurality of master WSDs 10A that exist in a dense manner are determined as a set 40A.
- another plurality of master WSDs 10B existing in a dense manner are also determined as the set 40B.
- no set is determined for the master WSD 10C.
- the interference estimation unit 133 estimates interference for each of the plurality of master WSDs 10 to be controlled.
- Each of the plurality of master WSDs 10 is the master WSD 10 of the communication system 1 that is a secondary system that secondarily uses a frequency channel for the primary system.
- the plurality of master WSDs 10 are master WSDs 10 included in the same set 40, and the interference estimation unit 133 estimates the interference for each set 40 determined.
- the interference estimation unit 133 performs first communication from communication involving non-controlled communication nodes for each of the plurality of master WSDs 10. Estimate the interference.
- the communication node that is not to be controlled includes a communication node that is not to be controlled by the communication control apparatus 100-1.
- the communication nodes that are not controlled include the communication nodes of the primary system. That is, as an example of an embodiment of the present disclosure, the communication node that is not controlled includes a transmission station of a television broadcasting system.
- the first interference is interference caused by a downlink signal transmitted by the communication node not controlled or an uplink signal transmitted to the communication node not controlled.
- the first interference includes interference due to a downlink signal transmitted by a transmission station of a television broadcasting system.
- the first interference is interference with communication involving the master WSD 10. More specifically, the first interference is interference to uplink communication (transmission from the slave WSD 30 to the master WSD 10) and / or interference to downlink communication (transmission from the master WSD 10 to the slave WSD 30). It is. In other words, the first interference is an interference to an uplink signal (transmit signal of the slave WSD 30) received by the master WSD 10 and / or a downlink signal (transmit signal of the master WSD 10) received by the slave WSD 30. Is an interference.
- the first interference is interference with uplink communication (that is, interference with uplink signals). This can provide greater interference to communications involving the master WSD 10. Moreover, interference can be estimated more easily.
- the master WSD 10 is a communication node of the primary system (of the television broadcasting system) than the slave WSD 30. Receive more interference from the transmitting station). That is, the interference to the uplink communication is larger than the interference to the downlink communication. Therefore, as the first interference, it is possible to obtain a larger interference with the communication involving the master WSD 10 by estimating the interference with the uplink communication.
- the master WSD 10 that receives the uplink signal is less mobile than the slave WSD 30 that receives the downlink signal.
- the position of the slave WSD 30 can change frequently, but the position of the master WSD 10 is fixed. Therefore, it is possible for the master WSD 10 to estimate interference more easily.
- the interference estimation unit 133 estimates the first interference in each of the two or more frequency channel candidates for each of the plurality of master WSDs 10.
- the two or more frequency channel candidates are frequency channels that can be secondarily used by the communication system 1 among the frequency channels for the primary system.
- the interference estimation unit 133 estimates a received power value of an interference signal, for example.
- the power value of interference from communication involving the communication node of the primary system that is, the reception power value of the transmission signal (interference signal) of the transmission station of the television broadcasting system in the master WSD 10.
- n indicates an index of the master WSD 10 to be estimated for interference among the plurality of master WSDs 10.
- f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- the interference estimation unit 133 acquires, for example, information on the primary system, information on the secondary system, parameters necessary for referring to interference power, and the like from the DB 50 via the communication unit 110. Then, the interference estimation unit 133 estimates the first interference based on the acquired information.
- the information related to the primary system includes, for example, information related to the communication node (transmitting station) of the primary system (for example, number, position, antenna height, transmission power) and the like.
- the information related to the secondary system includes, for example, information related to the master WSD 10 of the secondary system (for example, number, position, antenna height, transmission power).
- the interference estimation unit 133 involves another communication node to be controlled for each of the plurality of master WSDs 10 to be controlled. Estimate a second interference from the communication.
- the other communication node to be controlled is a communication node to be controlled by the communication control apparatus 100-1.
- the another communication node includes another master WSD 10 other than the master WSD 10 in which interference is estimated among the plurality of master WSDs 10.
- the other communication node is included in the same set 40 as the master WSD 10 other than the master WSD 10 from which interference is estimated, among the plurality of master WSDs 10.
- the master WSD 10 is included.
- the second interference is interference caused by a downlink signal transmitted by the another communication node or an uplink signal transmitted to the another communication node.
- the second interference is transmitted to another master WSD 10 other than the master WSD 10 whose interference is estimated, or interference due to a downlink signal transmitted by another master WSD 10 other than the master WSD 10 whose interference is estimated. Interference caused by uplink signals.
- the second interference is interference with communication involving the master WSD 10. More specifically, the second interference is interference to uplink communication (transmission from the slave WSD 30 to the master WSD 10) and / or interference to downlink communication (transmission from the master WSD 10 to the slave WSD 30). It is. In other words, the second interference is an interference to an uplink signal (send signal of the slave WSD 30) received by the master WSD 10 and / or a downlink signal (transmit signal of the master WSD 10) received by the slave WSD 30. Is an interference.
- the second interference is interference with uplink communication (that is, interference with uplink signals). This can provide greater interference to communications involving the master WSD 10. Moreover, interference can be estimated more easily.
- the interference estimation unit 133 estimates the second interference in each of the two or more frequency channel candidates for each of the plurality of master WSDs 10.
- the two or more frequency channel candidates are frequency channels that can be secondarily used by the communication system 1 among the frequency channels for the primary system.
- the two or more frequency channel candidates are two or more frequency channel candidates. That is, the second interference in each of two or more frequency channel candidates is estimated.
- the interference estimation unit 133 temporarily sets the frequency channel used by each of the plurality of master WSDs 10 to be controlled in order to calculate the second interference.
- the frequency channel used immediately before is temporarily set. For example, immediately before a certain communication node is using a certain frequency channel, the certain frequency channel is temporarily set in the certain communication node. Also, immediately before another communication node is using another frequency channel, the other communication channel is temporarily set in the other communication node.
- the temporarily set frequency channel is not the frequency channel used immediately before, the frequency channel with low interference from the primary system, the frequency channel selected based on the measurement or sensing result, or the randomly selected frequency channel It may be a frequency channel or the like.
- the second interference in individual frequency channel candidates is first caused by communication involving each of the other communication nodes (other master WSDs 10) to be controlled. It is estimated by estimating the interference and summing the interference estimated for each of the other communication nodes.
- interference from communication involving each of the other master WSDs 10 to be controlled is one of the following. (1) Interference from transmission of master WSD 10 only (interference due to downlink signal only) (2) Interference from only transmission of slave WSD 30 (interference due to uplink signal only) (3) Interference from transmission of master WSD 10 and transmission of slave WSD 30 (interference due to downlink signal and uplink signal)
- the interference (1) above is interference when the master WSD 10 performs only downlink communication.
- the interference estimation unit 133 can estimate the interference of (1) above based on information (position, antenna height, transmission power, etc.) regarding the master WSD 10 and information on provisional setting of the frequency channel.
- the interference (2) above is interference when the master WSD 10 performs only uplink communication.
- the interference estimation unit 133 assumes information (position, antenna height, transmission power, etc.) regarding the slave WSD 30, and based on the assumed information and information on provisional setting of the frequency channel (2) Interference may be estimated.
- the interference (3) above is interference when the master WSD 10 performs both uplink communication and downlink communication.
- the frequency channel candidate for uplink communication and the frequency channel candidate for downlink communication are separate frequency channel candidates (for example, in the case of FDD) and the same frequency channel (for example, TDD). )
- the interference estimation unit 133 estimates interference from the downlink communication (interference due to the downlink signal) in the same manner as the interference of (1) above, and determines interference from the uplink communication (interference due to the uplink signal). The estimation is performed in the same manner as the interference in (2) above, and the estimated interference is summed. In the latter case, the interference estimation unit 133 estimates interference from one of downlink communication and uplink communication.
- the interference estimation unit 133 estimates the interference from the downlink communication (interference due to the downlink signal) and the interference from the uplink communication (interference due to the uplink signal). Select. With such a selection, greater interference to communications involving the master WSD 10 can be estimated.
- the slave WSD 30 when estimating interference from the transmission of the slave WSD 30 (interference due to the uplink signal), information (position, antenna height, transmission power, etc.) regarding the slave WSD 30 is assumed.
- the slave WSD 30 exists in a predetermined range or a predetermined position closer to the master WSD 10 where interference is estimated, in the communication range 20 of the master WSD 10 that is the transmission destination of the uplink signal of the own device.
- the interference estimation part 133 estimates the interference by an uplink signal on this assumption.
- FIG. 9 is an explanatory diagram for explaining an example of the position of the slave WSD 30 assumed when the interference due to the uplink signal is estimated.
- master WSDs 10-1 to 10-5 are shown.
- interference with uplink communication of the master WSD 10-1 is estimated.
- the slave WSD 30 that transmits an uplink signal to the master WSD 10-2 is located at a position 41-2 closest to the master WSD 10-1 in the communication range 20-2 of the master WSD 10-2, Assumed.
- the slave WSD 30 that transmits an uplink signal to the master WSD 10-5 is located at a position 41-5 closest to the master WSD 10-1 in the communication range 20-5 of the master WSD 10-5.
- the interference estimation unit 133 estimates a reception power value of an interference signal, for example.
- the power value of interference from communication involving another master WSD 10 to be controlled that is, a downlink signal from another master WSD 10 and / or an uplink signal (interference signal to another master WSD 10 in the master WSD 10).
- Received power value is expressed as follows.
- n indicates an index of the master WSD 10 to be estimated for interference among the plurality of master WSDs 10.
- f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- the interference estimation unit 133 acquires information on the secondary system from the DB 50 via the communication unit 110, for example. Further, as described above, the interference estimation unit 133 assumes information (position, antenna height, transmission power, etc.) regarding the slave WSD 30. Then, the interference estimation unit 133 estimates the second interference based on the acquired information and / or assumed information.
- the information related to the secondary system includes, for example, information related to the master WSD 10 of the secondary system (eg, number, position, antenna height, transmission power).
- the interference information acquisition unit 135 acquires, for each of the plurality of master WSDs 10 to be controlled, first interference information indicating the first interference from communication involving a communication node that is not the control target.
- the plurality of master WSDs 10 are the master WSDs 10 included in the same set 40, and the interference estimation unit 133 acquires the first interference information for each determined set 40.
- the communication nodes that are not controlled include communication nodes that are not controlled by the communication control device 100-1. More specifically, for example, the communication nodes that are not controlled include the communication nodes of the primary system. That is, as an example of an embodiment of the present disclosure, the communication node that is not controlled includes a transmission station of a television broadcasting system.
- the first interference information indicates the first interference in each of two or more frequency channel candidates.
- the two or more frequency channel candidates are frequency channels that can be secondarily used by the communication system 1 among the frequency channels for the primary system.
- the two or more frequency channel candidates are two or more frequency channel candidates. That is, the first interference information indicates the first interference in each of the two or more frequency channel candidates.
- the interference information acquisition unit 135 acquires information indicating the first interference estimated by the interference estimation unit 133 as the first interference information.
- the interference information acquisition unit 135 calculates in advance as a theoretical value from information indicating the first interference actually observed, path loss, or the like, instead of the information indicating the first interference estimated by the interference estimation unit 133.
- Information indicating the first interference thus performed (that is, information stored in the DB 50) may be acquired as the first interference information. In such a case, the first interference does not necessarily have to be estimated by the interference estimation unit 133 as described above.
- the interference information acquisition unit 135 also provides, for each of the plurality of master WSDs 10 to be controlled, second interference information indicating second interference from communication involving another communication node to be controlled. To get.
- the plurality of master WSDs 10 are master WSDs 10 included in the same set 40, and the interference estimation unit 133 acquires the second interference information for each determined set 40.
- the other communication node to be controlled is a communication node to be controlled by the communication control apparatus 100-1. More specifically, for example, the another communication node includes another master WSD 10 other than the master WSD 10 in which interference is estimated among the plurality of master WSDs 10.
- the second interference information indicates the second interference in each of the two or more frequency channel candidates.
- the two or more frequency channel candidates are frequency channels that can be secondarily used by the communication system 1 among the frequency channels for the primary system.
- the two or more frequency channel candidates are two or more frequency channel candidates. That is, the second interference information indicates the second interference in each of the two or more frequency channel candidates.
- the interference information acquisition unit 135 acquires information indicating the second interference estimated by the interference estimation unit 133 as the second interference information.
- the interference information acquisition unit 135 calculates in advance as a theoretical value from information indicating the actually observed second interference, path loss, or the like, instead of the information indicating the second interference estimated by the interference estimation unit 133.
- Information indicating the second interference performed (that is, information stored in the DB 50) may be acquired as the second interference information. In such a case, the second interference does not necessarily have to be estimated by the interference estimation unit 133 as described above.
- the classification unit 137 Based on the first interference information and the second interference information for the plurality of master WSDs 10 to be controlled, the classification unit 137 includes a plurality of groups related to determination of frequency channels that can be used by the master WSD 10. The plurality of master WSDs 10 are classified. Further, for example, the plurality of master WSDs 10 are master WSDs 10 included in the same set 40, and the classification unit 137 classifies the master WSDs 10 for each set 40 determined.
- the plurality of groups are a plurality of groups corresponding to the order in which the frequency channels are determined. More specifically, for example, the plurality of groups include at least a first group and a second group. The second group is a group in which the frequency channel is determined after the first group or before the first group.
- the classification unit 137 classifies the plurality of master WSDs into a plurality of groups including the first group and the second group. As an example, the classification unit 137 classifies the plurality of master WSDs 10 into two groups, the first group and the second group.
- the master WSD 10 classified into the first group has a larger degree of the first interference with respect to the second interference than the master WSD 10 classified into the second group. It is. That is, the classification unit 137 has a higher degree of the first interference with respect to the second interference in the master WSD 10 classified in the first group than in the master WSD 10 classified in the second group.
- the plurality of master WSDs 10 are classified into a plurality of groups including the first group and the second group so as to increase.
- the classification unit 137 classifies the master WSDs 10 having a higher degree of the first interference with respect to the second interference among the plurality of master WSDs 10 into the first group. Further, the classifying unit 137 classifies the master WSD 10 having a smaller degree of the first interference with respect to the second interference among the plurality of master WSDs 10 into the second group.
- the second group is a group in which the frequency channel is determined after the first group.
- the classifying unit 137 first determines an available frequency channel for the master WSD 10 having a higher degree of the first interference with respect to the second interference among the plurality of master WSDs 10. Into the first group.
- the classification unit 137 also includes a second group in which an available frequency channel is determined later for the master WSD 10 having a smaller degree of the first interference with respect to the second interference among the plurality of master WSDs 10. Classify into:
- an available frequency channel for the master WSD 10 having relatively weak interference in the secondary system with respect to interference from the primary system is determined first. Then, the available frequency channels for the master WSD 10 with relatively strong interference in the secondary system relative to interference from the primary system are then determined. That is, an available frequency channel for the master WSD 10 that has a smaller influence on interference due to determination of an available frequency channel in the secondary system (for example, variation in the magnitude of interference) is determined first. Then, an available frequency channel for the master WSD 10 that has a greater impact on interference due to the determination of available frequency channels in the secondary system (eg, variation in the magnitude of the interference) is then determined.
- the master WSD 10 that is more influenced by the determination of the available frequency channel in the secondary system, it can be used more appropriately in consideration of the determined available frequency channel for the other master WSD 10. It becomes possible to determine the frequency channel.
- the influence for the master WSD 10 that is less affected by the determination of the available frequency channel in the secondary system, the influence (for example, the magnitude of interference) is determined by determining the available frequency channel for the other master WSD 10. Fluctuations), but the impact is small.
- a more suitable available frequency channel for each master WSD 10 may be determined within the secondary system. As a result, communication of the master WSD 10 that secondarily uses the frequency channel can be improved.
- the frequency channels that can be used for each group are determined in order (that is, the frequency channels that can be used for the subdivided master WSD 10 are determined in order), the number of combinations of the master WSD 10 and the frequency channel candidates is determined. Decrease. As a result, the calculation amount can be suppressed.
- the degree of the first interference with respect to the second interference is a frequency channel in which the magnitude of the first interference is greater than the magnitude of the second interference by a predetermined threshold or more.
- the magnitude of the first interference and the magnitude of the second interference are reception powers of interference signals in the master WSD 10 that receives the interference.
- the degree of the first interference relative to the second interference is such that the magnitude of the first interference (reception power of the interference signal) is greater than the magnitude of the second interference (reception power of the interference signal). This corresponds to the number of frequency channel candidates that is larger by the threshold value.
- the predetermined threshold is 0, and the above degree is a ratio of frequency channel candidates in which the magnitude of the first interference is larger than that of the second interference.
- the classification unit 137 classifies the master WSD 10 whose ratio exceeds the threshold value x (0 ⁇ x ⁇ 1) into a first group in which an available frequency channel is determined first. Further, the classification unit 137 classifies the master WSD 10 whose ratio is equal to or less than the threshold value x into a second group in which an available frequency channel is determined later. That is, the classification unit 137 classifies the plurality of master WSDs 10 as follows.
- n indicates an index of the master WSD 10 to be classified among the plurality of master WSDs 10.
- G 1st indicates the first group
- G 2nd indicates the second group.
- f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- N channel indicates the number of frequency channel candidates (that is, the number of frequency channels that the communication system 1 can use).
- p represents a set of frequency channels satisfying P I, Primary, n (f)> P I, WSD, n (f). Card ⁇ ... ⁇ Is the density of the set (Cardinality). If the elements of the set are discrete, card ⁇ ... ⁇ Is equivalent to the number of elements in the set (ie, the number of frequency channel candidates).
- x is a threshold value that is greater than 0 and less than 1.
- the master WSD 10 having relatively weak interference in the secondary system with respect to interference from the primary system, and the master WSD 10 having relatively strong interference in the secondary system with respect to interference from the primary system Can be classified.
- the channel determination unit 139 determines an available frequency channel for each of the plurality of master WSDs 10 to be controlled.
- the plurality of master WSDs 10 are the master WSDs 10 included in the same set 40, and the interference estimation unit 133 classifies the master WSDs 10 for each determined set 40.
- the channel determination unit 139 determines the frequency channel for each of the one or more master WSDs 10 classified into the first group. Further, the channel determination unit 139 determines the frequency channel for each of the one or more master WSDs 10 classified into the second group based on the determination result of the frequency channel in the first group.
- the master WSD 10 classified in the first group is more sensitive to the second interference than the master WSD 10 classified in the second group.
- the master WSD 10 has a larger first degree of interference.
- the channel determination unit 139 may select one or more frequency channel candidates having a smaller first interference magnitude among the two or more frequency channel candidates as the master WSD 10 that is classified into the first group. Determine the available frequency channels for.
- the two or more frequency channel candidates are frequency channels that can be secondarily used by the communication system 1 among the frequency channels for the primary system.
- the master WSD 10 classified into the first group for example, the master WSD 10 having relatively strong interference from the primary system with respect to interference in the secondary system
- the communication quality of the master WSD 10 classified into the first group can be improved, and the communication of the master WSD can be improved.
- Such determination is particularly effective when the magnitude of interference from the primary system varies depending on the frequency channel candidates.
- the channel determination unit 139 determines one or more frequency channel candidates used by the master WSD 10 classified in the first group as available frequency channels for the master WSD 10. May be. Such determination of the frequency channel eliminates the need for re-determination, and thus the amount of calculation can be reduced. Such a determination is particularly effective when there is not much variation in the magnitude of interference from the primary system depending on the frequency channel candidates.
- the channel determination unit 139 may determine the available frequency channels for the master WSD 10 classified into the first group by another method.
- the master WSD 10 classified into the second group is more sensitive to the second interference than the master WSD 10 classified into the second group.
- the master WSD 10 has a smaller first degree of interference.
- the channel determination unit 139 performs, for each of the one or more master WSDs 10 classified into the second group, based on the determination result of the frequency channel in the first group.
- the frequency channel is determined.
- the channel determination unit 139 determines the resource (frequency channel) for each of the one or more master WSDs 10 classified into the second group. For example, at this time, the channel determination unit 139 determines the frequency channel for the master WSD 10 in which the magnitude of the second interference is smaller. Then, the channel determination unit 139 determines the frequency channel for the master WSD 10 having a larger magnitude of the second interference based on the determination result of the frequency channel for the master WSD 10. In other words, the channel determination unit 139 determines available frequency channels for the master WSD 10 in order from the master WSD 10 having the smaller second interference magnitude.
- the channel determination unit 139 selects available frequency channels in order from the master WSD 10 having the smallest maximum magnitude of the second interference magnitudes in the two or more frequency channel candidates. decide.
- the maximum magnitude is the power value of interference from communication involving another master WSD 10 to be controlled in two or more frequency channel candidates (that is, the received power value of the interference signal) PI , WSD, It is the maximum size of n (f).
- the maximum size PI_MAX, WSD, n can be expressed as follows.
- the channel determination unit 139 determines available frequency channels in the order of increasing the maximum size PI_MAX, WSD, n . For example, the channel determination unit 139 determines an available frequency channel for the k-th master WSD 10 based on the determination result for the 1st to (k ⁇ 1) -th master WSD 10. Further, for example, the channel determination unit 139 determines an available frequency channel for the k-th master WSD 10 based on the temporary setting result of the frequency channel for the (k + 1) th and subsequent master WSDs 10.
- an available frequency channel for the master WSD 10 with less interference in the secondary system is determined first.
- the available frequency channels for the master WSD 10 with stronger interference in the secondary system are then determined. That is, an available frequency channel for the master WSD 10 that has a smaller influence on interference due to determination of an available frequency channel in the secondary system (for example, variation in the magnitude of interference) is determined first. Then, an available frequency channel for the master WSD 10 that has a greater impact on interference due to the determination of available frequency channels in the secondary system (eg, variation in the magnitude of the interference) is then determined.
- a more suitable available channel in consideration of the determined available frequency channel for the other master WSD 10 can be determined.
- the influence for the master WSD 10 that is less affected by the determination of the available frequency channel in the secondary system, the influence (for example, the magnitude of interference) is determined by determining the available frequency channel for the other master WSD 10. Fluctuations), but the impact is small.
- a more suitable available frequency channel for each master WSD 10 may be determined within the secondary system. As a result, communication of the master WSD 10 that secondarily uses the frequency channel can be improved.
- the channel determination unit 139 determines an available frequency channel for the kth master WSD 10 based also on the determination result of the frequency channel in the first group.
- the channel determination unit 139 can use one or more frequency channel candidates of the two or more frequency channel candidates for the master WSD 10 classified into the second group. Is determined as the correct frequency channel.
- the one or more frequency channel candidates are one or more frequency channel candidates having a smaller magnitude of interference including the first interference and the second interference.
- the channel determination unit 139 determines the first in each of two or more frequency channel candidates from the first interference information. Know the magnitude of the interference. Further, the channel determination unit 139 re-estimates the second interference in each of the two or more frequency channel candidates, or causes the interference estimation unit 133 to re-estimate.
- the magnitude of the first interference is the received power value of the transmission signal (interference signal) of the transmission station (interference signal) of the primary system (television broadcasting system) PI , Primary, n (f). expressed.
- the magnitude of the second interference is the power value of interference from the communication involving another master WSD 10 to be controlled (that is, the received power value of the interference signal) PI , WSD, n (f). expressed. Then, the channel determination unit 139 calculates the following worst interference power value PI , worst, n (f) as the magnitude of interference including the first interference and the second interference.
- the channel determination unit 139 determines the frequency channel candidate having the minimum worst interference power value PI , worst, n (f) as an available frequency channel for the kth master WSD 10. .
- the available channels for the master WSD 10 are determined so that the magnitude of the worst-case interference becomes smaller. As a result, communication of the master WSD 10 can be improved.
- the channel determination unit 139 also determines an available frequency channel for the master WSD 10 not classified into any group.
- the channel determination unit 139 determines an available frequency channel for each of the plurality of master WSDs 10 to be controlled. For example, thereafter, the channel determination unit 139 notifies each master WSD 10 of the determined available frequency channel via the communication unit 110.
- an available frequency channel may be finally determined so that interaction for notification of the available channel to the master WSD 10 is suppressed.
- an available frequency channel is not necessarily determined and notified, and even when a predetermined condition is satisfied, the available frequency channel is finally determined and notified.
- the predetermined condition is that the magnitude of the difference between the interference in the available channel determined last time and the interference in the available frequency channel determined this time exceeds a predetermined threshold. Also good. That is, if the magnitude of the difference does not exceed the predetermined threshold, the available channel determined last time may be continuously used. Thereby, the interaction for notifying the master WSD 10 of available channels can be suppressed.
- the determination of such a predetermined condition may be performed for each master WSD, or may be performed for the entire master WSD.
- FIG. 10 is a flowchart illustrating an example of a schematic flow of a communication control process according to the first embodiment.
- the communication control process can be executed for each set 40 of the master WSD 10.
- the interference estimation unit 133 temporarily sets a frequency channel used by each of the plurality of master WSDs 10 to be controlled (S301).
- the interference estimation unit 133 estimates the first interference (interference from communication involving communication nodes that are not controlled) in each frequency channel candidate for each of the plurality of master WSDs 10 (S303).
- the interference estimation unit 133 estimates, for each of the plurality of master WSDs 10, second interference (interference from communication involving another communication node to be controlled) in each frequency channel candidate (S305).
- the interference information acquisition unit 135 acquires first interference information indicating the first interference and second interference information indicating the second interference for each of the plurality of master WSDs 10 (S307). .
- the classification unit 137 classifies the plurality of master WSDs 10 into a first group and a second group based on the first interference information and the second interference information regarding the plurality of master WSDs 10 ( S309).
- the channel determination unit 139 determines an available frequency channel for each of the one or more master WSDs 10 classified in the first group (S311).
- the channel determination unit 139 determines an available frequency channel for each of the one or more master WSDs 10 classified into the second group based on the determination result of the frequency channel in the first group. (S313). At this time, for example, the channel determination unit 139 first determines an available frequency channel for the master WSD 10 having a smaller second interference magnitude. Then, the channel determination unit 139 determines an available frequency channel for the master WSD 10 having a larger magnitude of the second interference based on the determination result of the available frequency channel for the master WSD 10.
- the channel determination unit 139 notifies each master WSD 10 of the determined available frequency channel via the communication unit 110 (S315). Then, the process ends.
- the plurality of groups into which the plurality of master WSDs 10 to be controlled are classified include the first group and the second group.
- the master WSD 10 that is classified into the first group is a master WSD 10 that has a higher degree of the first interference with respect to the second interference than the master WSD 10 that is classified into the second group.
- the second group is a group in which the frequency channel is determined after the first group.
- the second group is a group in which the frequency channel is determined before the first group. Even in the modification of the first embodiment, communication of a communication node using a radio resource (frequency channel) can be performed in an environment where there is interference from communication involving a communication node that is not a control target with a smaller amount of calculation. It becomes possible to improve.
- the classification unit 137 Based on the first interference information and the second interference information for the plurality of master WSDs 10 to be controlled, the classification unit 137 includes a plurality of groups related to determination of frequency channels that can be used by the master WSD 10. The plurality of master WSDs 10 are classified. This point is as described above in the example of the first embodiment.
- the plurality of groups are a plurality of groups corresponding to the order in which the frequency channels are determined. More specifically, for example, the plurality of groups includes at least the first group and the second group. These points are also as described above in the first embodiment.
- the master WSD 10 classified into the first group has a larger degree of the first interference with respect to the second interference than the master WSD 10 classified into the second group. It is. This point is also as described above in the first embodiment.
- the second group is a group in which the frequency channel is determined before the first group.
- the classifying unit 137 may select a master WSD 10 having a higher degree of the first interference with respect to the second interference among the plurality of master WSDs 10, after which an available frequency channel is determined. Classify into groups.
- the classification unit 137 has a second frequency channel in which the master WSD 10 that has a smaller degree of the first interference with respect to the second interference among the plurality of master WSDs 10 is determined first. Classify into groups.
- an available frequency channel for the master WSD 10 having relatively strong interference in the secondary system with respect to interference from the primary system is determined first. Then, an available frequency channel for the master WSD 10 with relatively weak interference in the secondary system relative to interference from the primary system is determined.
- an available frequency channel is determined, and then the interference to the communication of the master WSD 10 is reduced. It is possible to determine available frequency channels for the master WSD. Thus, a more suitable available frequency channel for each master WSD 10 may be determined within the secondary system. As a result, communication of the master WSD 10 that secondarily uses the frequency channel can be improved.
- the frequency channels that can be used for each group are determined in order (that is, the frequency channels that can be used for the subdivided master WSD 10 are determined in order), the number of combinations of the master WSD 10 and the frequency channel candidates is determined. Decrease. As a result, the calculation amount can be suppressed.
- the channel determination unit 139 determines the frequency channel for each of the one or more master WSDs 10 classified in the second group. Further, the channel determination unit 139 determines the frequency channel for each of the one or more master WSDs 10 classified into the first group based on the determination result of the frequency channel in the second group.
- the channel determination unit 139 is classified into the second group without being based on the determination result of the frequency channel in the first group.
- the frequency channel for each of the one or more master WSDs 10 is determined. Except for this point, it is as described above as an example of the first embodiment.
- the channel determination unit 139 determines the first group based on the determination result of the frequency channel in the second group.
- the frequency channel for each of the one or more master WSDs 10 classified as follows is determined.
- the channel determination unit 139 determines one or more frequency channel candidates among the two or more frequency channel candidates as the frequency channel for the master WSD 10 classified into the first group.
- the one or more frequency channel candidates are one or more frequency channel candidates that have a smaller third interference magnitude with respect to the one or more master WSDs 10 that are classified into the second group.
- the one or more frequency channel candidates having a smaller third interference magnitude may have a maximum magnitude of the third interference magnitude to one or more master WSDs 10 at other frequencies.
- the one or more frequency channel candidates having a smaller third interference magnitude may be obtained when the sum of the third interference magnitudes to one or more master WSDs 10 is another frequency channel.
- the frequency channel candidate may be smaller than the candidate.
- the frequency channel in the first group is determined.
- the master WSD 10 classified into the second group for example, the master WSD 10 having relatively strong interference in the secondary system with respect to interference from the primary system
- interference in the secondary system is further reduced. It becomes possible to do. Therefore, the communication quality of the master WSD 10 classified into the second group can be improved, and the communication of the master WSD can be improved.
- FIG. 11 is a flowchart illustrating an example of a schematic flow of a communication control process according to the first modification of the first embodiment.
- the communication control process can be executed for each set 40 of the master WSD 10.
- Steps S301 to S309 and S315 in the example of the communication control process of the first embodiment described with reference to FIG. 10, and the first modification of the first embodiment described with reference to FIG. Steps S401 to S409 and S415 in the example of the example communication control process are the same. Therefore, only steps S411 and S413 will be described here.
- the channel determination unit 139 determines an available frequency channel for each of the one or more master WSDs 10 classified in the second group (S411). At this time, for example, the channel determination unit 139 first determines an available frequency channel for the master WSD 10 having a smaller second interference magnitude. Then, the channel determination unit 139 determines an available frequency channel for the master WSD 10 having a larger magnitude of the second interference based on the determination result of the available frequency channel for the master WSD 10.
- the channel determination unit 139 determines an available frequency channel for each of the one or more master WSDs 10 classified in the first group based on the determination result of the frequency channel in the second group. (S313). At this time, for example, the channel determination unit 139 selects one or more frequency channel candidates having a smaller third interference magnitude with respect to the one or more master WSDs 10 classified into the second group as described above. It is determined as an available frequency channel for the master WSD 10 classified in the first group.
- the communication nodes that are not controlled include the communication nodes of the primary system.
- the communication node that is not the control target further includes another communication node in addition to the communication node of the primary system.
- Interference estimator 133 First interference from communication involving non-controlled communication nodes First, the interference estimation unit 133 performs first communication from communication involving non-controlled communication nodes for each of the plurality of master WSDs 10. Estimate the interference.
- the communication node that is not to be controlled includes a communication node that is not to be controlled by the communication control apparatus 100-1.
- the communication nodes that are not controlled include the communication nodes of the primary system. That is, as an example of an embodiment of the present disclosure, the communication node that is not controlled includes a transmission station of a television broadcasting system.
- the communication node that is not controlled includes another communication node in addition to the communication node of the primary system.
- the another communication node is a communication node (for example, master WSD) of a secondary system different from the communication system 1.
- the other secondary system is a secondary system that does not have any control by the communication control device 100-1.
- the other secondary system is a secondary system having a higher priority than the communication system 1.
- the another communication node is a communication node of a communication system operated in another area adjacent to the certain area.
- the communication system operated in the other area is a primary system or a secondary system operated in the other area.
- FIG. 12 is an explanatory diagram for explaining an example of a communication system operated in another area adjacent to an area where the communication system 1 is operated.
- the communication system 1 operated in the area 80A and the communication system 1 operated in the area 80B are shown.
- the region 80A and the region 80B each indicate a country, and the border (Border) between the region 80A and the region 80B indicates a border.
- the region 80A and the region 80B each indicate a region, and the boundary (Border) between the region 80A and the region 80B indicates a boundary between regions.
- the master WSD 10B is not a target of control by the communication control apparatus 100A.
- the interference estimation unit 133 estimates interference including interference from the primary system of the region 80A, interference from the primary system of the region 80B, and interference from the master WSD 10B of the region 80B as the first interference.
- the another communication node is a further communication node.
- the interference estimation unit 133 separately estimates interference from communication involving the communication node of the primary system and interference from communication involving the other communication node, and totals the calculated interference. By doing so, the first interference can be estimated.
- the communication nodes that are not controlled include other communication nodes in addition to the communication nodes of the primary system. Then, first interference including interference from communication involving the other communication node is estimated. Thereby, not only the communication node of the primary system but also the existence of another communication node that is not controlled is considered. This makes it possible to determine a more appropriate available frequency channel.
- another communication node to be controlled includes another master WSD 10 of the communication system 1 that is a secondary system.
- another communication node to be controlled further includes another communication node in addition to another master WSD 10 of the communication system 1.
- Interference estimator 133 Second interference from communication involving another communication node to be controlled Secondly, the interference estimation unit 133 involves another communication node to be controlled for each of the plurality of master WSDs 10 to be controlled. Estimate a second interference from the communication.
- the other communication node to be controlled is a communication node to be controlled by the communication control apparatus 100-1.
- the another communication node includes another master WSD 10 other than the master WSD 10 in which interference is estimated among the plurality of master WSDs 10.
- the other communication node is included in the same set 40 as the master WSD 10 other than the master WSD 10 from which interference is estimated, among the plurality of master WSDs 10.
- the master WSD 10 is included.
- another communication node to be controlled includes another communication node in addition to the other master WSD 10 included in the communication system 1.
- the communication control apparatus 100 when the communication control apparatus 100 is involved in determining an available frequency channel for a communication node included in another communication system other than the communication system 1, the other communication node The communication node included in another communication system is included.
- the communication control apparatus 100 determines an available frequency channel for a master WSD included in another secondary system other than the communication system 1, the another communication node The master WSD included in the system is included.
- the communication control device 100A determines an available frequency channel for the master WSD 10A
- the communication control device 100B determines an available frequency channel for the master WSD 10B. Then, the communication control device 100A and the communication control device 100B cooperate to determine an available frequency channel.
- the other communication node for the communication control apparatus 100A may include the master WSD 10B. Further, the other communication node for the communication control apparatus 100B may include a master WSD 10A.
- another communication node to be controlled includes another communication node in addition to another master WSD 10 included in the communication system 1. Then, second interference including interference from communication involving the other communication node is estimated. Thereby, not only the master WSD 10 included in the communication system 1 but also the presence of a further communication node to be controlled is considered. This makes it possible to determine a more appropriate available frequency channel.
- the first embodiment of the present disclosure has been described.
- a communication node that uses radio resources (frequency channels) in an environment where there is interference from communication involving a communication node that is not controlled, with a smaller amount of calculation. It becomes possible to improve communication.
- the communication system 1 includes a high priority master WSD with a higher priority and a low priority master WSD with a lower priority.
- the low priority master WSD is controlled so as not to affect the high priority master WSD.
- FIG. 13 is an explanatory diagram for explaining an example of the master WSD included in the communication system 1-2 according to the second embodiment.
- the communication system 1-2 according to the second embodiment includes a high priority master WSD 11 having a higher priority and a low priority master WSD 13 having a lower priority.
- the high priority master WSD 11 and the low priority master WSD 13 are included in the same set 41.
- the communication control apparatus 100-2 determines an available frequency channel for each low priority master WSD 13 so that the communication of the low priority master WSD 13 does not affect the communication of the high priority master WSD 11.
- an available frequency channel for the high priority master WSD 11 is determined first. Then, based on the determination result of the available frequency channel for the high priority master WSD 11, the available frequency channel for the low priority master WSD 13 is determined.
- FIG. 14 is a block diagram showing an example of the configuration of the communication control apparatus 100-2 according to the second embodiment.
- the communication control apparatus 100-2 includes a communication unit 110, a storage unit 120, and a control unit 140.
- the communication unit 110, the storage unit 120, and the set determination unit 131 of the control unit 140 are not different between the first embodiment and the second embodiment. Therefore, the interference estimation unit 141, the interference information acquisition unit 143, the interference determination unit 145, the classification unit 147, and the channel determination unit 149 of the control unit 140 will be described.
- the interference estimation unit 141 separately calculates interference for each of the high priority master WSDs 11 having a higher priority and interference for the low priority master WSD 13 having a lower priority.
- the interference estimation unit 141 estimates interference for each of the plurality of high priority master WSDs 11 to be controlled.
- the plurality of high priority master WSDs 11 are the high priority master WSDs 11 included in the same set 41, and the interference estimation unit 141 estimates the interference for each determined set 41.
- the interference estimation unit 141 performs communication from communication involving non-controlled communication nodes for each of the plurality of high priority master WSDs 11. Of the first interference. Similar to the interference estimation unit 133 according to the first embodiment, the interference estimation unit 141 estimates the first interference for each of the high priority master WSDs 11.
- the interference estimation unit 141 determines whether another communication node to be controlled for each of the plurality of high priority master WSDs 11 to be controlled. Estimate the second interference from communications involving.
- the other communication node to be controlled is a communication node to be controlled by the communication control apparatus 100-2.
- the another communication node is another high-priority master WSD11 other than the high-priority master WSD11 in which interference is estimated among the plurality of high-priority master WSD11.
- the another communication node is another high-priority master WSD11 other than the high-priority master WSD11 whose interference is estimated, among the plurality of high-priority masters WSD11, and the high-priority master whose interference is estimated
- the high priority master WSD 11 included in the same set 41 as the WSD 11 is included.
- the another communication node does not include the low priority master WSD 13 having a lower priority.
- the content and estimation method of the second interference are as described in the first embodiment.
- the second interference for the high priority master WSD 11 is expressed as follows.
- the interference estimation unit 141 estimates interference for each of the plurality of low priority master WSDs 13 to be controlled.
- the plurality of low priority master WSDs 13 are low priority master WSDs 13 included in the same set 41, and the interference estimation unit 141 estimates the interference for each determined set 41.
- the interference estimation unit 141 performs communication from communication involving non-controlled communication nodes for each of the plurality of low priority master WSDs 13. Of the first interference.
- Communication nodes not to be controlled include communication nodes that are not to be controlled by the communication control apparatus 100-1.
- the communication nodes that are not controlled include the communication nodes of the primary system. That is, as an example of an embodiment of the present disclosure, the communication node that is not controlled includes a transmission station of a television broadcasting system.
- the available frequency channel for the low priority master WSD 13 is determined. Includes communication nodes that cannot be controlled.
- the communication node that is not controlled above further includes a high priority master WSD 11.
- the first interference is interference caused by a downlink signal transmitted by the communication node not controlled or an uplink signal transmitted to the communication node not controlled.
- the first interference includes interference due to a downlink signal transmitted by a transmission station of a television broadcasting system.
- the first interference includes interference due to a downlink signal transmitted by the high priority WSD 11 or an uplink signal transmitted to the high priority WSD 11.
- the first interference is interference with communication involving the low priority master WSD 13. More specifically, the first interference includes interference to uplink communication (transmission from the slave WSD 30 to the low priority master WSD 13) and / or downlink communication (transmission from the low priority master WSD 13 to the slave WSD 30). ). In other words, the first interference is the interference to the uplink signal (the transmission signal of the slave WSD 30) received by the low priority master WSD 13 and / or the downlink signal (the low priority master WSD 13 received by the slave WSD 30). Interference signal).
- the first interference is interference with uplink communication (that is, interference with uplink signals).
- the interference estimation unit 141 performs the first interference in each of the two or more frequency channel candidates for each of the plurality of low priority master WSDs 13. Is estimated.
- the two or more frequency channel candidates are frequency channels that can be secondarily used by the communication system 1 among the frequency channels for the primary system.
- the interference estimation unit 141 estimates, for example, a reception power value of an interference signal as the first interference.
- the power value of interference from communication involving the communication node of the primary system (that is, the reception power value of the transmission signal (interference signal) of the transmission station of the television broadcasting system in the low priority master WSD 13) is as follows: It is expressed in
- the power value of interference from communication involving the communication node of the high priority master WSD 11 (that is, the transmission signal of the high priority master WSD 11 or the transmission signal of the slave WSD 30 communicating with the high priority master WSD 11 in the low priority master WSD 13 (Interference signal) received power value) is expressed as follows.
- the first interference is expressed as follows.
- n indicates an index of the low priority master WSD 13 to be estimated for interference among the plurality of low priority master WSDs 13.
- f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- the interference estimation unit 141 acquires, for example, information on the primary system, information on the secondary system, parameters necessary for referring to interference power, and the like from the DB 50 via the communication unit 110. Moreover, the interference estimation part 141 also acquires the information regarding the determined available frequency channel about the high priority master WSD11. Then, the interference estimation unit 141 estimates the first interference based on the acquired information.
- the information related to the primary system includes, for example, information related to the communication node (transmitting station) of the primary system (for example, number, position, antenna height, transmission power) and the like.
- the information regarding the secondary system includes, for example, information regarding the master WSD of the secondary system (for example, the number, position, antenna height, transmission power).
- the interference estimation unit 141 is configured to control another communication node to be controlled with respect to each of the plurality of low priority master WSDs 13 to be controlled. Estimate the second interference from communications involving.
- the other communication node to be controlled is a communication node to be controlled by the communication control apparatus 100-2.
- the another communication node is another low-priority master WSD 13 other than the low-priority master WSD 13 in which interference is estimated among the plurality of low-priority master WSDs 13. including.
- the another communication node is another low-priority master WSD13 other than the low-priority master WSD13 whose interference is estimated, among the plurality of low-priority masters WSD13, and the low-priority master whose interference is estimated
- a low priority master WSD 13 included in the same set 41 as the WSD 13 is included.
- the another communication node does not include the high priority master WSD 11 having a higher priority.
- the content and estimation method of the second interference are as described in the first embodiment.
- the second interference for the low priority master WSD 13 is expressed as follows.
- n indicates an index of the low priority master WSD 13 to be estimated for interference among the plurality of low priority master WSDs 13.
- f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- the interference estimation unit 141 acquires information on the secondary system from the DB 50 via the communication unit 110, for example. Further, as described above, the interference estimation unit 141 assumes information (position, antenna height, transmission power, etc.) regarding the slave WSD 30. Then, the interference estimation unit 141 estimates the second interference based on the acquired information and / or assumed information.
- the information related to the secondary system includes, for example, information related to the master WSD 10 of the secondary system (eg, number, position, antenna height, transmission power).
- the interference information acquisition unit 143 acquires, for each of the plurality of high priority master WSDs 11 to be controlled, first interference information indicating the first interference from communication involving communication nodes that are not controlled.
- the interference information acquisition unit 143 acquires second interference information indicating second interference from communication involving another communication node to be controlled for each of the plurality of high priority master WSDs 11 to be controlled.
- the interference information acquisition unit 143 acquires, as the first interference information, information indicating the first interference estimated by the interference estimation unit 141 for each of the plurality of high priority master WSDs 11 to be controlled. Further, the interference information acquisition unit 143 acquires information indicating the second interference estimated by the interference estimation unit 141 as the second interference information for each of the plurality of high priority master WSDs 11 to be controlled.
- the interference information acquisition unit 143 acquires, as the first interference information, information indicating the first interference actually observed instead of the information indicating the first interference estimated by the interference estimation unit 141. May be.
- the interference information acquisition unit 143 acquires first interference information indicating first interference from communication involving a communication node that is not the control target, for each of the plurality of low-high priority master WSDs 13 that are the control target.
- the interference information acquisition unit 143 acquires, for each of the plurality of low-high priority master WSDs 13 to be controlled, second interference information indicating second interference from communication involving another communication node to be controlled. .
- the interference information acquisition unit 143 acquires, as the first interference information, information indicating the first interference estimated by the interference estimation unit 141 for each of the plurality of low-high priority master WSDs 13 to be controlled. Further, the interference information acquisition unit 143 acquires, as second interference information, information indicating the second interference estimated by the interference estimation unit 141 for each of the plurality of low and high priority master WSDs 13 to be controlled.
- the interference information acquisition unit 143 acquires, as the first interference information, information indicating the first interference actually observed instead of the information indicating the first interference estimated by the interference estimation unit 141. May be.
- Interference determination unit 145) For each of the plurality of low-priority master WSDs 13, the interference determining unit 145 calls a predetermined condition (hereinafter referred to as “interference condition”) for the fourth interference to communication involving the plurality of high-priority master WSDs 11. ) Is satisfied.
- the interference determining unit 145 estimates, for each of the plurality of low priority master WSDs 13, the fourth interference to communication involving the plurality of high priority master WSDs 11.
- the interference determination unit 145 estimates the fourth interference on the basis of the determination result.
- the interference determination unit 145 estimates the fourth interference for each frequency channel for each of the plurality of low priority master WSDs 13.
- the interference determination unit 145 estimates the fourth interference for each high-priority master WSD 11 for each frequency channel candidate.
- the interference determination unit 145 estimates, for example, the received power value of the interference signal as the fourth interference.
- the power value of interference from the communication involving the low priority master WSD 13 to the communication involving the high priority master WSD 11 that is, the downlink signal from the low priority master WSD 13 and / or the low priority master WSD 13 in the high priority master WSD 11.
- the received power value of the uplink signal is expressed as follows.
- n indicates an index of the low priority master WSD 13. Further, i indicates an index of the high priority master WSD11. Further, f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- the interference determination unit 145 determines whether the interference condition is satisfied for each of the plurality of low priority master WSDs 13.
- the given interference condition is that the magnitude of the fourth interference is smaller than a predetermined threshold value. That is, the interference determination unit 145 determines, for each of the plurality of low priority master WSDs 13, whether the magnitude of the fourth interference is smaller than a predetermined threshold.
- the given interference determination unit 145 determines, for each of the plurality of low priority master WSDs 13, whether the magnitude of the fourth interference is smaller than a predetermined threshold for each frequency channel candidate.
- the interference determination unit 145 obtains the maximum one of the magnitudes of the fourth interference for each of the plurality of low priority master WSDs 13 as follows.
- the interference determination unit 145 performs the following determination for each of the plurality of low priority master WSDs 13 for each frequency channel candidate.
- n an index of the low priority master WSD 13.
- f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- P I, th represents a predetermined threshold value.
- the interference determination unit 145 determines, for each of the plurality of low priority master WSDs 13, whether the interference condition for the fourth interference is satisfied for each frequency channel candidate.
- the classification unit 147 classifies the plurality of high priority master WSDs 11 and the plurality of low priority master WSDs 13 separately. That is, the classification unit 147 classifies the plurality of high priority master WSDs 11 into a plurality of groups. Further, the classification unit 147 classifies the plurality of low priority master WSDs 13 into a plurality of groups separately from the plurality of high priority master WSDs 11. It should be noted that the high priority master WSD 11 and the low priority master WSD 13 are not mixed in each group.
- the classifying unit 147 includes a plurality of frequency channels related to determination of frequency channels that can be used by the high priority master WSD 11.
- the plurality of high priority master WSDs 11 are classified into groups. Further, for example, the plurality of high priority master WSDs 11 are high priority master WSDs 11 included in the same set 41, and the classification unit 147 classifies the high priority master WSDs 11 for each set 41 determined.
- the specific classification method is as described in the first embodiment.
- the high priority master WSD 11 is classified as follows.
- n indicates an index of the high priority master WSD11 to be classified among the plurality of high priority master WSD11.
- G 1st indicates the first group
- G 2nd indicates the second group.
- f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- N channel indicates the number of frequency channel candidates (that is, the number of frequency channels that the communication system 1 can use).
- p indicates a set of frequency channels satisfying P I, Primary, n (f)> P I, WSD_High, n (f). Card ⁇ ... ⁇ Is the density of the set (Cardinality). If the elements of the set are discrete, card ⁇ ... ⁇ Is equivalent to the number of elements in the set (ie, the number of frequency channel candidates).
- x is a threshold value that is greater than 0 and less than 1.
- the classification unit 147 includes a plurality of frequency channels related to determination of frequency channels that can be used by the low priority master WSD 13.
- the plurality of low priority master WSDs 13 are classified into groups. Further, for example, the plurality of low priority master WSDs 13 are low priority master WSDs 13 included in the same set 41, and the classification unit 147 classifies the low priority master WSDs 13 for each set 41 determined.
- the classification unit 147 classifies the plurality of low priority master WSDs 13 based on the determination result regarding the interference condition. For example, the classification unit 147 excludes the low-priority master WSD 13 that does not satisfy the interference condition for any frequency channel candidate from the classification target, and classifies the low-priority master WSD 13 that satisfies the interference condition into a plurality of groups. To do.
- the specific classification method is as described in the first embodiment.
- the low priority master WSD 13 is classified as follows.
- n indicates an index of the low priority master WSD 13 to be classified among the plurality of low priority master WSDs 13.
- G 1st indicates the first group, and G 2nd indicates the second group.
- f indicates one of the frequency channel candidates among the plurality of frequency channel candidates.
- N channel indicates the number of frequency channel candidates (that is, the number of frequency channels that the communication system 1 can use).
- p represents a set of frequency channels satisfying P I, Primary, n (f) + P I, WSD_High, n (f)> P I, WSD_Low, n (f). Card ⁇ ... ⁇ Is the density of the set (Cardinality). If the elements of the set are discrete, card ⁇ ... ⁇ Is equivalent to the number of elements in the set (ie, the number of frequency channel candidates).
- x is a threshold value that is greater than 0 and less than 1.
- the channel determination unit 149 determines an available frequency channel for each of the plurality of master WSDs to be controlled.
- the channel determination unit 149 first determines available frequency channels for each of the plurality of high priority master WSDs 11 to be controlled. Then, the channel determination unit 149 further determines an available frequency channel for each of the plurality of low priority master WSDs 13 based on the determination result of the available frequency channels for the plurality of high priority master WSDs 11.
- the channel determination unit 149 determines an available frequency channel for each of the plurality of high priority master WSDs 11 to be controlled.
- the channel determination unit 149 determines available frequency channels for each of the high priority master WSDs 11 for each group.
- the channel determination unit 149 determines an available frequency channel for each of the plurality of low priority master WSDs 13 to be controlled.
- the channel determination unit 149 determines the plurality of low priority master WSDs 13 based on the determination result regarding the interference condition. Determine the available frequency channels for each of.
- the channel determination unit 149 determines that there is no usable frequency channel for the low priority master WSD 13 that does not satisfy the interference condition in any frequency channel candidate.
- the channel determination unit 149 determines any available frequency channel for the low priority master WSD 13 that satisfies the interference condition in any frequency channel candidate. Specifically, for example, for such a low priority master WSD 13, the channel determination unit 149 determines one of the frequency channel candidates that satisfies the interference condition as an available frequency channel.
- the channel determination unit 149 determines available frequency channels for each of the low-priority master WSDs 13 for each group, similarly to the determination method described in the first embodiment. However, as described above, any frequency channel candidate is determined as an available frequency channel from among frequency channel candidates that satisfy the interference condition, rather than all frequency channel candidates.
- the channel determination unit 149 may determine, as an available frequency channel, a frequency channel candidate that satisfies an interference condition for each low priority master WSD 13 instead of for each group.
- the channel determination unit 149 determines an available frequency channel for each master WSD to be controlled. For example, the channel determination unit 149 then notifies each master WSD of the determined available frequency channel via the communication unit 110.
- the functional configuration of the communication control apparatus 100-2 according to the second embodiment has been described above. Note that the hardware configuration of the communication control apparatus 100-2 according to the second embodiment is the same as the hardware configuration of the communication control apparatus 100-1 according to the first embodiment.
- FIG. 15 is a flowchart illustrating an example of a schematic flow of a communication control process according to the second embodiment.
- the communication control process may be executed for each master WSD set 41.
- control unit 140 performs frequency channel determination processing for the high priority master WSD 11 (S500).
- control unit 150 performs frequency channel determination processing for the low priority master WSD 13 (S600).
- the frequency channel determination process (S500) for the high priority master WSD 11 is the same as the communication control process (S300) of the first embodiment described with reference to FIG.
- FIG. 16 is a flowchart showing an example of a schematic flow of frequency channel determination processing (S600) for the low-priority master WSD 13.
- the interference determination unit 145 provides fourth interference for each high priority master WSD11 (interference to communication involving the high priority master WSD11) for each frequency channel. Is estimated (S601).
- the interference determination unit 145 determines whether the interference condition is satisfied for each of the plurality of low priority master WSDs 13 (S603).
- the interference estimation unit 141 temporarily sets a frequency channel used by each low priority master WSD 13 (S605).
- the interference estimation unit 141 performs, for each of the plurality of low-priority master WSDs 13, the first interference in each frequency channel candidate (interference from communication involving the communication node of the primary system and communication involving the high-priority master WSD11). ) Is estimated (S607).
- the interference estimation unit 141 estimates the second interference (interference from communication involving another low priority master WSD13) in each frequency channel candidate for each of the plurality of low priority master WSDs 13 (S609).
- the interference information acquisition unit 143 acquires, for each of the plurality of low priority master WSDs 13, first interference information indicating the first interference and second interference information indicating the second interference ( S611).
- the classification unit 147 determines the plurality of low priority master WSDs 13 as a first group and a second group based on the first interference information and the second interference information regarding the plurality of low priority master WSDs 13. (S613).
- the channel determination unit 149 determines an available frequency channel for each of the one or more low priority master WSDs 13 classified in the first group (S615).
- the channel determination unit 149 determines one or more classified into the second group based on the determination result of the frequency channel for the high priority master WSD11 and the determination result of the frequency channel in the first group. An available frequency channel for each of the low priority master WSDs 13 is determined (S617).
- the channel determination unit 149 notifies the determined available frequency channel to each master WSD via the communication unit 110 (S619). Then, the process ends.
- the communication system 1 is a secondary system that secondarily uses the frequency channel (TVWS) of the primary system.
- Communication nodes that are not controlled include communication nodes (transmission stations) of the primary system (television broadcast system).
- Each of the plurality of communication nodes to be controlled is a communication node (master WSD) of a secondary system that secondarily uses the frequency channel for the primary system.
- the communication system 1 is a communication system related to mobile communication.
- the communication nodes that are not controlled include a macro cell base station.
- Each of the plurality of communication nodes to be controlled is a small cell base station that partially or entirely overlaps the macro cell.
- FIG. 17 is an explanatory diagram for describing an application example of the embodiment of the present disclosure.
- the base station 67 of the macro cell 69, the base station 15 of the small cell 21, and the terminal device 31 that can communicate with the base station are shown. Further, the DB 51 and the communication control apparatus 101 are shown.
- the base station 15 of the small cell 21 performs radio communication using the frequency channel for the base station 67 of the macro cell 69.
- DB51 collects and holds various information.
- the DB 51 collects and holds various pieces of information for determining an available frequency channel for the base station 15 of each small cell 21.
- the DB 51 collects information regarding the base station 67 of the macro cell 69.
- the DB 51 collects information regarding the base station 15 of the small cell 21.
- the DB 50 acquires parameters necessary for referring to interference power.
- the communication control apparatus 101 executes various processes related to the control of the base station 15 of the small cell 21.
- the process includes a process related to determination of an available frequency channel for each base station 15.
- the communication control apparatus 101 can operate in the same manner as the communication control apparatus 100 of each embodiment described above.
- the communication control apparatus 101 can include the same components (for example, an interference information acquisition unit, a classification unit, a channel determination unit, and an interference determination unit) as the communication control apparatus 100 of each embodiment described above.
- the communication control device 100 (and the communication control device 101) may be realized as any type of server such as a tower server, a rack server, or a blade server. Further, at least a part of the components of the communication control apparatus 100 (and the communication control apparatus 101) is inserted into a module (for example, an integrated circuit module configured by one die or a blade server slot) mounted on the server. Card or blade).
- a module for example, an integrated circuit module configured by one die or a blade server slot mounted on the server. Card or blade.
- FIG. 18 is a block diagram illustrating an example of a schematic configuration of a server 700 to which the technology according to the present disclosure can be applied.
- the server 700 includes a processor 701, a memory 702, a storage 703, a network interface 704, and a bus 706.
- the processor 701 may be a CPU (Central Processing Unit) or a DSP (Digital Signal Processor), for example, and controls various functions of the server 700.
- the memory 702 includes a RAM (Random Access Memory) and a ROM (Read Only Memory), and stores programs and data executed by the processor 701.
- the storage 703 may include a storage medium such as a semiconductor memory or a hard disk.
- the network interface 704 is a wired communication interface for connecting the server 700 to the wired communication network 705.
- the wired communication network 705 may be a core network such as EPC (Evolved Packet Core) or a PDN (Packet Data Network) such as the Internet.
- EPC Evolved Packet Core
- PDN Packet Data Network
- the bus 706 connects the processor 701, the memory 702, the storage 703, and the network interface 704 to each other.
- the bus 706 may include two or more buses with different speeds (eg, a high speed bus and a low speed bus).
- the interference information acquisition unit 135, the classification unit 137, and / or the channel determination unit 139 described with reference to FIG.
- a program for causing a processor to function as the interference information acquisition unit 135, the classification unit 137, and / or the channel determination unit 139 (in other words, the processor includes the interference information acquisition unit 135, the classification unit 137, and / or the channel determination unit 139).
- a program for executing the operation may be installed in the server 700, and the processor 701 may execute the program.
- the server 700 includes a module (for example, an information processing device) including a processor 701 and a memory 702, and the interference information acquisition unit 135, the classification unit 137, and / or the channel determination unit 139 is mounted on the module.
- the module may store a program for causing the processor to function as the interference information acquisition unit 135, the classification unit 137, and / or the channel determination unit 139 in the memory 702, and the processor 701 may execute the program. .
- the server 700 or the module may be provided as an apparatus including the interference information acquisition unit 135, the classification unit 137, and / or the channel determination unit 139, and the processor may be provided with the interference information acquisition unit 135, the classification unit 137, and / or Or the said program for functioning as the channel determination part 139 may be provided.
- a readable storage medium storing the program may be provided.
- the interference information acquisition unit 143, the interference determination unit 145, the classification unit 147, and / or the channel determination unit 149 described with reference to FIG. 14 also includes the interference information acquisition unit 135, the classification unit 137, and / or This is the same as the channel determination unit 139.
- the communication control device and each process according to the embodiment of the present disclosure have been described with reference to FIGS. 1 to 18.
- the first interference information indicating the first interference from the communication involving the communication node that is not the control target is acquired for each of the plurality of communication nodes that are the control target.
- second interference information indicating second interference from communication involving another communication node to be controlled is acquired for each of the plurality of communication nodes to be controlled. Then, based on the first interference information and the second interference information, the plurality of communication nodes are classified into a plurality of groups related to determination of frequency channels that can be used by the communication node.
- the plurality of groups are a plurality of groups corresponding to the order in which the frequency channels are determined. More specifically, for example, the plurality of groups include at least a first group and a second group. Up
- a communication node classified into the first group has a higher degree of the first interference with respect to the second interference than a communication node classified into the second group. It is.
- the second group is a group in which the frequency channel is determined after the first group.
- an available frequency channel for the master WSD 10 having relatively weak interference in the secondary system with respect to interference from the primary system is determined first. Then, the available frequency channels for the master WSD 10 with relatively strong interference in the secondary system relative to interference from the primary system are then determined. That is, an available frequency channel for the master WSD 10 that has a smaller influence on interference due to determination of an available frequency channel in the secondary system (for example, variation in the magnitude of interference) is determined first. Then, an available frequency channel for the master WSD 10 that has a greater impact on interference due to the determination of available frequency channels in the secondary system (eg, variation in the magnitude of the interference) is then determined.
- the master WSD 10 that is more influenced by the determination of the available frequency channel in the secondary system, it can be used more appropriately in consideration of the determined available frequency channel for the other master WSD 10. It becomes possible to determine the frequency channel.
- the influence for the master WSD 10 that is less affected by the determination of the available frequency channel in the secondary system, the influence (for example, the magnitude of interference) is determined by determining the available frequency channel for the other master WSD 10. Fluctuations), but the impact is small.
- a more suitable available frequency channel for each master WSD 10 may be determined within the secondary system. As a result, communication of the master WSD 10 that secondarily uses the frequency channel can be improved.
- the frequency channels that can be used for each group are determined in order (that is, the frequency channels that can be used for the subdivided master WSD 10 are determined in order), the number of combinations of the master WSD 10 and the frequency channel candidates is determined. Decrease. As a result, the calculation amount can be suppressed.
- one or more frequency channel candidates having a smaller first interference magnitude among two or more frequency channel candidates can be used for the master WSD 10 classified into the first group. Is determined as the correct frequency channel.
- the master WSD 10 classified into the first group for example, the master WSD 10 having relatively strong interference from the primary system with respect to interference in the secondary system
- the communication quality of the master WSD 10 classified into the first group can be improved, and the communication of the master WSD can be improved.
- Such determination is particularly effective when the magnitude of interference from the primary system varies depending on the frequency channel candidates.
- the second group may be a group in which the frequency channel is determined prior to the first group.
- an available frequency channel for the master WSD 10 having relatively strong interference in the secondary system with respect to interference from the primary system is determined first. Then, an available frequency channel for the master WSD 10 with relatively weak interference in the secondary system relative to interference from the primary system is determined.
- an available frequency channel is determined, and then the interference to the communication of the master WSD 10 is reduced. It is possible to determine available frequency channels for the master WSD. Thus, a more suitable available frequency channel for each master WSD 10 may be determined within the secondary system. As a result, communication of the master WSD 10 that secondarily uses the frequency channel can be improved.
- the frequency channels that can be used for each group are determined in order (that is, the frequency channels that can be used for the subdivided master WSD 10 are determined in order), the number of combinations of the master WSD 10 and the frequency channel candidates is determined. Decrease. As a result, the calculation amount can be suppressed.
- one or more frequency channel candidates with a smaller third interference magnitude to the one or more master WSDs 10 classified into the second group are master WSDs 10 classified into the first group. May be determined as the frequency channel.
- the master WSD 10 classified into the second group for example, the master WSD 10 having relatively strong interference in the secondary system with respect to interference from the primary system
- interference in the secondary system is further reduced. It becomes possible to do. Therefore, the communication quality of the master WSD 10 classified into the second group can be improved, and the communication of the master WSD can be improved.
- the radio resource may be a radio resource other than the frequency channel.
- the radio resource may be a spreading code.
- the communication node (master WSD) is classified into two groups
- the present disclosure is not limited to such an example.
- the communication node (master WSD) may be classified into three or more groups.
- available frequency channels may be determined in order in each group.
- high priority communication node high priority master WSD
- low priority master WSD low priority communication node
- more types of priorities may be prepared.
- usable frequency channels may be determined in order from a communication node with a higher priority. Then, an available frequency channel for a communication node with a lower priority may be determined based on a determination result of an available frequency channel for a communication node with a higher priority.
- the communication control apparatus may use the specific determination method and another method selectively or in combination.
- the specific determination method when the number of combinations of communication nodes (master WSD) and frequency channel candidates is large, the above specific determination method may be used, and when the number of combinations is small, another method may be used.
- the other method may be, for example, a full search, Greedy algorithm, a local search method, a genetic algorithm, or the like. For each group, a full search, a Greedy algorithm, a local search, a genetic algorithm, or the like may be used.
- the primary system is a television broadcasting system and the secondary system is a communication system that secondarily uses TVWS
- the present disclosure is not limited to such an example.
- the primary system and secondary system may be other types of primary systems and secondary systems.
- the communication control device may be implemented in another device.
- the communication control apparatus may be implemented in the DB.
- the communication control apparatus may be implemented in the regulatory DB.
- the regulatory DB may collect various information from the master WSD, DB, and the like.
- the communication control apparatus may be implemented in the master WSD.
- the master WSD may representatively classify the plurality of master WSDs into a plurality of groups, determine available radio resources (frequency channels), and the like.
- the master WSD controls a plurality of communication nodes subordinate to the master WSD, classifies the plurality of communication nodes into groups, determines available radio resources (frequency channels), and the like. May be.
- one communication control device and one DB manage one area
- the present disclosure is not limited to such an example.
- one communication control device and / or one DB may manage a plurality of areas.
- a plurality of communication control devices and / or a plurality of DBs may manage one area.
- processing steps in the communication control processing of this specification do not necessarily have to be executed in time series in the order described in the flowchart.
- the processing steps in the communication control process may be executed in an order different from the order described in the flowchart, or may be executed in parallel.
- a processor for example, a CPU, a DSP, etc.
- a component of the communication control device for example, an interference information acquisition unit, a classification unit, a channel determination unit, and / or an interference determination.
- a computer program (in other words, a computer program for causing the processor to execute the operation of the components of the communication control device) can be created.
- a storage medium storing the computer program may also be provided.
- An information processing apparatus for example, a finished product or a module for a finished product (a component, a processing circuit, a chip, or the like) including a memory that stores the computer program and one or more processors that can execute the computer program. )
- a method including the operation of the components of the communication control device for example, an interference information acquisition unit, a classification unit, a channel determination unit, and / or an interference determination unit) is also included in the technology according to the present disclosure.
- the first interference information indicating the first interference from the communication involving the communication node that is not the control target, and the communication from the communication involving another communication node that is the control target
- An acquisition unit for acquiring second interference information indicating the second interference Based on the first interference information and the second interference information for the plurality of communication nodes, classify the plurality of communication nodes into a plurality of groups related to determination of radio resources available to the communication node.
- a communication control device comprising: (2) The communication control device according to (1), wherein the plurality of groups are a plurality of groups corresponding to an order in which the radio resources are determined.
- the plurality of groups include at least a first group and a second group;
- the communication node classified into the first group is a communication node having a higher degree of the first interference with respect to the second interference than the communication node classified into the second group.
- the communication control device according to (2).
- the communication control apparatus according to (3), wherein the second group is a group in which the radio resource is determined after the first group.
- the determination unit is configured to select one or more radio resource candidates having a smaller first interference magnitude among the two or more radio resource candidates for the communication nodes classified into the first group.
- the communication control apparatus according to (5) which is determined as a radio resource.
- a decision unit for deciding the radio resource for each of the plurality of communication nodes The determination unit determines the radio resource for each of one or more communication nodes classified into the second group, and based on the determination result of the radio resource in the second group, Determining the radio resource for each of one or more communication nodes classified into a group of The communication control device according to (7).
- the determination unit includes one or more radio resources having a smaller third interference magnitude with the one or more communication nodes classified into the second group among the two or more radio resource candidates.
- the communication control device according to (8) wherein a candidate is determined as the radio resource for a communication node classified into the first group.
- a decision unit for deciding the radio resource for each of the plurality of communication nodes When determining the radio resource for each of the one or more communication nodes classified into the second group, the determining unit determines the communication node having a smaller magnitude of the second interference. Determining a radio resource, and determining the radio resource for a communication node having a larger magnitude of the second interference based on a determination result of the radio resource for the communication node; The communication control apparatus according to any one of (3) to (9).
- the first interference information indicates the first interference in each of two or more radio resource candidates;
- the second interference information indicates the second interference in each of the two or more radio resource candidates;
- the degree of the first interference relative to the second interference corresponds to the number of radio resource candidates in which the magnitude of the first interference is larger than the magnitude of the second interference by a predetermined threshold or more.
- the plurality of communication nodes are communication nodes having higher priority than one or more low priority communication nodes to be controlled,
- the determination unit further determines the radio resource for each of the one or more low priority communication nodes based on a determination result of the radio resource for the plurality of communication nodes.
- the communication control apparatus according to any one of (1) to (13).
- the determination unit determines the radio resource for each of the one or more low priority communication nodes based on a determination result for the predetermined condition.
- the communication control device according to (13).
- the first interference is interference caused by a downlink signal transmitted by the non-control target communication node or an uplink signal transmitted to the non-control target communication node
- the second interference is interference caused by a downlink signal transmitted by the another communication node or an uplink signal transmitted to the another communication node.
- the communication control apparatus according to any one of (1) to (14).
- the interference due to the uplink signal transmitted to the other communication node is caused by the communication node that is the control target in the communication range of the other communication node being transmitted by the transmission node that transmits the uplink signal to the other communication node.
- the communication control device according to (15), wherein the communication control device is interference estimated under the assumption that the signal is present in a close predetermined range or a predetermined position.
- the non-controlled communication node includes a primary system communication node, Each of the plurality of communication nodes is a communication node of a secondary system that secondarily uses radio resources for the primary system.
- the communication control device according to any one of (1) to (16).
- the communication node that is not controlled includes a base station of a macro cell, Each of the plurality of communication nodes is a small cell base station that partially or entirely overlaps the macro cell.
- the communication control device according to any one of (1) to (16). (19) For each of the plurality of communication nodes to be controlled, the first interference information indicating the first interference from the communication involving the communication node that is not the control target, and the communication from the communication involving another communication node that is the control target Obtaining second interference information indicative of second interference; Based on the first interference information and the second interference information for the plurality of communication nodes, classify the plurality of communication nodes into a plurality of groups related to determination of radio resources available to the communication node. And Including a communication control method.
- a memory for storing a predetermined program;
- a processor capable of executing the predetermined program;
- the predetermined program is For each of the plurality of communication nodes to be controlled, the first interference information indicating the first interference from the communication involving the communication node that is not the control target, and the communication from the communication involving another communication node that is the control target Obtaining second interference information indicative of second interference; Based on the first interference information and the second interference information for the plurality of communication nodes, classify the plurality of communication nodes into a plurality of groups related to determination of radio resources available to the communication node. And Is a program for executing Information processing device.
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Abstract
Description
1.通信システムの構成
2.第1の実施形態
2.1.通信制御装置の機能構成
2.2.処理の流れ
2.3.第1の変形例
2.4.第2の変形例
2.5.第3の変形例
3.第2の実施形態
3.1.概略
3.2.通信制御装置の機能構成
3.3.処理の流れ
4.応用例
5.通信制御装置の具体例
6.まとめ
まず、図1~図6を参照して、本開示の実施形態に係る通信システム1の概略的な構成を説明する。図1は、本開示の実施形態に係る通信システム1の概略的な構成の一例を示す説明図である。図1を参照すると、通信システム1は、マスタWSD10、データベース(以下、「DB」と呼ぶ)50、及び通信制御装置100を含む。このように、本実施形態に係る通信システム1は、例えば、TVWSを二次的に利用する二次システムである。
マスタWSD10は、一次システム(テレビジョン放送システム)のための周波数チャネルを二次的に利用する二次システム(通信システム1)の通信ノードである。即ち、マスタWSD10は、一次システム(テレビジョン放送システム)のための周波数チャネルを二次的に利用して無線通信を行う。
DB50は、様々な情報を収集し、保持する。例えば、DB50は、各マスタWSD10についての利用可能な周波数チャネルを決定するための各種情報を収集し、保持する。例えば、DB50は、マスタWSD10、通信制御装置100、レギュラトリデータベース(以下、「レギュラトリDB」と呼ぶ)及び/又は別の通信ノードから、各種情報を収集する。上記レギュラトリDBは、例えば、国又は地域の管理機関が有するDBである。
例えば、DB50は、一次システム(テレビジョン放送システム)に関する情報を収集する。より具体的には、例えば、一次システムに関する当該情報は、一次システムの通信ノード(送信局)に関する情報(例えば、数、位置、アンテナの高さ、送信電力)を含む。また、一次システムに関する当該情報は、一次システムのための周波数チャネルに関する情報(チャネル数、チャネル帯域幅、中心周波数、チャネル毎の許容最大送信電力、送信スペクトラムマスク、等)を含む。また、一次システムに関する当該情報は、一次システムのための周波数チャネルのうちの二次的に利用可能なチャネルに関する情報等を含む。例えば、当該利用可能なチャネルは、利用されていない空きチャネルを含む。また、例えば、当該利用可能なチャネルは、利用されているチャネルであって、一次システムの保護を前提として二次的に利用可能なチャネルを含む。
また、例えば、DB50は、二次システムに関する情報を収集する。より具体的には、例えば、二次システムのマスタWSD10に関する情報(例えば、数、位置、アンテナの高さ、送信電力)を含む。
また、例えば、DB50は、干渉電力の参照に必要なパラメータを取得する。当該パラメータは、例えば、隣接チャネル漏洩比(Adjacent Channel Leakage Ratio:ACLR)、隣接チャネル選択性(Adjacent Channel Selectivity:ACS)、シャドウイングマージン、フェージングマージン、及び/又は保護比率(Protection Ratio:PR)を含む。
通信制御装置100は、マスタWSD10の制御に関する様々な処理を実行する。例えば、当該処理は、各マスタWSD10についての利用可能な周波数チャネルの決定に関する処理を含む。
図3を参照して、通信システム1における情報の流れの一例を説明する。図3は、本開示の実施形態に係る通信システム1における情報の流れの一例を説明するためのシーケンス図である。
図4を参照して、一次システムであるテレビジョン放送システムと、二次システムである通信システム1との配置関係の例を説明する。
上述したように、二次システムである通信システム1では、各マスタWSD10についての利用可能な周波数チャネルが決定される。以下、図5及び図6を参照して、各マスタWSD10についての利用可能な周波数チャネルの決定の例の具体例を説明する。
続いて、図7~図12を参照して、本開示の第1の実施形態を説明する。本開示の第1の実施形態によれば、より少ない計算量で、制御対象外の通信ノードが関与する通信からの干渉がある環境下で無線リソース(周波数チャネル)を利用する通信ノードの通信を改善することが可能となる。
図7~図9を参照して、第1の実施形態に係る通信制御装置100-1の構成の一例を説明する。図7は、第1の実施形態に係る通信制御装置100-1の構成の一例を示すブロック図である。図7を参照すると、通信制御装置100-1は、通信部110、記憶部120及び制御部130を備える。
通信部110は、他の装置と通信する。例えば、通信部110は、DB50及びマスタWSD10と通信する。
記憶部120は、通信制御装置100-1の動作のためのプログラム及びデータを記憶する。例えば、記憶部120は、DB50から取得した情報を記憶する。
制御部130は、通信制御装置100-1の様々な機能を提供する。制御部130は、集合決定部131、干渉推定部133、干渉情報取得部135、分類部137及びチャネル決定部139を含む。
集合決定部131は、マスタWSD10の集合40を決定する。
干渉推定部133は、制御対象の複数のマスタWSD10の各々についての干渉を推定する。当該複数のマスタWSD10の各々は、一次システムのための周波数チャネルを二次的に利用する二次システムである通信システム1のマスタWSD10である。例えば、上記複数のマスタWSD10は、同一の集合40に含まれるマスタWSD10であり、干渉推定部133は、決定された集合40ごとに上記干渉を推定する。
第1に、干渉推定部133は、上記複数のマスタWSD10の各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を推定する。
例えば、上記制御対象外の通信ノードは、通信制御装置100-1による制御の対象ではない通信ノードを含む。
上記第1の干渉は、上記制御対象外の通信ノードにより送信されるダウンリンク信号、又は上記制御対象外の通信ノードへ送信されるアップリンク信号による干渉である。例えば、上記第1の干渉は、テレビジョン放送システムの送信局により送信されるダウンリンク信号による干渉を含む。
---周波数チャネル候補ごとの干渉の推定
干渉推定部133は、上記複数のマスタWSD10の各々について、2つ以上の周波数チャネル候補の各々における上記第1の干渉を推定する。当該2つ以上の周波数チャネル候補は、一次システムのための周波数チャネルのうちの、通信システム1が二次的に利用可能な周波数チャネルである。
また、干渉推定部133は、上記第1の干渉として、例えば、干渉信号の受信電力値を推定する。例えば、一次システムの通信ノードが関与する通信からの干渉の電力値(即ち、マスタWSD10における、テレビジョン放送システムの送信局の送信信号(干渉信号)の受信電力値)が、以下のように表される。
第2に、干渉推定部133は、制御対象の上記複数のマスタWSD10の各々について、制御対象の別の通信ノードが関与する通信からの第2の干渉を推定する。
例えば、制御対象の上記別の通信ノードは、通信制御装置100-1による制御の対象である通信ノードである。
上記第2の干渉は、上記別の通信ノードにより送信されるダウンリンク信号、又は上記別の通信ノードへ送信されるアップリンク信号による干渉である。例えば、上記第2の干渉は、干渉が推定されるマスタWSD以外の別のマスタWSD10により送信されるダウンリンク信号による干渉、又は、干渉が推定されるマスタWSD以外の別のマスタWSD10へ送信されるアップリンク信号による干渉を含む。
---周波数チャネル候補ごとの干渉の推定
干渉推定部133は、上記複数のマスタWSD10の各々について、2つ以上の周波数チャネル候補の各々における上記第2の干渉を推定する。当該2つ以上の周波数チャネル候補は、一次システムのための周波数チャネルのうちの、通信システム1が二次的に利用可能な周波数チャネルである。また、ここでは、上記2つ以上の周波数チャネル候補は、2つ以上の周波数チャネル候補である。即ち、2つ以上の周波数チャネル候補の各々における上記第2の干渉が推定される。
また、例えば、干渉推定部133は、上記第2の干渉を算出するために、制御対象の複数のマスタWSD10の各々により利用される周波数チャネルを仮設定する。
また、個々の周波数チャネル候補における上記第2の干渉は、まず、制御対象の上記別の通信ノード(別のマスタWSD10)の各々が関与する通信からの干渉を推定し、上記別の通信ノードの各々について推定された当該干渉を合計することにより、推定される。
(1)マスタWSD10の送信のみからの干渉(ダウンリンク信号のみによる干渉)
(2)スレーブWSD30の送信のみからの干渉(アップリンク信号のみによる干渉)
(3)マスタWSD10の送信及びスレーブWSD30の送信からの干渉(ダウンリンク信号及びアップリンク信号による干渉)
---電力値の推定
また、干渉推定部133は、上記第2の干渉として、例えば、干渉信号の受信電力値を推定する。例えば、制御対象の別のマスタWSD10が関与する通信からの干渉の電力値(即ち、マスタWSD10における、別のマスタWSD10からのダウンリンク信号及び/又は別のマスタWSD10へのアップリンク信号(干渉信号)の受信電力値)が、以下のように表される。
-第1の干渉情報
干渉情報取得部135は、制御対象の複数のマスタWSD10の各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報を取得する。例えば、上記複数のマスタWSD10は、同一の集合40に含まれるマスタWSD10であり、干渉推定部133は、決定された集合40ごとに上記第1の干渉情報を取得する。
また、干渉情報取得部135は、制御対象の複数のマスタWSD10の各々について、制御対象の別の通信ノードが関与する通信からの第2の干渉を示す第2の干渉情報を取得する。例えば、上記複数のマスタWSD10は、同一の集合40に含まれるマスタWSD10であり、干渉推定部133は、決定された集合40ごとに上記第2の干渉情報を取得する。
分類部137は、制御対象の上記複数のマスタWSD10についての上記第1の干渉情報及び上記第2の干渉情報に基づいて、マスタWSD10が利用可能な周波数チャネルの決定に関連する複数のグループに、上記複数のマスタWSD10を分類する。また、例えば、上記複数のマスタWSD10は、同一の集合40に含まれるマスタWSD10であり、分類部137は、決定された集合40ごとにマスタWSD10を分類する。
チャネル決定部139は、制御対象の上記複数のマスタWSD10の各々についての利用可能な周波数チャネルを決定する。例えば、上記複数のマスタWSD10は、同一の集合40に含まれるマスタWSD10であり、干渉推定部133は、決定された集合40ごとにマスタWSD10を分類する。
例えば、チャネル決定部139は、上記第1のグループに分類される1つ以上のマスタWSD10の各々についての上記周波数チャネルを決定する。また、チャネル決定部139は、上記第1のグループにおける上記周波数チャネルの決定結果に基づいて、上記第2のグループに分類される1つ以上のマスタWSD10の各々についての上記周波数チャネルを決定する。
上述したように、上記第1のグループに分類されるマスタWSD10は、上記第2のグループに分類されるマスタWSD10と比べて、上記第2の干渉に対する上記第1の干渉の程度がより大きいマスタWSD10である。
上述したように、上記第2のグループに分類されるマスタWSD10は、上記第2のグループに分類されるマスタWSD10と比べて、上記第2の干渉に対する上記第1の干渉の程度がより小さいマスタWSD10である。
上述したように、チャネル決定部139は、上記第2のグループに分類される上記1つ以上のマスタWSD10の各々についての上記リソース(周波数チャネル)を決定する。例えば、この際に、チャネル決定部139は、上記第2の干渉の大きさがより小さいマスタWSD10についての上記周波数チャネルを決定する。そして、チャネル決定部139は、当該マスタWSD10についての上記周波数チャネルの決定結果に基づいて、上記第2の干渉の大きさがより大きいマスタWSD10についての上記周波数チャネルを決定する。即ち、チャネル決定部139は、第2の干渉の大きさがより小さいマスタWSD10から順に、マスタWSD10についての利用可能な周波数チャネルを決定する。
また、例えば、チャネル決定部139は、2つ以上の周波数チャネル候補のうちの1つ以上の周波数チャネル候補を、上記第2のグループに分類されるマスタWSD10についての利用可能な周波数チャネルとして決定する。そして、当該1つ以上の周波数チャネル候補は、上記第1の干渉及び上記第2の干渉を含む干渉の大きさがより小さい1つ以上の周波数チャネル候補である。
また、例えば、チャネル決定部139は、いずれのグループにも分類されないマスタWSD10についての利用可能な周波数チャネルも決定する。
以上のように、チャネル決定部139は、制御対象の上記複数のマスタWSD10の各々についての利用可能な周波数チャネルを決定する。例えば、その後、チャネル決定部139は、通信部110を介して、各マスタWSD10に、決定された利用可能な周波数チャネルを通知する。
次に、図10を参照して、第1の実施形態に係る通信制御処理を説明する。図10は、第1の実施形態に係る通信制御処理の概略的な流れの一例を示すフローチャートである。当該通信制御処理は、マスタWSD10の集合40ごとに実行され得る。
次に、図11を参照して、第1の実施形態の第1の変形例を説明する。
上述したように、制御対象の複数のマスタWSD10が分類される複数のグループは、第1のグループ及び第2のグループを含む。そして、上記第1のグループに分類されるマスタWSD10は、上記第2のグループに分類されるマスタWSD10と比べて、上記第2の干渉に対する上記第1の干渉の程度がより大きいマスタWSD10である。そして、とりわけ上述した第1の実施形態の例では、上記第2のグループは、上記第1のグループよりも後に上記周波数チャネルが決定されるグループである。
分類部137は、制御対象の上記複数のマスタWSD10についての上記第1の干渉情報及び上記第2の干渉情報に基づいて、マスタWSD10が利用可能な周波数チャネルの決定に関連する複数のグループに、上記複数のマスタWSD10を分類する。この点については、第1の実施形態の例において上述したとおりである。
-グループに応じた順序での決定
とりわけ第1の変形例では、チャネル決定部139は、上記第2のグループに分類される1つ以上のマスタWSD10の各々についての上記周波数チャネルを決定する。また、チャネル決定部139は、上記第2のグループにおける上記周波数チャネルの決定結果に基づいて、上記第1のグループに分類される1つ以上のマスタWSD10の各々についての上記周波数チャネルを決定する。
とりわけ第1の変形例では、チャネル決定部139は、上記第1のグループにおける上記周波数チャネルの決定結果に基づくことなく、上記第2のグループに分類される1つ以上のマスタWSD10の各々についての上記周波数チャネルを決定する。この点を除き、第1の実施形態の例として上述したとおりである。
とりわけ第1の変形例では、上述したように、チャネル決定部139は、上記第2のグループにおける上記周波数チャネルの決定結果に基づいて、上記第1のグループに分類される1つ以上のマスタWSD10の各々についての上記周波数チャネルを決定する。
次に、図11を参照して、第1の実施形態の第1の変形例に係る通信制御処理を説明する。図11は、第1の実施形態の第1の変形例に係る通信制御処理の概略的な流れの一例を示すフローチャートである。当該通信制御処理は、マスタWSD10の集合40ごとに実行され得る。
次に、図12を参照して、第1の実施形態の第2の変形例を説明する。
上述した第1の実施形態の例では、制御対象外の通信ノードは、一次システムの通信ノードを含む。一方、第1の実施形態の第2の変形例では、制御対象外の通信ノードは、一次システムの通信ノードに加えて、別の通信ノードもさらに含む。
-制御対象外の通信ノードが関与する通信からの第1の干渉
第1に、干渉推定部133は、上記複数のマスタWSD10の各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を推定する。
例えば、上記制御対象外の通信ノードは、通信制御装置100-1による制御の対象ではない通信ノードを含む。
次に、第1の実施形態の第3の変形例を説明する。
上述した第1の実施形態の例では、制御対象の別の通信ノードは、二次システムである通信システム1の別のマスタWSD10を含む。一方、第1の実施形態の第3の変形例では、制御対象の別の通信ノードは、通信システム1の別のマスタWSD10に加えて、別の通信ノードもさらに含む。
-制御対象の別の通信ノードが関与する通信からの第2の干渉
第2に、干渉推定部133は、制御対象の上記複数のマスタWSD10の各々について、制御対象の別の通信ノードが関与する通信からの第2の干渉を推定する。
例えば、制御対象の上記別の通信ノードは、通信制御装置100-1による制御の対象である通信ノードである。
続いて、図13~図16を参照して、本開示の第2の実施形態を説明する。本開示の第2の実施形態によれば、低優先マスタWSDが関与する通信から、高優先マスタWSDが関与する通信への干渉を、抑えることが可能になる。
まず、図13を参照して、本開示の第2の実施形態の概略を説明する。
図14を参照して、第2の実施形態に係る通信制御装置100-2の構成の一例を説明する。図14は、第2の実施形態に係る通信制御装置100-2の構成の一例を示すブロック図である。図14を参照すると、通信制御装置100-2は、通信部110、記憶部120及び制御部140を備える。
干渉推定部141は、より高い優先度の高い高優先マスタWSD11の各々についての干渉と、より低い優先度の低優先マスタWSD13についての干渉とを、別々に算出する。
干渉推定部141は、制御対象の複数の高優先マスタWSD11の各々についての干渉を推定する。例えば、上記複数の高優先マスタWSD11は、同一の集合41に含まれる高優先マスタWSD11であり、干渉推定部141は、決定された集合41ごとに上記干渉を推定する。
第1に、干渉推定部141は、上記複数の高優先マスタWSD11の各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を推定する。干渉推定部141は、第1の実施形態に係る干渉推定部133と同様に、高優先マスタWSD11の各々についての第1の干渉を推定する。
第2に、干渉推定部141は、制御対象の上記複数の高優先マスタWSD11の各々について、制御対象の別の通信ノードが関与する通信からの第2の干渉を推定する。
例えば、制御対象の上記別の通信ノードは、通信制御装置100-2による制御の対象である通信ノードである。
干渉推定部141は、制御対象の複数の低優先マスタWSD13の各々についての干渉を推定する。例えば、上記複数の低優先マスタWSD13は、同一の集合41に含まれる低優先マスタWSD13であり、干渉推定部141は、決定された集合41ごとに上記干渉を推定する。
第1に、干渉推定部141は、上記複数の低優先マスタWSD13の各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を推定する。
例えば、上記制御対象外の通信ノードは、通信制御装置100-1による制御の対象ではない通信ノードを含む。
上記第1の干渉は、上記制御対象外の通信ノードにより送信されるダウンリンク信号、又は上記制御対象外の通信ノードへ送信されるアップリンク信号による干渉である。例えば、上記第1の干渉は、テレビジョン放送システムの送信局により送信されるダウンリンク信号による干渉を含む。また、上記第1の干渉は、高優先WSD11により送信されるダウンリンク信号、又は高優先WSD11へ送信されるアップリンク信号による干渉を含む。
----周波数チャネル候補ごとの干渉の推定
干渉推定部141は、上記複数の低優先マスタWSD13の各々について、2つ以上の周波数チャネル候補の各々における上記第1の干渉を推定する。当該2つ以上の周波数チャネル候補は、一次システムのための周波数チャネルのうちの、通信システム1が二次的に利用可能な周波数チャネルである。
また、干渉推定部141は、上記第1の干渉として、例えば、干渉信号の受信電力値を推定する。
第2に、干渉推定部141は、制御対象の上記複数の低優先マスタWSD13の各々について、制御対象の別の通信ノードが関与する通信からの第2の干渉を推定する。
例えば、制御対象の上記別の通信ノードは、通信制御装置100-2による制御の対象である通信ノードである。
-高優先マスタWSD
干渉情報取得部143は、制御対象の複数の高優先マスタWSD11の各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報を取得する。
干渉情報取得部143は、制御対象の複数の低高優先マスタWSD13の各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報を取得する。
与干渉判定部145は、上記複数の低優先マスタWSD13の各々について、上記複数の高優先マスタWSD11が関与する通信への第4の干渉についての所定の条件(以下、「与干渉条件」と呼ぶ)が満たされるかを判定する。
例えば、与干渉判定部145は、上記複数の低優先マスタWSD13の各々について、上記複数の高優先マスタWSD11が関与する通信への第4の干渉を推定する。
そして、与干渉判定部145は、上記複数の低優先マスタWSD13の各々について、上記与干渉条件が満たされるかを判定する。
分類部147は、複数の高優先マスタWSD11と、複数の低優先マスタWSD13とを、別々に分類する。即ち、分類部147は、複数の高優先マスタWSD11を複数のグループに分類する。また、分類部147は、複数の高優先マスタWSD11とは別に、複数の低優先マスタWSD13を複数のグループに分類する。各グループにおいて高優先マスタWSD11と低優先マスタWSD13とが混在するわけではないことに留意すべきである。
分類部147は、制御対象の複数の高優先マスタWSD11についての上記第1の干渉情報及び上記第2の干渉情報に基づいて、高優先マスタWSD11が利用可能な周波数チャネルの決定に関連する複数のグループに、上記複数の高優先マスタWSD11を分類する。また、例えば、上記複数の高優先マスタWSD11は、同一の集合41に含まれる高優先マスタWSD11であり、分類部147は、決定された集合41ごとに高優先マスタWSD11を分類する。
分類部147は、制御対象の複数の低優先マスタWSD13についての上記第1の干渉情報及び上記第2の干渉情報に基づいて、低優先マスタWSD13が利用可能な周波数チャネルの決定に関連する複数のグループに、上記複数の低優先マスタWSD13を分類する。また、例えば、上記複数の低優先マスタWSD13は、同一の集合41に含まれる低優先マスタWSD13であり、分類部147は、決定された集合41ごとに低優先マスタWSD13を分類する。
チャネル決定部149は、制御対象の複数のマスタWSDの各々についての利用可能な周波数チャネルを決定する。
第2の実施形態では、チャネル決定部149は、まず、制御対象の複数の高優先マスタWSD11の各々についての利用可能な周波数チャネルを決定する。そして、チャネル決定部149は、上記複数の高優先マスタWSD11についての利用可能な周波数チャネルの決定結果に基づいて、上記複数の低優先マスタWSD13の各々についての利用可能な周波数チャネルをさらに決定する。
チャネル決定部149は、制御対象の複数の高優先マスタWSD11の各々についての利用可能な周波数チャネルを決定する。
チャネル決定部149は、制御対象の複数の低優先マスタWSD13の各々についての利用可能な周波数チャネルを決定する。
また、第2の実施形態では、例えば、チャネル決定部149は、与干渉条件についての判定結果に基づいて、上記複数の低優先マスタWSD13の各々についての利用可能な周波数チャネルを決定する。
次に、図15及び図16を参照して、第2の実施形態に係る通信制御処理を説明する。
図15は、第2の実施形態に係る通信制御処理の概略的な流れの一例を示すフローチャートである。当該通信制御処理は、マスタWSDの集合41ごとに実行され得る。
図16は、低優先マスタWSD13についての周波数チャネル決定処理(S600)の概略的な流れの一例を示すフローチャートである。
続いて、図17を参照して、本開示の実施形態の応用例を説明する。
本開示に係る技術は、様々な製品へ応用可能である。例えば、通信制御装置100(及び通信制御装置101)は、タワーサーバ、ラックサーバ、又はブレードサーバなどのいずれかの種類のサーバとして実現されてもよい。また、通信制御装置100(及び通信制御装置101)の少なくとも一部の構成要素は、サーバに搭載されるモジュール(例えば、1つのダイで構成される集積回路モジュール、又はブレードサーバのスロットに挿入されるカード若しくはブレード)として実現されてもよい。
ここまで、図1~図18を用いて、本開示の実施形態に係る通信制御装置及び各処理を説明した。本開示に係る実施形態によれば、制御対象の複数の通信ノードの各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報が取得される。また、制御対象の複数の通信ノードの各々について、制御対象の別の通信ノードが関与する通信からの第2の干渉を示す第2の干渉情報が取得される。そして、上記第1の干渉情報及び上記第2の干渉情報に基づいて、通信ノードが利用可能な周波数チャネルの決定に関連する複数のグループに、上記複数の通信ノードが分類される。
(1)
制御対象の複数の通信ノードの各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報、及び、制御対象の別の通信ノードが関与する通信からの第2の干渉を示す第2の干渉情報を取得する取得部と、
前記複数の通信ノードについての前記第1の干渉情報及び前記第2の干渉情報に基づいて、通信ノードが利用可能な無線リソースの決定に関連する複数のグループに、前記複数の通信ノードを分類する分類部と、
を備える通信制御装置。
(2)
前記複数のグループは、前記無線リソースが決定される順序に対応する複数のグループである、前記(1)に記載の通信制御装置。
(3)
前記複数のグループは、少なくとも、第1のグループ及び第2のグループを含み、
前記第1のグループに分類される通信ノードは、前記第2のグループに分類される通信ノードと比べて、前記第2の干渉に対する前記第1の干渉の程度がより大きい通信ノードである、
前記(2)に記載の通信制御装置。
(4)
前記第2のグループは、前記第1のグループよりも後に前記無線リソースが決定されるグループである、前記(3)に記載の通信制御装置。
(5)
前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記決定部は、前記第1のグループに分類される1つ以上の通信ノードの各々についての前記無線リソースを決定し、前記第1のグループにおける前記無線リソースの決定結果に基づいて、前記第2のグループに分類される1つ以上の通信ノードの各々についての前記無線リソースを決定する、
前記(4)に記載の通信制御装置。
(6)
前記決定部は、2つ以上の無線リソース候補のうちの、前記第1の干渉の大きさがより小さい1つ以上の無線リソース候補を、前記第1のグループに分類される通信ノードについての前記無線リソースとして決定する、前記(5)に記載の通信制御装置。
(7)
前記第2のグループは、前記第1のグループよりも先に前記無線リソースが決定されるグループである、前記(3)に記載の通信制御装置。
(8)
前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記決定部は、前記第2のグループに分類される1つ以上の通信ノードの各々についての前記無線リソースを決定し、前記第2のグループにおける前記無線リソースの決定結果に基づいて、前記第1のグループに分類される1つ以上の通信ノードの各々についての前記無線リソースを決定する、
前記(7)に記載の通信制御装置。
(9)
前記決定部は、2つ以上の無線リソース候補のうちの、前記第2のグループに分類される前記1つ以上の通信ノードへの第3の干渉の大きさがより小さい1つ以上の無線リソース候補を、前記第1のグループに分類される通信ノードについての前記無線リソースとして決定する、前記(8)に記載の通信制御装置。
(10)
前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記決定部は、前記第2のグループに分類される前記1つ以上の通信ノードの各々についての前記無線リソースを決定する際に、前記第2の干渉の大きさがより小さい通信ノードについての前記無線リソースを決定し、当該通信ノードについての当該無線リソースの決定結果に基づいて、前記第2の干渉の大きさがより大きい通信ノードについての前記無線リソースを決定する、
前記(3)~(9)のいずれか1項に記載の通信制御装置。
(11)
前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記決定部は、2つ以上の無線リソース候補のうちの、前記第1の干渉及び前記第2の干渉を含む干渉の大きさがより小さい1つ以上の無線リソース候補を、前記第2のグループに分類される通信ノードについての前記無線リソースとして決定する、
前記(3)~(10)のいずれか1項に記載の通信制御装置。
(12)
前記第1の干渉情報は、2つ以上の無線リソース候補の各々における前記第1の干渉を示し、
前記第2の干渉情報は、前記2つ以上の無線リソース候補の各々における前記第2の干渉を示し、
前記第2の干渉に対する前記第1の干渉の前記程度は、前記第1の干渉の大きさが前記第2の干渉の大きさよりも所定の閾値以上大きい無線リソース候補の数に対応する、
前記(3)~(11)のいずれか1項に記載の通信制御装置。
(13)
前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記複数の通信ノードは、制御対象の1つ以上の低優先通信ノードよりも優先度の高い通信ノードであり、
前記決定部は、前記複数の通信ノードについての前記無線リソースの決定結果に基づいて、前記1つ以上の低優先通信ノードの各々についての前記無線リソースをさらに決定する、
前記(1)~(13)のいずれか1項に記載の通信制御装置。
(14)
前記1つ以上の低優先通信ノードの各々について、前記複数の通信ノードが関与する通信への第4の干渉についての所定の条件が満たされるかを判定する判定部、をさらに備え、
前記決定部は、前記所定の条件についての判定結果に基づいて、前記1つ以上の低優先通信ノードの各々についての前記無線リソースを決定する、
前記(13)に記載の通信制御装置。
(15)
前記第1の干渉は、前記制御対象外の通信ノードにより送信されるダウンリンク信号、又は前記制御対象外の通信ノードへ送信されるアップリンク信号による干渉であり、
前記第2の干渉は、前記別の通信ノードにより送信されるダウンリンク信号、又は前記別の通信ノードへ送信されるアップリンク信号による干渉である、
前記(1)~(14)のいずれか1項に記載の通信制御装置。
(16)
前記別の通信ノードへ送信されるアップリンク信号による前記干渉は、当該別の通信ノードへ当該アップリンク信号を送信する送信ノードが前記別の通信ノードの通信範囲のうちの制御対象の通信ノードにより近い所定の範囲又は所定の位置に存在するという仮定の下で推定される干渉である、前記(15)に記載の通信制御装置。
(17)
前記制御対象外の通信ノードは、一次システムの通信ノードを含み、
前記複数の通信ノードの各々は、前記一次システムのための無線リソースを二次的に利用する二次システムの通信ノードである、
前記(1)~(16)のいずれか1項に記載の通信制御装置。
(18)
前記制御対象外の通信ノードは、マクロセルの基地局を含み、
前記複数の通信ノードの各々は、前記マクロセルと一部又は全体で重なるスモールセルの基地局である、
前記(1)~(16)のいずれか1項に記載の通信制御装置。
(19)
制御対象の複数の通信ノードの各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報、及び、制御対象の別の通信ノードが関与する通信からの第2の干渉を示す第2の干渉情報を取得することと、
前記複数の通信ノードについての前記第1の干渉情報及び前記第2の干渉情報に基づいて、通信ノードが利用可能な無線リソースの決定に関連する複数のグループに、前記複数の通信ノードを分類することと、
を含む通信制御方法。
(20)
所定のプログラムを記憶するメモリと、
前記所定のプログラムを実行可能なプロセッサと、
を備え、
前記所定のプログラムは、
制御対象の複数の通信ノードの各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報、及び、制御対象の別の通信ノードが関与する通信からの第2の干渉を示す第2の干渉情報を取得することと、
前記複数の通信ノードについての前記第1の干渉情報及び前記第2の干渉情報に基づいて、通信ノードが利用可能な無線リソースの決定に関連する複数のグループに、前記複数の通信ノードを分類することと、
を実行させるためのプログラムである、
情報処理装置。
10 マスタWSD(White Space Device)
11 高優先マスタWSD
13 低優先マスタWSD
15 (スモールセルの)基地局
20 通信範囲
21 スモールセル
30 スレーブWSD
31 端末装置
50、51 DB(Data Base)
60 送信局
67 (マクロセルの)基地局
69 マクロセル
100、101 通信制御装置
135、143 干渉情報取得部
137、147 分類部
139、149 チャネル決定部
145 与干渉判定部
Claims (20)
- 制御対象の複数の通信ノードの各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報、及び、制御対象の別の通信ノードが関与する通信からの第2の干渉を示す第2の干渉情報を取得する取得部と、
前記複数の通信ノードについての前記第1の干渉情報及び前記第2の干渉情報に基づいて、通信ノードが利用可能な無線リソースの決定に関連する複数のグループに、前記複数の通信ノードを分類する分類部と、
を備える通信制御装置。 - 前記複数のグループは、前記無線リソースが決定される順序に対応する複数のグループである、請求項1に記載の通信制御装置。
- 前記複数のグループは、少なくとも、第1のグループ及び第2のグループを含み、
前記第1のグループに分類される通信ノードは、前記第2のグループに分類される通信ノードと比べて、前記第2の干渉に対する前記第1の干渉の程度がより大きい通信ノードである、
請求項2に記載の通信制御装置。 - 前記第2のグループは、前記第1のグループよりも後に前記無線リソースが決定されるグループである、請求項3に記載の通信制御装置。
- 前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記決定部は、前記第1のグループに分類される1つ以上の通信ノードの各々についての前記無線リソースを決定し、前記第1のグループにおける前記無線リソースの決定結果に基づいて、前記第2のグループに分類される1つ以上の通信ノードの各々についての前記無線リソースを決定する、
請求項4に記載の通信制御装置。 - 前記決定部は、2つ以上の無線リソース候補のうちの、前記第1の干渉の大きさがより小さい1つ以上の無線リソース候補を、前記第1のグループに分類される通信ノードについての前記無線リソースとして決定する、請求項5に記載の通信制御装置。
- 前記第2のグループは、前記第1のグループよりも先に前記無線リソースが決定されるグループである、請求項3に記載の通信制御装置。
- 前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記決定部は、前記第2のグループに分類される1つ以上の通信ノードの各々についての前記無線リソースを決定し、前記第2のグループにおける前記無線リソースの決定結果に基づいて、前記第1のグループに分類される1つ以上の通信ノードの各々についての前記無線リソースを決定する、
請求項7に記載の通信制御装置。 - 前記決定部は、2つ以上の無線リソース候補のうちの、前記第2のグループに分類される前記1つ以上の通信ノードへの第3の干渉の大きさがより小さい1つ以上の無線リソース候補を、前記第1のグループに分類される通信ノードについての前記無線リソースとして決定する、請求項8に記載の通信制御装置。
- 前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記決定部は、前記第2のグループに分類される前記1つ以上の通信ノードの各々についての前記無線リソースを決定する際に、前記第2の干渉の大きさがより小さい通信ノードについての前記無線リソースを決定し、当該通信ノードについての当該無線リソースの決定結果に基づいて、前記第2の干渉の大きさがより大きい通信ノードについての前記無線リソースを決定する、
請求項3に記載の通信制御装置。 - 前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記決定部は、2つ以上の無線リソース候補のうちの、前記第1の干渉及び前記第2の干渉を含む干渉の大きさがより小さい1つ以上の無線リソース候補を、前記第2のグループに分類される通信ノードについての前記無線リソースとして決定する、
請求項3に記載の通信制御装置。 - 前記第1の干渉情報は、2つ以上の無線リソース候補の各々における前記第1の干渉を示し、
前記第2の干渉情報は、前記2つ以上の無線リソース候補の各々における前記第2の干渉を示し、
前記第2の干渉に対する前記第1の干渉の前記程度は、前記第1の干渉の大きさが前記第2の干渉の大きさよりも所定の閾値以上大きい無線リソース候補の数に対応する、
請求項3に記載の通信制御装置。 - 前記複数の通信ノードの各々についての前記無線リソースを決定する決定部をさらに備え、
前記複数の通信ノードは、制御対象の1つ以上の低優先通信ノードよりも優先度の高い通信ノードであり、
前記決定部は、前記複数の通信ノードについての前記無線リソースの決定結果に基づいて、前記1つ以上の低優先通信ノードの各々についての前記無線リソースをさらに決定する、
請求項1に記載の通信制御装置。 - 前記1つ以上の低優先通信ノードの各々について、前記複数の通信ノードが関与する通信への第4の干渉についての所定の条件が満たされるかを判定する判定部、をさらに備え、
前記決定部は、前記所定の条件についての判定結果に基づいて、前記1つ以上の低優先通信ノードの各々についての前記無線リソースを決定する、
請求項13に記載の通信制御装置。 - 前記第1の干渉は、前記制御対象外の通信ノードにより送信されるダウンリンク信号、又は前記制御対象外の通信ノードへ送信されるアップリンク信号による干渉であり、
前記第2の干渉は、前記別の通信ノードにより送信されるダウンリンク信号、又は前記別の通信ノードへ送信されるアップリンク信号による干渉である、
請求項1に記載の通信制御装置。 - 前記別の通信ノードへ送信されるアップリンク信号による前記干渉は、当該別の通信ノードへ当該アップリンク信号を送信する送信ノードが前記別の通信ノードの通信範囲のうちの制御対象の通信ノードにより近い所定の範囲又は所定の位置に存在するという仮定の下で推定される干渉である、請求項15に記載の通信制御装置。
- 前記制御対象外の通信ノードは、一次システムの通信ノードを含み、
前記複数の通信ノードの各々は、前記一次システムのための無線リソースを二次的に利用する二次システムの通信ノードである、
請求項1に記載の通信制御装置。 - 前記制御対象外の通信ノードは、マクロセルの基地局を含み、
前記複数の通信ノードの各々は、前記マクロセルと一部又は全体で重なるスモールセルの基地局である、
請求項1記載の通信制御装置。 - 制御対象の複数の通信ノードの各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報、及び、制御対象の別の通信ノードが関与する通信からの第2の干渉を示す第2の干渉情報を取得することと、
前記複数の通信ノードについての前記第1の干渉情報及び前記第2の干渉情報に基づいて、通信ノードが利用可能な無線リソースの決定に関連する複数のグループに、前記複数の通信ノードを分類することと、
を含む通信制御方法。 - 所定のプログラムを記憶するメモリと、
前記所定のプログラムを実行可能なプロセッサと、
を備え、
前記所定のプログラムは、
制御対象の複数の通信ノードの各々について、制御対象外の通信ノードが関与する通信からの第1の干渉を示す第1の干渉情報、及び、制御対象の別の通信ノードが関与する通信からの第2の干渉を示す第2の干渉情報を取得することと、
前記複数の通信ノードについての前記第1の干渉情報及び前記第2の干渉情報に基づいて、通信ノードが利用可能な無線リソースの決定に関連する複数のグループに、前記複数の通信ノードを分類することと、
を実行させるためのプログラムである、
情報処理装置。
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ZA201507935B (en) | 2016-07-27 |
RU2015146929A (ru) | 2017-05-18 |
US20180302174A1 (en) | 2018-10-18 |
EP2996373A4 (en) | 2016-12-21 |
SG11201508962WA (en) | 2015-11-27 |
US10044450B2 (en) | 2018-08-07 |
JP6281569B2 (ja) | 2018-02-21 |
MX2015015107A (es) | 2016-02-11 |
RU2644413C2 (ru) | 2018-02-12 |
US20160006522A1 (en) | 2016-01-07 |
TW201448653A (zh) | 2014-12-16 |
MX352160B (es) | 2017-11-10 |
US10469180B2 (en) | 2019-11-05 |
JPWO2014181580A1 (ja) | 2017-02-23 |
US11595136B2 (en) | 2023-02-28 |
US20210044363A1 (en) | 2021-02-11 |
CN105165049A (zh) | 2015-12-16 |
US10833778B2 (en) | 2020-11-10 |
EP2996373A1 (en) | 2016-03-16 |
JP2018085766A (ja) | 2018-05-31 |
ES2777249T3 (es) | 2020-08-04 |
JP6492334B2 (ja) | 2019-04-03 |
EP2996373B1 (en) | 2020-02-19 |
CN105165049B (zh) | 2019-11-05 |
TWI633804B (zh) | 2018-08-21 |
US20200036452A1 (en) | 2020-01-30 |
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