WO2013153884A1 - 無線システム、無線基地局、及び管理装置 - Google Patents
無線システム、無線基地局、及び管理装置 Download PDFInfo
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- WO2013153884A1 WO2013153884A1 PCT/JP2013/056313 JP2013056313W WO2013153884A1 WO 2013153884 A1 WO2013153884 A1 WO 2013153884A1 JP 2013056313 W JP2013056313 W JP 2013056313W WO 2013153884 A1 WO2013153884 A1 WO 2013153884A1
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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
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/02—Arrangements for increasing efficiency of notification or paging channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a radio system, a radio base station, and a management apparatus that can perform radio communication by sharing a channel between radio base stations.
- Wireless communication is performed in a pre-assigned frequency band, but the bandwidth is becoming tight as the number of wireless devices and data traffic increase in recent years.
- bands allocated with a relatively large space in order to prevent interference between broadcasting stations such as a frequency band for television broadcasting.
- the frequency allocation for digital terrestrial broadcasting in Japan has a bandwidth of 240 MHz, and is divided into 40 physical channels ranging from 13 ch (470 MHz) to 52 ch (710 MHz) each with a 6 MHz width, and is broadcast to each broadcasting station. Allocated.
- FIG. 12 is a part of the channel plan for digital terrestrial broadcasting in Japan, and shows the channels used in each region. For example, in Tokushima, three channels of 34ch, 40ch and 31ch are used, and the remaining 37 channels are not used.
- the number of channels actually used is a part of the number of channels allocated for terrestrial digital broadcasting in advance, and most of the channels are not used and are free channels.
- Non-Patent Document 1 a standard for WRAN (Wireless Regional Area Network) using a television white space is being developed.
- working groups aimed at using the TV white space include 802.11af, 802.15.4m, TD-LTE, etc. in addition to 802.112.
- 802.11af 802.11af
- 802.15.4m 802.11af
- TD-LTE TD-LTE
- 802.112 802.11af
- TD-LTE TD-LTE
- the TDD (Time Division Duplex) method 802.112 does not perform carrier sense every frame, and 802.11af transmits at a specified timing. Even if it is in the middle, transmission will be started, which causes co-channel interference.
- 802.11af is CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance (carrier multiple sense / carrier avoidance) is used, but transmission is started in TTG (Transmit / Receive Transition Gap) and RTG (Receive / Transmit Transition Gap), which are times when there is no radio wave in the TDD method of 802.22. This causes the same channel interference as the 802.22 frame that started transmission after TTG and RTG.
- FIG. 13 is a diagram illustrating a state in which channel interference occurs due to a hidden terminal.
- the wireless base stations AP (Access Point) 1 and AP 2 are operated on the same channel.
- the CPE terminal 6-1 and the CPE terminal 6-2 are close to each other, but the CPE terminal 6-1 exists in the AP1 cell, and the CPE terminal 6-2 exists in the AP2 cell.
- the present invention has been made in view of the above problems, and provides a technique that hardly causes co-channel interference between wireless systems when various wireless systems having different standards share a predetermined frequency band and perform wireless communication. For the purpose.
- a radio system of the present invention includes a plurality of radio base stations that perform radio communication using one channel among a plurality of channels, and a plurality of terminal devices that perform radio communication with the radio base station. And a search means for searching for the terminal device closest to the radio base station for each of one or more of the plurality of channels when determining a channel to be used by the radio base station; And an instruction unit that causes the terminal device searched by the search unit to transmit a notification signal, and the radio base station sets a reception state of the notification signal of the terminal device when determining the channel to be used.
- Channel determining means for determining a channel to be used is provided.
- the channel determination means of the radio base station searches whether or not there are empty channels in the plurality of channels, and when there is an empty channel, determines the channel that uses the empty channel, When there is no channel, based on the received notification signal, the channel of the notification signal or the control signal of the same standard as that of the own station may be determined.
- the channel determination means of the radio base station searches whether or not there are empty channels in the plurality of channels, and when there is an empty channel, determines the channel that uses the empty channel, When there is no channel, based on the received broadcast signal and / or the received control signal from another radio base station, the broadcast signal of the same standard as the own station or the channel of the control signal is used. The channel to be used may be determined.
- the channel determination means of the radio base station determines that the standard is the same as that of the local station when the broadcast signal can be received, and if the standard is different from the local station when the broadcast signal cannot be received. You may judge.
- the radio base station uses the channel of the broadcast signal of the same standard as the local station, the radio base station communicates with another radio base station using the channel via the terminal device that has transmitted the broadcast signal. A setting process for sharing the channel may be performed.
- the radio base station of the present invention includes a plurality of radio base stations that perform radio communication using one of a plurality of channels, a plurality of terminal devices that perform radio communication with the radio base station, and the radio base
- a search unit that searches for the terminal device that is closest to the radio base station for each of one or more of the plurality of channels is searched by the search unit.
- the wireless base station in the wireless system including an instruction unit that causes the terminal device to transmit a notification signal is used based on a reception state of the notification signal of the terminal device when determining the channel to be used.
- Channel determining means for determining a channel is provided.
- the management apparatus of the present invention includes a plurality of radio base stations that perform radio communication using one channel among a plurality of channels, and a plurality of terminal devices that perform radio communication with the radio base station, and
- the base station is a wireless system management device having channel determining means for determining a channel to be used based on a reception state of a broadcast signal transmitted from the terminal device when determining a channel to be used,
- a search unit that searches for the terminal device that is closest to the radio base station for each of one or more of the plurality of channels is searched by the search unit.
- FIG. 1 is a system configuration diagram illustrating an entire wireless system according to an embodiment of the present invention. It is the figure which showed a mode that the newly installed base station shown in FIG. 1 searches for an operation channel from television white space. It is the figure which showed a mode that the newly installed base station shown in FIG. 1 and an existing base station share a radio
- FIG. 1 is a system configuration diagram showing the entire wireless system of the present embodiment.
- the wireless system consists of a network management system (NMS) 1 and a network control system (Network Control System: NCS) 2 and TVWSDB (Television White Space Database) 3, new base station 4, existing base station 5, CPE (Customer Premises or Portable Equipment) terminal 6.
- NMS network management system
- NCS Network Control System
- TVWSDB Television White Space Database
- new base station 4 new base station 4
- existing base station 5 Customer Premises or Portable Equipment
- the network management system 1, the network control system 2, the TVWSDB device 3, the new base station 4, and the existing base station 5 are connected via an IP (Internet Protocol) network 7.
- IP Internet Protocol
- the existing base station 5 and the CPE terminal 6 are connected via radio waves.
- one new base station 4, one existing base station 5, and one CPE terminal 6 are shown. However, there are a plurality of new base stations 4, multiple existing base stations 5 (1 to n). 1 to m: n, where m is a natural number) and a plurality of CPE terminals 6 (1 to l: l are natural numbers) may exist.
- the network management system 1 manages the network, and performs, for example, network security maintenance and performance management of other devices constituting the network.
- the network control system 2 controls QoS (Quality of Service) in the network.
- QoS Quality of Service
- the TVWSDB device 3 has a television white space database (TVWSDB, hereinafter simply referred to as DB), channel information used by the television station for each region, position information of each existing base station 5, and each existing base station 5
- TVWSDB television white space database
- the TV white space channel information used by each of the CPE terminals 6, the position information of each CPE terminal 6, and the channel white space channel information used by each CPE terminal 6 are stored.
- the CPE terminal 6 exists in a cell of any existing base station 5 and performs wireless communication under the centralized control of the existing base station 5. Further, the CPE terminal 6 has a GPS receiver, acquires position information of the own terminal via the GPS receiver, and transmits it to the existing base station 5 that supports the own terminal.
- the existing base station 5 is a base station of a standard (for example, 802.112, 802.11af, 802.15.4m, TD-LTE, etc.) that can use the television white space, and performs wireless communication using the channel of the television white space. Is going. That is, the existing base station 5 performs wireless communication using one of the available channels.
- the existing base station 5 has a GPS receiver, and can acquire the position information of the own station via the GPS receiver. Further, the existing base station 5 performs centralized control of one or more CPE terminals 6 existing in the cell of the own station, and performs wireless communication with the CPE terminals 6 in the cell through a television white space channel. Further, when the existing base station 5 uses the channel of the television white space, the location information of the own station, the location information transmitted from each CPE terminal 6 supported by the own station, and the channel used in the television white space Are registered in the TVWSDB apparatus 3.
- a standard for example, 802.112, 802.11af, 802.15.4m, TD-L
- the newly established base station 4 is a base station that is about to start operation using a channel of a television white space, and performs wireless communication using one of a plurality of available channels.
- the standard of the newly installed base station 4 is 802.22.
- the newly installed base station 4 acquires its own location information via the GPS receiver and notifies the TVWSDB device 3 of the location information.
- the TVWSDB device 3 searches the DB for channel information of the TV white space in the area corresponding to the location information of the new base station 4 and notifies the new base station 4 of the channel information.
- f1 to f4 are notified as channel information of white space that can be used by the newly installed base station 4.
- the TVWSDB device 3 searches the DB for the CPE terminal 6 that is closest to the new base station 4 based on the position information of the new base station 4 for each channel notified to the new base station 4.
- the TVWSDB apparatus 3 searches the DB for the existing base station 5 that uses the same channel as each searched CPE terminal 6, and the CPE terminal 6 that is closest to the new base station 4 in each channel broadcasts the information.
- An instruction is issued to each existing base station 5 having the CPE terminal 6 in the cell so as to transmit a signal (for example, a broadcast signal or a burst signal, here, a CBP burst).
- the TVWSDB apparatus 3 causes the CPE terminals 6-13, 6-21, and 6-41 to make CBP bursts for the existing base stations 5-1, 5-2, and 5-4 of f1, f2, and f4, respectively. Give instructions.
- each existing base station 5 that has received an instruction from the TVWSDB device 3 sets a schedule so that the CPE terminal 6 designated by the TVWSDB device 3 transmits a CBP burst. Then, the scheduled CPE terminal 6 transmits a CBP burst according to the schedule.
- the CBP burst is a burst signal transmitted intermittently, and is transmitted for a time during which the newly installed base station 4 can sufficiently receive the CBP burst.
- the TVWSDB device 3 does not search the DB for the CPE terminal 6 for every channel notified to the new base station 4, but based on the location information of the new base station 4, the CPE of the neighboring area (for example, within a predetermined range)
- the CPE terminal 6 whose location is registered in the terminal 6 or the existing base station 5 may be searched. By searching for every channel, interference due to hidden terminals can be prevented more reliably, while efficiency can be improved by narrowing the search range based on the location information of the newly installed base station 4.
- the TVWSDB device 3 serves as a management device in the wireless system, and when the new base station 4 determines a channel to be used, at least one or more of the white space channels that can be used by the new base station 4 Each time, it functions as a search unit that performs a search process for searching the DB for the CPE terminal 6 that is closest to the new base station 4. Furthermore, the TVWSDB device 3 uses the same channel as each CPE terminal 6 searched by the search means, or searches the existing base station 5 where each CPE terminal 6 is registered from the DB, and uses each channel. The CPE terminal 6 that is closest to the new base station 4 functions as an instruction unit that performs an instruction process for giving an instruction to each existing base station 5 that has the CPE terminal 6 in the cell so that the CBP burst is transmitted.
- the newly installed base station 4 if (1) is an empty channel or (2) is not an empty channel, Check if they are the same standard.
- Whether the new base station 4 determines whether or not the channel is an empty channel is determined by the RSSI (Received Signal) of the channel. Strength Indicator) is measured, and when the RSSI is lower than a predetermined specified value, it is determined that the channel is an empty channel, and when the RSSI is high, it is determined that the channel is a used channel.
- RSSI Received Signal
- the new base station 4 determines whether the new base station 4 which is 802.22 can receive (demodulate) the CBP burst from the CPE terminal 6 on the channel, or the existing base station 5 Control signal from SCH (Superframe Control) (Header: Super frame control header) is received (demodulated), it is determined to be the same standard as the own station. That is, when determining the channel to be used, the new base station 4 determines the channel to be used based on the reception state of the CBP burst and / or the reception state of the control signal of the existing base station 5.
- SCH Superframe Control
- the new base station 4 determines the channel to be used based on the reception state of the CBP burst and / or the reception state of the control signal of the existing base station 5.
- the newly installed base station 4 cannot receive (demodulate) radio waves from a wireless system using a channel whose RSSI is equal to or higher than a predetermined specified value. It is determined that the channel is used in a standard different from that of the own station.
- the new base station 4 receives the radio wave (CBP burst or the like) and demodulates it. Can not do it. Therefore, also in this case, it is regarded as a cell channel of a standard different from that of the own station and is excluded.
- a cell having the same standard as the newly installed base station 4 is a cell to which a radio wave that can be received (demodulated) by the newly installed base station 4 is transmitted, and a cell having a standard different from that of the newly installed base station 4 4 is a cell to which radio waves that cannot be received (demodulated) are transmitted.
- the new base station 4 When the new base station 4 completes the investigation for all the channels notified from the TVWSDB apparatus 3, if there is a channel that is not used by another wireless system based on the investigation result, the new base station 4 designates that channel as the operation channel. Determine as. In the case shown in the figure, the free channel f3 is determined as the operation channel. If there are a plurality of empty channels, the channel with the lowest RSSI is determined as the operation channel of the newly installed base station 4. The low RSSI is because radio waves are clear.
- the newly established base station 4 has a cell of the same standard as its own station based on the investigation result. Determine if it exists. In this case, the newly installed base station 4 does not have a free channel, so the channel is shared with other wireless systems.
- the new base station 4 stops operation when there is no cell with the same standard as its own station. As described above, if wireless systems having different standards use the same channel, co-channel interference is likely to occur.
- the newly installed base station 4 determines the channel of the cell as an operation channel. For example, in the figure, if the existing base station 5-4 is the same 802.22 as the new base station 4, f4 is determined as the operation channel. When there are a plurality of cells having the same standard as the local station, the channel with the highest RSSI among them is determined as the operation channel. Here, the RSSI is high because the new base station 4 which is 802.22 is likely to enter a radio frame in a time division manner.
- the newly installed base station 4 passes the CPE terminal 6-41 that has received the CBP burst at the time of channel investigation, that is, the CPE terminal 6 that is the closest to the own station in the cell of the operation channel. And make adjustments to share the channel with the existing base station 5-4.
- the CPE terminal 6-41 exists in a region where the cell of the newly installed base station 4 and the cell of the existing base station 5-4 overlap.
- the 802.22 standard stipulates that in cognitive radio communication, the new base station 4 and the existing base station 5-4 use the ODFC (On-demand Frame Content) protocol to allocate radio frames when sharing channels. Has been.
- the new base station 4 relays the CPE terminal 6-41 closest to the own station. Communicate. Since the CPE terminal 6-41 is the CPE terminal 6 that is the closest to the new base station 4 in the cell of the channel, the CPE terminal 6-41 can be connected between the new base station 4 and the existing base station 5-4 without causing a hidden terminal problem. Communication can be relayed.
- the sequence for the new base station 4 to share a radio frame of one channel with the existing base station 5 is shown in the 802.22 standard. Specifically, according to the sequence diagram shown in FIG. 4, the newly installed base station 4 and the existing base station 5-4 perform setting processing for sharing the channel via the CPE terminal 6-21.
- step S101 the newly installed base station 4 transmits FC_REQ to the relay destination CPE terminal 6-21.
- step S102 the CPE terminal 6-41 transmits the received FC_REQ to the existing base station 5-4.
- step S103 the existing base station 5-4 that has received FC_REQ transmits FC_RSP to the CPE terminal 6-41.
- step S104 the CPE terminal 6-41 transmits FC_RSP to the newly installed base station 4.
- step S105 the newly installed base station 4 transmits FC_ACK to the CPE terminal 6-41.
- step S106 the CPE terminal 6-41 transmits FC_ACK to the existing base station 5-4.
- step S107 the existing base station 5-4 transmits FC_REL to the CPE terminal 6-41.
- step S108 the CPE terminal 6-41 transmits FC_REL to the newly installed base station 4 and ends the process.
- the existing base station 5-4 shifts from the normal mode in which the channel is used independently to the self-coexistence mode in which the channel is shared, and shares the channel with the newly installed base station 4.
- FIG. 5 is a diagram showing a frame structure of 802.22
- FIG. 6 is a diagram showing a state in which a newly installed base station 4 and an existing base station 5-4 share a channel and transmit frames in a time division manner.
- the newly installed base station 4 and the existing base station 5-4 perform frame transmission alternately in a time-sharing manner by 10 msec.
- the new base station 4 may interrupt a channel that is already shared by a plurality of existing base stations 5.
- the CPE terminal 6 that is closest to the newly installed base station 4 for each channel transmits a CBP burst.
- the existing base station 5 transmits a CBP burst, there is a possibility that the CBP burst may not reach the base station of the adjacent cell, resulting in a hidden terminal problem. This is the same when the existing base station 5 transmits only the SCH.
- the maximum number of CPE terminals that the existing base station 5 can support is 512. It takes about 5.12 seconds at a maximum for all the CPE terminals 6 to finish transmitting the CBP burst. Also, in this case, the CPE terminal 6 that is near the existing base station 5 and close to the center of the cell also transmits a CBP burst, which is inefficient for the purpose of teaching the existence of the cell to the surroundings. is there.
- a CPE terminal 6 that is far from the existing base station 5 (for example, a CPE terminal 6 having a low reception level of broadcast information transmitted by the existing base station 5 or a CPE terminal 6 having a large delay due to 802.22 Ranging).
- the CPE terminals 6 only need to be uniformly distributed in the cells of the existing base station 5, but generally, the CPE terminals 6 are rarely uniformly distributed due to geographical influences as shown in FIG.
- the TVWSDB device 3 causes the CPE terminal that is closest to the new base station 4 in each channel of the TV white space corresponding to the location information of the new base station 4 (in each existing base station 5 cell). 6 and only this CPE terminal 6 is instructed to transmit a CBP burst.
- the new base station 4 finds a channel used by the same wireless system as the standard of its own station, and sets the channel with the existing base station 5 via the CPE terminal 6 that has received the CBP burst. Share.
- the newly installed base station 4 can reliably detect the presence of an adjacent cell, and can eliminate a hidden terminal and prevent co-channel interference.
- step S201 the newly installed base station 4 receives the position information of its own station via the GPS receiver.
- step S202 the new base station 4 transmits a REQUEST message storing the location information and the time at that time to the TVWSDB device 3.
- FIG. 9 shows the structure of the REQUEST message.
- the location information of the newly installed base station 4 is stored in the Location Data String portion, and the time information is stored in the Timestamp portion.
- the TVWSDB apparatus 3 that has received the REQUEST message searches the DB for channels of a TV white space that can be used in the area corresponding to the location information of the newly installed base station 4 in step S203.
- the TVWSDB apparatus 3 transmits an INDICATION message storing channel information of the searched TV white space to the newly installed base station 4.
- FIG. 10 is a diagram showing the structure of the INDICATION message.
- the INDICATION message includes a Number of Cannels Available portion indicating the number of channels that can be used and channel information of a usable TV white space.
- step S ⁇ b> 205 the TVWSDB apparatus 3 determines that the CPE terminal 6 using the channel exists for each channel of the usable TV white space notified to the new base station 4.
- the CPE terminal 6 having the closest distance to the newly installed base station 4 is searched from the DB.
- step S206 the TVWSDB apparatus 3 searches for the existing base station 5 that uses the same channel as the searched CPE terminal 6, that is, the existing base station 5 that has the CPE terminal 6 in the cell.
- steps S207 and S208 the TVWSDB apparatus 3 instructs the existing base station 5 of each channel so that the CPE terminal 6 closest to the new base station 4 in each channel transmits the CBP burst.
- existing base stations 5 that have received an instruction from the TVWSDB device 3 have both the same standard as the new base station 4 and different standards.
- the existing base stations 5-1 and 5-m perform scheduling so that the CPE terminals 6-1 and 6-1 that are closest to the new base station 4 transmit burst signals, respectively.
- the CPE terminals 6-1 and 6-1 scheduled by the existing base station 5 (CPE terminals closest to the new base station 4) transmit the CBP burst according to the schedule.
- step S213 the newly installed base station 4 performs an operation channel determination process based on the channel white space channel information notified from the TVWSDB device 3.
- the operation channel determination process will be described later.
- step S214 the newly installed base station 4 registers the determined operation channel in the TVWSDB apparatus 3.
- step S215 the new base station 4 starts operation with the determined operation channel, and ends this process.
- step S301 the newly installed base station 4 increments the counter i by 1 in step S302.
- step S303 the new base station 4 determines whether Number Of Channels Available ⁇ i, that is, whether the counter value exceeds the number of usable white space channels notified from the TVWSDB device 3.
- step S304 the newly installed base station 4 performs synth setting in step S304.
- the frequency is adjusted to the radio frequency of the usable i-th channel notified from the TVWSDB device 3.
- step S305 the newly installed base station 4 performs RSSI (received electric field strength) measurement at the frequency.
- the new base station 4 determines whether the measured RSSI is larger than a predetermined specified value indicated by, for example, a standard.
- step S308 the newly installed base station 4 stores the channel as an empty channel in a memory (not shown) (for example, a measurement result table) and returns the process to step S302.
- a memory not shown
- a measurement result table for example, a measurement result table
- step S306 that is, if the channel is being used by the wireless system of any existing base station 5 and CPE terminal 6, in step S307, the new base station 4 Whether or not is 802.22. Specifically, the new base station 4 determines whether it can receive the SCH transmitted by the existing base station 5 and the CBP burst transmitted by the CPE terminal 6 on the channel, and if it can be received, it is 802.22, and if it cannot be received, it is not 802.22. Is determined.
- step S308 the newly installed base station 4 stores the channel information, the RSSI of the channel, and the investigation result as to whether or not the cell is an 802.22 cell as measurement results in a memory (not shown). That is, the channel information of each channel, the RSSI of the channel, whether it is an empty channel, and whether it is an 802.22 cell when it is not an empty channel are stored as measurement results.
- step S302 repeats the processing from step S302 to step S308 until Number Of Channels Available ⁇ i in step S303.
- step S309 the new base station 4 searches for a free channel based on the stored measurement result.
- step S310 the newly installed base station 4 determines whether there is an empty channel for the search result.
- step S315 the newly installed base station 4 determines the channel having the lowest RSSI among the available channels as the operation channel based on the measurement result, and ends this processing.
- the channel with the lower RSSI is a channel with clearer radio waves.
- step S311 the new base station 4 searches for an 802.22 cell based on the measurement result.
- step S312 the newly installed base station 4 determines whether there is an 802.122 cell in the search result.
- step S314 the newly installed base station 4 determines the channel having the highest RSSI among the existing 802.22 cells based on the measurement result, and ends this processing. In this case, the newly installed base station 4 shares this channel with the existing base station 5 and uses it. At this time, a channel having a higher RSSI is more likely to be entered in a time-division manner. Conversely, a channel having a lower RSSI has a poor exchange of the CBP protocol for sharing the channel between the newly installed base station 4 and the existing base station 5. It becomes. It has been described that when the SCH from the existing base station 5 can be received in step S307, it is stored as the same IEEE802.22 base station (step S308).
- step S314 When it is determined in step S314 that the same channel as the existing base station 5 that has received the SCH is set as the operating frequency, the existing base station 5 and the new base station 4 are shown in FIG. As described above, the process for sharing the wireless channel via the CPE terminal 6 is not performed, but the process is directly performed without using the CPE terminal 6.
- step S312 if No in step S312, that is, if there is no 802.22 cell, the newly installed base station 4 is suspended in step S313, and the process is terminated.
- the TVWSDB apparatus 3 searches for the CPE terminal 6 that is closest to the new base station 4 in each channel corresponding to the position information of the new base station 4, and only this CPE terminal 6 An instruction to transmit a CBP burst is given. Then, when there is no empty channel, the newly installed base station 4 finds a channel used by the same wireless system as the standard of the own station, and establishes the existing base station 5 via the CPE terminal 6 that has received the CBP burst. Share the channel. As a result, the newly installed base station 4 can reliably detect the presence of an adjacent cell, and can eliminate a hidden terminal and prevent co-channel interference.
- a radio system of the present invention includes a plurality of radio base stations that perform radio communication using at least one channel among a plurality of channels, and a plurality of terminal devices that perform radio communication with the radio base station.
- search for the terminal device having the closest distance to the radio base station for each of one or more channels of the plurality of channels Search means, and instruction means for causing the terminal device searched by the search means to transmit a notification signal, wherein the radio base station determines the channel to be used when determining the channel to be used.
- Channel determining means for determining a channel to be used on the basis of the reception state is provided.
- the channel determination means of the radio base station searches whether or not there are empty channels in the plurality of channels, and when there is an empty channel, determines the channel that uses the empty channel. However, when there is no vacant channel, the channel of the broadcast signal or the control signal of the same standard as that of the own station may be determined based on the received broadcast signal.
- the channel determining means of the radio base station searches whether or not there are empty channels in the plurality of channels, and if there is an empty channel, determines the channel that uses the empty channel. However, when there is no empty channel, based on the received broadcast signal and / or the received control signal from another radio base station, the broadcast signal of the same standard as the own station or the control signal The channel may be determined to be used.
- the channel determining means of the radio base station determines that the standard is the same as that of the local station when the broadcast signal can be received, and the standard with the local station when the broadcast signal cannot be received. May be determined to be different.
- the radio base station uses the channel of the broadcast signal of the same standard as that of the own station, the radio base station transmits another radio using the channel via the terminal device that has transmitted the broadcast signal. A setting process for sharing the channel with the base station may be performed.
- a radio base station of the present invention includes a plurality of radio base stations that perform radio communication using at least one channel among a plurality of channels, and a plurality of terminal devices that perform radio communication with the radio base station, Searching means for searching for the terminal device closest to the radio base station for each of one or more of the plurality of channels when determining a channel to be used by the radio base station;
- the wireless base station in a wireless system comprising instruction means for transmitting a notification signal to the terminal device searched for by the means, when determining the channel to be used, the reception state of the notification signal of the terminal device Channel determining means for determining a channel to be used is provided.
- the management device of the present invention includes a plurality of radio base stations that perform radio communication using at least one channel among a plurality of channels, and a plurality of terminal devices that perform radio communication with the radio base station.
- the radio base station is a radio system management apparatus having channel determination means for determining a channel to be used based on a reception state of a broadcast signal transmitted from the terminal apparatus when determining a channel to be used.
- Searching means for searching for the terminal device closest to the radio base station for each of one or more of the plurality of channels when determining a channel to be used by the radio base station; Instructing means for transmitting a notification signal to the terminal device searched by means is provided.
- the radio base station of the present invention is a radio base station that performs radio communication by sharing a channel between radio base stations, and generates a burst signal transmitted from a terminal that is closest to the own station for each channel. And a channel determination means for relaying the terminal between the own station and the other radio base station when determining the operation channel and sharing the operation channel with another radio base station. . (9) Further, the channel determination means may determine the channel of the cell having the same standard as that of the own station as the operation channel without setting the channel of a cell having a different standard from that of the own station as the operation channel.
- the channel determining means determines that the cell has the same standard as that of the own station when the burst signal can be received, and uses a cell having a different standard from that of the own station when the burst signal cannot be received. You may determine that there is.
- the wireless system of the present invention is a wireless system that performs wireless communication by sharing a channel between wireless base stations, and is based on a burst signal transmitted from a terminal closest to the wireless base station for each channel.
- the channel determination means determines the channel of the cell having the same standard as that of the radio base station as the operation channel without setting the channel of the cell having a standard different from that of the radio base station as the operation channel. Also good.
- the channel determination means determines that the standard is the same cell as the radio base station when the burst signal can be received, and the radio base station and the standard when the burst signal cannot be received. May be determined to be different cells.
- the database apparatus according to the present invention is a database apparatus having channel information that can be used in a radio base station that performs radio communication by sharing a channel between radio base stations, and the radio base station has a distance for each channel.
- the operating channel is determined, and when the operating channel is shared with another radio base station, the terminal is connected between the radio base station and the other radio base station.
- the channel determining means of the radio base station to be relayed for each channel that can be used in the radio base station, the terminal that is closest to the radio base station is searched, and the terminal transmits the burst signal
- the other radio base station is instructed as described above.
- the other radio base station may schedule the terminal nearest to the radio base station to periodically transmit CBP burst.
- the present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.
- the channel can be shared by searching for a cell having the same standard as the local station.
- the same reference numerals are given to configurations showing similar functions.
- the TVWSDB apparatus 3 performs a search process for searching for each CPE terminal 6 that transmits a CBP burst in each channel, and instructs all the searched CPE terminals 6 to transmit a CBP burst. Although processing was performed, the present invention is not limited to this.
- the TVWSDB apparatus 3 determines whether or not the CPE terminal 6 searched for by the search process exists within a preset range from the new base station 4, and only from the CPE terminal 6 existing within the predetermined range.
- a CBP burst transmission instruction may be issued to existing base stations 5 in which CPE terminals 6 existing within a predetermined range are registered.
- the TVWSDB apparatus 3 first searches for the existing base station 5 in the adjacent predetermined range (that is, within the range where there is a possibility of interference) based on the position of the new base station 4, and each of the found existing base stations 5, among the CPE terminals 6 whose positions are registered, the CPE terminal 6 that is the closest to the new base station 4 is picked up for each existing base station 5 so that at least the CPE terminals 6 transmit CBP bursts. It may be configured. Also by this, the same effect as the above-described embodiment can be obtained more efficiently.
- the TVWSDB device 3 functions as a management device and searches for a CPE terminal 6 that transmits a CBP burst, and only this CPE terminal 6 transmits a CBP burst.
- instruction processing for giving instructions has been described as an example.
- the search process and the instruction process may be configured to be performed by an apparatus different from the TVWSDB apparatus 3.
- the TVWSDB device 3 holds only the database, and a device (a network management system 1 or a network control system 2 or the like) provided separately from the database and connected to the IP network 7 performs search processing and instruction processing. You may comprise. That is, the wireless communication system of the present invention only needs to have some means for performing the above-described search processing and instruction processing.
- the case where the newly installed base station 4 and the existing base station 5 are provided with GPS, and the location information of the own station is acquired by itself and notified to the TVWSDB apparatus 3 is described as an example.
- the present invention is not limited to this, and the position specifying means is not limited to the GPS, and the new base station 4 and the existing base station 5 themselves acquire the position information and the TVWSDB device 3 It is not necessary to notify and register. That is, in the present invention, it is preferable that the TVWSDB apparatus 3 holds the position information of the newly installed base station 4 and the existing base station 5, and the method for holding the position information is not limited in the present invention.
- the new base station 4 or the existing base station 4 It is not necessary to use the position information of the base station 5.
- the present invention is not limited to the time of new installation, and needless to say, the present invention can be applied when the new base station 4 and the existing base station 5 are moved, reset, or used channels are changed.
- the present invention can be widely applied to a radio system, a radio base station, and a management apparatus that can perform radio communication by sharing a channel between radio base stations.
- a radio system For example, an empty channel (TV white space) in a TV frequency band is used. Therefore, it is suitable for use in a system that performs wireless communication.
- TV white space TV white space
- Network management system 2 Network control system 3: TVWSDB device 4: New base station 5: Existing base stations (5-1 to 5-m) 6: CPE terminals (6-1 to 6-l) 7: IP network AP: Radio base station (AP1, AP2) B: Shield
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Abstract
Description
Sense Multiple Access/Collision Avoidance)方式なのでキャリアセンスを行うが、802.22のTDD方式で電波の存在しない時間であるTTG(Transmit/Receive Transition Gap),RTG(Receive/Transmit Transition Gap)に送信を開始し、TTG,RTG後に送信を開始した802.22のフレームと同一チャネル干渉を起こしてしまう。
また、前記無線基地局の前記チャネル決定手段は、前記複数のチャネルに空きチャネルが存在するか否かを検索し、空きチャネルが存在する場合には当該空きチャネルを使用するチャネルに決定し、空きチャネルが存在しない場合には、受信した前記報知信号に基づいて、自局と同じ規格の前記報知信号または前記制御信号のチャネルを使用するチャネルに決定してもよい。
なお、前記無線基地局の前記チャネル決定手段は、前記複数のチャネルに空きチャネルが存在するか否かを検索し、空きチャネルが存在する場合には当該空きチャネルを使用するチャネルに決定し、空きチャネルが存在しない場合には、受信した前記報知信号、及び/又は、受信した他の無線基地局からの制御信号に基づいて、自局と同じ規格の前記報知信号または前記制御信号のチャネルを使用するチャネルに決定してもよい。
さらに、前記無線基地局の前記チャネル決定手段は、前記報知信号を受信できた場合に自局と規格が同じであると判定し、報知信号を受信できなかった場合に自局と規格が異なると判定してもよい。
また、前記無線基地局は、自局と同じ規格の前記報知信号のチャネルを使用する際、当該報知信号を送信した前記端末装置を介して、当該チャネルを使用している他の無線基地局と当該チャネルを共有するための設定処理を行ってもよい。
本発明の無線基地局は、複数のチャネルの中の一のチャネルを使用して無線通信を行う複数の無線基地局と、前記無線基地局と無線通信を行う複数の端末装置と、前記無線基地局が使用するチャネルを決定する際に、前記複数のチャネルのうちの一以上のチャネル毎に当該無線基地局との距離が最も近い前記端末装置を検索する検索手段と、前記検索手段によって検索された前記端末装置に報知信号を送信させる指示手段と備えた無線システムにおける前記無線基地局であって、前記使用するチャネルを決定する際、前記端末装置の前記報知信号の受信状態に基づいて使用するチャネルを決定するチャネル決定手段を備えたことを特徴とする。
本発明の管理装置は、複数のチャネルの中の一のチャネルを使用して無線通信を行う複数の無線基地局と、前記無線基地局と無線通信を行う複数の端末装置とを備え、前記無線基地局は、使用するチャネルを決定する際、前記端末装置から送信された報知信号の受信状態に基づいて使用するチャネルを決定するチャネル決定手段を有する無線システムの管理装置であって、前記無線基地局が使用するチャネルを決定する際に、前記複数のチャネルのうちの一以上のチャネル毎に当該無線基地局との距離が最も近い前記端末装置を検索する検索手段と、前記検索手段によって検索された前記端末装置に報知信号を送信させる指示手段とを備えたことを特徴とする。
無線システムは、ネットワーク管理システム(Network Management System:NMS)1と、ネットワーク制御システム(Network
Control System:NCS)2と、TVWSDB(Television
White Space Database)装置3と、新設基地局4と、既設基地局5と、CPE(Customer
Premises or Portable Equipment)端末6とを備えている。
なお、TVWSDB装置3は、新設基地局4に通知したすべてのチャネル毎にCPE端末6をDBから検索せずに、新設基地局4の位置情報に基づいて近隣エリア(例えば所定範囲内)のCPE端末6や既設基地局5に位置登録されたCPE端末6を検索するようにしてもよい。すべてのチャネル毎に検索することにより、隠れ端末などによる干渉をより確実に防ぐことができる一方、新設基地局4の位置情報に基づいて検索する範囲を絞ることによって、効率を向上できる。
このように、TVWSDB装置3は、無線システム内の管理装置として、新設基地局4が使用チャネルを決定する際に、新設基地局4が使用可能なホワイトスペースのチャネルのうちの少なくとも一以上のチャネル毎に、新設基地局4に距離が一番近いCPE端末6をDBから検索する検索処理を行う検索手段として機能する。
さらに、TVWSDB装置3は、検索手段によって検索した各CPE端末6と同じチャネルを使用している、または、各CPE端末6が位置登録されている既設基地局5をDBから検索し、各チャネルで新設基地局4に距離が一番近いCPE端末6がCBPバーストを送信するように、そのCPE端末6をセル内に有する各既設基地局5に指示を出す指示処理を行う指示手段として機能する。
Strength Indicator)測定を行い、RSSIが所定の規定値より低い場合に空きチャネルであると判定し、高い場合に使用チャネルであると判定する。
Header:スーパーフレーム制御ヘッダ)を受信(復調)できた場合に、自局と同一規格であると判定する。つまり、新設基地局4は、使用するチャネルを決定する際、CBPバーストの受信状態、及び/又は、既設基地局5の制御信号の受信状態に基づいて、使用するチャネルを決定する。
なお、ステップS307において既存基地局5からのSCHを受信できた場合は同じIEEE802.22の基地局として保存する(ステップS308)と説明した。そして、ステップS314において、SCHを受信できた既設基地局5と同じチャネルを運用周波数に設定することが決定された場合には、当該既設基地局5と新設基地局4とは、図4に示したようにCPE端末6を介して無線チャネルをシェアするための処理を行うのではなく、当該処理をCPE端末6を介さずに直接行う。
(1)本発明の無線システムは、複数のチャネルの中の少なくとも一のチャネルを使用して無線通信を行う複数の無線基地局と、前記無線基地局と無線通信を行う複数の端末装置とを備えた無線システムであって、前記無線基地局が使用するチャネルを決定する際に、前記複数のチャネルのうちの一以上のチャネル毎に当該無線基地局との距離が最も近い前記端末装置を検索する検索手段と、前記検索手段によって検索された前記端末装置に報知信号を送信させる指示手段とを更に備え、前記無線基地局は、前記使用するチャネルを決定する際、前記端末装置の前記報知信号の受信状態に基づいて使用するチャネルを決定するチャネル決定手段を備えたことを特徴とする。
(2)また、前記無線基地局の前記チャネル決定手段は、前記複数のチャネルに空きチャネルが存在するか否かを検索し、空きチャネルが存在する場合には当該空きチャネルを使用するチャネルに決定し、空きチャネルが存在しない場合には、受信した前記報知信号に基づいて、自局と同じ規格の前記報知信号または前記制御信号のチャネルを使用するチャネルに決定してもよい。
(3)なお、前記無線基地局の前記チャネル決定手段は、前記複数のチャネルに空きチャネルが存在するか否かを検索し、空きチャネルが存在する場合には当該空きチャネルを使用するチャネルに決定し、空きチャネルが存在しない場合には、受信した前記報知信号、及び/又は、受信した他の無線基地局からの制御信号に基づいて、自局と同じ規格の前記報知信号または前記制御信号のチャネルを使用するチャネルに決定してもよい。
(4)さらに、前記無線基地局の前記チャネル決定手段は、前記報知信号を受信できた場合に自局と規格が同じであると判定し、報知信号を受信できなかった場合に自局と規格が異なると判定してもよい。
(5)また、前記無線基地局は、自局と同じ規格の前記報知信号のチャネルを使用する際、当該報知信号を送信した前記端末装置を介して、当該チャネルを使用している他の無線基地局と当該チャネルを共有するための設定処理を行ってもよい。
(6)本発明の無線基地局は、複数のチャネルの中の少なくとも一のチャネルを使用して無線通信を行う複数の無線基地局と、前記無線基地局と無線通信を行う複数の端末装置と、前記無線基地局が使用するチャネルを決定する際に、前記複数のチャネルのうちの一以上のチャネル毎に当該無線基地局との距離が最も近い前記端末装置を検索する検索手段と、前記検索手段によって検索された前記端末装置に報知信号を送信させる指示手段と備えた無線システムにおける前記無線基地局であって、前記使用するチャネルを決定する際、前記端末装置の前記報知信号の受信状態に基づいて使用するチャネルを決定するチャネル決定手段を備えたことを特徴とする。
(7)本発明の管理装置は、複数のチャネルの中の少なくとも一のチャネルを使用して無線通信を行う複数の無線基地局と、前記無線基地局と無線通信を行う複数の端末装置とを備え、前記無線基地局は、使用するチャネルを決定する際、前記端末装置から送信された報知信号の受信状態に基づいて使用するチャネルを決定するチャネル決定手段を有する無線システムの管理装置であって、前記無線基地局が使用するチャネルを決定する際に、前記複数のチャネルのうちの一以上のチャネル毎に当該無線基地局との距離が最も近い前記端末装置を検索する検索手段と、前記検索手段によって検索された前記端末装置に報知信号を送信させる指示手段とを備えたことを特徴とする。
(8)本発明の無線基地局は、チャネルを無線基地局間で分け合って無線通信を行う無線基地局であって、チャネル毎に自局に距離が一番近い端末から送信されるバースト信号に基づいて、運用チャネルを決定し、他の無線基地局と前記運用チャネルを分け合う際に、自局と前記他の無線基地局間に前記端末を中継させるチャネル決定手段を備えたことを特徴とする。
(9)また、前記チャネル決定手段は、自局と規格が異なるセルの前記チャネルを前記運用チャネルにせず、自局と規格が同じセルの前記チャネルを前記運用チャネルとして決定してもよい。
(10)また、前記チャネル決定手段は、前記バースト信号を受信できた場合に自局と規格が同じセルであると判定し、バースト信号を受信できなかった場合に自局と規格が異なるセルであると判定してもよい。
(11)本発明の無線システムは、チャネルを無線基地局間で分け合って無線通信を行う無線システムであって、チャネル毎に無線基地局に距離が一番近い端末から送信されるバースト信号に基づいて、運用チャネルを決定し、他の無線基地局と前記運用チャネルを分け合う際に、前記無線基地局と前記他の無線基地局間に前記端末を中継させるチャネル決定手段を備えたことを特徴とする。
(12)また、前記チャネル決定手段は、前記無線基地局と規格が異なるセルの前記チャネルを前記運用チャネルにせず、前記無線基地局と規格が同じセルの前記チャネルを前記運用チャネルとして決定してもよい。
(13)また、前記チャネル決定手段は、前記バースト信号を受信できた場合に前記無線基地局と規格が同じセルであると判定し、バースト信号を受信できなかった場合に前記無線基地局と規格が異なるセルであると判定してもよい。
(14)本発明のデータベース装置は、チャネルを無線基地局間で分け合って無線通信を行う無線基地局で使用可能なチャネル情報を有するデータベース装置であって、チャネル毎に前記無線基地局に距離が一番近い端末から送信されるバースト信号に基づいて、運用チャネルを決定し、他の無線基地局と前記運用チャネルを分け合う際に、前記無線基地局と前記他の無線基地局間に前記端末を中継させる前記無線基地局のチャネル決定手段のために、前記無線基地局で使用可能な各チャネルについて、前記無線基地局に距離が一番近い端末を検索し、前記端末が前記バースト信号を送信するように前記他の無線基地局に指示することを特徴とする。
(15)また、前記他の無線基地局は、前記無線基地局に距離が一番近い端末が定期的にCBPburstを送信するようにスケジュールしてもよい。
また、上述した実施形態では、TVWSDB装置3が、CBPバーストを送信させるCPE端末6を各チャネルで検索する検索処理を行い、検索されたすべてのCPE端末6がCBPバーストを送信するよう指示する指示処理を行ったが、本発明はこれに限定されるものではない。例えば、TVWSDB装置3は、検索処理によって検索されたCPE端末6が新設基地局4から予め設定された範囲内に存在するか否かを判断し、所定の範囲内に存在するCPE端末6からのみCBPバーストを送信させるべく、所定の範囲内に存在するCPE端末6が位置登録されている既設基地局5に対して、それらCPE端末6に対するCBPバースト送信指示を行うように構成してもよい。これによって、上述した実施形態と同様の効果をより効率良く得ることができる。
さらに、TVWSDB装置3は、新設基地局4の位置に基づいて、隣接する所定範囲内(すなわち、干渉のおそれがある範囲内)の既設基地局5をまず検索し、検索された各既設基地局5において、位置登録されているCPE端末6のうち、新設基地局4に最も距離が近いCPE端末6を既設基地局5毎にピックアップして、少なくともそれらCPE端末6がCBPバーストを送信するように構成してもよい。これによっても上述した実施形態と同様の効果をより効率的に得ることができる。
また、上述した実施形態および上記変形例では、TVWSDB装置3が、管理装置として機能し、CBPバーストを送信させるCPE端末6を検索する検索処理と、このCPE端末6のみがCBPバーストを送信するよう指示を行う指示処理を行う場合を例にあげて説明した。しかし、検索処理と指示処理はTVWSDB装置3とは別装置が行うように構成してもよい。例えば、TVWSDB装置3はデータベースのみを保持し、これとは別に設けられIPネットワーク7に接続された装置(ネットワーク管理システム1やネットワーク制御システム2などでも可)が、検索処理と指示処理を行うように構成してもよい。つまり、本発明の無線通信システムは、上述した検索処理と指示処理を行う手段を何処かに備えていればよい。
さらに、上述した実施形態では、新設基地局4や既設基地局5はGPSを備え、自局の位置情報を自身が取得してTVWSDB装置3へ通知、登録する場合を例にあげて説明した。しかし、本発明はこれに限定されるものではなく、位置の特定手段はGPSに限定されるものではなく、また、位置情報を新設基地局4,既設基地局5自身が取得してTVWSDB装置3へ通知、登録しなくてもよい。つまり、本発明においてTVWSDB装置3が新設基地局4,既設基地局5の位置情報を保持することが好ましく、保持させるための方法は本発明において限定されるものではない。なお、上述した実施形態のように、TVWSDB装置3がすべてのチャネル毎に新設基地局4との距離が最も近いCPE端末6を検索してバースト送信をさせるのであれば、新設基地局4や既設基地局5の位置情報を用いる必要はない。
なお、上述した実施形態では、新設基地局4を新設する場合を例にあげて説明した。しかし、本発明は新設時に限られず、新設基地局4、既設基地局5の移設する際や、リセットする際や、使用チャネルを変更する際にも適用できることはいうまでもない。
Claims (6)
- 複数のチャネルの中のチャネルを使用して無線通信を行う複数の無線基地局と、前記無線基地局と無線通信を行う複数の端末装置とを備えた無線システムであって、
前記無線基地局が使用するチャネルを決定する際に、前記複数のチャネルのうちの一以上のチャネル毎に当該無線基地局との距離が最も近い前記端末装置を検索する検索手段と、
前記検索手段によって検索された前記端末装置に報知信号を送信させる指示手段とを更に備え、
前記無線基地局は、前記使用するチャネルを決定する際、前記端末装置の前記報知信号の受信状態に基づいて使用するチャネルを決定するチャネル決定手段を備えた
ことを特徴とする、無線システム。 - 前記無線基地局の前記チャネル決定手段は、前記複数のチャネルに空きチャネルが存在するか否かを検索し、空きチャネルが存在する場合には当該空きチャネルを使用するチャネルに決定し、空きチャネルが存在しない場合には、受信した前記報知信号に基づいて、自局と同じ規格の前記報知信号または前記制御信号のチャネルを使用するチャネルに決定する
ことを特徴とする、請求項1記載の無線システム。 - 前記無線基地局の前記チャネル決定手段は、前記報知信号を受信できた場合に自局と規格が同じであると判定し、報知信号を受信できなかった場合に自局と規格が異なると判定する
ことを特徴とする請求項1又は2に記載の無線システム。 - 前記無線基地局は、自局と同じ規格の前記報知信号のチャネルを使用する際、当該報知信号を送信した前記端末装置を介して、当該チャネルを使用している他の無線基地局と当該チャネルを共有するための設定処理を行う
ことを特徴とする、請求項2又は3に記載の無線システム。 - 複数のチャネルの中の一のチャネルを使用して無線通信を行う複数の無線基地局と、前記無線基地局と無線通信を行う複数の端末装置と、前記無線基地局が使用するチャネルを決定する際に、前記複数のチャネルのうちの一以上のチャネル毎に当該無線基地局との距離が最も近い前記端末装置を検索する検索手段と、前記検索手段によって検索された前記端末装置に報知信号を送信させる指示手段と備えた無線システムにおける前記無線基地局であって、
前記使用するチャネルを決定する際、前記端末装置の前記報知信号の受信状態に基づいて使用するチャネルを決定するチャネル決定手段を備えた ことを特徴とする、無線基地局。 - 複数のチャネルの中の一のチャネルを使用して無線通信を行う複数の無線基地局と、前記無線基地局と無線通信を行う複数の端末装置とを備え、前記無線基地局は、使用するチャネルを決定する際、前記端末装置から送信された報知信号の受信状態に基づいて使用するチャネルを決定するチャネル決定手段を有する無線システムの管理装置であって、
前記無線基地局が使用するチャネルを決定する際に、前記複数のチャネルのうちの一以上のチャネル毎に当該無線基地局との距離が最も近い前記端末装置を検索する検索手段と、
前記検索手段によって検索された前記端末装置に報知信号を送信させる指示手段とを備えた ことを特徴とする、管理装置。
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KR20140130556A (ko) | 2014-11-10 |
JPWO2013153884A1 (ja) | 2015-12-17 |
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