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    • 专利摘要:
    multi-channel wireless communication system, base station and channel Using the method to make effective use of white space with fairness in a multi-channel wireless communication system, a base station (10) judges whether the base station's bak reserve channel ( 10) has a channel that is not an operational channel operated by another base station (20) configuring an adjacent cell (2) by a channel management unit (107), and when there is at least one channel that is not an optical path of the other base station (20), perform fairness processing according to a prescribed tag to have one of the channels as an operational channel of the base station (10), and when there is no channel that is not a canopic of the other base station ( 20), determine a base station that requests a release of an operational channel from the other base station (20), based on a degree of satisfaction cs defined as a function of a communication traffic offered within a cell (1), a rate of trans transmission depending on a propagation environment between the base station (10) and a wireless communication terminal (11) and a currently allocated canopic number, and perform negotiation processing to cause an operational channel to be released.
    公开号:BR102013000834B1
    申请号:R102013000834-6
    申请日:2013-01-11
    公开日:2022-01-11
    发明作者:Keigo Hasegawa；Masayuki Takekawa；Keat Beng Toh
    申请人:Hitachi Kokusai Electric Inc；
    IPC主号:
    专利说明:

    FUNDAMENTALS OF THE INVENTION
    [0001] The present invention relates to a multi-channel wireless communication technology, whereby a base station uses two or more channels to configure a cell including wireless communication terminals and, more particularly, to a technology for controlling the use of channels between neighboring base stations.
    [0002] Progress of an information society in recent years is remarkable, and as a communication method for many information and communications devices and services, wireless communication is also often used instead of wired communication.
    [0003] Therefore, the demands for radio frequencies, whose use is limited, are continually multiplying, and the exhaustion of frequencies that can be allocated represents a major problem in all countries of the world. In general, a country performs license management of the frequencies, and only those that are licensed can use the frequencies in the specific location and time period.
    [0004] However, in order to satisfy the demands of frequencies that will continually increase in the future, a new method of using the frequencies not being tied to the incumbent method of use is being demanded.
    [0005] Therefore, as a new method of using frequencies to solve the problem of frequency depletion, studies are being done in these years to provide a method using a frequency band (for white space), which is not used spatially. and temporally, although it has already been allocated.
    [0006] For example, research and development is being carried out on a cognitive wireless or similar communication system whereby an unlicensed user who (hereinafter referred to as "secondary user") uses white space radio waves flexibly, while the influence of the incumbent system for a licensed user (hereinafter referred to as the "primary user") for the frequency usage is sufficiently avoided. See non-patent literature 1: Koji Fuji, "Cognitive radio: Core technology of using white space to eliminate the waste of wave use", RIC TELECOM, retrieved June 9, 2011, on the Internet from businessnetwork.jp.
    [0007] For example, in a wireless communication system, using white space, which is standardized by IEEE 802.22, respective radio stations access the database (DB) on an IP network via PAWS (database of White Space Access Protocol) to obtain a list of transmission channels (frequency list) based on position information at a local station and maximum transmit power. The broadcast channel list is collectively managed while being updated as needed by a spectrum manager (SM) within a base station (BS). And, the BS determines a usable channel for communication as an operational channel according to the list of transmission channels and communicates with a wireless communication terminal (CPE: Customer Premises Equipment) such as a slave station, a telephone cellular or similar, installed from door to door within a service area (cell) of the BS.
    [0008] The SM manages spectrum sensing information. The respective radio stations (such as BS and CPE, the same applies below) are provided with a spectrum detection function. Upon detection by spectrum detection that a certain operational channel is being used by the incumbent system (system for the primary user), the respective radio stations notify the information to the SM. Then the SM notifies the detected information to the DB and excludes the above channel from the broadcast channel list.
    [0009] The wireless communication system using white space performs dynamic access to the spectrum, based on information that is updated at every moment, as described above, avoiding an influence on the frequency usage by the primary user and also performing the communication of the secondary user.
    [0010] Other functions provided to the SM include a function to share an operational channel list (OPE) and a reserve channel list (.BAK) with an adjacent BS and, according to this information, a channel can be selected exclusively to not cause interference between IEEE802.22 cells (adjacent cells) located geographically close together. A self-coexistence (SC) function is provided, so that, in a case where exclusive use is impossible, the channel is shared between adjacent cells by timesharing. See literature no: patent 2 : "IEEE Std 802.22-2011 part 22: Cognitive Wireless RAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Policies and Procedures for Operation in the TV Bands”, edited by the Institute of Electrical and Electronics Engineers (IEEE) Computer Society, (USA), IEEE Standards Association, July 27, 2011.
    [0011] Fig. 8 is a flowchart showing a flow for determining an operational channel after obtaining a list of channels usable by the cell itself and a list of channels of all adjacent cells, in accordance with Non-Patent Literature.
    [0012] Non-patent literature 2 includes, for example, the following states as a channel state.
    [0013] AVA (available): Channel notified as a blank usable by DB.
    [0014] OPE (operation): Channel operating in the cell.
    [0015] BAK (Reserve - “Backup”): Candidate operating channel that is AVA and also judged to be operable according to a detection result.
    [0016] LP1 (Local Priority 1): channel that is not OPE or BAK of an adjacent cell in BAK.
    [0017] LP2 (Local Priority 2): channel, which is not OPE of an adjacent cell in BAK.
    [0018] LP3 (Local Priority 3): OPE channel of an adjacent cell in BAK.
    [0019] As long as a SCH (Superframe Control Header) or a CBP (Coexistence Beacon Protocol) is received from the adjacent cell, each BS can get a list of OPE and BAK channels from the adjacent cell. Then, a channel not causing interference between adjacent cells is selected, depending on the operational state of the channel on the adjacent cell.
    [0020] The SCH is a frame header, which is transmitted in a superframe upper frame having 16 frames as a control cycle and includes an ID to uniquely identify the BS and information about candidate channels for use.
    [0021] The CBP is transmitted during a period called an SCW (auto coexistence window) allocated to the last uplink subframe, and includes information about IDs and number of BAK channels to uniquely identify BS similar to SCH and also includes elements information (IE), such as a frame release request (FC-REQ) for an ODFC (on-demand frame contention) (Fig. 8, S104), a reply (FC-RSP), an acknowledgment of reply (FC -ACK) and a release notification (FC-REL), which are used in an auto-coexistence mode.
    [0022] First, the SM judges based on the operational channel information in the adjacent cell whether or not there is an exclusively available channel, ie a channel in an LP1 or LP2 state (step S101).
    [0023] And, when there is an exclusively available channel and LP1, a channel that is determined to be an OPE is selected from LP1, and when there is no LP1, a channel that is determined to be the OPE is selected from LP2 (step S102 ). In this case, a channel can also be selected according to the specified system standard, such as the channel usage priority order, to determine its channel as an operating channel. For the priority order, there is a way to follow the channel quality such as a CINR (Carrier Power to Interference and Noise Power Ratio)), country-defined wireless communication regulation, a network operation rule, or network operator instruction.
    [0024] On the other hand, when there is not an exclusively available channel, the SM judges whether SC (auto coexistence) mode can be executed or not (step S103).
    [0025] When there is no LP3, or when SC mode cannot be performed because of wireless communication regulation set by country, a network operation rule or network operator instruction, the operation channel is not obtained , and BS operation is stopped, or is on hold until an exclusively available channel becomes available. When SC mode can be executed, any channel is selected from LP3, and a right to channel operation is obtained in one unit of frame by random algorithm which is called ODFC of adjacent cell OPE to perform channel sharing between cells by time sharing, or when interference can be avoided by synchronizing a downlink transmit/receive (DS) period and an uplink (US) transmit/receive period) between cells, channel sharing is performed as a result .
    [0026] The other prior art documents of the present invention are disclosed in Japanese patent application publication 2009-515,468. SUMMARY OF THE INVENTION
    [0027] The IEEE802.22 system provides the CPE with a wireless broadband communication system, and it is considered natural to use multiple channels (multichannel) at the same time in order to provide better communication service.
    [0028] However, the operating channel determining unit of the non-patent literature 2 is not supposed to use multiple channels as the operating channels. Therefore, when the various operational channels are obtained by the non-patent literature method 2, a cell that previously tried to obtain a channel occupies many channels. Therefore, a cell that is configured and managed by a later activated BS, or a channel is added later to obtain according to traffic, etc., a uniquely operable channel, is not currently left over, and services between cells become sufferable.
    [0029] The IEEE 802.22 system has been described with reference to a specific example, but the same deficiency is caused not only in the IEEE 802.22 system, but also in a cognitive radio communication system that is provided with several BSs configuring an area where the Subscriber stations are included using the various channels.
    [0030] The present invention has been made taking into account the above circumstances and provides a multi-channel wireless communication system provided with several base stations (BSs) configuring cells including wireless communication terminals (CPEs) by using several channels, respectively, where multiple channels are made available sufficiently between the cells to perform customer satisfaction improvement (CS: customer satisfaction) of the respective cells.
    [0031] The present invention also provides realization of efficient use of white space with fairness in multichannel wireless communication system.
    [0032] A channel using the method according to the present invention is a method performed by a base station, configuring a cell including wireless communication terminals through a plurality of channels, which includes judgment processing to judge whether there is or not a channel that is not an operating channel of another base station, configuring a cell adjacent to the cell itself within reserve channels, which can be used by the base station; unbiased processing which, when there is at least one channel which is not the operating channel of another base station, determines one of the channels as the operating channel of the base station in accordance with a prescribed protocol; and negotiation processing which, when there is no channel that is not the operating channel of another base station, determines a base station to request the release of an operating channel from the other base station and causes the given base station to release the operating channel based on a degree of satisfaction that is defined as a function of the communication traffic offered within the cell, a transmission rate depending on the propagation environment between the base station and the wireless communication terminals, and a number of currently allocated operating channels.
    [0033] For example, in the system that defines LP1, LP2 and LP3 as described above, it is judged whether there is a channel (i.e. LP1 or LP2) that is not an operational channel (OPE) of another base station that configures a cell that is adjacent to the cell itself, within reserve channels (BAK) that can be used by the base station itself, and, when such a channel exists, this channel is determined as the OPE operational channel itself) as far as the spectral tag allows, while, when there is no such channel (i.e. LP3), a series of processing is repeated to make the other base station release an operational channel (OPE) through negotiation processing according to the degree of satisfaction
    [0034] According to the channel usage method of the present invention, for example, when there is a channel that is not an operational channel of another base station within the reserve channels that can be used by the base station, the fairness processing further judges whether the channel is not a reserve channel which output portion will be used by the other base station; when it is not a reserve channel of another base station, determines the channel as the operational channel itself; and when it is a reserve channel of another base station, determines the channel as the operational channel itself based on the condition that the satisfaction rating of the base station is less than the satisfaction rating of the other base station or the satisfaction rating of the other base station be invariant by repeating a series of processing after the judgment processing.
    [0035] That is, when the base station itself goes to OPE the channel in BAK according to the example above, the above channel can be determined as OPE in a case of LP1, and the balance of the degree of satisfaction is taken into account in a case of LP2 and the BAK of another base station is determined as OPE of the base station itself.
    [0036] Therefore, the base station itself can have a channel in BAK put in OPE while maintaining impartiality with the base station of the adjacent cell.
    [0037] According to the channel usage method of the present invention, for example, the negotiation processing causes the other base station to release an operational channel based on the condition that the satisfaction degree of the base station is minimal ( less than or equal to the degree of satisfaction of any other base station) compared to the degree of satisfaction of the other base station or the degree of satisfaction of the other base station being invariable by repeating the series of processing after the judgment processing, and the degree satisfaction of both is not reversed when the other base station is prompted to release the operational channel.
    [0038] Specifically, according to the above case, when the base station itself goes to OPE a channel that is within BAK, LP3 communication interference (OPE from another base station) is caused when the channel is subjected to OPE as he is. Therefore, the OPE of another base station is released considering the balance of the degree of satisfaction, thus making it possible to determine the above channel as the OPE of the base station itself.
    [0039] Therefore, communication interference with the base station in the adjacent cell is not caused, and the base station itself can have the channel within BAK as OPE, with impartiality.
    [0040] The multi-channel wireless communication system according to the present invention is provided with a plurality of base stations configuring a cell including wireless communication terminals by the use of one or a plurality of channels, and a management device for manage information about a reserve channel that can be used by each of the plurality of base stations, where the management device judges whether there is a channel that is not operated by another base station by configuring a cell adjacent to a cell of a base station, within reserve channels that can be used by the base station, and when there is at least one non-operated channel, determine the non-operated channel as the operating channel itself according to the prescribed label, and when there is no non-operated channel, select a base station requesting a release of an operational channel from the other base station, based on an offered communication traffic within the cell, a speed of communication depending on a propagation environment between the base station and the wireless communication terminals, and the degree of satisfaction which is determined as a function of the number of operational channels currently allocated, and carry out channel negotiation with the selected base station.
    [0041] At this point, the management device in the multi-channel wireless communication system can be provided in the form of a server on the network in which the respective base stations are centrally controlled or in the form in which the respective base stations are provided with a function of the management device.
    [0042] Therefore, this multi-channel wireless communication system effects the dielectric material and channel usage according to the present invention.
    [0043] The base station according to the present invention is a base station configuring a cell that includes wireless communication terminals by using a plurality of channels of a frequency of a blank, comprising channel management unit that judges if there is a channel that is not operated by another base station by configuring a cell adjacent to a base station cell within reserve channels that are determined by spectral sensing and that can be used by the base station, and when there is at least one channel that is not is operated, determines one of the channels as an operational channel of the base station according to a prescribed tag, and when there is no channel that is not operated, determines a base station to request a release of an operational channel from the other base station, with based on the degree of satisfaction calculated for each base station and the other base station as a function of communication traffic offered within a cell, once communication speed depending on a propagation environment between the base station and the wireless communication terminals, and a currently allocated number of operational channels, and causing the determined base station to release the operational channel.
    [0044] Therefore, this base station performs the channel usage method according to the present invention.
    [0045] According to the present invention, the multi-channel wireless communication system using white space makes unbiased use of channel between cells possible and can provide good service in response to a request and range by users using a cell terminal. wireless communication.
    [0046] Other objects, features, and advantages of the present invention will become apparent from the following description of embodiments of the present invention, provided in connection with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a configuration diagram of a multi-channel wireless communication system according to an embodiment of the present invention. Figure 2 is a configuration diagram of a base station (BS) according to the embodiment of the invention. Figure 3 is a configuration diagram of a wireless communication terminal (CPE) according to an embodiment of the invention. Figure 4 is a diagram illustrating a channel determination process in accordance with the embodiment of the invention. Figure 5 is a diagram illustrating fairness processing in accordance with the embodiment of the invention. Fig. 6 is a diagram illustrating negotiation processing in accordance with the embodiment of the invention. Fig. 7 is a diagram illustrating negotiation processing in accordance with the embodiment of the invention. Fig. 8 is a diagram illustrating operational channel acquisition processing according to a conventional example. DESCRIPTION OF MODES OF ACHIEVEMENT
    [0047] Embodiments of the present invention are described below with reference to the drawings.
    [0048] In the respective drawings referred to in the following description, the same symbol is given to the same elements shown in the other drawings. <Multi-channel wireless communication system sketch>
    [0049] Figure 1 is a diagram showing an example of the entire structure of the multi-channel wireless communication system according to this embodiment.
    [0050] As shown in figure 1, the system of this example is composed of a cell 1, cell 2, a return link 51 of cell 1, return link 52 of cell 2, Internet 5 and a DB 6 of a device of management that provides information about a blank space. The management device provided with DB 6, which manages information about exclusively used operational channels (OPEs) and the like allocated to respective base stations (BSs) by configuring the respective cells, as described below.
    [0051] In the example shown, cell 1 includes CPE 11 and CPE 12 which are wireless communication terminals, such as a slave station, a cell phone and the like, which are installed door-to-door, and a BS 10 which is a station base to which the wireless communication terminals are connected, and a circle including CPE 11, CPE 12 and BS 10 shows a BS 10 service area, i.e. a cell 1 range.
    [0052] In the example shown, cell 2 includes CPE 21 to CPE 24 and a BS 20, and a circle including CPE 21 to CPE 14, and BS 20 shows a service area of BS 20, that is, a range of the cell 2.
    [0053] For example, a wireless communication system 3 (hereinafter referred to as the incumbent system) for a primary user licensed to use a country frequency includes a transmitting station 30. A circle including transmitting station 30 shows an area of incumbent system service 3 and provides a service by using a licensed channel f3.
    [0054] An incumbent system 4 includes a transmitting station 40. A circle including the transmitting station 40 shows a service area of the incumbent system 4 and provides a service through the use of a licensed channel f5.
    [0055] As shown in figure 1, a service area of cell 1 and a service area of incumbent system 3 are geographically positioned close to each other and also partially overlapping, so that when cell 1 has channel f3 as an OPE channel, causes interference to incumbent system 3. Therefore, cell 1 cannot use channel f3 as the blank.
    [0056] The fact that channel f3 cannot be used can be obtained when BS 10 accesses DB 6. When information on DB 6 is old and inaccurate, and even if channel f3 is notified as an AVA channel to BS 10, CPE 11 performs spectral sensing, and as a detected result, detection information from the incumbent system 3 is notified to BS 10, and the inability to use can be recognized.
    [0057] Cell 1 recognizes channels f1 to f5 as BAK channels by the above units. Additionally the OPE channel is determined from the above channels by using SM, so that the user satisfaction (CS) of each cell becomes good, as described below.
    [0058] Similarly, once incumbent system 4 exists in the vicinity, cell 2 accesses DB 6 to recognize that AVA can use channels f1 to f as blanks, and spectral sensing by CPE 24 checks whether the incumbent system is absent, thereby recognizing that the above channels are approximately BAK channels.
    [0059] In this example, the CS user satisfaction of each cell (each BS) is defined as expressed below (Expression 1a) or (Expression 1b). CS = NoPE/MaxcPE(W x λ / (R/NCPE)) ••••• (expression 1a) CS = NOPE/∑CPE(W x λ/R) ••••• (expression 1 b)
    [0060] At this point, CS means that the degree of satisfaction within the cell is greater when its value is greater, NOpE denotes the number of operational channels (but the SC mode channel is not included in this case) within the cell, à denotes a communication traffic offered from each CpE within the cell, R denotes a maximum communication speed or communication channel capacity of each CpE which is determined depending on a distance between the BS and CpE within the cell and a propagation environment, W denotes a weight of each CpE within the cell, NOpE denotes the number of CPEs within the cell, and ∑CPE denotes the total computation of all CpEs within the cell. When NOpE is 0, CS also becomes 0.
    [0061] W has a value that is determined according to, for example, subscriber affiliation or similar, and a large value is allocated to subscribers of a higher cost plan, municipalities, important infrastructure such as factories.
    [0062] When it is assumed that all channels have the same transmission capacity R in Expression 1a, R/NCpE shows transmission capacity per channel of each CpE when a communication opportunity is equally allocated to all CpEs within the cell à/ (R/NCpE) shows a number of channels needed by the CpE, and when a maximum value of the number of channels needed to which a weight (W) is added is determined to be a number of channels needed within the cell, the value of CS can also be understood as a value showing how many permissions the presently allocated channel number has in relation to the number of channels needed within the cell.
    [0063] On the other hand, when it is assumed that other CpEs also have the same R of the CPE, Expression 1b is also understood that, for each CPE, a value, which shows how much margin all the transmission capacity (NOPE * R , R denoting a speed per channel) of BS has relative to the traffic itself (A), is added with an added weight (W). The value of CS is normally a monotone increasing function of NOPE or R and a monotone decreasing function of NOPE or A . Since R is always variable, the value of CS can be a rough estimated value with a precision at a comparable level.
    [0064] In this example, this CS value is determined as a reference value, as described below, and, for example, the cell that judged the CS value to be relatively low compared to the adjacent cell selects an OPE channel with priority , or trades to get the OPE channel. < Base Station Specific Structure (BS) Example>
    [0065] Figure 2 shows an example of BS structure that becomes BS 10 or BS 20.
    [0066] The BS is provided with an antenna 101, an RF PART 102 that performs frequency conversion from a baseband (BB) to a radiofrequency (RF) band, frequency conversion from a radiofrequency band to a baseband, an amplification signal processing etc., a transmitted/received signal processing part 103 which performs error correction encoding/decoding processing and modulation/demodulation processing, a MAC (media access control) processing part 104 which performs signal control used channel timing and recognition of a wireless transmission source device, an I/F part 105 that interfaces with a return link, a personal computer or a router, a sensing part 106 that performs signal processing spectral sensing to judge whether or not there is a wireless system that uses a channel, frequency management part 107 (SM) that stores a usable channel as a blank, a main control part 10 8 which performs management control of the entire wireless device, and a connection terminal 109 which is used to connect to a return link, external equipment such as a personal computer and router, and an external network.
    [0067] The main control part 108 can be configured, for example, with a processor, a data storage area defined in memory and software, and the transmitted/received signal processing part 103, the processing part 104 of MAC, the sensing part 106, and the frequency management part 107 can be replaced by a program executed by the main control part 108.
    [0068] The frequency management part 107 includes functions to effect management of the operational state of a channel in the adjacent cell in addition to the available channel management storage and the process of determining the OPE channel operated within the cell, as shown in the figure 2. In accordance with the present invention, a channel negotiation function is also provided for making a channel release request and a response to a neighboring BS.
    [0069] That is, the frequency management part 107 configures a channel management unit that judges whether or not there is a channel, which is not an operational channel (OPE) of another base station by configuring the cell adjacent to the cell itself, within reserve channels (BAK) that can be used by the base station, and when there is a channel that is not an operational channel of the other base station, determines the same as an operational channel (OPE) that is used exclusively by the base station accordingly with the user satisfaction (CS) described above. < Wireless communication terminal (CPE) specific structure example >
    [0070] Figure 3 shows an example of CPE structure that becomes CPE 11, CPE 12, CPE 21, CPE 22 etc.
    [0071] The CPE is provided with an antenna 201, an RF part 202 which performs BB to RF frequency conversion and RF to BB band frequency conversion, amplification and signal etc., a signal processing part 203 that performs error correction encoding/decoding processing and modulation/demodulation processing, a MAC processing part 204 that performs control of the used channel and transmission and reception time, ID addition for identifying a wireless device to the packet, and recognition of a wireless device that is a transmission source, an I/F part 205 that interfaces with a personal computer and a router, a sensing part 206 that performs spectral sensing signal processing to judge whether or not there is a wireless system using a channel, a main control part 207 that performs management control of the entire wireless device, and a connection terminal 208 used to connect to external equipment, such as a personal computer or router, and an external network.
    [0072] The main control part 207 can have a configuration, for example, of a processor, a data storage area defined in a memory and software, and the transmit/receive signal processing part 203, the MAC processing 204, and the sensing part 206 can be replaced by a program executed by the main control part 207. <Multi-channel wireless communication system operations>
    [0073] Operation of the multi-channel wireless communication system according to this embodiment will be described below.
    [0074] In this embodiment, it is assumed, as initial state, that the frequency management part 107 included in each BS 10 and BS 20 accesses DB 6 in the IP network to obtain a list of available channels. BS 10 recognizes that channels f1, f2, f4 and f5 are available (being BAK) within cell 1 which is composed and managed by the base station, and BS 20 recognizes that channels f1, f2, f3 and f4 are BAK within cell 2 which is composed and managed by the base station. It is determined that the technique defined by IEEEE 802.22, i.e. the frequency management part 107 which is included in each BS 10 and BS 20 and receives SCH which is periodically transmitted by the BS of the adjacent cell and receives BOLT HEAD (18) which is transmitted by the BS or CPE of the adjacent cell recognizes the BAK channel and the OPE channel as operational states of the channels in the adjacent cell.
    [0075] In addition to the information element defined by IEEEE 9802.22, the CBF of this case includes, as a message used for a procedure by which the BS itself operates from the channel that is operated by the adjacent cell, information elements, such as request and release of channel (CN-REQ: Chanel Negotiaton Request), a response (CN-RSP: CN Response), a response acknowledgment (CN-ACK: CN Acknowledgment), a deliberation notification (CONECTOR-REL: CONECTOR Release), number of OPE channel (NOPE), operational channel number, and a CS value.
    [0076] Figure 4 is an OPE channel decision flow performed by each BS.
    [0077] First, wait is made for specified period of system time, so as to collect a situation of use of a channel in adjacent cell (can be plural) (step S201). During the above, sensing or the like is also performed to verify that the incumbent system has not started using the BAK channel again.
    [0078] The waiting period can be long when a CS value or an OPE channel number is greater and, thus, it is also possible to provide u the priority order between BSs that should obtain the OPE channel.
    [0079] After a delay time lapse, it is judged whether or not the BAK channels themselves have a channel that is in the fully available state exclusively LP1 or LP2 (step S202).
    [0080] As a judged result, when there is an exclusively available channel, channel selection processing is performed according to a spectral label considering fairness with reference to figure 5, as described below (step S203).
    [0081] On the other hand, when there is no channel available exclusively, it is judged whether or not the quality of service within the cell itself is satisfied (step S204). In this case, Expression 2 is used as, for example, a judgment index. Nsat=CountifcpE[NopE/NcpE×R>αλ] ••••• (Expression 2)
    [0082] Here, CountifCPE[] denotes a CPE number with which the conditional expression within the parentheses agrees, NCPE denotes a CPE number within the cell, and α denotes a degree of permission with respect to traffic À which is determined in the dependency Similar to Expression 1, NOPE denotes operational channel number, and R denotes a maximum transmission rate of each CPE.
    [0083] Therefore, Nsat of Expression 2 denotes the number of CPEs that can satisfy a bandwidth request (traffic processing speed) when bandwidth is allocated equally to all CPEs within the cell.
    [0084] And, when Nsat = NCPE, OPE channel acquisition is terminated assuming the CS within the cell has been satisfied.
    [0085] The index expressed by Expression 2 is just an example using BS that allocates bandwidth equally to all CPEs in the cell, and a conditional expression, when allocated according to the bandwidth allocation norm (algorithm) within the cell, must be a conditional expression to judge whether or not the CPE satisfies the bandwidth request.
    [0086] Similar to CS, the above index can also be an index showing the degree of satisfaction according to a relationship between the required number of operational channels in relation to the communication traffic offered within the cell and the number of operational channels actually allocated , so that a dielectric material and providing a threshold value with respect to the value of CS is estimated in a simple way.
    [0087] When the judgment in the above step S204 is Nsat<NCPE, it is judged whether or not there is an adjacent cell in which the CS value, after channel negotiation, is greater than the cell itself (step S205).
    [0088] As a result, when there is an adjacent cell in which the value and CS after negotiation and channel is greater than the cell itself, channel negotiation processing is performed on the BS in the adjacent cell to perform a channel release request OPE to the BS in the adjacent cell, as described below with reference to figure 6 and figure 7 and, depending on the outcome of the negotiation, additional acquisition of the OPE channel is carried out (step S206).
    [0089] As a judged result, when there is no adjacent cell in which the CS value, after channel negotiation, is greater than the cell itself, it is judged if NOPE = 0 , and the SC mode (self coexistence mode) step S207 can be carried out).
    [0090] When SC mode can be performed, the auto coexistence defined by IEEE802.22 is performed (step S208). Specifically, any channel is selected from LP3 and a right to channel operation in one frame unit is obtained by the randomized algorithm, called ODFC, to perform channel sharing between cells by time-sharing, or when interference can be avoided by synchronization. of a downlink transmit/receive period (DS=Down Stream) and an uplink transmit/receive period (US=Up Stream) between the cells, channel sharing is performed as a result.
    [0091] In this case, according to the channel negotiation processing described below, it is not always true that the adjacent cell releases a channel and it can be obtained as the uniquely available channel itself. Therefore, when there is no OPE channel, the processing sharing of the channel with the adjacent cell in SC mode is performed.
    [0092] Figure 5 is a flowchart showing in detail the operation of step S203 (fairness processing). First, it is judged whether there is an LP1 channel that is neither an OPE channel of the adjacent cell nor a BAK channel (step S301).
    [0093] As a result, when there is LP1, the above channel is not used by the adjacent cell, so one channel is selected as LP1's own OPE channel (step S302).
    [0094] On the other hand, when there is no LP1 (that is, there is no LP2) as the result judged above, it is judged whether the CS value of the value of the BS itself is minimal compared to the adjacent BS, or, in the process of operational channel acquisition (figure 4), if the CS value of the adjacent cell does not change when branching to step S203 for N times, and step S203 is executed every time (S203).
    [0095] The consecutive number of times N can be a system-defined constant for simplicity, but to impartially select a channel according to the order of the CS values in the adjacent cell, a technical way to have the CS values in ascending order (when the CS value is minimum, N=1) can be used. Whenever the above judgment is made, it is desirable that the CS value of each adjacent BS be updated by the value obtained in step S2301 or similar, but when this is difficult, the most recent CS value at the time or the minimum value (worst value) from the plurality of CS values obtained in the past can be used.
    [0096] When YES is judged in step S303, it is judged whether or not there is a cell having the same CS value as the cell itself (step S304), and when NO is judged, the impartiality processing (step S203) is terminated.
    [0097] Next, when it is judged that there is a cell having the same CS value of the cell itself (i.e., there are a plurality of minimum values in S303, and one of them is the CS of the cell itself), it is judged if the number of BAK channels of the cell itself is minimal compared to the cell having the same CS value as the cell itself (step S305).
    [0098] When there is no cell having the same CS value as the cell itself (step S304) and when the number of BAK channels is minimal compared to the cell having the same CS value (step S305), any channel is selected as the OPE channel within the BAK kennels (step S306).
    [0099] On the other hand, when NO is judged in step S305, a new OPE channel is not selected this time.
    [0100] That is, in the above-described fairness processing, OPE channel is selected for LP1 from the BAK channel itself, and the cell's own OPE channel is selected for LP2 according to a balance of the CS with the adjacent cell and a balance the number of BAK channels, so that balances do not become partial.
    [0101] In the fairness processing of figure 5, steps S303 to S305 can be partially omitted.
    [0102] Figure 6 is a flowchart showing in detail the operation of step S206 (trade processing).
    [0103] First, it is judged whether the CS value of the BS itself is minimal compared to the BS of the adjacent cell, or it is judged whether step S206 is performed continuously M times in the operational channel acquisition process (figure 4) and the CS value of the adjacent cell does not change during this period (step S401).
    [0104] The consecutive number of times M can be a system-defined constant, for simplicity, but to effect trading and channel impartially and efficiently according to the order of CS values in the adjacent cell, it can be determined to have a technical mode of have the CS values in ascending order (when the CS value is minimum, M=1).
    [0105] When YES is judged in step S401, the adjacent cell, in which the value of |CS becomes maximum when channel negotiation processing is performed, is selected as a negotiation destination (DST) (step S402).
    [0106] When channel negotiation is performed, the CS (CSDST) value of the DST after negotiation can be calculated by Expression 3 according to the number of operational channels and the CS value of the current DST. CSDST=CSX(NOPE-1)/NOPE ••••• (Expression 3)
    [0107] It is then judged whether or not the CS value is inverted through the negotiation and channel with the DST (step S403).
    [0108] For example, when DST operates only one channel, it is determined not to perform channel negotiation (CSDST becomes 0 in such DST). And CSDST of the cell itself has a value greater than 0, although À and R are unknowns). This avoids mutual shuffling for the channel (repeat trading).
    [0109] When the CS value is not inverted through channel negotiation like the DST, one is selected as a negotiation channel among the channels whose number operated by the adjacent cell for the BS itself is the smallest in the OPE channel of the selected DST (step S404).
    [0110] Then all adjacent cells operating the negotiation channel are determined as DST, channel negotiation is performed for all adjacent cells to obtain the OPE channel of the cell itself (step S405).
    [0111] When NO is judged in step S401 or S403, trade processing is terminated.
    [0112] That is, in negotiation processing, the OPE channel of the cell itself is selected according to the balance of the CS with the adjacent cell, so that balances do not become partial.
    [0113] Figure 7 is a sequence view showing in detail the operation of step S403, in which it is shown that BS1 is a trading source (SRC), and BS2 is a trading destination (DST).
    [0114] First, the SRC transmits a channel negotiation request (CN-REQ) which is a CBP information element in step S501. The CN-REQ includes an ID to identify that the information element is CN-REQ, a DST ID (BS2) which is a trade destination, a CS value of the present SRC (BS1), a CS value after the trading establishment, an operational channel number, and a trading channel number.
    [0115] Then, DST (BS2) which received the CN-REQ in step S502 transmits back a channel negotiation response (CN-RSP) which is a CBP information element to the SRC (BS1).
    [0116] The CN-RSP includes an ID to identify that the information element is CN-RSP, an ID of the SRC (BS1) which is a trading source, a CS value of the present DST (BS2)m a value of CS after trade establishment, an operational channel number, a channel number (trade channel number) to be released, a channel release time, etc.
    [0117] In step S503, SRC (BS1) transmits to DST (BS2) a channel negotiation response acknowledgment (CN-ACK) which is an information element of CBP after receiving the CN-RSP from all DSTs.
    [0118] CN-ACK includes an ID to identify that the information element is CN-ACK, an ID of the SRC (BS1) which is a source of negotiation, a CS value of the present DST (BS2), a CS value after trading is established, an operational channel number, a number and channel (trading channel number) to be released, a channel release time, etc.
    [0119] In step S504, DST transmits a toggle release (CN-REL) which is a CBP information element in order to notify the adjacent SRC cell and DST that the channel release after a release time lapse channel runs within a superframe defined in IEEE802.22.
    [0120] The CN-REL includes an ID to identify that the information element is CN-RSP, an ID of the SRC (BS1) which is a trading source, a CS value after trading is established, a channel number operational, a channel number (trading channel number) to be released, etc.
    [0121] As described above, the value of CS is merely an example, and is determined, for example, CS=NOPE, and the present invention may use various indices showing an operational channel number actually allocated by need of the operational channel within the cell.
    [0122] In the above embodiment, it was assumed, for simplicity, that R transmission capacities of all channels (also including a channel that must be obtained through channel negotiation) are equal. But really, since the maximum transmit power of the operational channel interference presently allocated by another or similar system and a transmission path state are different between the respective channels, the expression using the transmission capacity of each channel can be determined as:
    [0123] CS=NoPE/MaxcPE(WxA/(∑oPE(R)/NcPE)). In the Expression, ∑OPE denotes a total of currently allocated operational channels. The judgment index indicating whether the quality of service within the cell was satisfied can also be determined to be Nsat=CountifcPE[(∑oPExR/NcPE)>αA],
    [0124] The scope of the present invention is not limited to the implementation according to direct wireless communication between the BSs shown in the example above. MAC message including the above-described information element may be encapsulated and communicated via a return link or the like. And, the processing in figure 5 or figure 6, performed by SM of the base station can be performed by centralized control by a server, a network manager or similar arranged in the Internet. For example, the operational state of the channel of each BS can be monitored and controlled by the server or similar, and even if each BS asks the server for a channel, or even if the server instructs the BS to release the channel, the effect equivalent to the objective of the present invention can be achieved.
    [0125] The present invention is suitable for a system that can be used for a cognitive wireless system that commonly uses multiple frequency resources between multiple stations (base stations), and especially provides a best-effort type of service to multiple users.
    [0126] It should further be understood by one skilled in the art that, although the above description has been made of embodiments of the invention, the invention is not limited thereto, and various changes and modifications may be made without departing from the spirit of the invention. invention and the scope of the appended claims.
    权利要求:
    Claims (15)
    [0001]
    1. Channel usage method performed by a base station (10) configuring a cell (1) including wireless communication terminals (11, 12) by using a plurality of whitespace channels (f1-f5), characterized by comprising: a judgment process judging whether or not there is a uniquely available channel that is not an operational channel of adjacent base stations (20) within reserve channels usable by the base station (10); an impartiality process that, when there is at least one exclusively available channel in the judging process, determines the one exclusively available channel as a new operational channel of the base station (10); wherein the fairness process comprises: a first judgment step judges whether there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations between the base station reserve channels; when there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations, a first selection step selects the channel of the first judgment step as the new operational channel; and when there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations, a second judgment step judges whether the degree of satisfaction of the base station is minimal among adjacent base stations; a third judgment step judges whether there is a second cell that has a degree of satisfaction that is the same degree of satisfaction as the cell having the base station when the second judgment step determines that the degree of satisfaction of the base station is minimal between stations adjacent bases; a fourth judgment step judging whether the second cell has a greater number of spare channels than the base station cell when the third judgment step determines that there is a second cell that has a satisfaction degree that is the same satisfaction degree as the cell having the base station; and a second selection step selects any of the base station's reserve channels as the new operational channel for exclusive use when the base station's degree of satisfaction was judged to be minimal in the second judgment step and the base station cell has a lower number of reserve channels compared to the second cell having the satisfaction rating that is the same as the cell having the base station as judged in the third and fourth judgment steps; and a negotiation process that, when there is no channel other than the operational channel of adjacent base stations (20), determines, within adjacent base stations using various operational channels, a certain base station to request a release of a certain operational channel based on a comparison of degrees of satisfaction between the base station and the certain base station and causes the certain base station to fully release the certain operational channel; where each of the degree of satisfaction is defined as the same mathematical function of communication traffic within the cell (1), a transmission rate depending on a propagation environment between the base station (10) and the wireless communication terminals ( 11, 12) and a number of effectively allocated operating channels of white space, where in the negotiation process, the base station and a certain base station exchange information of their degrees of satisfaction with each other using an access control message in the middle or under the control of a centralized server, and where the negotiation process causes at least one of the adjacent base stations to completely release an operating channel with the condition that the satisfaction degree of the base station is minimal compared to the degree of satisfaction of the adjacent base station or the degree of satisfaction of the adjacent base station is invariant while repeating the series of processes after the judging process, and the degree of satisfaction of the mbos is not inverted even when the adjacent base station releases the operational channel.
    [0002]
    2. Channel usage method according to claim 1, characterized in that the negotiation process comprises: a first judgment stage judges whether the base station's degree of satisfaction is minimal compared to adjacent base stations; a destination selection step selecting a more satisfied base station of which the degree of satisfaction, after losing its any one operational channel, is maximum among adjacent base stations; a channel selection step selecting the certain operating channel of the most satisfied base station which is used by the least number of adjacent base stations; an execution step negotiating each of the certain base station using the certain operational channel to obtain the certain operational channel.
    [0003]
    3. Channel usage method according to claim 2, characterized in that the degree of satisfaction of a specific base station is calculated by: CS = NoPE/MaxcPE(W x λ / (R/NCPE)) Or CS = NOPE/∑CPE(W x λ /R) where CS represents the degree of satisfaction, NOpE represents the number of operational channels effectively allocated from specific base stations, NpCE denotes the number of wireless communication terminals in the cell of the specific base station , W denotes a weight of each wireless communication terminal depending on subscriber affiliation, à denotes the communication traffic of each terminal, R denotes the transmission capacity per channel of each terminal depending on its distance from the specific base station, and ∑ CPE denotes the total computation of all wireless communication terminals in the cell.
    [0004]
    4. Channel use method according to claim 2, characterized in that it further comprises: a self-judgment process that judges whether or not the quality of service in the base station cell is sufficient to avoid the negotiation process, when estimating a number of satisfied wireless endpoints in the cell, where the satisfaction of each wireless endpoint depends on subscriber affiliation.
    [0005]
    5. Channel usage method according to claim 2, characterized in that it further comprises: a waiting process waiting a specified period of time before the judging process, in order to collect a channel usage status at stations adjacent bases when receiving co-existence beacon or superframe header signals.
    [0006]
    6. Channel usage method according to claim 5, characterized in that it comprises: in the waiting process, the specified period of time increases with the increase in the degree of satisfaction or the number of effectively allocated operational channels of the base station for the purpose of providing a priority order to obtain an operational channel.
    [0007]
    7. Channel usage method according to claim 2, characterized by the fact that: in the execution step, the base station and a certain base station exchange information on their degrees of satisfaction with each other using a control message of access to the medium or under the control of the centralized server.
    [0008]
    8. Channel usage method according to claim 2, characterized in that: the degree of satisfaction of a specific base station is calculated by: CS = NoPE/MaxcPE(W x λ / (R/NCPE)) Or CS = NOPE/∑CPE(W x λ /R) where CS represents the degree of satisfaction, NOpE represents the number of operational channels effectively allocated from specific base stations, NpCE denotes the number of wireless communication terminals in the base station cell W denotes a weight of each wireless communication terminal depending on subscriber affiliation, à denotes the communication traffic of each terminal, R denotes the transmission capacity per channel of each terminal depending on its distance from the specific base station, and ∑CPE denotes the total computation of all wireless communication terminals in the cell, where in the negotiation process, the base station and certain base station exchange information of their degree of satisfaction with each other using access control message in half or under the control of the centralized server, and where in the execution step, the base station and a certain base station exchange information of their degree of satisfaction with each other using the medium access control message or under the control of the centralized server .
    [0009]
    9. Channel usage method according to claim 1, characterized in that the negotiation process comprises the steps of: transmitting an access control message to the medium of a channel negotiation request from the base station as a source negotiation to the certain base station as a negotiation destination, where the channel negotiation request medium access control message includes an ID that identifies the channel negotiation request, an ID of the negotiation destination, the degree of satisfaction of the trading source, the degree of satisfaction after the trading establishment and a number of trading channel; transmitting a medium access control message of a channel negotiation response from the negotiation destination that received the channel negotiation request to the negotiation source, the medium access control message of the channel negotiation response includes a ID that identifies the channel negotiation response, an ID of the negotiation source, the degree of satisfaction of the destination of the negotiation, the degree of satisfaction after the negotiation is established, a channel number to be released, and a channel release time ; transmitting an access control message to the medium of a channel negotiation response acknowledgment from the negotiation source to the negotiation destination; and transmitting an access control message to the medium of a channel release from the trade destination to the trade source to notify the trade source and any cells adjacent to the trade destination.
    [0010]
    10. Channel usage method according to claim 2, characterized in that the negotiation process comprises the steps of: transmitting an access control message to the medium of a channel negotiation request from the base station as a source negotiation to the certain base station as a negotiation destination, where the channel negotiation request medium access control message includes an ID that identifies the channel negotiation request, an ID of the negotiation destination, the degree of satisfaction of the trading source, the degree of satisfaction after the establishment of trading and a number of trading channel; transmitting a medium access control message of a channel negotiation response from the negotiation destination that received the channel negotiation request to the negotiation source, the medium access control message of the channel negotiation response includes a ID that identifies the channel negotiation response, an ID of the negotiation source, the degree of satisfaction of the negotiation destination, the degree of satisfaction after the negotiation is established, a channel number to be released and a channel release time ; transmitting an access control message to the medium of a channel negotiation response acknowledgment from the negotiation source to the negotiation destination; and transmitting an access control message to the medium of a channel release from the trade destination to the trade source to notify the trade source and any cells adjacent to the trade destination.
    [0011]
    11. Channel use method according to claim 1, characterized in that the degree of satisfaction decreases with an increase in the number of wireless communication terminals.
    [0012]
    12. Multi-channel wireless communication system characterized by the fact of understanding; a plurality of base stations (10) configuring a cell (1) including wireless communication terminals (11, 12) by use of a single or a plurality of white space channels (f1-f5), and a management device managing information on a spare channel usable by each of the plurality of base stations; and wherein the management device judges, for a base station, whether there is an exclusively available channel that is not operated by adjacent base stations (20) that are adjacent to a base station within the reserve channels usable by a base station, and when there is at least one uniquely available channel judged in the management device, the management device determines the uniquely available channel as a new base station operational channel in accordance with an impartiality process, wherein the impartiality process includes: a first judgment step judges whether there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations between the base station reserve channels; when there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations, a first selection step selects the one channel of the first judgment step as the new operational channel; and when there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations, a second judgment step judges whether the degree of satisfaction of the base station is minimal among adjacent base stations; a third judgment step judges whether there is a second cell that has a degree of satisfaction that is the same degree of satisfaction as the cell having the base station when the second judgment step determines that the degree of satisfaction of the base station is minimal between stations adjacent bases; a fourth judgment step judging whether the second cell has a greater number of spare channels than the base station cell when the third judgment step determines that there is a second cell that has a satisfaction degree that is the same satisfaction degree as the cell having the base station; and a second selection step selects any of the base station's reserve channels as the new operational channel for exclusive use when the base station's degree of satisfaction was judged to be minimal in the second judgment step and the base station cell has a lower number of reserve channels compared to the second cell having the satisfaction rating that is the same as the cell having the base station as judged in the third and fourth judgment steps; when there is no uniquely available unoperated channel, the management device selects a certain base station to which a request is made for full release of a certain operational channel based on a comparison of degrees of satisfaction between a certain base station and a certain base station, where each of the degree of satisfaction is determined as the same mathematical function of communication traffic within the cell depending on a propagation environment between the base station (10) and the wireless communication terminals (11, 12) and a number of the operational channels effectively allocated white space, and perform channel negotiation with the selected base station; and wherein the management device causes at least one of the adjacent base stations to fully release an operational channel with the condition that the satisfaction rating of one base station is minimal compared to the satisfaction rating of the adjacent base station or the adjacent base station's degree of satisfaction is invariant while repeating the series of processes after the judging process, and the degree of satisfaction of both is not reversed even when the adjacent base station releases an operational channel.
    [0013]
    13. Base station configuring a cell that includes wireless communication terminals (11, 12) by using a plurality of channels of a frequency of a blank, characterized in that it comprises: a channel management unit (107) which judges whether there is an exclusively available channel that is not operated by adjacent base stations (20) within reserve channels that are determined by spectral sensing and usable by the base station (10), and when there is at least one exclusively available channel, determined if a channel is exclusively available as a new operational channel from the base station (10), and when there is no channel that is not operated, a certain base station is determined to request a release of a certain operational channel based on a comparison of the degrees of satisfaction between the base station and a certain base station and the degree of satisfaction calculated, for each base station (10) and the adjacent base stations (20), is defined as a function of a traffic communication ego within a cell, a transmission rate depending on a propagation environment between the base station (10) and wireless communication terminals (11, 12) and a number of effectively allocated operational channels, and causes the certain base station frees the operational channel from the blank; and wherein the channel management unit includes: a first judgment step judges whether there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations between the base station reserve channels; when there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations, a first selection step selects the one channel of the first judgment step as the new operational channel; and when there is at least one channel that is neither an operational channel nor a reserve channel of adjacent base stations, a second judgment step judges whether the degree of satisfaction of the base station is minimal among adjacent base stations; a third judgment step judges whether there is a second cell that has a degree of satisfaction that is the same degree of satisfaction as the cell having the base station when the second judgment step determines that the degree of satisfaction of the base station is minimal between stations adjacent bases; a fourth judgment step judging whether the second cell has a greater number of spare channels than the base station cell when the third judgment step determines that there is a second cell that has a satisfaction degree that is the same satisfaction degree as the cell having the base station; and a second selection step selects any of the base station's reserve channels as the new operational channel for exclusive use when the base station's degree of satisfaction was judged to be minimal in the second judgment step and the base station cell has a lower number of reserve channels compared to the second cell having the satisfaction rating that is the same as the cell having the base station as judged in the third and fourth judgment steps.
    [0014]
    14. Base station according to claim 13, characterized in that the channel management unit further comprises: a first judgment stage judges whether the base station's degree of satisfaction is minimal compared to adjacent base stations; a destination selection step selecting a more satisfied base station of which the degree of satisfaction, after losing its any one operational channel, is maximum among adjacent base stations; a channel selection step selecting the right channel of operation of the most satisfied base station which is used by the least number of adjacent base stations; an execution step negotiating each from the certain base station using the certain operational channel to obtain the certain operational channel, wherein in the execution step, the base station and the certain base station exchange information of their degree of satisfaction with each other using a access control message to the medium or under the control of the centralized server, and wherein in the execution step, at least one of the adjacent base stations completely frees up an operational channel with the condition that the satisfaction degree of the base station is minimum in comparison with the satisfaction degree of the adjacent base station or the satisfaction degree of the adjacent base station is invariant while repeating the series of processes, and the satisfaction degree of both is not inverted, even when the adjacent base station releases the operational channel.
    [0015]
    15. Base station according to claim 13, characterized in that the degree of satisfaction decreases with an increase in a number of wireless communication terminals.
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    法律状态:
    2013-11-26| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-05-26| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04W 72/04 Ipc: H04W 16/04 (2009.01), H04W 72/04 (2009.01), H04W 1 |
    2020-05-26| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-11-03| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-01-11| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 11/01/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012004783|2012-01-13|
    JP2012-004783|2012-01-13|
    JP2012130682A|JP5921345B2|2012-01-13|2012-06-08|Multi-channel wireless communication system, base station, channel utilization method|
    JP2012-130682|2012-06-08|
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