WO2009084464A1 - 無線通信方法、無線通信装置、無線通信用プログラムおよび無線通信システム - Google Patents
無線通信方法、無線通信装置、無線通信用プログラムおよび無線通信システム Download PDFInfo
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- WO2009084464A1 WO2009084464A1 PCT/JP2008/073134 JP2008073134W WO2009084464A1 WO 2009084464 A1 WO2009084464 A1 WO 2009084464A1 JP 2008073134 W JP2008073134 W JP 2008073134W WO 2009084464 A1 WO2009084464 A1 WO 2009084464A1
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- wireless communication
- observation
- radio
- observation information
- frequency
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
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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
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
Definitions
- Wireless communication method Wireless communication apparatus, wireless communication program, and wireless communication system
- the present invention relates to a wireless communication system, a wireless communication method, a wireless communication apparatus, and a wireless communication program having a function of recognizing a surrounding wireless environment, and in particular, a wireless communication method in which a plurality of wireless devices cooperate to recognize a wireless environment.
- the present invention relates to a wireless communication device, a wireless communication program, and a wireless communication system.
- Patent Document 1 WO 2 0 0 4 0 7 5 4 3 8 or Patent Document 2: Patent No. 3 6 7 0 4 4 5).
- Patent Document 2 Patent No. 3 6 7 0 4 4 5.
- the cognitive radio it recognizes the surrounding radio environment and optimizes radio parameters according to the radio environment.
- the cognitive radio system can share the same frequency band as the secondary system, improving the frequency utilization efficiency.
- the primary system preferentially uses the pre-assigned frequency band and the secondary system does not affect the primary system. Therefore, the secondary system avoids interference to the primary system by using a frequency band that is not used by the primary system or by controlling the transmission power so that it is less than the amount of interference allowed by the primary system. Is required. For this reason, the secondary system must accurately recognize the usage status of the primary system in the frequency band to be used.
- the secondary system recognizes frequency band usage. Can be classified. One is to detect primary system communication in a wide range of frequency band candidates that can be shared with the secondary system before starting communication. The other is detection of the primary system that has started communication in the frequency band used by the secondary system. In either case, when communication of the primary system is detected, the secondary system needs to take measures to avoid interference with the primary system in the frequency band.
- Spectral sensing includes a method based on power detection that is determined by the magnitude of the received signal power obtained by time averaging, and a method that uses the feature quantity contained in the transmission signal of the primary system for detection.
- periodic stationarity and pi-port signals included in the transmission signal of the primary system can be used (for example, Non-Patent Document 1: D Cabric, SM ishra, and RW Brodersen, “Implementation”). issues in spectrum sensing for cognitive radios, "Proc of the Thirty-Eighth Asi lomar Conference on Signals, Systems and Computers, November 2004.).
- Non-Patent Document 2 Shridhar M Mishra, Anant Sahai and Robert W Brodersen,
- Figure 1 shows a conceptual diagram of the cooperative sensing system.
- the wireless device 100 and the wireless device 110 communicate with each other as a primary system.
- Radios 2 0 0, 2 1 0, 2 2 0, 2 3 0 and 2 4 0 share the same frequency band as the primary system as a secondary system.
- the secondary system radios 2 0 0, 2 1 0, 2 2 0, 2 3 0, 2 4 0 are spectral sensing functions.
- a cooperative group is established to cooperate with each other.
- the wireless device 200 functions as a main node, controls each wireless device in the cooperative group, and makes a determination as the cooperative group regarding the detection of the presence / absence of communication of the primary system.
- the other radios 2 1 0, 2 2 0, 2 3 0, and 2 4 0 function as slave nodes that perform cooperative sensing operations according to instructions from the master node.
- the basic operation of cooperative sensing is to perform spectral sensing for each frequency band targeted by multiple slave nodes 2 10, 2 2 0, 2 3 0, 2 4 ⁇ belonging to the cooperative group.
- Each of the results notifies the main node to 200, and the main node integrates the notified detection information to determine whether or not there is communication in the primary system in the target frequency band.
- the spectrum sensing method used in the slave node may be the method shown in Non-Patent Document 1 or other methods, and there is no particular limitation.
- detection information collected from a part of the slave nodes may be used, or in addition to the detection information collected from the slave nodes, a specification performed by the master node itself is used. Information detected by torsensing may also be used.
- Patent Documents 1 and 2 notify the transmission parameters to be used and the operating environment, and do not transmit observation results.
- an object of the present invention is to provide a technique by which a secondary system can exchange sensing information without affecting the communication of the primary system.
- Another object of the present invention is to provide a system that allows radio equipment in the secondary system to efficiently exchange radio communication resources and exchange necessary sensing information.
- an observation result is generated by observing its own or surrounding wireless communication environment, observation information representing the observation result is converted into a parameter used for wireless communication, and the parameter is used.
- a wireless communication method is provided that transmits the observation information.
- means for observing a wireless communication environment of itself or surroundings to generate observation results means for converting observation information representing the observation results into parameters used for wireless communication, and There is provided a wireless communication device comprising means for transmitting the observation information using the parameter.
- a cognitive radio communication system including a first radio communication device and a second radio device, wherein the first radio communication device observes a surrounding radio communication environment.
- a cognitive radio communication system characterized by this can be obtained. According to the present invention, it is possible to provide a method in which the secondary system exchanges sensing information without affecting the communication of the primary system.
- the radio in the secondary system can efficiently use radio resources. Can be used to collect necessary sensing information.
- FIG. 1 is a diagram schematically showing a form in which a radio in a secondary system coexists with a radio in a primary system to which the present invention is applied and performs cooperative sensing.
- FIG. 2 is a block diagram showing a configuration example of a main node that performs cooperative sensing in the first or second embodiment of the present invention.
- FIG. 3 is a block diagram showing a configuration example of the slave node detection / determination means included in the master node of FIG.
- FIG. 4 is a block diagram showing a configuration of a slave node that performs cooperative sensing in the first or second embodiment of the present invention.
- FIG. 5 is a diagram showing an example of a detected power allocation map to OFDM subcarriers in the first exemplary embodiment of the present invention.
- FIG. 6 shows an operation of allocating the sensing result of the slave node to the subcarrier and transmitting it in the first embodiment of the present invention, and extracting the slave node sensing result power level from the subcarrier position at the master node.
- a conceptual diagram is shown.
- FIG. 7 is a diagram showing an example of an allocation map to the OF DM subcarrier according to the detected power frequency distribution in the second exemplary embodiment of the present invention.
- FIG. 8 is a block diagram illustrating a configuration example of a main node performing cooperative sensing in the third embodiment of the present invention.
- FIG. 9 is a block diagram illustrating a configuration example of a slave node performing cooperative sensing in the third embodiment of the present invention.
- the master node 20 0 and the slave nodes 2 1 0 to 2 4 0 constituting the cooperative group Take an example of doing
- OF DM orthogonal frequency division multiplexing
- OF DMA orthogonal frequency division multiple access
- FIG. 2 shows a configuration example of the main node 200 in the first embodiment of the present invention.
- the main node 2 0 0 in the first embodiment of the present invention includes an antenna 2 0 0 1, a receiving means 2 0 0 3, a switch 2 0 0 5, a primary signal sensing means 2 0 0 6, a slave Node detection determination means 2 0 0 7 is provided.
- the receiving means 20 0 3 receives the primary system signal and the power system signal. That is, for example, signals transmitted from the primary system radios 1 0 0 and 1 1 0 and signals transmitted from other nodes belonging to the cooperative group, for example, slave nodes 2 1 0 to 2 4 0 can be received. .
- the switch 2 0 5 switches the connection destination with the processing means at the subsequent stage according to the purpose of processing the output from the receiving means 2 0 3.
- the switch 2 0 0 5 is connected to the primary signal sensing means 2 0 6 when the primary node 2 0 0 itself senses the primary signal, and the primary node 2 0 0 is connected to the secondary node.
- the slave node detection determination means 2 0 7 is connected.
- the primary signal sensing means 2 0 0 6 detects the presence / absence of communication of the primary system, received power intensity (level), traffic, etc. in the frequency band targeted for spectrum sensing. The result is passed to the slave node detection determination means 2 0 07.
- the slave node detection determining means 2 0 0 7 takes out the information of the spectrum sensing result at each slave node included in the received signal from the slave nodes 2 1 0 to 2 4 0, and further, the primary signal sensing means 2 0 Using the spectral sensing results performed in 06, comprehensively determine whether or not there is communication of the primary system in the target frequency band within the cooperative group. However, in the comprehensive judgment, it is desirable to consider the result of spectral sensing performed by the primary signal sensing means 2 0 0 6 itself, but this is not always necessary. It is also possible to use only the information of the sensing result.
- FIG. 3 shows a configuration example of the slave node detection / determination means 2 0 07 in the primary node 2 0 0 according to the first embodiment of the present invention.
- the slave node detection determination means 2 0 0 7 includes discrete Fourier transform (FFT) processing means 2 0 1 0, subcarrier signal power determination means 2 0 1 1, cooperative sensing comprehensive determination means 2 0 1 2, primary signal It has a detection result storage means 2 0 1 3.
- FFT discrete Fourier transform
- the received signal obtained from the receiving means 2 0 0 3 is converted into a signal on the frequency axis by the FFT processing means 2 0 1 0.
- the received signal from the slave node is loaded with information of the spectrum sensing result at the slave node of each OF DM subcarrier, and is obtained from the signal on the frequency axis. Can be extracted.
- the subcarrier signal power determination means 2 0 1 1 can obtain sensing information at the slave node by observing the subcarrier component of the received signal.
- the cooperative sensing comprehensive judgment means 2 0 1 In 2 Using the obtained sensing information at each slave node and the main node 2 0 0 obtained from the primary signal sensing means 2 0 0 6, the cooperative sensing comprehensive judgment means 2 0 1 In 2, the surrounding frequency usage environment in the cooperative group, for example, the presence or absence of the primary system signal, is comprehensively determined. Also, the cooperative sensing comprehensive judgment result is stored in the primary signal detection storage means 2 0 1 3, and information stored in the past in the subsequent cooperative sensing comprehensive judgment.
- FIG. 4 shows a configuration example of the slave node 2 10 in the first embodiment of the present invention.
- the configuration of the other slave nodes 2 2 0 to 2 4 0 is the same as that of the slave node 2 1 0.
- the slave node 2 1 0 in the first embodiment of the present invention includes an antenna 2 1 0 1, a transmission / reception separating unit 2 1 0 2, a receiving unit 2 1 0 3, a transmitting unit 2 1 0 4, Primary signal sensing means 2 1 0 5 and inverse discrete Fourier transform (IFFT) processing means 2 1 0 7 and subcarrier mapping means 2 1 0 8.
- IFFT inverse discrete Fourier transform
- the receiving means 2 1 0 3 performs reception processing of signals transmitted from other nodes belonging to the cooperative group, for example, the main node 2 0 0.
- the primary signal sensing means 2 1 0 5 detects the presence / absence of communication of the primary system, received power intensity (level), traffic, etc. in the frequency band targeted for spectrum sensing.
- received power intensity level
- traffic etc.
- the present invention is not limited to this.
- the subcarrier mapping means 2 10 8 performs signal mapping to the OF DM subcarrier corresponding to the detected power information based on the sensing result obtained from the primary signal sensing means 2 1 0 5.
- Figure 5 shows an example of a map of the detection power allocation to the OF DM subcarrier.
- each subcarrier Fl ⁇ f 6 of OF DM is associated with power level P A to P F detected, for example, the power level detected by the receiving signal machine there by P D Mapped to subcarrier f4.
- this mapping process can be regarded as a function of quantizing received power information (received power intensity) and encoding it into a subcarrier number.
- the detected received power level is quantized to any one of the quantization levels P A to P F with a uniform quantization width that is evenly divided within the dynamic range, and is associated with each quantization level. Converted to subcarrier.
- the subcarrier mapping means 2 10 8 generates an OF DM signal having a signal of only the subcarrier component corresponding to the detected power level.
- the OFDM signal is converted into a time-axis signal by IFFT processing means 2 1 0 7 and transmitted to the main node via the transmitter 2 10 4.
- the slave nodes 2 1 0 to 2 4 0 are usually located at different locations, the reception power levels detected by the slave nodes are likely to be different from each other. Therefore, if the detected power levels P A to P F are associated with OF DM subcarriers f 1 to f 6, the OF DM signal transmitted from each slave node is likely to have different subcarrier components. Become. As a result, sensing information can be exchanged between the secondary system radios without affecting the communication of the primary system. [Receiving sensing information at the main node]
- each slave node belonging to the cooperative group performs spectrum sensing in this way, and the detected power level information is used as a signal of a predetermined subcarrier component.
- Send OF DM When these OFDM signals are transmitted simultaneously from multiple slave nodes, the receiving master node receives an OF DM signal in which the signal is included only in the subcarrier component corresponding to the power level detected by the surrounding slave nodes. It will be. In the main node, it is possible to obtain information on the sensing results of the surrounding slave nodes by observing the subcarrier component of the received OFDM signal.
- Figure 6 shows an example of this situation.
- the figure shows that the detected power levels of the sub-nodes 2 10 to 2 40 as a result of spectrum sensing are P A , P B , P D , and P A , respectively. Mapping and simultaneous OFDM transmission are shown.
- the main node when receiving the OF DM signal simultaneously transmitted from each of the slave nodes 2 10 to 2 40, the main node observes signal components in the subcarriers fl, f 2 and f 4.
- the secondary system efficiently recognizes the primary system and the secondary system efficiently allocates radio resources without affecting the communication of the primary system. It is possible to exchange sensing information using it.
- the master node and the slave node are distinguished from each other.
- all the radios may have the same configuration, and each radio may be operable as a master node or a slave node. ,.
- the transmitter radio may function as the main node.
- the example of observing the surrounding communication environment and transmitting the observation result has been described.
- the result of observing the state of the own device, for example, the remaining battery level may be notified. ,.
- one unit at the time of quantizing the power level detected as a result of spectrum sensing is mapped to 1 OF DM sub-carrier, but the sub unit to which the one unit is assigned is mapped. It is possible to have multiple career candidates. For example, if four subcarriers of OF DM subcarriers f 1 0 0, fl 0 1, fl 0 2, and f 1 0 3 are assigned to the detected power level P x of the spectrum sensing result, the detected power level ⁇ there slave node which was a P x selects one Sabukiyari ⁇ of the f 1 0 0 ⁇ f 1 ⁇ 3 for example randomly.
- the collision probability at the time of reception at the main node can be reduced to 1 Z 4 compared to the case where there is only one allocation candidate subcarrier. This can further reduce the possibility that the exchange of sensing information between the radios of the secondary system will affect the communication of the primary system.
- the quantization width of the spectrum sensing result can be varied according to the frequency distribution.
- subcarriers with signal components can be distributed in the received signal at the main node by narrowing the quantization range at higher frequencies.
- the subcarrier mapping as shown in the first or second embodiment of the present invention can be made variable by an instruction from the main node.
- FIG. 8 shows a configuration example of the main node 2 0 1 according to the third embodiment of the present invention.
- the main node 2 0 1 according to the present embodiment extends the switch 2 0 0 5 to the main node 2 0 0 in the first embodiment shown in FIG.
- Subcarrier map control means 2 0 0 8 secondary signal modulation / demodulation means 2 0 9, and transmission means 2 0 0 4 are provided.
- the subcarrier map control means 2 0 8 uses the information given from the slave node detection determination means 2 0 7 and uses the sub-carrier map control means 2 0 0 8 as described in the first or second embodiment of the present invention. Determine the carrier pinning.
- the information given from the slave node detection determination means 2 0 0 7 is the sensing information obtained from each slave node as a result of cooperative sensing, the result of cooperative primary comprehensive determination, or in addition to these, primary signal detection Results Any one or combination of past cooperative sensing information stored in the storage means 2 0 1 3 may be used.
- the subcarrier map control means 2 0 08 may use the result of spectral sensing performed by the primary signal sensing means 2 0 6 itself when determining the subcarrier mapping.
- the set subcarrier mapping control information (parameter conversion index) is modulated by the secondary signal modulation / demodulation means 20 0 9 and transmitted to each slave node via the transmission means 2 0 4.
- Figure 9 shows an example of the configuration of the corresponding slave node 2 1 1.
- the slave node 2 1 1 according to the present embodiment is provided with subcarrier mapping means 2 1 0 8 relative to the primary node 2 1 0 according to the first embodiment shown in FIG.
- it has secondary signal demodulation means 2 1 0 6.
- the secondary signal demodulating means 2 1 0 6 extracts subcarrier mapping control information from the secondary signal received from the master node, and sets the subcarrier mapping according to the control information. .
- the subcarrier mapping can be flexibly changed, which makes it possible to optimize the subcarrier arrangement having the signal component of the received signal at the main node. It becomes possible. This further reduces the possibility that the exchange of sensing information between the radios of the secondary system will affect the communication of the primary system.
- this embodiment Uses and determines the interrelationship between the master node and the surrounding slave nodes based on the received power when making a comprehensive judgment on cooperative sensing at the master node. This is because the slave node keeps the transmission power constant when transmitting the detected power level information, which is the spectrum sensing result, and the received signal strength at the master node varies depending on the channel conditions in the radio section. Use. This channel condition (received signal strength) generally varies depending on the distance of the wireless section, so it is possible to estimate the approximate distance of the wireless section.
- the master node in addition to the sensing result information in the slave node carried on the received subcarrier number, it is possible to add a comprehensive judgment function using this signal strength information.
- the primary node can obtain auxiliary information such as the location information of the slave node by another means, it is of course possible to make comprehensive judgment using these.
- the slave node determines whether to transmit the power detection information to the master node based on a certain threshold with respect to the spectrum sensing result, and sends it to the master node. It is transmitted only when it is determined that notification of detected power information is necessary. This allows more efficient use of wireless resources within the secondary system.
- the spectrum sensing information is transmitted from the slave node in the cooperative group.
- the present invention is not limited to this.
- an application method for multiplexing and transmitting the spectrum sensing detection result corresponding to the time slot on the time axis It is also possible to use an application method in which multiplex transmission is performed corresponding to a spectrum spread code or the like.
- a combination of two or more of OF DM subcarrier, time slot and spectrum spreading code may be used as a parameter.
- the present invention is not limited to cognitive radio in which the frequency band is secondarily used, but can also be used for frequency sharing in ensuring the quality of the current wireless LAN.
- the present invention is not limited to the case where there is an existing system to which a frequency band is fixedly allocated, but also one of the two systems (the other is) in which (loose) dynamic frequency allocation is performed. Can also be applied to In addition, the present invention can be applied to one of two systems that share a frequency band and that are not particularly prioritized.
- a radio communication apparatus may include means for using orthogonal frequency multiplexing subcarriers as parameters.
- means for using a time slot as the parameter may be provided.
- a means for using a vector spreading code as a parameter may be provided.
- a wireless communication apparatus may include means for observing received power intensity by surrounding wireless communication as means for generating an observation result.
- a means for generating observation results a means for observing traffic by surrounding wireless communication may be provided.
- a means for generating the observation result a means for observing the remaining battery level may be provided.
- the means for obtaining the measurement result may include means for quantizing the measurement value to obtain the measurement result.
- the means for obtaining the measurement result includes means for quantizing the measured received power intensity with an equal quantization width to obtain the observation result
- the means for converting into parameters comprises means for associating the measurement information representing the observation result with a single frequency subcarrier associated with each quantization level
- the means for transmitting the observation information comprises Means may be provided for orthogonal frequency multiplex transmission with only the frequency subcarrier having a signal component.
- the means for obtaining the measurement result includes means for quantizing the measured received power intensity with an equal quantization width to obtain the observation result
- the means for converting into parameters comprises means for associating the measurement information representing the observation result with one frequency subcarrier group associated with each quantization level, and the means for transmitting the observation information comprises the frequency subcarrier.
- the means for obtaining the measurement result quantizes the measured received power intensity with an arbitrary non-uniform quantization width to obtain the observation result.
- means for converting into the parameter comprises means for associating the measurement information representing the observation result with a single frequency subcarrier or a group of frequency subcarriers each associated with a quantization level,
- the means for transmitting observation information comprises means for orthogonal frequency multiplex transmission with only one frequency subcarrier selected from the single frequency subcarrier or the one frequency subcarrier group having a signal component. It's okay.
- the wireless communication apparatus has a quantization width that is narrowed as the frequency is high, and the means for obtaining the measurement result is determined based on the frequency distribution information of the received power intensity obtained in advance.
- Means may be provided for performing orthogonal frequency multiplexing transmission with a signal component included in only one subcarrier arbitrarily selected from the carrier or one frequency subcarrier group.
- the means for transmitting observation information may include means for transmitting simultaneously with other wireless communication apparatuses.
- a wireless communication apparatus includes: means for receiving a signal transmitted by another wireless communication apparatus; and a surrounding wireless communication environment observed on the transmission side from the received signal. Using the means to extract the received observation information representing the observation results, the means for observing the surrounding wireless communication environment and generating the self-observation information representing the observation results, and the self-observation information and the received observation information. Means for determining surrounding wireless communication environments may be provided.
- the wireless communication device is a device that observes a surrounding wireless communication environment and generates self-observation information representing an observation result, and is transmitted by another wireless communication device.
- a means for receiving a signal a means for extracting received observation information representing an observation result of the surrounding wireless communication environment observed on the transmission side from the received signal, and at least one of the own observation information and the received observation information.
- the wireless communication apparatus may include means for determining a parameter conversion index for converting the observation information into parameters used for wireless communication, and means for transmitting the determined parameter conversion index.
- a wireless communication apparatus includes means for estimating a relative distance from a transmission-side wireless communication apparatus based on received signal power of a received signal, and determines a wireless communication environment
- the means may comprise means for determining the surrounding wireless communication environment using the estimated relative distance in addition to the own observation information and the reception observation information.
- a wireless communication apparatus may include means for comparing the measurement result with a determination criterion to determine whether or not to transmit observation information.
- the means for determining whether transmission is possible determines that transmission is possible
- the means for transmitting observation information can transmit the observation information.
- the means for transmitting the observation information is based on characteristics of other wireless communication systems to which a frequency used for wireless communication is preferentially assigned.
- Means for controlling the transmission power may be provided.
- a wireless communication apparatus according to another embodiment of the present invention may be realized by causing a computer to execute the above-described procedure or to realize a function.
- the operation is performed while sharing the same frequency band in the presence of a primary system to which the frequency band is preferentially assigned.
- a wireless communication system can be realized.
Abstract
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JP2009548007A JP5182713B2 (ja) | 2007-12-28 | 2008-12-12 | 無線通信方法、無線通信装置、無線通信用プログラムおよび無線通信システム |
US12/808,721 US8699362B2 (en) | 2007-12-28 | 2008-12-12 | Radio communication method, radio communication device, radio communication program, and radio communication system |
EP08868266.1A EP2228932B1 (en) | 2007-12-28 | 2008-12-12 | Radio communication method, radio communication device and radio communication system |
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US8160004B2 (en) * | 2009-06-30 | 2012-04-17 | Motorola Solutions, Inc. | Method for optimizing spatial diversity gain of a set of nodes used for cooperative sensing |
JP5765758B2 (ja) | 2010-10-20 | 2015-08-19 | 国立大学法人電気通信大学 | 通信装置、通信方法、および通信システム |
CN102355738B (zh) * | 2011-06-29 | 2014-05-07 | 中国人民解放军理工大学 | 基于协同中继的认知simo网络接入方法 |
CN104205909A (zh) * | 2012-06-06 | 2014-12-10 | 日电(中国)有限公司 | 用于认知无线电网络的解码反馈感测的方法和装置 |
CN103401622B (zh) * | 2013-08-01 | 2015-06-03 | 哈尔滨工业大学 | 一种在存在认知用户信号的情况下感知主用户信号的联合频谱感知方法 |
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