WO2020144940A1 - 通信装置及び通信方法 - Google Patents
通信装置及び通信方法 Download PDFInfo
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- WO2020144940A1 WO2020144940A1 PCT/JP2019/045192 JP2019045192W WO2020144940A1 WO 2020144940 A1 WO2020144940 A1 WO 2020144940A1 JP 2019045192 W JP2019045192 W JP 2019045192W WO 2020144940 A1 WO2020144940 A1 WO 2020144940A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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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
- 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
- H04L5/0012—Hopping in multicarrier systems
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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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
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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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
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- the technology disclosed in this specification relates to a communication device and a communication method for transmitting and receiving wireless signals.
- a technology is used in which a channel used by an access point is selected and a communication terminal scans all channels to search for access points existing in the vicinity. Moreover, the communication terminal can acquire the information about the network by transmitting the probe request to the access point without performing the channel scan and receiving the probe response from the access point operating in the channel.
- the access point transmits a scanning signal different from the beacon signal to shorten the scanning time of the communication terminal.
- the access point transmits a discovery beacon at a cycle shorter than the beacon interval, and periodically frequency hops the same signal, so that the presence of the access point can be detected even when the communication terminal scans only a specific channel.
- Patent Document 1 A proposal has been made for a method that enables discovery (see Patent Document 1).
- An object of the technology disclosed in this specification is to provide a communication device and a communication method that operate as an access point or a communication terminal in a network operated by connecting one or more communication terminals to the access point.
- the first aspect of the technology disclosed in this specification is A first signal processing unit for generating a first signal; A second signal processing unit for generating a second signal including information about the first signal; A communication unit that simultaneously transmits the first signal and the second signal; It is a communication device comprising.
- the communication device functions as an access point in a wireless network, and the first signal processing unit generates a beacon signal for notifying a subordinate communication terminal as the first signal, The second signal processing unit generates, as the second signal, a discovery signal to notify the communication terminal before connection.
- the second signal includes information about a channel used to transmit the first signal, and further, the transmission length of the second signal, the transmission length of the first signal, or the repetition of the second signal. It includes at least one of the numbers. Therefore, the other communication device can specify the channel used for transmitting the first signal by scanning an arbitrary channel and receiving the second signal, and thus the other communication device according to the first aspect. It is possible to shorten the time required to receive the first signal from the communication device.
- the second aspect of the technology disclosed in this specification is A first signal processing step of generating a first signal; A second signal processing step of generating a second signal containing information about said first signal; A communication step of simultaneously transmitting the first signal and the second signal, Is a communication method having.
- the third aspect of the technology disclosed in this specification is A communication unit that transmits and receives radio signals on any of a plurality of frequency channels, A control unit that controls switching of channels that the communication unit should transmit and receive, A second processing unit that processes a second signal received from another communication device to obtain information about a channel used by the other communication device; A first processing unit that processes a first signal received from the other communication device to obtain information about the other communication device; Equipped with, The control unit is a communication device that causes the first channel to stand by in the use channel specified based on the second signal.
- the fourth aspect of the technology disclosed in this specification is Processing a second signal received from another communication device to obtain information about a channel used by the other communication device; Waiting for the first signal on the used channel identified based on the second signal; Processing a first signal received from the other communication device to obtain information about the other communication device; Is a communication method having.
- an access point transmits a discovery signal including information capable of identifying a used channel by using a channel other than the used channel. By performing the scan operation with, the access point can be efficiently searched.
- an access point transmits a discovery signal and a beacon signal as one radio signal (one OFDM signal), thereby transmitting a plurality of discovery signals to channels other than the used channel. It can be assigned and transmitted, and the scanning time of the communication terminal can be shortened.
- the access point can simultaneously transmit the discovery signal and the beacon signal with a simple device configuration, and the communication terminal Can detect a discovery signal with a simple device configuration.
- FIG. 1 is a diagram showing a configuration example of a communication system.
- FIG. 2 is a diagram showing a functional configuration example of the communication device 200 that operates as an access point.
- FIG. 3 is a diagram showing a functional configuration example in the wireless communication unit 202.
- FIG. 4 is a diagram showing another functional configuration example in the wireless communication unit 202.
- FIG. 5 is a diagram showing a functional configuration example of the communication device 500 that operates as a communication terminal.
- FIG. 6 is a diagram showing a functional configuration example in the wireless communication unit 502.
- FIG. 7 is a diagram for explaining an example of a scanning method (passive scanning).
- FIG. 8 is a diagram for explaining another example of the scanning method.
- FIG. 1 is a diagram showing a configuration example of a communication system.
- FIG. 2 is a diagram showing a functional configuration example of the communication device 200 that operates as an access point.
- FIG. 3 is a diagram showing a functional configuration example in the wireless communication unit 202.
- FIG. 9 is a diagram showing an example (Example 1) of a communication sequence performed in the communication system.
- FIG. 10 is a diagram showing an example of the frame format of the discovery signal.
- FIG. 11 is a diagram showing another frame format example of the discovery signal.
- FIG. 12 is a flowchart showing a processing procedure when the access point determines the number of channels to which the discovery signal is allocated.
- FIG. 13 is a flowchart showing a processing procedure when the access point generates an OFDM signal.
- FIG. 14 is a flowchart showing a processing procedure when the communication terminal receives an OFDM signal.
- FIG. 15 is a diagram showing an example of allocation of beacon signals and discovery signals (relationship between frequency and power).
- FIG. 16 is a diagram showing the relationship between time and frequency in the signal allocation example shown in FIG.
- FIG. 17 is a diagram showing an example of allocation of beacon signals and discovery signals (relationship between frequency and power).
- FIG. 18 is a diagram showing the relationship between time and frequency in the signal allocation example shown in FIG.
- FIG. 19 is a diagram showing an example of allocation of beacon signals and discovery signals (relationship between frequency and power).
- FIG. 20 is a diagram showing an example (Example 2) of a communication sequence performed in the communication system.
- FIG. 21 is a diagram showing a configuration example of the Capability information frame.
- FIG. 22 is a diagram showing a frame format example of the divided beacon signal 1.
- FIG. 23 is a diagram showing a frame format example of the divided beacon signal 2.
- FIG. 24 is a flowchart showing a processing procedure for the access point to transmit a divided beacon signal.
- FIG. 25 is a diagram showing an example of allocation of beacon signals and discovery signals (relationship between frequency and power).
- the scanning signal includes information that can identify the channel used by the access point, and is a signal that is mainly transmitted using a channel other than the channel used, and is also referred to as a “discovery signal” below.
- the access point allocates a plurality of discovery signals to channels other than the used channel by generating a discovery signal and a beacon signal as one OFDM (Orthogonal Frequency Division Multiplexing) signal with one transmitter. It is possible to send.
- OFDM Orthogonal Frequency Division Multiplexing
- the access point shortens the scan time of the communication terminal by switching the channel of the discovery signal in the OFDM signal even when the number of channels in which the discovery signal can be arranged is small due to the limitation of the transmission power of the transmitter itself. It is possible to do.
- FIG. 1 shows a configuration example of a communication system that transmits and receives radio signals.
- the illustrated communication system includes one access point (AP) and two communication terminals (STA).
- one communication terminal (STA1) is connected to the BSS (Basic Service Set) operated by the access point, while the other communication terminal (STA2) is still connected to any access point. Instead, you are scanning the surrounding access points.
- BSS Basic Service Set
- the access point sets one of the available frequency channels as a use channel and transmits a beacon signal to a communication terminal subordinate to the use channel. Further, in an embodiment described later, the access point transmits the discovery signal using a channel other than the used channel.
- the target to which the technology proposed in this specification is applied is not limited to the system configuration shown in FIG. It suffices that a condition exists in which there are a plurality of communication devices with which connections have been established and a peripheral terminal exists for each communication device, and the positional relationship between the communication terminals is not particularly limited as long as the condition is satisfied.
- FIG. 2 schematically shows a functional configuration example of the communication device 200 operating as an access point.
- the illustrated communication device 200 includes an antenna 201, a wireless communication unit 202, a control unit 203, and a signal processing unit 204.
- the control unit 203 centrally controls the entire device so that the communication device 200 operates as an access point.
- the control unit 203 determines the transmission time of the beacon signal and the discovery signal and the transmission channel.
- the signal processing unit 204 processes signals transmitted and received via the wireless communication unit 202.
- the signal processing unit 204 includes a beacon signal generation unit 205 that generates a beacon signal, a data processing unit 206 that performs processing of a data signal for communication, and a discovery signal generation unit 207 that generates a discovery signal. Contains.
- the beacon signal generation unit 205 and the discovery signal generation unit 207 each have a role of passing a bit sequence of information to be notified to the communication terminal to the wireless communication unit 202.
- the beacon signal includes information necessary for connection (association) to the wireless network (BSS) operated by the access point, and is transmitted using the channel used by the access point.
- the beacon signal may be in a frame format according to an existing wireless LAN standard such as IEEE 802.11, and detailed description thereof will be omitted here.
- the discovery signal is a signal including information that can identify the channel used by the access point, and is transmitted using a channel other than the channel used.
- the discovery signal may further include other information such as the transmission length of the discovery signal and the beacon signal, but details will be given later.
- the wireless communication unit 202 When transmitting a signal, the wireless communication unit 202 generates an OFDM signal from the bit sequence information generated by the signal processing unit 204, performs analog conversion and RF (Radio Frequency) processing, and outputs a transmission signal from the antenna 201. To generate.
- the wireless communication unit 202 generates one wireless signal (one OFDM signal) in which the beacon signal and the discovery signal are assigned to different frequency channels, and transmits the beacon signal and the discovery signal at the same time. It is configured. Specifically, the wireless communication unit 202 allocates a beacon signal and a discovery signal to specific channels based on the information received from the control unit 203, and further allocates a null signal to a channel where neither is allocated. Wireless signal is generated.
- FIG. 3 schematically shows a functional configuration example in the wireless communication unit 202. However, in the figure, a configuration example mainly dedicated to the transmission of a beacon signal and a discovery signal is shown.
- the wireless communication unit 202 When the wireless communication unit 202 receives a binary signal such as a beacon signal generated by the beacon signal generation unit 205 and a discovery signal generated by the discovery signal generation unit 207 from the signal processing unit 204, the beacon signal is encoded by the encoding unit 301 and the interleaver. After coding and interleaving in 302 and coding and interleaving the discovery signal in the coding unit 311 and interleaver 312, the subcarrier modulation unit 303 maps each subcarrier according to the subcarrier position information from the control unit 203. I do.
- an IFFT (Inverse Fast Fourier Transform) unit 304 performs an inverse Fourier transform
- a guard interval (GI) inserting unit 305 inserts a guard interval
- a symbol shaping unit 306 shapes each symbol to generate an OFDM signal. After that, the OFDM signal is converted to analog and up-converted to the RF band, and transmitted from the antenna 201.
- IFFT Inverse Fast Fourier Transform
- one transmitter can generate a beacon signal and a discovery signal as one OFDM signal. Therefore, according to the wireless communication unit 202 having the configuration shown in FIG. 3, it is possible to simultaneously transmit the beacon signal and the discovery signal on different channels with a simple device configuration. Also, the discovery signal may be mapped to multiple subcarriers.
- FIG. 4 schematically shows another functional configuration example in the wireless communication unit 202.
- a configuration example mainly dedicated to the transmission of a beacon signal and a discovery signal is shown.
- the wireless communication unit 202 encodes and interleaves the beacon signal by the encoding unit 401 and the interleaver 402, and further performs subcarrier modulation on a channel basis by the subcarrier modulation unit 403. Also, the discovery signal is encoded and interleaved by the encoding unit 411 and the interleaver 412, and further, the subcarrier modulation unit 413 performs subcarrier modulation in channel units. Then, the channel mapping unit 404 allocates the subcarriers of the beacon signal and the discovery signal to each channel according to the channel position information from the control unit 203.
- IFFT section 405 performs inverse Fourier transform
- guard interval insertion section 406 inserts a guard interval
- symbol shaping section 407 shapes each symbol to generate an OFDM signal. After that, the OFDM signal is converted to analog and up-converted to the RF band, and transmitted from the antenna 201.
- the beacon signal and the discovery signal are subcarrier-modulated for each channel, and then the signal is assigned to each channel.
- the discovery signal may be transmitted using a plurality of channels, and in this case, the channel mapping section 404 duplicates the discovery signal and maps it to a plurality of channels.
- one transmitter can generate a beacon signal and a discovery signal as one OFDM signal. Therefore, according to the wireless communication unit 202 having the configuration shown in FIG. 4, it is possible to simultaneously transmit the beacon signal and the discovery signal on different channels with a simple device configuration (same as above).
- FIG. 5 schematically shows the functional configuration of the communication device 500 that operates as a communication terminal.
- the illustrated communication device 500 includes an antenna 501, a wireless communication unit 502, a control unit 503, and a signal processing unit 504.
- the control unit 503 controls the entire device so that the communication device 500 operates as a communication terminal.
- the control unit 503 controls a search for a peripheral access point by a scanning operation of a beacon signal or a discovery signal, a connection (association) to a wireless network (BSS) operated by the discovered access point, and the like. ..
- the wireless communication unit 502 When receiving a signal, the wireless communication unit 502 down-converts and digitally converts the RF signal received by the antenna 501 to generate an OFDM signal, and further performs processes such as demodulation and decoding to obtain the original bit sequence information. Reproduce.
- the wireless communication unit 502 has a role of passing the obtained bit sequence information to the signal processing unit 504.
- one wireless signal (one OFDM signal) in which a beacon signal and a discovery signal are assigned to different frequency channels arrives from the access point.
- the wireless communication unit 502 is performing a scan operation on one of the available frequency channels and may receive either a beacon signal or a discovery signal that arrives at the same time.
- the signal processing unit 504 processes signals transmitted and received via the wireless communication unit 502.
- the signal processing unit 504 includes a beacon signal processing unit 505 that processes a beacon signal received from an access point, a data processing unit 506 that processes a data signal for communication, and a discovery signal received from an access point. It includes a discovery signal processing unit 507 for processing the.
- the beacon signal includes information necessary for connection (association) to the wireless network (BSS) operated by the access point of the transmission source (described above).
- the beacon signal processing unit 505 notifies the control unit 503 of this type of information obtained by processing the beacon signal. Then, the control unit 503 instructs each unit to carry out the procedure for connecting to the access point, if necessary.
- the discovery signal includes information that can identify the channel used by the access point of the transmission source (described above).
- the discovery signal processing unit 507 processes the discovery signal and notifies the control unit 503 of information about the used channel specified. Then, the control unit 503 instructs each unit to perform the scanning operation on the used channel, as necessary.
- FIG. 6 schematically shows a functional configuration example in the wireless communication unit 502.
- the wireless communication unit 502 performs a wireless signal transmission/reception process on the frequency channel instructed by the control unit 503.
- FIG. 6 shows an example of the configuration mainly for receiving beacon signals and discovery signals and after digital processing.
- the automatic gain control processing unit 601 controls the gain of the received OFDM signal.
- the guard interval removing unit 602 removes the guard interval from the OFDM symbol.
- the FFT unit 603 performs a Fourier transform
- the subcarrier demodulation unit 604 demodulates each subcarrier
- the deinterleaver 605 and the decoding unit 606 perform deinterleaving and decoding processing to decode the original beacon signal or discovery signal.
- Fig. 7 illustrates an example of the scanning method.
- an access point determines an operation channel called a use channel and transmits a beacon signal and a preamble signal accompanying data by using the use channel.
- FIG. 8 illustrates another scanning method.
- the access point (AP) transmits a discovery signal different from the beacon signal while periodically frequency hopping at a cycle shorter than the beacon interval.
- the discovery signal stores information that can specify the channel used by the access point, for example. Therefore, the communication terminal (STA) can discover the existence of the access point even in the state where only a certain fixed channel (which may be other than the used channel) is scanned.
- the access point transmits a discovery signal at 20 millisecond intervals, it is possible to reduce the scan time, which was 1,600 milliseconds at maximum in the example shown in FIG. 7, to 320 milliseconds at maximum.
- the communication terminal also switches the scan channel at the same time, the probability that the access point can be found in an earlier time becomes higher.
- the communication device 200 that operates as an access point must be equipped with a wireless communication unit that transmits a discovery signal, in addition to the wireless communication unit 202 that performs communication (transmission of beacon signals and data communication) using a used channel. It doesn't happen. Further, the number of wireless communication units is required according to the number of channels to which the discovery signal is desired to be transmitted at the same time, which may be a great limitation in mounting the device.
- the beacon signal and the discovery signal are transmitted as one wireless signal (OFDM signal) using only a single wireless communication unit 202, thereby reducing the efficiency of data communication. Instead, we propose below a method to reduce the scan time.
- the communication device 200 operating as an access point generates an OFDM signal in which a discovery signal is allocated to a plurality of channels other than the used channel when the transmission power has a margin, thereby generating a single beacon signal.
- the discovery signal can be transmitted on a plurality of channels, and the scan time can be further shortened.
- the channel of the discovery signal is switched in one OFDM signal, thereby scanning the communication terminal without depending on the device constraint. It is possible to shorten the time.
- FIG. 9 shows an example of a communication sequence performed in the communication system.
- STA1 is already connected to the BSS operated by the AP, but STA2 is not yet connected to the AP. It is assumed that a scan is in progress (see FIG. 1), and the access point transmits a beacon signal and a discovery signal as one OFDM signal.
- the AP determines the number of channels to which the discovery signal is assigned based on its own transmission power information (SEQ901). The details of the processing procedure by which the access point determines the number of channels to which the discovery signal is assigned will be described later.
- the AP After that, the AP generates a beacon signal and a discovery signal as one OFDM signal (SEQ902), and simultaneously transmits the beacon signal and the discovery signal (SEQ903). Details of the frame format of the discovery signal will be given later.
- STA1 is already connected to the AP, and can acquire the necessary information by acquiring only the beacon signal assigned to the used channel.
- the STA2 when the STA2 is in the process of scanning and can acquire the discovery signal in the channel on which it waits (SEQ921), the STA2 starts the scan in the channel used by the AP based on the information included in the discovery signal. (SEQ922), the AP waits for a beacon signal to be transmitted next from the AP.
- the STA2 can receive the beacon signal (SEQ923). That is, when the STA 2 waits on any of the channels and discovers the discovery signal, it can wait for the beacon signal to be transmitted next on the channel used by the AP, so that the scan time can be shortened.
- STA2 can acquire the information necessary for connection (Association) to the wireless network (BSS) operated by the AP, from the beacon signal received from the AP. Further, although not shown in FIG. 9, the STA 2 can transmit a probe request to the AP and receive a probe response from the AP using the used channel, if necessary.
- BSS wireless network
- FIG. 10 shows an example of the frame format of the discovery signal.
- This figure is a frame that refers to the frame format defined by IEEE 802.11, and includes a preamble (Preamble), a MAC (Media Access Control) header, and a frame body (Frame Body).
- Preamble Preamble
- MAC Media Access Control
- Frame Body a frame body
- the preamble includes a short training sequence (Short Training Sequence: STF) used for synchronization acquisition, a long training sequence (Long Training Sequence: LTF) used for accurate synchronization acquisition and channel estimation, and information such as PHY layer parameters.
- STF Short Training Sequence
- LTF Long Training Sequence
- PHY layer parameters information such as PHY layer parameters.
- the SIG field includes a field for storing Length information indicating the transmission length of the discovery signal and Length information indicating the transmission length of the beacon signal. Therefore, the communication terminal acquires the information of the transmission length of the discovery signal and the beacon signal, and after receiving the discovery signal on the channel on which the communication terminal waits, the beacon signal is transmitted on the channel used by the corresponding access point. You can know what will be done.
- any length information is not particularly limited in description format as long as it is information indicating how long each signal is transmitted.
- the length of the discovery signal or the beacon signal in units of time (seconds) or bits. May be described.
- the MAC header includes the source and destination MAC addresses of the discovery signal, Duration Length indicating the duration of the frame, and the like. However, since the MAC header basically has a structure according to the frame format defined by IEEE 802.11, detailed description thereof will be omitted here.
- “Frame Body” is a field in which data information to be actually communicated in the frame is stored.
- the frame body of the discovery signal includes at least use channel information that can specify the use channel (of the access point) to which the beacon signal is transmitted. Therefore, the communication terminal receiving the discovery signal can appropriately switch to the channel used by the surrounding access points.
- the structure of other fields not explicitly shown in FIG. 10 is not particularly limited.
- all information including the beacon signal may be stored in the discovery signal.
- FCS Flash Check Sequence
- FIG. 11 shows another frame format example of the discovery signal.
- repetition number information indicating the number of times the discovery signal is repeatedly transmitted is added to the SIG field. The details of the procedure for repeatedly transmitting the discovery signal will be given later.
- the discovery signal shown in FIG. 11 further includes, in the Frame Body, Association information regarding the connection with the transmission source access point (ie, the association to the BSS operated by the access point). Association information shall include the Capability information of an access point etc., for example. Therefore, the communication terminal that has received the discovery signal can specify the channel used by the access point and can efficiently connect to the access point.
- FIG. 12 shows a processing procedure in the form of a flow chart when the access point determines the number of channels to which the discovery signal is allocated. It is assumed that the processing procedure shown in the figure is executed mainly by the control unit 203 in the communication device 200 operating as an access point.
- the access point determines the number of transmittable channels from its own Capability information and the channel information determined to be transmittable when the transmission right is acquired (step S1201).
- the access point obtains information on the required beacon transmission power value (step S1202), and calculates the value "A” by rounding down the ratio to the maximum transmission power value that it can output (step S1203).
- the access point transmits a discovery signal on all channels other than the used channel (step S1205), and the present process To finish.
- the access point transmits the discovery signal on any (A-1) channel other than the used channels.
- Step S1206 the present process ends. In this case, a null signal is placed in the channel in which neither the beacon signal nor the discovery signal is placed.
- the access point can generate an OFDM signal to which a discovery signal is assigned on all seven channels other than the used channel. This is because the transmission power value assigned to the beacon signal exceeds the required beacon transmission power of 15 dBm/ch even if the OFDM signal of all 8 channels is generated with the transmission power of 23 dBm.
- the access point selects any one channel other than the used channel and allocates the discovery signal, and generates the OFDM signal in which the null signal is allocated to the six channels other than the channel to which the used channel and the discovery signal are allocated. This is because when the OFDM signal of all 8 channels is generated with the transmission power of 23 dBm, the transmission power value assigned to the beacon signal is less than the required beacon transmission power of 20 dBm/ch. In order not to fall below the required beacon transmission power value, only one channel other than the used channel must be selected and assigned as a discovery signal.
- the method of setting the required beacon transmission power mentioned here is not particularly limited. For example, it is necessary to obtain the service area information of the access point itself by calculating from the positional relationship of other access points or receiving notification from an external database, and to cover its own service area.
- the transmission power value may be obtained.
- the required beacon transmission power may be notified directly from an external database.
- the user may directly specify what percentage of the maximum transmission power value is allowed.
- FIG. 13 shows a processing procedure in the form of a flow chart when the access point generates an OFDM signal in which a beacon signal and a discovery signal are arranged in different channels. It is assumed that the processing procedure shown in the figure is executed mainly by the control unit 203 in the communication device 200 operating as an access point. Further, it is assumed that this processing procedure is performed after the access point determines the number of channels to which the discovery signal is assigned according to the processing procedure shown in FIG.
- the access point allocates the beacon signal to the used channel and generates an OFDM signal in which the discovery signal is allocated to all other channels. (Step S1305), the present process ends.
- step S1301 if it is determined that the discovery signal has been assigned to some of the channels other than the used channel (No in step S1301), can the access point repeatedly transmit the discovery signal while transmitting the beacon signal? It is determined whether or not (step S1302). For example, it is determined whether the transmission time of the beacon signal is sufficiently long and the transmission time of the beacon signal is not exceeded even if the discovery signal is transmitted multiple times.
- the access point When it is determined that the discovery signal can be repeatedly transmitted (Yes in step S1302), the access point generates an OFDM signal in which the channel position of the discovery signal is switched in time units in one OFDM signal (step S1302). (S1303), this process ends.
- the access point When it is determined that the discovery signal cannot be repeatedly transmitted (No in step S1302), the access point generates an OFDM signal in which the discovery signal is assigned to the fixed channel selected from the channels other than the used channel ( (Step S1304), this processing ends.
- FIG. 14 shows a processing procedure in the form of a flow chart when the communication terminal receives an OFDM signal. It is assumed that the processing procedure shown in the figure is executed mainly by the control unit 503 in the communication device 500 that operates as a communication terminal.
- the communication terminal may receive the OFDM signal in which the access point arranges the beacon signal and the discovery signal in different channels according to the processing procedure shown in FIG. 13.
- the communication terminal When the communication terminal receives a signal on the waiting channel (step S1401), it checks whether it is possible to connect to the transmission source of the signal (step S1402). Specifically, the communication terminal determines whether the source of the signal is an access point, and if it is the access point, whether it matches the SSID (Service Set IDentifier) that the communication terminal wants to connect to. Is checked based on the received signal.
- SSID Service Set IDentifier
- step S1403 if the communication terminal determines that it is possible to connect to the transmission source (Yes in step S1402), it then checks whether or not the signal received in step S1401 is a beacon signal (step S1403).
- the channel on which the communication terminal waits is the channel used by the access point of the transmission source. Therefore, the communication terminal acquires the information necessary for connection (Association) from the received beacon signal, uses the channel used, applies the connection to the access point (step S1404), and executes this processing. finish.
- step S1401 If the signal received in step S1401 is not a beacon signal (No in step S1403), the communication terminal further checks whether the signal received in step S1401 is a discovery signal (step S1405).
- the communication terminal When the discovery signal has been received (Yes in step S1405), the communication terminal identifies the channel used by the access point of the transmission source based on the information described in the discovery signal, and waits for the channel. To the used channel and the scanning operation is continued (step S1406). This allows the communication terminal to wait for a signal on the channel on which the source access point is expected to transmit a beacon signal.
- the received discovery signal includes sufficient information about the channel used by the access point and Association information necessary for connecting to the access point (such as Capability information of the access point), in step S1406, It is also possible to switch to the channel used by the access point, skip the scanning operation, and immediately apply for connection to the access point.
- step S1402 when it is determined that it is not possible to connect to the transmission source (No in step S1402) or when neither the beacon signal nor the discovery signal is received (No in step S1405), the communication terminal determines the current standby channel. Then, the scanning operation is continued (step S1407).
- Is shown. 16 shows the relationship between time and frequency in the signal allocation example shown in FIG.
- the access point allocates a beacon signal to the used channel and a discovery signal to the other three transmittable channels. Even with such signal allocation, the transmission power of each channel exceeds the required beacon transmission power.
- the access point can transmit the discovery signal using multiple channels at one time.
- the communication terminal being scanned (for example, STA2 in FIG. 1) acquires the discovery signal. It is possible to significantly reduce the time required to do so.
- the access point allocates a beacon signal to a used channel, selects only one channel out of the other three transmittable channels and allocates a discovery signal, and the transmission power of each channel is An OFDM signal that can satisfy the required beacon transmission power is generated. Further, according to the generation processing of the OFDM signal shown in FIG. 13, it is determined that the discovery signal can be repeatedly transmitted during the transmission of the beacon signal, and as shown in FIG. An OFDM signal in which the channel position is switched in time units is generated. A null signal is assigned to two channels other than the used channel and the channel to which the discovery signal is assigned.
- the communication terminal being scanned (for example, STA2 in FIG. 1) acquires the discovery signal. It is possible to significantly reduce the time required to do so.
- FIG. 19 shows an example of allocation of beacon signals and discovery signals (relationship between frequency and power).
- the access point can assign a beacon signal to a used channel and a discovery signal to a plurality of channels.
- the transmission time of the discovery signal is shorter than the transmission time of the beacon signal, radio resources other than the used channel from the end of transmission of the discovery signal to the end of transmission of the beacon signal are wasted. Will end up.
- the transmission time required for transmitting the beacon signal is shortened by widening the beacon signal from the middle using a channel other than the used channel. I will suggest a method.
- a beacon signal that is broadened and transmitted from the middle will be referred to as a divided beacon signal
- a beacon signal that is transmitted using only the used channel before being broadened will be referred to as a divided beacon signal 1 and the used channel
- the beacon signal that has been widened using channels other than the above will be referred to as a divided beacon signal 2.
- FIG. 20 shows an example of a communication sequence carried out in the communication system according to this embodiment.
- STA1 is already connected to the BSS operated by the AP, but STA2 is not yet connected to the AP. It is assumed that scanning is being performed (see FIG. 1), and the access point appropriately transmits a divided beacon signal.
- the AP exchanges Capability information with the STA1 being connected. Specifically, the AP requests the STA1 for the Capability information (SEQ2001), and the STA1 notifies the STA1 of its Capability information (SEQ2011). Then, the AP, based on the Capability information notified from the STA1, whether or not the STA1 can receive the divided beacon signal, or when acquiring the band information of the obtainable divided beacon signal, transmits the divided beacon signal. Or the band for transmitting the divided beacon signal is determined.
- the AP transmits the divided beacon signal. Specifically, the AP transmits the divided beacon signal 1 and the discovery signal as one OFDM signal (SEQ2002), and after the transmission of the discovery signal is completed, transmits the divided beacon signal 2 (SEQ2003).
- STA1 is already connected to the AP, and can acquire the necessary information by acquiring only the beacon signal assigned to the used channel.
- the STA2 when the STA2 is in the process of scanning and can acquire the discovery signal in the channel on which the STA2 is waiting (SEQ2021), the STA2 starts the scan in the channel used by the AP based on the information included in the discovery signal. (SEQ2022).
- the STA2 waits on the channel used by the AP, and thus can receive the beacon signal (SEQ2023).
- the STA 2 when the STA 2 waits on any channel and discovers the discovery signal, it can wait for the beacon signal to be transmitted next on the channel used by the AP, so that the scan time can be shortened.
- the STA1 also has an advantage that more information regarding the AP can be acquired from the divided beacon signal whose bandwidth has been widened midway.
- FIG. 21 shows a configuration example of the Capability information frame used when the communication terminal notifies the access point of the connection destination of the Capability information.
- the illustrated frame includes a flag indicating whether or not the communication terminal can receive each bandwidth of the divided beacon signal 2 whose bandwidth is widened.
- the communication terminal sets a flag corresponding to the receivable band and notifies the access point that the band can be received in the band (that is, the divided beacon signal 2 can be widened to the band).
- the bandwidth indicating whether or not reception is possible is 40 MHz, 80 MHz, and 160 MHz, but the Capability information may be exchanged for each bandwidth in which the divided beacon signal 2 can be transmitted.
- the access point treats all the flags as “false”, The beacon signal is not widened in any bandwidth to ensure the compatibility of the Legacy terminals.
- FIG. 22 shows an example of the frame format of the divided beacon signal 1.
- This figure is a frame that refers to the frame format defined by IEEE 802.11, which includes a preamble, a MAC header, and a frame body, and an error detection code FCS is added to the end of the frame.
- IEEE 802.11 which includes a preamble, a MAC header, and a frame body, and an error detection code FCS is added to the end of the frame.
- the preamble includes a short training sequence STF used for synchronization acquisition, a long training sequence LTF used for accurate synchronization acquisition and channel estimation, and each field of SIG storing information such as PHY layer parameters.
- the SIG field of the divided beacon signal 1 includes a divided beacon flag indicating that the beacon signal is a divided beacon signal, a Length information field indicating the transmission length of the divided beacon signal 1, and a divided beacon signal 2 having a wide band. It includes a band information field indicating a band to be used and a length information field indicating a transmission length of the divided beacon signal 2.
- the communication terminal determines whether or not the beacon signal is broadened thereafter based on the divided beacon flag, and sets the divided beacon signal 1_Length information. Based on this, it is possible to specify the timing when the band is expanded to the divided beacon signal 2. After that, the communication terminal can wait for the divided beacon signal 2 in the band indicated by the divided beacon signal 2_band information at the timing of widening the band.
- the divided beacon signal 2_Length information may be the length information of the entire divided beacon signal including the divided beacon signal 1 and the divided beacon signal 2.
- the MAC header basically has a structure that conforms to the frame format specified by IEEE 802.11, detailed description is omitted here. Further, although beacon information is stored in the frame body, detailed description thereof is omitted here.
- FIG. 23 shows a frame format example of the divided beacon signal 2.
- This figure is a frame that refers to the frame format defined by IEEE 802.11, which includes a preamble, a MAC header, and a frame body, and an error detection code FCS is added to the end of the frame.
- IEEE 802.11 which includes a preamble, a MAC header, and a frame body, and an error detection code FCS is added to the end of the frame.
- the preamble contains a short training sequence STF used for synchronization acquisition and a long training sequence LTF used for accurate synchronization acquisition and channel estimation. STF and LTF are transmitted in the band which widened. Note that, unlike the divided beacon signal 1, the preamble of the divided beacon signal 2 does not have a SIG field.
- the MAC header of the divided beacon signal 2 basically has a structure that conforms to the frame format specified by IEEE 802.11, detailed description is omitted here. Further, although beacon information is stored in the frame body, detailed description thereof is omitted here.
- FIG. 24 shows, in the form of a flowchart, a processing procedure for the access point to transmit the divided beacon signal in the present embodiment.
- the access point compares the transmission lengths of the discovery signal and the beacon signal (step S2401).
- the access point will transmit the beacon signal and the discovery signal by signal allocation as shown in FIG. 16 or FIG. 18, for example.
- the access point subsequently checks the Capability information of the communication terminal under the control of the divided beacon signal. Is received (step S2402).
- the access point When even one of the subordinate communication terminals cannot receive the divided beacon signal (No in step S2402), the access point gives up the transmission of the divided beacon signal and skips all the subsequent processing steps to complete the process. The process ends. In this case, the access point accepts the waste of radio resources and transmits the beacon signal and the discovery signal, for example, by the signal allocation shown in FIG.
- the access point when all the subordinate communication terminals can receive the divided beacon signal (Yes in step S2402), the access point generates an OFDM signal to which the divided beacon signal and the discovery signal are allocated (step S2403), The transmission of the OFDM signal is carried out.
- FIG. 25 shows the relationship between time and frequency in an example of beacon signal and discovery signal allocation in this embodiment.
- the OFDM signal to which the divided beacon signal and the discovery signal are allocated according to the signal allocation as shown in FIG. 25 is transmitted.
- the access point can assign the divided beacon signal 1 to the used channel and the discovery signal to multiple channels. After that, since the transmission time of the discovery signal is shorter than the transmission time of the beacon signal, after transmitting the discovery signal and then transmitting the beacon signal, the access point uses the channels other than the used channel Transmission of beacon signal 2 is started.
- step S2403 in the flowchart shown in FIG. 24 signal allocation as shown in FIG. 25 is performed within one OFDM signal.
- the access point widens the beacon signal from the middle after ending the transmission of the discovery signal using the divided beacon signal, thereby ensuring the shortening of the scanning time of the communication terminal and the beacon signal. It becomes possible to shorten the transmission time required for transmission.
- intervals may exist between the divided beacon signal 1 and the discovery signal and the divided beacon signal 2.
- an access point can efficiently transmit a scan signal, and such an access point can be realized with a simpler device configuration. be able to.
- a communication device operating as an access point can transmit a discovery signal and a beacon signal as one OFDM signal with one transmitter.
- the communication device operating as an access point When the communication device operating as an access point has a sufficient transmission power, it allocates a plurality of discovery signals to a channel other than the used channel and transmits the discovery signal (see FIG. 16) so that the scan time of the communication terminal is increased. Can be shortened.
- the channel of the discovery signal is switched in the OFDM signal (see FIG. 18), thereby shortening the scan time of the communication terminal. It becomes possible.
- the access point uses the band after the transmission of the short discovery signal to transmit the beacon signal in a wide band (see FIG. 25 ), thereby efficiently using radio resources without wasting radio resources. Beacon signals can be transmitted.
- the technology disclosed in this specification can be applied to, for example, a wireless LAN system conforming to the IEEE 802.11 standard, but can also be applied to various types of wireless networks utilizing multi-channels, and access point search time It is also possible to realize stabilization of data transmission by searching for and collision avoidance.
- a first signal processing unit that generates a first signal
- a second signal processing unit for generating a second signal including information about the first signal
- a communication unit that simultaneously transmits the first signal and the second signal
- a communication device comprising:
- the communication unit generates the first signal and the second signal as one radio signal, The communication device according to (1) above.
- the first signal processing unit generates the first signal to notify a subordinate communication terminal
- the second signal processing unit generates the second signal to notify the communication terminal before connection.
- the first signal processing unit generates a beacon signal as the first signal
- the second signal processing unit generates a discovery signal including information regarding transmission of the beacon signal as the second signal,
- the communication device according to (3) above.
- the second signal processing unit includes information about a channel used for transmitting the first signal, a transmission length of the second signal, a transmission length of the first signal, or the second signal. Generating the second signal including information of at least one of the number of repetitions of The communication device according to any one of (1) to (4) above.
- the second signal processing unit generates the second signal further including information regarding connection with the communication device, The communication device according to (5) above.
- the communication unit generates an OFDM signal in which the first signal and the second signal are arranged in different channels.
- the communication device according to any one of (1) to (5) above.
- Each of the first signal and the second signal is individually subcarrier-modulated, and each subcarrier is mapped on the frequency axis so that the first signal and the second signal are combined.
- the communication unit generates an OFDM signal in which the second signal is arranged in one or a plurality of channels,
- the communication device according to any one of (1) to (6) above.
- the communication unit generates the OFDM signal in which the second signals are arranged for the number of channels determined based on transmission power information.
- the communication device according to (7) above.
- the number of channels in which the second signal is arranged is determined based on the ratio between the maximum transmission power information of the communication unit and the transmission power information necessary for the first signal.
- the communication unit transmits the OFDM signal in which a null signal is arranged in a channel in which neither the first signal nor the second signal is arranged, or a time interval in the channel,
- the communication device according to any one of (7) to (9).
- the communication unit transmits the OFDM signal in which the second signal is repeatedly arranged while switching the channel position for each time in one OFDM signal.
- the communication device according to any one of (7) to (10).
- the communication unit may: Transmitting the OFDM signal in which the second signal is repeatedly arranged, The communication device according to (11) above.
- the communication unit transmits the OFDM signal in which a null signal is arranged in a channel in which neither the first signal nor the second signal is arranged or a time section in the channel,
- the communication device according to (11) above.
- the communication unit transmits one radio signal obtained by widening the band of the first signal after the transmission of the second signal is completed.
- the communication device according to any one of (1) to (4) above.
- the Capability information includes information on a band that the other communication device can receive by widening the band of the first signal, The communication device according to any one of (13) or (14).
- the Capability information is information indicating whether or not the other communication device can receive one radio signal in which the first signal has a wide band after the transmission of the second signal is completed. Including, The communication device according to any one of (13) or (14).
- the communication unit includes, in the first signal before the band is widened, information indicating that the band is broadened, a transmission length of the first signal before the band is widened (or the widened first signal).
- Wireless signal including at least one of (1) information regarding the time when the transmission of one signal is started),
- the communication device according to any one of (13) to (15).
- the communication unit includes at least one of information about a band used for band widening and a transmission length of the first signal after band widening in the first signal before band widening. Generate a radio signal, The communication device according to any one of (13) to (16).
- a communication unit that transmits and receives a radio signal on any of a plurality of frequency channels, A control unit that controls switching of channels that the communication unit should transmit and receive, A second processing unit that processes a second signal received from another communication device to obtain information about a channel used by the other communication device; A first processing unit that processes a first signal received from the other communication device to obtain information about the other communication device; Equipped with,
- the said communication part is a communication apparatus which makes the said 1st signal stand by in the said use channel specified based on the said 2nd signal.
- Control section 504... Signal processing section, 505 ... Beacon signal processing unit 506... Data processing unit, 507... Discovery signal processing unit 601... Automatic gain control processing unit, 602... Guard interval removal unit 603... FFT unit, 604... Subcarrier demodulation unit 605... Deinterleaver, 606... Decoding section
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Abstract
Description
第1の信号を生成する第1の信号処理部と、
前記第1の信号に関する情報を含む第2の信号を生成する第2の信号処理部と、
前記第1の信号と前記第2の信号を同時に送信する通信部と、
を具備する通信装置である。
前記第2の信号処理部は、接続前の通信端末へ通知するディスカバリ信号を前記第2の信号として生成する。
第1の信号を生成する第1の信号処理ステップと、
前記第1の信号に関する情報を含む第2の信号を生成する第2の信号処理ステップと、
前記第1の信号と前記第2の信号を同時に送信する通信ステップと、
を有する通信方法である。
複数の周波数チャネルのいずれかで無線信号を送受信する通信部と、
前記通信部が送受信すべきチャネルの切り替えを制御する制御部と、
他の通信装置から受信した第2の信号を処理して、前記他の通信装置の使用チャネルに関する情報を取得する第2の処理部と、
前記他の通信装置から受信した第1の信号を処理して、前記他の通信装置に関する情報を取得する第1の処理部と、
を具備し、
前記制御部は、前記第2の信号に基づいて特定される前記使用チャネルにおいて前記第1の信号の待ち受けを行わせる、通信装置である。
他の通信装置から受信した第2の信号を処理して、前記他の通信装置の使用チャネルに関する情報を取得するステップと、
前記第2の信号に基づいて特定される前記使用チャネルにおいて前記第1の信号の待ち受けを行うステップと、
前記他の通信装置から受信した第1の信号を処理して、前記他の通信装置に関する情報を取得するステップと、
を有する通信方法である。
前記第1の信号に関する情報を含む第2の信号を生成する第2の信号処理部と、
前記第1の信号と前記第2の信号を同時に送信する通信部と、
を具備する通信装置。
上記(1)に記載の通信装置。
前記第1の信号処理部は、配下の通信端末へ通知する前記第1の信号を生成し、
前記第2の信号処理部は、接続前の通信端末へ通知する前記第2の信号を生成する、
上記(1)又は(2)のいずれかに記載の通信装置。
前記第2の信号処理部は、前記第2の信号として前記ビーコン信号の送信に関する情報を含むディスカバリ信号を生成する、
上記(3)に記載の通信装置。
上記(1)乃至第(4)のいずれかに記載の通信装置。
上記(5)に記載の通信装置。
上記(1)乃至(5)のいずれかに記載の通信装置。
上記(6)に記載の通信装置。
上記(6)に記載の通信装置。
上記(1)乃至(6)のいずれかに記載の通信装置。
上記(7)に記載の通信装置。
上記(8)に記載の通信装置。
上記(7)乃至(9)のいずれかに記載の通信装置。
上記(7)乃至(10)のいずれかに記載の通信装置。
上記(11)に記載の通信装置。
上記(11)に記載の通信装置。
上記(1)乃至(4)のいずれかに記載の通信装置。
上記(13)に記載の通信装置。
上記(13)又は(14)のいずれかに記載の通信装置。
上記(13)又は(14)のいずれかに記載の通信装置。
上記(13)乃至(15)のいずれかに記載の通信装置。
上記(13)乃至(16)のいずれかに記載の通信装置。
前記第1の信号に関する情報を含む第2の信号を生成する第2の信号処理ステップと、
前記第1の信号と前記第2の信号を同時に送信する通信ステップと、
を有する通信方法。
前記通信部が送受信すべきチャネルの切り替えを制御する制御部と、
他の通信装置から受信した第2の信号を処理して、前記他の通信装置の使用チャネルに関する情報を取得する第2の処理部と、
前記他の通信装置から受信した第1の信号を処理して、前記他の通信装置に関する情報を取得する第1の処理部と、
を具備し、
前記制御部は、前記第2の信号に基づいて特定される前記使用チャネルにおいて前記第1の信号の待ち受けを行わせる、通信装置。
前記第2の信号に基づいて特定される前記使用チャネルにおいて前記第1の信号の待ち受けを行うステップと、
前記他の通信装置から受信した第1の信号を処理して、前記他の通信装置に関する情報を取得するステップと、
を有する通信方法。
203…制御部、204…信号処理部、205…ビーコン信号生成部
206…データ処理部、207…ディスカバリ信号生成部
301、311…符号化部、302、312…インターリーバ
303…サブキャリア変調部、304…IFFT部
305…ガードインターバル挿入部、306…シンボル整形部
401、411…符号化部、402、412…インターリーバ
403、413…サブキャリア変調部、404…チャネルマッピング部
405…IFFT部、406…ガードインターバル挿入部
407…シンボル整形部
500…通信装置、501…アンテナ、502…無線通信部
503…制御部、504…信号処理部、505…ビーコン信号処理部
506…データ処理部、507…ディスカバリ信号処理部
601…自動利得制御処理部、602…ガードインターバル除去部
603…FFT部、604…サブキャリア復調部
605…デインターリーバ、606…復号部
Claims (20)
- 第1の信号を生成する第1の信号処理部と、
前記第1の信号に関する情報を含む第2の信号を生成する第2の信号処理部と、
前記第1の信号と前記第2の信号を同時に送信する通信部と、
を具備する通信装置。 - 前記通信部は、前記第1の信号と前記第2の信号を1つの無線信号として生成する、
請求項1に記載の通信装置。 - 無線ネットワークにおけるアクセスポイントとして機能し、
前記第1の信号処理部は、配下の通信端末へ通知する前記第1の信号を生成し、
前記第2の信号処理部は、接続前の通信端末へ通知する前記第2の信号を生成する、
請求項1に記載の通信装置。 - 前記第1の信号処理部は、前記第1の信号としてビーコン信号を生成し、
前記第2の信号処理部は、前記第2の信号として前記ビーコン信号の送信に関する情報を含むディスカバリ信号を生成する、
請求項3に記載の通信装置。 - 前記第2の信号処理部は、前記第1の信号の送信に使用するチャネルに関する情報、前記第2の信号の送信長、前記第1の信号の送信長、又は前記第2の信号の繰り返し数のうち少なくとも1つの情報を含む前記第2の信号を生成する、
請求項1に記載の通信装置。 - 前記通信部は、前記第1の信号と前記第2の信号をそれぞれ異なるチャネルに配置したOFDM信号を生成する、
請求項1に記載の通信装置。 - 前記通信部は、1又は複数のチャネルに前記第2の信号を配置したOFDM信号を生成する、
請求項1に記載の通信装置。 - 前記通信部は、送信電力情報に基づいて決定されるチャネル数だけ前記第2の信号を配置した前記OFDM信号を生成する、
請求項7に記載の通信装置。 - 前記通信部の最大送信電力情報と、前記第1の信号に必要な送信電力情報との比率に基づいて前記第2の信号を配置するチャネル数を決定する、
請求項8に記載の通信装置。 - 前記通信部は、前記第1の信号と前記第2の信号のいずれも配置しないチャネル又はチャネル内の時間区間にヌル信号を配置した前記OFDM信号を送信する、
請求項7に記載の通信装置。 - 前記通信部は、1つのOFDM信号内で時間毎にチャネル位置を切り換えながら前記第2の信号を繰り返し配置した前記OFDM信号を送信する、
請求項7に記載の通信装置。 - 前記通信部は、前記第1の信号と前記第2の信号のいずれも配置しないチャネル又はチャネル内の時間区間にヌル信号を配置した前記OFDM信号を送信する、
請求項11に記載の通信装置。 - 前記通信部は、前記第2の信号の送信終了後に、前記第1の信号を広帯域化した1つの無線信号を送信する、
請求項1に記載の通信装置。 - 前記第1の信号の送信先となる他の通信装置のCapability情報に応じて、前記第2の信号の送信終了後に前記第1の信号を広帯域化した1つの無線信号を送信するか否かを決定する、
請求項13に記載の通信装置。 - 前記Capability情報は、前記他の通信装置が前記第1の信号を広帯域化して受信可能な帯域に関する情報を含む、
請求項13に記載の通信装置。 - 前記通信部は、広帯域化する前の前記第1の信号内に、広帯域化することを示す情報、広帯域化する前の前記第1の信号の送信長(若しくは、広帯域化した前記第1の信号の送信が開始される時間に関する情報)のうち少なくとも1つを含む無線信号を生成する、
請求項13に記載の通信装置。 - 前記通信部は、広帯域化する前の前記第1の信号内に、広帯域化に使用する帯域に関する情報、広帯域化した後の前記第1の信号の送信長のうち少なくとも1つを含む無線信号を生成する、
請求項13に記載の通信装置。 - 第1の信号を生成する第1の信号処理ステップと、
前記第1の信号に関する情報を含む第2の信号を生成する第2の信号処理ステップと、
前記第1の信号と前記第2の信号を同時に送信する通信ステップと、
を有する通信方法。 - 複数の周波数チャネルのいずれかで無線信号を送受信する通信部と、
前記通信部が送受信すべきチャネルの切り替えを制御する制御部と、
他の通信装置から受信した第2の信号を処理して、前記他の通信装置の使用チャネルに関する情報を取得する第2の処理部と、
前記他の通信装置から受信した第1の信号を処理して、前記他の通信装置に関する情報を取得する第1の処理部と、
を具備し、
前記制御部は、前記第2の信号に基づいて特定される前記使用チャネルにおいて前記第1の信号の待ち受けを行わせる、
通信装置。 - 他の通信装置から受信した第2の信号を処理して、前記他の通信装置の使用チャネルに関する情報を取得するステップと、
前記第2の信号に基づいて特定される前記使用チャネルにおいて前記第1の信号の待ち受けを行うステップと、
前記他の通信装置から受信した第1の信号を処理して、前記他の通信装置に関する情報を取得するステップと、
を有する通信方法。
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