WO2020195029A1 - 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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- WO2020195029A1 WO2020195029A1 PCT/JP2020/001026 JP2020001026W WO2020195029A1 WO 2020195029 A1 WO2020195029 A1 WO 2020195029A1 JP 2020001026 W JP2020001026 W JP 2020001026W WO 2020195029 A1 WO2020195029 A1 WO 2020195029A1
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- 238000004891 communication Methods 0.000 title claims abstract description 182
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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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.
- the transmission data is mapped to multiple frequency bands, power is distributed to each frequency band, and the modulation method / channel coding rate and transmission bandwidth are set.
- An object of the technique disclosed in the present specification is to provide a communication device and a communication method for performing data communication by bundling a plurality of bands.
- the first aspect of the techniques disclosed herein is: A communication unit that sends and receives wireless signals using multiple bands, A control unit that controls the communication operation in the communication unit, Equipped with The control unit controls to transmit the first signal in the first band between the acquisition of the transmission right in the first band and the acquisition of the transmission right in the second band. It is a communication device.
- the control unit controls so that the first signal includes information regarding acquisition of transmission rights in another band.
- control unit acquires the transmission right in both the first band and the second band
- control unit controls to perform data transmission using the first band and the second band at the same time.
- an RTS frame, a CTS frame, a data frame, a busy tone, etc. are transmitted.
- the second aspect of the technology disclosed herein is: A communication method in a communication device that transmits and receives wireless signals using multiple bands. Steps to acquire transmission rights in the first band, The step of transmitting the first signal in the first band and the step of transmitting the first signal in the first band until the transmission right is acquired in the second band. When the transmission right is acquired in both the first band and the second band, data transmission is performed using the first band and the second band at the same time. It is a communication method having.
- a communication unit that sends and receives wireless signals using multiple bands
- a control unit that controls the communication operation in the communication unit, Equipped with The control unit controls to receive the transmitted data using the first band and the second band at the same time after receiving the first signal in the first band. It is a communication device.
- a fourth aspect of the technique disclosed herein is a communication method in a communication device that transmits and receives wireless signals using a plurality of bands.
- a communication device that acquires a transmission right in another band while maintaining the transmission right in the band for which the transmission right was acquired first, and performs data communication by bundling a plurality of bands. And communication methods can be provided.
- FIG. 1 is a diagram showing a schematic configuration example of the communication system 100.
- FIG. 2 is a diagram showing a functional configuration example of the communication device 200.
- FIG. 3 is a diagram showing a communication sequence example (first embodiment) in the case where the base station and the slave unit communicate using the two channels of band A and band B.
- FIG. 4 is a diagram showing a format example of the RTS frame.
- FIG. 5 is a diagram showing a format example of the CTS frame.
- FIG. 6 is a flowchart (first embodiment) showing a processing procedure executed by the AP.
- FIG. 7 is a diagram showing a communication sequence example (second embodiment) in the case where the base station and the slave unit communicate using the two channels of band A and band B.
- FIG. 8 is a diagram showing a flowchart (second embodiment) showing a processing procedure executed by the AP.
- FIG. 9 is a diagram showing a communication sequence example (third embodiment) in the case where the base station and the slave unit communicate using the two channels of band A and band B.
- FIG. 10 is a diagram showing a flowchart (third embodiment) showing a processing procedure executed by the AP.
- FIG. 11 is a diagram showing a communication sequence example (fourth embodiment) in the case where the base station and the slave unit communicate using the two channels of band A and band B.
- FIG. 12 is a diagram showing a flowchart (fourth embodiment) showing a processing procedure executed by the AP.
- FIG. 13 is a diagram showing a communication sequence example (fifth embodiment) in the case where the base station and the slave unit communicate using the two channels of band A and band B.
- FIG. 14 is a diagram showing a flowchart (fifth embodiment) showing a processing procedure executed by the AP.
- FIG. 15 is a diagram showing a flowchart (sixth embodiment) showing a processing procedure executed by the STA.
- the other is that the waiting time from acquiring the transmission right in one band to acquiring the transmission right in another band is wasted.
- the signal to be transmitted in the band for which the transmission right has been acquired first may be a frame containing information that causes another terminal to wait for transmission, such as RTS (Request To Send) or CTS (Clear To Send), or like a busy tone. It may be a signal that another terminal waits for transmission by detecting power.
- FIG. 1 shows a schematic configuration example of a communication system 100 to which the technique proposed in the present specification is applied.
- the illustrated communication system 100 is composed of one base station (AP) 101 and one slave unit (STA) 102. Further, in the communication system 100, it is assumed that two channels, band A and band B, can be used. Bands A and B are, for example, 5 GHz band and 6 GHz band. Then, the slave unit 102 is connected to the base station 101, and communicates by bundling the channels in the band A and the channels in the band B.
- AP base station
- STA slave unit
- the number, positional relationship, and frequency of the communication devices shown in FIG. 1 are examples, and are not limited to the descriptions here. Further, a plurality of different channels in each of the bands A and B may be bundled for communication.
- FIG. 2 shows a functional configuration example of a communication device 200 capable of operating as either a base station or a slave unit in the communication system 100 according to the present embodiment.
- the illustrated communication device 200 includes a control unit 210, a power supply unit 220, a plurality of (three in the illustrated example) communication units 230-1, 230-2, 230-3, and each communication unit 230-1, ...
- the communication unit 230 is composed of a processor or a circuit such as a microprocessor, and is arranged in parallel with a wireless control unit 231, a data processing unit 232, a modulation / demodulation unit 233, a signal processing unit 234, and a channel estimation unit 235.
- a plurality of wireless interface (IF) units 236-1, ..., 236-N and amplifier units 237-1, ..., 237 connected in series to each wireless interface unit 236-1, ..., 236-N. -N is provided (however, N is an integer of 2 or more).
- each antenna element constituting the antenna unit 240 corresponding to the communication unit 230 is connected to each amplifier unit 237-1, ..., 237-N.
- each wireless interface unit 236-1, ..., 236-N may include the functions of the amplifier units 237-1, ..., 237-N corresponding to each.
- the data processing unit 232 When data is input from the upper layer of its own communication protocol, the data processing unit 232 generates a packet for wireless transmission from the data, and further for media access control (Media Access Control: MAC). Processing such as addition of a header and addition of an error detection code is performed, and the processed data is provided to the modulation / demodulation unit 233. Further, the data processing unit 232 performs MAC header analysis, packet error detection, packet reorder processing, etc. when receiving an input from the modulation / demodulation unit 233, and outputs the processed data to its own protocol upper layer. Provide to the layer.
- Media Access Control Media Access Control
- the wireless control unit 231 controls the transfer of information between each unit in the communication device 200. Further, the wireless control unit 231 performs parameter setting in the modulation / demodulation unit 233 and the signal processing unit 234, packet scheduling in the data processing unit 232, parameter setting in the wireless interface unit 236 and the amplifier unit 237, and transmission power control.
- the modulation / demodulation unit 233 performs coding, interleaving, and modulation processing on the input data from the data processing unit 232 based on the coding method and the modulation method set by the wireless control unit 231 to perform the data symbol stream. Is generated and provided to the signal processing unit 234. Further, the modulation / demodulation unit 233 performs demodulation processing, deinterleaving, and decoding processing opposite to those at the time of transmission on the input symbol stream from the signal processing unit 234 at the time of reception, and the data processing unit 232 or the wireless control unit. Data is provided to 231.
- the signal processing unit 234 performs signal processing for spatial separation on the input from the modulation / demodulation unit 233 as necessary, and transfers the obtained one or more transmission symbol streams to the respective wireless interface units 236-. Provided to 1. Further, at the time of reception, the signal processing unit 234 performs signal processing on the received symbol stream input from each wireless interface unit 236-1, ..., And spatially decomposes the stream as necessary to perform modulation / demodulation unit. Provided to 233.
- the channel estimation unit 235 calculates the complex channel gain information of the propagation path from the preamble portion and the training signal portion of the input signals from the respective radio interface units 236-1, ....
- the calculated complex channel gain information is used for demodulation processing in the modulation / demodulation unit 233 and spatial processing in the signal processing unit 234 via the radio control unit 231.
- the wireless interface unit 236 converts the input from the signal processing unit 234 into an analog signal, performs filtering, up-conversion to the carrier frequency, and phase control, and sends the input to the corresponding amplifier unit 237 or antenna unit 240. To do. Further, at the time of reception, the wireless interface unit 236 performs processing such as down-conversion, filtering, and conversion to a digital signal on the input from the corresponding amplifier unit 237 or the antenna unit 240, which is opposite to that at the time of transmission. Data is provided to the signal processing unit 234 and the channel estimation unit 235.
- the amplifier unit 237 At the time of transmission, the amplifier unit 237 amplifies the analog signal input from the wireless interface unit 236 to a predetermined power and sends it to the corresponding antenna element in the antenna unit 240. Further, at the time of reception, the amplifier unit 237 amplifies the signal input from the corresponding antenna element in the antenna unit 240 to a predetermined power with low noise, and outputs the signal to the wireless interface unit 236.
- At least one of the transmission function and the reception function of the amplifier unit 237 may be included in the wireless interface unit 236. Further, the amplifier unit 237 may have at least one of the transmission function and the reception function as a component other than the communication unit 230.
- a set of wireless interface unit 236 and amplifier unit 237 constitutes one RF (Radio Frequency) branch. It is assumed that one RF branch can transmit and receive one band.
- the communication unit 230 includes N RF branches.
- the control unit 210 is composed of a processor or a circuit such as a microprocessor, and controls the wireless control unit 231 and the power supply unit 220. Further, the control unit 210 may perform at least a part of the above-described operation of the radio control unit 231 instead of the radio control unit 231. In particular, in the present embodiment, the control unit 210 and the wireless control unit 231 control the operation of each unit in order to realize the operation according to each embodiment described later.
- the power supply unit 220 is composed of a battery power supply or a fixed power supply, and supplies power for driving to the communication device 200.
- the communication unit 230 may be configured to transition to a standby state or a sleep state (or a state in which at least some functions are stopped) to reduce power consumption.
- the communication unit 230 includes N RF branches, but may be configured so that each RF branch can transition to a standby state or a sleep state.
- control unit 210 and the communication unit 230 can be combined with one or a plurality of LSIs (Large Scale Integration).
- FIG. 3 shows an example of a communication sequence when a base station (AP) and a slave unit (STA) communicate using two channels of band A and band B. It is assumed that the STA is connected to the AP. Further, the AP and the STA may confirm in advance whether or not each other corresponds to the operation according to the present embodiment. Further, the AP and STA can acquire the transmission right according to the channel access method by, for example, CSMA / CA (Carrier Sense Multiple Access with Collection Access).
- CSMA / CA Carrier Sense Multiple Access with Collection Access
- AP acquires the transmission right in band B.
- the AP assumes that band A and band B are bundled to transmit data, but the backoff has not expired in band A. Therefore, in order to maintain the transmission right in band B (or so that other communication terminals do not acquire the transmission right) during the period until the transmission right is acquired in band A, the AP performs in band B.
- the RTS frame requesting transmission is transmitted.
- the STA receives the RTS frame from the AP in band B, and then returns the CTS frame that is permitted to be transmitted in band B as well.
- another communication terminal (not shown) using the band B sets the NAV (Network Allocation Vector) by receiving at least one frame of the RTS or the CTS, so that the transmission in the band B is performed. stand by.
- NAV Network Allocation Vector
- the RTS frame and CTS frame contain information regarding the acquisition of transmission rights in different bands (described later).
- the information regarding the acquisition of the transmission right in another band is, specifically, information indicating whether or not the transmission right is acquired in another band, information such as a band for which the transmission right has not been acquired yet. .. Specifically, information indicating that the AP is waiting for the acquisition of the transmission right in the band A is described in the RTS frame and the CTS frame.
- the STA can recognize from the received RTS frame that the AP is trying to bundle the band A and the band B and transmit the data to itself. For example, when the RF branch for band A is in the standby state or the sleep state, the STA also returns the RF branch for band A to the normal operating state, and the AP transmits data in which band A and band B are bundled. Be prepared.
- the AP can maintain the transmission right in band B. After that, when the AP also acquires the transmission right in the band A, the AP bundles the band A and the band B and starts transmitting the data to the STA. Then, on the STA side, it is possible to receive the data transmitted by bundling the band A and the band B.
- FIG. 4 shows an example of the format of the RTS frame used in the communication sequence shown in FIG.
- FIG. 5 shows an example of the format of the CTS frame used in the communication sequence shown in FIG.
- the Duration field indicated by reference numbers 402 and 502
- time information until the subsequent data communication is completed is described.
- Peripheral terminals that do not communicate read the value in this field and set the NAV. If the time for the AP to acquire the transmission right in band A is known, the Duration field describes the period until the data is transmitted and the ACK frame for the data is received. If the AP does not know the time to acquire the transmission right in band A, the Duration field contains the maximum value allowed.
- RA Receiveiver Address
- TA Transmitter Address
- CA Carrier Aggregation
- CA Indication field there is information indicating that the state is waiting for the acquisition of the transmission right in another band, or information indicating that there is a band for which the transmission right has not been acquired yet. be written.
- FCS Framework Check Sequence
- the AP or STA suspends the securing of the transmission right in the band B. May be good.
- FIG. 6 shows the processing procedure executed by the AP in the first embodiment in the form of a flowchart. This processing procedure is executed when the communication device 200 shown in FIG. 2 functions as an AP in the communication system 100 in which the two channels of band A and band B can be used.
- step S601 When the AP acquires the transmission right in band B (step S601), it checks whether or not the transmission right has not been acquired in band A yet (step S602).
- the AP can bundle the band A and the band B to transmit the data, and thus ends this process. ..
- step S602 if the AP has not yet acquired the transmission right in band A (Yes in step S602), the AP transmits an RTS frame in band B (step S603) and receives a CTS frame in band B. (Step S604) In the period until the transmission right is acquired in band A, the transmission right is maintained in band B as well.
- the AP when the AP acquires the transmission right even in the band A (step S605), the AP can bundle the band A and the band B to transmit the data, and thus ends this process.
- band A becomes busy during the RTS / CTS frame exchange in band B or after the frame exchange is completed, the AP secures the transmission right in band B. May be interrupted.
- the terminal since NAV is set not only for the peripheral terminals of the AP but also for the peripheral terminals of the STA, the terminal (hidden terminal) at a position where the signal from the transmitting side (AP) does not reach. ) Can also be made to wait for transmission.
- FIG. 7 shows an example of a communication sequence when the base station (AP) transmits a CTS frame to the slave unit (STA). It is assumed that the STA is connected to the AP. Further, the AP and the STA may confirm in advance whether or not each other corresponds to the operation according to the present embodiment. In addition, AP and STA can acquire transmission rights, for example, according to a channel access method by CSMA / CA.
- AP acquires the transmission right in band B.
- the AP assumes that band A and band B are bundled to transmit data, but the backoff has not expired in band A. Therefore, in order to maintain the transmission right in band B (or so that other communication terminals do not acquire the transmission right) during the period until the transmission right is acquired in band A, the AP performs in band B. Send a CTS frame.
- the CTS frame transmitted by the AP has a frame format as shown in FIG. 5, and has the MAC address of the AP whose source is RA, such as CTS-to-Self.
- CTS-to-self is a function specified in IEEE802.11g, and the AP dares to send CTS to itself so that communication can be performed to the STA connected to the AP. Notify.
- band B As a result, other terminals using band B set NAV according to the contents described in Duration in this CTS frame and wait for transmission in band B.
- the CTS frame transmitted by the AP contains information regarding the acquisition of transmission rights in another band (described above). Specifically, information indicating that the AP is waiting for the acquisition of the transmission right in the band A is described in the CTS frame. Therefore, the STA can recognize from the received CTS frame that the AP is trying to bundle the band A and the band B and transmit the data to itself. For example, when the RF branch for band A is in the standby state or the sleep state, the STA also returns the RF branch for band A to the normal operating state, and the AP transmits data in which band A and band B are bundled. Be prepared.
- the AP can maintain the transmission right in band B. After that, when the AP also acquires the transmission right in the band A, the AP bundles the band A and the band B and starts transmitting the data to the STA. Then, on the STA side, it is possible to receive the data transmitted by bundling the band A and the band B.
- AP or STA may suspend securing transmission rights in band B.
- FIG. 8 shows the processing procedure executed by the AP in the second embodiment in the form of a flowchart. This processing procedure is executed when the communication device 200 shown in FIG. 2 functions as an AP in the communication system 100 in which the two channels of band A and band B can be used.
- step S801 the AP checks whether the transmission right has not been acquired in the band A yet (step S802).
- the AP can transmit the data by bundling the band A and the band B, and thus ends this process. ..
- step S803 the AP transmits a CTS frame in band B (step S803) and acquires the transmission right in band A. During the period until, the transmission right is maintained even in band B.
- the AP when the AP acquires the transmission right even in the band A (step S804), the AP can bundle the band A and the band B to transmit the data, and thus ends this process.
- the AP secures the transmission right in the band B. You may interrupt it.
- the base station (AP) maintains the transmission right by transmitting a data frame instead of an RTS frame or a CTS frame in the band in which the transmission right has been acquired. An example of doing so will be described.
- FIG. 9 shows an example of a communication sequence when the base station (AP) transmits a data frame to the slave unit (STA). It is assumed that the STA is connected to the AP. Further, the AP and the STA may confirm in advance whether or not each other corresponds to the operation according to the present embodiment. In addition, AP and STA can acquire transmission rights, for example, according to a channel access method by CSMA / CA.
- AP acquires the transmission right in band B.
- the AP assumes that band A and band B are bundled to transmit data, but the backoff has not expired in band A. Therefore, the AP transmits a data frame to the STA in band B.
- the AP maintains the transmission right in band B (or prevents other communication terminals from acquiring the transmission right) during the period until the transmission right is acquired in band A.
- the transmission period of the data frame may be determined based on the period from the acquisition of the transmission right in the band B to the acquisition of the transmission right in the band A.
- band B set NAV according to the contents described in Duration in the data frame transmitted from AP, and wait for transmission in band B.
- the AP can maintain the transmission right in the band B.
- the data frame transmitted by the AP contains information regarding the acquisition of transmission rights in another band (described above). Specifically, information indicating that the AP is waiting for the acquisition of the transmission right in the band A is described in the data frame. Therefore, the STA can recognize from the received data frame that the AP is trying to bundle the band A and the band B and transmit the data to itself. For example, when the RF branch for band A is in the standby state or sleep state, the STA also returns the RF branch for band A to the normal operating state, and the AP transmits data in which band A and band B are bundled. Be prepared.
- the AP when the AP also acquires the transmission right in band A, it interrupts the transmission of data in band B, bundles band A and band B, and starts transmitting data to STA. Then, on the STA side, it is possible to receive the data transmitted by bundling the band A and the band B.
- the AP may suspend the data transmission in the band B immediately after acquiring the transmission right in the band A, or may transmit the data only in the band B until a certain period in which the STA can decode the data in the middle. After that, the data transmission may be switched to the carrier aggregation in which the bands A and B are bundled.
- the fixed period referred to here is, for example, a terminal of an A-MPDU subframe in A-MPDU (Aggregate MAC Protocol Data Unit) or a block unit of an LDPC (Low Density Parity Check) code.
- band A becomes busy while transmitting a data frame in band B or after completing transmission of a data frame, AP or STA may suspend securing transmission rights in band B.
- FIG. 10 shows the processing procedure executed by the AP in the third embodiment in the form of a flowchart. This processing procedure is executed when the communication device 200 shown in FIG. 2 functions as an AP in the communication system 100 in which the two channels of band A and band B can be used.
- step S1001 the AP checks whether or not the transmission right has not been acquired in band A yet (step S1002).
- the AP can transmit the data by bundling the band A and the band B, and thus ends this process. ..
- step S1003 the AP transmits a data frame in band B (step S1003) and acquires the transmission right in band A. During the period until, the transmission right is maintained even in band B.
- step S1004 when the AP acquires the transmission right even in band A (step S1004), the AP ends this process.
- the AP when the AP also acquires the transmission right in band A, it interrupts the transmission of data in band B and starts transmitting data to STA by carrier aggregation that bundles band A and band B.
- band A becomes busy during the transmission of a data frame in band B or after the transmission of the data frame is completed, the AP secures the transmission right in band B. You may interrupt it.
- the AP can perform data transmission by using the time until the transmission right is acquired in all the bands used for carrier aggregation without waste.
- the base station (AP) maintains the transmission right by transmitting the busy tone in the band in which the transmission right has been acquired.
- FIG. 11 shows an example of a communication sequence when the base station (AP) transmits a busy tone to the slave unit (STA). It is assumed that the STA is connected to the AP. Further, the AP and the STA may confirm in advance whether or not each other corresponds to the operation according to the present embodiment. In addition, AP and STA can acquire transmission rights, for example, according to a channel access method by CSMA / CA.
- AP acquires the transmission right in band B.
- the AP assumes that band A and band B are bundled to transmit data, but the backoff has not expired in band A. Therefore, the AP transmits a busy tone in band B.
- the AP maintains the transmission right in band B (or prevents other communication terminals from acquiring the transmission right) during the period until the transmission right is acquired in band A.
- the busy tone transmission period may be determined based on the period from the acquisition of the transmission right in the band B to the acquisition of the transmission right in the band A.
- band B When another terminal using band B detects a busy tone transmitted from the AP during the backoff period, it waits for transmission in band B. In this way, the AP can maintain the transmission right in band B by preventing other communication terminals from acquiring the transmission right.
- the busy tone transmitted by the AP contains information regarding the acquisition of transmission rights in another band (described above). Specifically, information indicating that the AP is waiting for the acquisition of the transmission right in the band A is described in the busy tone (for example, a preamble signal). Therefore, the STA can recognize from the received busy tone that the AP is trying to bundle the band A and the band B and transmit the data to itself. For example, when the RF branch for band A is in the standby state or the sleep state, the STA also returns the RF branch for band A to the normal operating state, and the AP transmits data in which band A and band B are bundled. Be prepared.
- the busy tone for example, a preamble signal
- the AP when the AP also acquires the transmission right in band A, it interrupts the transmission of the busy tone in band B and starts transmitting data to STA by carrier aggregation that bundles band A and band B. Then, on the STA side, it is possible to receive the data transmitted by bundling the band A and the band B.
- the busy tone format used in this embodiment is arbitrary.
- the busy tone may include information about the time the AP transmits a data signal to allow a communication terminal according to the IEEE 802.11 standard to set the NAV. Further, the busy tone may include network identification information such as BSS (Basic Service Set) identification information so that a communication terminal according to the IEEE 802.11 standard can make a determination to stop receiving a signal.
- BSS Basic Service Set
- a signal pattern common to other systems for example, a cellular system
- interrupts from other systems can be prevented.
- the AP or STA may suspend the securing of the transmission right in the band B.
- FIG. 12 shows the processing procedure executed by the AP in the fourth embodiment in the form of a flowchart. This processing procedure is executed when the communication device 200 shown in FIG. 2 functions as an AP in the communication system 100 in which the two channels of band A and band B can be used.
- step S1201 When the AP acquires the transmission right in the band B (step S1201), the AP checks whether or not the transmission right has not been acquired in the band A (step S1202).
- the AP can bundle the band A and the band B to transmit the data, and thus ends this process. ..
- step S1203 the AP transmits a busy tone in band B (step S1203) until the transmission right in band A is acquired.
- the transmission right in the band B is maintained by preventing other terminals from acquiring the transmission right in the band B.
- step S1204 when the AP acquires the transmission right even in band A (step S1204), the AP ends this process.
- the AP when the AP also acquires the transmission right in band A, it interrupts the transmission of the busy tone in band B and starts transmitting data to STA by carrier aggregation that bundles band A and band B.
- the AP interrupts the securing of the transmission right in the band B. You may.
- the AP can prevent interruption of other communications even if the time required to acquire the transmission right in all the bands used for carrier aggregation is short. Further, the transmission of the terminal of another wireless communication system that cannot decode the frame according to the IEEE802.11 standard can be made to stand by by the power detection of the busy tone.
- the base station (AP) transmits according to the time from the acquisition of the transmission right in a certain band to the acquisition of the transmission right in another band.
- An example of maintaining the transmission right in the band acquired first by changing the signal to be output will be described.
- FIG. 13 shows an example of a communication sequence when the base station (AP) transmits a signal according to time to the slave unit (STA). It is assumed that the STA is connected to the AP. Further, the AP and the STA may confirm in advance whether or not each other corresponds to the operation according to the present embodiment. In addition, AP and STA can acquire transmission rights, for example, according to a channel access method by CSMA / CA.
- AP acquires the transmission right in band B.
- the AP assumes that band A and band B are bundled to transmit data, but the backoff has not expired in band A. Therefore, the AP transmits a frame to the STA in the band B. As a result, the AP maintains the transmission right in band B (or prevents other communication terminals from acquiring the transmission right) during the period until the transmission right is acquired in band A.
- the AP changes the frame to be transmitted according to the first time until the transmission right is acquired in the band A.
- the AP transmits a data frame in band B to perform the same operation as in the third embodiment.
- the AP transmits the RTS frame in the band B to perform the first time. The same operation as in the case of the above embodiment is performed.
- the AP transmits a CTS frame in band B to perform the same operation as in the second embodiment.
- the AP transmits a busy tone in band B to perform the same operation as in the fourth embodiment. carry out.
- the AP maintains the transmission right in the band B during the period until the transmission right in the band A is acquired by transmitting the signal according to the length of the first time in the band B. (Or prevent other communication terminals from acquiring transmission rights).
- band B When the AP transmits one of a data frame, an RTS frame, or a CTS frame, other terminals using band B follow the contents described in Duration in the frame transmitted from the AP. Set NAV and wait for transmission in band B. By setting the NAV by another communication terminal, the AP can maintain the transmission right in the band B.
- the AP when the AP transmits a busy tone, another terminal using the band B waits for the transmission in the band B when the busy tone transmitted from the AP is detected during the backoff period. In this way, the AP can maintain the transmission right in band B by preventing other communication terminals from acquiring the transmission right.
- the AP when the AP also acquires the transmission right in band A, it interrupts the transmission of the busy tone in band B and starts transmitting data to STA by carrier aggregation that bundles band A and band B.
- FIG. 14 shows the processing procedure executed by the AP in the fifth embodiment in the form of a flowchart. This processing procedure is executed when the communication device 200 shown in FIG. 2 functions as an AP in the communication system 100 in which the two channels of band A and band B can be used.
- step S1401 When the AP acquires the transmission right in band B (step S1401), it checks whether or not the transmission right has not been acquired in band A yet (step S1402).
- the AP can bundle the band A and the band B to transmit the data, and thus ends this process. ..
- step S1402 the AP checks the length of the first time until the transmission right is acquired in band A.
- the AP transmits a data frame in band B as in the case of the third embodiment (step S1408).
- the AP transmits an RTS frame to the STA in band B (step S1409), and then receives a CTS frame from the STA (step S1410), as in the first embodiment. ..
- the first time is less than the time required to perform the RTS / CTS frame exchange between the AP and STA (Yes in step S1404), but more than the time required to transmit the CTS frame. If there is (No in step S1405), the AP transmits a CTS frame addressed to itself in band B as in the second embodiment (step S1411).
- the AP transmits a busy tone in band B, as in the fourth embodiment. (Step S1406).
- step S1407 when the AP acquires the transmission right in the band A while transmitting the signal corresponding to the length of the first time until the transmission right is acquired in the band A (step S1407), this process is performed. finish.
- the AP when it also acquires the transmission right in band A, it starts transmitting data to STA by carrier aggregation that bundles band A and band B.
- the AP has transmitted a data frame (step S1408), the transmission of data in band B is interrupted, and carrier aggregation using band A and band B is performed.
- the AP is transmitting the busy tone (step AS1406), the transmission of the busy tone in the band B is interrupted, and carrier aggregation using the bands A and B is performed.
- the AP can select the optimum processing without wasting the time until the transmission right is acquired in all the bands used for carrier aggregation.
- the slave unit (STA) receives a data frame transmitted from the base station (AP)
- the AP shall transmit the data frame by any of the methods of the first to fifth embodiments described above.
- FIG. 15 shows the processing procedure executed by the STA in the sixth embodiment in the form of a flowchart. This processing procedure is executed when the communication device 200 shown in FIG. 2 functions as a STA in the communication system 100 in which two channels of band A and band B can be used.
- step S1501 when the STA detects a signal in band B while waiting for reception in band B (step S1501), the STA checks whether the signal is addressed to itself (step S1502).
- the STA sets the NAV based on information such as Duration described in the signal (step S1507). , All subsequent processes are skipped and this process ends.
- the STA receives and processes the signal (step S1503). For example, when the received signal is an RTS frame transmitted from the AP, the STA performs a process of returning the CTS frame. If the received signal is a data frame transmitted from the AP, the STA executes the reception processing of the data frame.
- the STA checks whether or not the received signal includes CA Indicator (or information indicating whether or not the transmission right is being acquired in band A) (step S1504).
- the STA ends the main process as it is when the process of the received signal is completed.
- step S1504 STA prepares for carrier aggregation using bands A and B (step S1505). For example, when the STA puts the RF branch for band A in the standby state or the sleep state while waiting for reception in band B, the STA returns the RF branch for band A to the normal operating state. Prepare for the start of carrier aggregation using bands A and B.
- the STA performs a process of receiving data transmitted by carrier aggregation in which the AP bundles band A and band B (step S1506).
- a communication device when a communication device transmits data using a plurality of bands, it is interrupted by another terminal even if the timing of acquiring the transmission right differs for each band. It is possible to transmit without wasting time until the transmission right is acquired in all bands.
- the technology disclosed in this specification is applied to, for example, an IEEE802.11 system wireless LAN system, and realizes data communication by efficiently bundling a plurality of bands and widening the bandwidth while following the channel access method by CSMA / CA. can do.
- the technique disclosed in the present specification can be suitably applied to wireless LAN systems other than the IEEE 802.11 system.
- the present specification has mainly described an example in which carrier aggregation is performed during downlink communication from an access point to a subordinate slave unit
- the gist of the technology disclosed in the present specification is limited to this. It's not a thing.
- the technology disclosed in this specification is similarly applied to the case where carrier aggregation is performed during uplink communication from the slave unit to the connection destination access point, and the case where carrier aggregation is performed during side link communication between terminals. be able to.
- the technology disclosed in this specification can also have the following configuration.
- a communication unit that transmits and receives wireless signals using multiple bands
- a control unit that controls the communication operation in the communication unit, Equipped with The control unit controls to transmit the first signal in the first band between the acquisition of the transmission right in the first band and the acquisition of the transmission right in the second band.
- Communication device
- the control unit controls the first signal to include information regarding acquisition of transmission rights in another band.
- the communication device according to (1) above.
- the information regarding the acquisition of the transmission right in another band includes information indicating whether or not the transmission right is acquired in another band, or information in the band for which the transmission right has not yet been acquired.
- control unit acquires the transmission right in both the first band and the second band
- the control unit transmits data by using the first band and the second band at the same time.
- Control The communication device according to (1) above.
- the control unit controls to transmit an RTS frame requesting transmission as the first signal.
- the communication device according to any one of (1) to (4) above.
- control unit After receiving the CTS frame that allows transmission to the RTS frame in the first band, the control unit transmits data using the first band and the second band at the same time. Control to start, The communication device according to (5) above.
- control unit When the second band becomes busy during the exchange of the RTS frame and the CTS frame in the first band or after the frame exchange is completed, the control unit performs the first band. Control to suspend the securing of transmission rights in The communication device according to (5) above.
- the control unit controls to transmit a CTS frame that is permitted to be transmitted as the first signal.
- the communication device according to any one of (1) to (3) above.
- the control unit transmits a CTS-to-self frame as a first signal.
- the communication device according to (7) above.
- the control unit controls to transmit a data frame as a first signal.
- the communication device according to any one of (1) to (3) above.
- the control unit controls to interrupt the data transmission in the first band after acquiring the transmission right in the second band.
- the control unit controls to interrupt data transmission in the first band immediately after acquiring the transmission right in the second band.
- the communication device according to (9) above.
- control unit After acquiring the transmission right in the second band, the control unit transmits data only in the first band until a certain period in which the transmission destination terminal can decode the data on the way. Control to finish, The communication device according to (9) above.
- the fixed period is the end of a certain A-MPDU subframe in the A-MPDU, or a block unit of the LDPC code.
- the control unit controls to transmit a busy tone as a first signal.
- the communication device according to any one of (1) to (3) above.
- the busy tone includes information about the time when oneself transmits a data signal.
- the communication device according to (10) above.
- the busy tone includes network identification information.
- the communication device according to any one of (10) and (11) above.
- the busy tone includes a signal pattern common to other systems.
- the communication device according to any one of (10) to (12) above.
- the control unit transmits the first signal according to the time until the transmission right is acquired in the second band.
- the communication device according to any one of (1) to (3) above.
- control unit uses the control unit as the first signal.
- Control to send data frames The communication device according to (13) above.
- control unit uses the control unit as the first signal. Control to send RTS frames, The communication device according to (13) above.
- the time required to acquire the transmission right in the second band is less than the time required to exchange the RTS frame and the CTS frame, but longer than the time required to transmit the CTS frame.
- the control unit controls to transmit the CTS frame as the first signal.
- control unit causes the busy tone to be transmitted as the first signal.
- the communication device according to (13) above.
- a communication method in a communication device that transmits and receives wireless signals using a plurality of bands. Steps to acquire transmission rights in the first band, The step of transmitting the first signal in the first band and the step of transmitting the first signal in the first band until the transmission right is acquired in the second band. When the transmission right is acquired in both the first band and the second band, data transmission is performed using the first band and the second band at the same time. Communication method with.
- a communication unit that transmits and receives wireless signals using a plurality of bands, and A control unit that controls the communication operation in the communication unit, Equipped with The control unit controls to receive the transmitted data using the first band and the second band at the same time after receiving the first signal in the first band.
- a communication method in a communication device that transmits and receives wireless signals using a plurality of bands.
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Abstract
Description
複数の帯域を使用して無線信号の送受信を行う通信部と、
前記通信部における通信動作を制御する制御部と、
を具備し、
前記制御部は、第1の帯域で送信権を獲得してから第2の帯域で送信権を獲得するまでの間に、前記第1の帯域で第1の信号を送信するように制御する、
通信装置である。
複数の帯域を使用して無線信号の送受信を行う通信装置における通信方法であって、
第1の帯域で送信権を獲得するステップと、
第2の帯域で送信権を獲得するまでの間に、前記第1の帯域で第1の信号を送信するステップと、
前記第1の帯域及び前記第2の帯域でともに送信権を獲得したときに、前記第1の帯域及び前記第2の帯域を同時に用いてデータ送信を行うステップと、
を有する通信方法である。
複数の帯域を使用して無線信号の送受信を行う通信部と、
前記通信部における通信動作を制御する制御部と、
を具備し、
前記制御部は、前記第1の帯域で第1の信号を受信した後、前記第1の帯域及び第2の帯域を同時に用いて送信されたデータを受信するように制御する、
通信装置である。
第1の帯域で第1の信号を受信するステップと、
前記第1の帯域及び第2の帯域を同時に用いて送信されたデータを受信するステップと、
を有する通信方法である。
前記通信部における通信動作を制御する制御部と、
を具備し、
前記制御部は、第1の帯域で送信権を獲得してから第2の帯域で送信権を獲得するまでの間に、前記第1の帯域で第1の信号を送信するように制御する、
通信装置。
上記(1)に記載の通信装置。
上記(2)に記載の通信装置。
上記(1)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(5)に記載の通信装置。
上記(5)に記載の通信装置。
上記(1)乃至(3)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(1)乃至(3)のいずれかに記載の通信装置。
上記(8)に記載の通信装置。
上記(9)に記載の通信装置。
上記(9)に記載の通信装置。
上記(9-2)に記載の通信装置。
上記(1)乃至(3)のいずれかに記載の通信装置。
上記(10)に記載の通信装置。
上記(10)又は(11)のいずれかに記載の通信装置。
上記(10)乃至(12)のいずれかに記載の通信装置。
上記(1)乃至(3)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)に記載の通信装置。
上記(13)に記載の通信装置。
上記(13)に記載の通信装置。
第1の帯域で送信権を獲得するステップと、
第2の帯域で送信権を獲得するまでの間に、前記第1の帯域で第1の信号を送信するステップと、
前記第1の帯域及び前記第2の帯域でともに送信権を獲得したときに、前記第1の帯域及び前記第2の帯域を同時に用いてデータ送信を行うステップと、
を有する通信方法。
前記通信部における通信動作を制御する制御部と、
を具備し、
前記制御部は、前記第1の帯域で第1の信号を受信した後、前記第1の帯域及び第2の帯域を同時に用いて送信されたデータを受信するように制御する、
通信装置。
第1の帯域で第1の信号を受信するステップと、
前記第1の帯域及び第2の帯域を同時に用いて送信されたデータを受信するステップと、
を有する通信方法。
230…通信部、231…無線制御部、232…データ処理部
233…変復調部、234…信号処理部、235…チャネル推定部
236…無線インターフェース部、237…アンプ部
240…アンテナ部
Claims (20)
- 複数の帯域を使用して無線信号の送受信を行う通信部と、
前記通信部における通信動作を制御する制御部と、
を具備し、
前記制御部は、第1の帯域で送信権を獲得してから第2の帯域で送信権を獲得するまでの間に、前記第1の帯域で第1の信号を送信するように制御する、
通信装置。 - 前記制御部は、前記第1の信号に、別の帯域での送信権獲得に関する情報が含めるように制御する、
請求項1に記載の通信装置。 - 別の帯域での送信権獲得に関する情報は、別の帯域での送信権獲得を待っているか否かを示す情報、又は送信権をまだ獲得していない帯域の情報を含む、
請求項2に記載の通信装置。 - 前記制御部は、前記第1の帯域及び前記第2の帯域でともに送信権を獲得したときに、前記第1の帯域及び前記第2の帯域を同時に用いてデータ送信を行うように制御する、
請求項1に記載の通信装置。 - 前記制御部は、第1の信号として、送信を要求するRTSフレームを送信するように制御する、
請求項1に記載の通信装置。 - 前記第1の帯域でRTSフレームとCTSフレームの交換途中、又はフレーム交換を完了した後に前記第2の帯域がビジー状態となった場合には、前記制御部は、前記第1の帯域での送信権確保を中断するように制御する、
請求項5に記載の通信装置。 - 前記制御部は、第1の信号として、送信を許可するCTSフレームを送信するように制御する、
請求項1に記載の通信装置。 - 前記制御部は、第1の信号としてデータフレームを送信するように制御する、
請求項1に記載の通信装置。 - 前記制御部は、前記第2の帯域での送信権を獲得した後、前記第1の帯域でのデータ送信を中断するように制御する、
請求項8に記載の通信装置。 - 前記制御部は、第1の信号としてビジートーンを送信するように制御する、
請求項1に記載の通信装置。 - 前記ビジートーンは、自分がデータ信号を送信する時間に関する情報を含む、
請求項10に記載の通信装置。 - 前記ビジートーンは、ネットワーク識別情報を含む、
請求項10に記載の通信装置。 - 前記制御部は、前記第2の帯域で送信権を獲得するまでの時間に応じた前記第1の信号を送信する、
請求項1に記載の通信装置。 - 前記第2の帯域で送信権を獲得するまでの時間が、復号可能なデータの最小単位を送信するのに必要な時間以上の場合には、前記制御部は、第1の信号としてデータフレームを送信するように制御する、
請求項13に記載の通信装置。 - 前記第2の帯域で送信権を獲得するまでの時間が、RTSフレームとCTSフレームの交換を実施するのに必要な時間以上の場合には、前記制御部は、第1の信号としてRTSフレームを送信するように制御する、
請求項13に記載の通信装置。 - 前記第2の帯域で送信権を獲得するまでの時間が、RTSフレームとCTSフレームの交換を実施するのに必要な時間未満であるが、CTSフレームを送信するのに必要な時間以上の場合には、前記制御部は、第1の信号としてCTSフレームを送信するように制御する、
請求項13に記載の通信装置。 - 前記第2の帯域で送信権を獲得するまでの時間が、CTSフレームを送信するのに必要な時間未満の場合には、前記制御部は、第1の信号としてビジートーンを送信するように制御する、
請求項13に記載の通信装置。 - 複数の帯域を使用して無線信号の送受信を行う通信装置における通信方法であって、
第1の帯域で送信権を獲得するステップと、
第2の帯域で送信権を獲得するまでの間に、前記第1の帯域で第1の信号を送信するステップと、
前記第1の帯域及び前記第2の帯域でともに送信権を獲得したときに、前記第1の帯域及び前記第2の帯域を同時に用いてデータ送信を行うステップと、
を有する通信方法。 - 複数の帯域を使用して無線信号の送受信を行う通信部と、
前記通信部における通信動作を制御する制御部と、
を具備し、
前記制御部は、前記第1の帯域で第1の信号を受信した後、前記第1の帯域及び第2の帯域を同時に用いて送信されたデータを受信するように制御する、
通信装置。 - 複数の帯域を使用して無線信号の送受信を行う通信装置における通信方法であって、
第1の帯域で第1の信号を受信するステップと、
前記第1の帯域及び第2の帯域を同時に用いて送信されたデータを受信するステップと、
を有する通信方法。
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EP3934349A1 (en) | 2022-01-05 |
JP7497722B2 (ja) | 2024-06-11 |
US12028843B2 (en) | 2024-07-02 |
JP2024098123A (ja) | 2024-07-19 |
US20220124712A1 (en) | 2022-04-21 |
CN113615284A (zh) | 2021-11-05 |
EP3934349A4 (en) | 2022-05-25 |
KR20210142613A (ko) | 2021-11-25 |
US20240292394A1 (en) | 2024-08-29 |
JPWO2020195029A1 (ja) | 2020-10-01 |
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