WO2022239328A1 - 無線通信装置、無線通信端末、および無線通信方法 - Google Patents
無線通信装置、無線通信端末、および無線通信方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/04—Scheduled access
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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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present technology relates to a wireless communication device, a wireless communication terminal, and a wireless communication method, and in particular, a wireless communication device, a wireless communication terminal, and a wireless communication device capable of increasing opportunities for transmission and reception in communication over a plurality of links. Regarding communication methods.
- Multi-Link Operation is being considered as a method to meet high transmission speed requirements such as 8K transmission and xR (xReality).
- a “link” is a wireless transmission path that allows data transmission between two wireless communication devices.
- individual links are selected from among multiple independent wireless transmission paths that are divided, for example, in the frequency domain.
- MLD Multi-link Device
- MLD is a logical entity containing two or more STAs and has only one SAP (service access point) to the upper layer.
- SAP service access point
- An MLD whose STAs are APs is called an AP MLD
- an MLD whose STAs are non-AP STAs is called a non-AP MLD.
- MLD uses multiple links for transmission.
- due to factors such as the degree of frequency proximity between links there are cases where the transmission signal on one link leaks, causing strong interference with the reception signal on another link and degrading the communication quality.
- NSTR Nonsimultaneous transmit and receive
- STR Simultaneous transmit and receive
- AP MLD and non-AP MLD communicate using a certain link pair
- that link pair is STR link pair for AP MLD and NSTR link pair for non-AP MLD
- AP MLD defines STR AP MLD and non-AP MLD to be non-STR non-AP MLD.
- Non-Patent Document 1 defines non-STR non-AP MLD to wait for a certain period of time (MediumSyncDelay) after transmission on a certain link.
- Patent Document 1 describes a method in which a wireless station acquires information indicating the wireless communication status of surrounding wireless stations via a network and notifies the other wireless station of the information.
- Non-Patent Document 1 the non-STR non-AP MLD will wait for a long time due to transmission on the other link or MediumSyncDelay, and there is a risk that transmission and reception will not be possible.
- Patent Document 1 does not mention information such as the length of frames transmitted by wireless stations. Therefore, with the technique described in Patent Document 1, it is not possible to adjust the transmission time or waiting time between links, and it is difficult to reduce the waiting time of non-STR non-AP MLD.
- This technology has been developed in view of this situation, and is intended to increase the chances of transmission and reception in communication over multiple links.
- a wireless communication apparatus includes a wireless communication terminal, a communication unit that performs communication using a plurality of links, and a transmission of a first frame transmitted from the wireless communication terminal using a first link.
- a communication control unit configured to transmit to the wireless communication terminal, when a request frame is received, transmittable time specifying information specifying a transmittable time of the wireless communication terminal on the first link.
- a wireless communication terminal includes a wireless communication device, a communication unit that performs communication using a plurality of links, and transmission of a first frame transmitted to the wireless communication device using a first link In response to the request frame, the transmission time of the first frame on the first link specified in the transmission time specification information included in the response frame transmitted by the wireless communication device is matched. and a communication control unit configured to transmit the first frame to the wireless communication device over the first link.
- communication is performed with a wireless communication terminal using a plurality of links. Then, when receiving a transmission request frame of the first frame transmitted from the wireless communication terminal over the first link, a transmittable time designation for designating a transmittable time over the first link of the wireless communication terminal. Information is transmitted to the wireless communication terminal.
- communication is performed with a wireless communication device using a plurality of links. Then, in the transmittable time designation information included in the response frame transmitted by the wireless communication device in response to the transmission request frame of the first frame transmitted to the wireless communication device over the first link, The first frame is transmitted to the wireless communication device over the first link in accordance with the designated transmittable time of the first frame over the first link.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment of the present technology
- FIG. FIG. 10 is a diagram showing an example of a conventional sequence
- FIG. 10 is a diagram showing another example of a conventional sequence
- It is a diagram showing a configuration example of an MLO CTS frame according to an embodiment of the present technology. It is a figure which shows the example of the sequence of this technique.
- 1 is a block diagram showing a configuration example of a wireless communication device
- FIG. FIG. 10 is a flowchart for explaining processing of AP MLD
- FIG. FIG. 10 is a flowchart for explaining non-AP MLD processing
- FIG. It is a block diagram which shows the structural example of a computer.
- FIG. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present technology.
- data is transmitted and received by wireless communication (MLO) using multiple links.
- MLO wireless communication
- a "link” is a wireless transmission path that allows data transmission between two wireless communication devices.
- individual links are selected, for example, from among a plurality of mutually independent radio transmission paths divided in the frequency domain.
- Each link uses, for example, a channel selected from a plurality of channels included in one of frequency bands such as 2.4 GHz band, 5 GHz band, 6 GHz band, and 920 MHz band.
- MLD is a logical entity containing two or more STAs and has only one SAP to upper layers.
- the wireless communication system in Fig. 1 consists of one AP MLD1 and two non-AP MLD1 and non-AP MLD2.
- non-AP MLD1 and non-AP MLD2 are connected to AP MLD1.
- the solid line connecting AP MLD1 and non-AP MLD1 and non-AP MLD2 represents link1 (first link)
- the dashed line connecting AP MLD1 and non-AP MLD1 and non-AP MLD2 is Represents link2 (second link).
- AP MLD1 is a wireless communication device that operates as a base station that supports MLO.
- AP MLD1 contains AP1 and AP2.
- AP1 is a logical entity that operates with link1.
- AP2 is a logical entity that operates with link2.
- non-AP MLD1 and non-AP MLD2 are wireless communication devices that operate as MLO-compatible terminals.
- non-AP MLD1 includes non-AP STA1 and non-AP STA2.
- non-AP STA1 is a logical entity that operates with link1.
- non-AP STA2 is a logical entity that operates using link2.
- non-AP MLD2 includes non-AP STA3 and non-AP STA4.
- non-AP STA3 is a logical entity that operates with link1.
- non-AP STA4 is a logical entity that operates using link2.
- AP1 communicates with non-AP STA1 and non-AP STA3 using link1.
- AP2 communicates with non-AP STA2 and non-AP STA4 using link2.
- Link1 and link2 may be two channels selected from the same frequency band or two channels selected from different frequency bands.
- the number of links used between AP MLD1 and non-AP MLD1 and non-AP MLD2 is not limited to two, and communication may be performed using three or more links. Also, the number of non-AP MLDs is not limited to two, and three or more non-AP MLDs may be connected to AP MLD1.
- MLD uses multiple links for transmission.
- transmission signals on one link may leak, and interference with received signals on other links may be strong, degrading communication quality.
- NSTR link pair a link pair that causes restrictions on simultaneous transmission and reception between links
- STR link pair a link pair that does not have restrictions on simultaneous transmission and reception of signals between links, such as the fact that leakage power between links does not affect communication quality
- AP MLD refers to STR AP MLD
- non-AP MLD refers to non-STR non-AP MLD, even if there is no description of STR or non-STR.
- link1 and link2 are NSTR link pair, but link1 and link3 and link2 and link3 are Combinations of links such as STR link pair are also envisioned.
- the operations described herein apply to operations on link1 and link2.
- Non-Patent Document 1 defines that non-STR non-AP MLD waits for a certain period of time (MediumSyncDelay) after transmission on a certain link.
- Non-Patent Document 1 non-STR non-AP MLD may wait for a long time due to MediumSyncDelay and may not be able to perform transmission/reception.
- FIG. 2 is a diagram showing a sequence when the non-STR non-AP MLD waits with MediumSyncDelay.
- non-AP MLD1 and non-AP MLD2, which are non-STR non-AP MLDs, are connected to AP MLD1, and communication is performed using link1 and link2, respectively.
- non-AP STA2 acquires the transmission right for link2 and transmits an RTS (Request To Send) frame, which is a transmission request, to AP2.
- RTS Request To Send
- TXOP which is the time during which continuous transmission is possible with the transmission right of non-AP STA2, is from time t1 to time t12.
- AP2 Upon receiving the RTS frame transmitted from non-AP STA2, AP2 transmits a CTS (Clear To Send) frame as a response to the RTS frame to non-AP STA2 at time t2. As a result, non-AP STA2 starts transmitting the Data1 frame to AP2 at time t3.
- CTS Car To Send
- non-AP STA1 Due to the transmission of this Data1 frame, non-AP STA1 becomes Busy at time t3 and becomes unable to detect link1 media information.
- non-AP STA3 acquires the link1 transmission right and transmits an RTS frame to AP1.
- TXOP of non-AP STA3 is from time t4 to time t13.
- AP1 Upon receiving the RTS frame transmitted from non-AP STA3, AP1 transmits a CTS frame as a response to the RTS to non-AP STA3 at time t5. As a result, non-AP STA3 starts transmitting the Data3 frame to AP1 at time t6.
- non-AP STA2 finishes transmitting the Data1 frame at time t7, non-AP STA1 is no longer busy. After that, at time t8, AP2 transmits an ACK1 frame in response to the Data1 frame.
- non-AP STA1 starts standby operation by MediumSyncDelay timer at time t7.
- non-AP STA1 must wait until at least AP1 detects an ACK3 frame to be transmitted in response to a Data3 frame.
- FIG. 3 is a diagram showing a sequence when non-AP STA2 starts transmitting a Data2 frame while waiting for MediumSyncDelay in the case of FIG.
- the transmission right TXOP acquired at time t21 by non-AP STA2 is from time t21 to time t33.
- the transmission right TXOP acquired at time t24 by non-AP STA3 is from time t24 to time t34.
- non-AP STA2 finishes transmitting the Data1 frame, so non-AP STA1 is no longer in a busy state, but is still waiting due to the MediumSyncDelay timer.
- AP2 transmits an ACK1 frame in response to the Data1 frame at time t28.
- non-AP STA2 Since non-AP STA2, which received ACK1 from AP2, is within the TXOP of non-AP STA2, it starts transmitting Data2 frames to AP2 at time t29.
- non-AP STA1 Due to the transmission of this Data2 frame, non-AP STA1 becomes Busy at time t29 and becomes unable to detect link1 media information. That is, non-AP STA1 cannot detect the ACK3 frame transmitted at time t30 after the end of transmission of the Data3 frame.
- non-AP STA2 finishes transmitting the Data2 frame at time t31, non-AP STA1 ceases to be in the busy state. After that, at time t32, AP2 transmits an ACK2 frame in response to the Data2 frame.
- non-AP STA1 cannot detect the ACK3 frame, it must wait for a long time until TXOP of non-AP STA3 is completed at time t33 due to MediumSyncDelay.
- AP MLD1 cannot transmit data frames to non-AP MLD1 for a long period of time, and cannot perform DL MU (Downlink Multi User) transmission including non-AP MLD1 as the destination. Efficiency of use decreases.
- DL MU Downlink Multi User
- Embodiment> in communication over multiple links, when an RTS frame is received from a non-AP STA on link1, transmittable time designation information that designates a transmittable time is transmitted on link1 as a response. .
- MAC Medium Access Control
- PPDU PHY Protocol Data Unit
- PE Packet Extension
- FIG. 4 is a diagram showing a configuration example in the MAC layer of an MLO CTS frame including transmittable time specification information.
- the MLO CTS frame consists of Frame Control, Duration, RA (Receiving STA address), FCS (Frame Check Sequence), and Multi-link Extension fields.
- the MLO CTS frame in Fig. 4 is an extension frame in which an extension field for Multi-link Extension is added to the conventional CTS frame.
- Frame Control contains information indicating that this frame is a frame with a Control frame extension added.
- Duration contains information indicating the communication period covered by this frame.
- the RA contains information indicating the destination device.
- the RA may indicate, for example, a device-specific MAC address.
- FCS includes an error detection code.
- Multi-link Extension consists of Link ID, PPDU duration, and FCS subfields.
- Link ID contains information indicating the identifier of the link to be used.
- PPDU duration contains information indicating the transmission possible time. For example, "until the transmission end time of the non-AP STA in the non-STR non-AP MLD that is being transmitted on link2" is set as the information indicating the transmittable time. As long as the transmission end time is known, the information indicating the transmittable time may be set with the transmittable time or the transmission end time.
- FCS includes an error detection code.
- FIG. 5 is a diagram showing a sequence example in the present technology.
- non-AP MLD1 and non-AP MLD2, which are non-STR non-AP MLDs, are connected to AP MLD1.
- a case of communication using link2 is shown.
- AP MLD1 receives a data frame from non-AP STA2 in non-AP MLD1, which is non-STR non-AP MLD, on link2. - When receiving the RTS frame from AP STA3, it sends the MLO CTS frame described above with reference to Fig. 4 as a response.
- the data frame in the example of FIG. 5 may be a frame including at least one of data, management information, and control information.
- AP MLD1, non-AP MLD1, and non-AP MLD2 transmit/receive MLO CTS frames, and transmit Capability information including information indicating whether or not frame transmission time control operations are supported when connected. You can replace it.
- AP MLD1 may collect in advance information about the buffer size of subordinate non-AP MLD1 and non-AP MLD2, and the priority and type of data in the buffer.
- non-AP STA2 acquires the transmission right for link2 and transmits the RTS frame to AP2.
- TXOP by the transmission right of non-AP STA2 is from time T1 to time T13.
- AP2 Upon receiving the RTS frame transmitted from non-AP STA2, AP2 transmits a CTS frame, which is a response to the RTS frame, to non-AP STA2 at time T2. As a result, non-AP STA2 starts transmitting the Data1 frame to AP2 at time T3.
- the RDG (Reverse Direction Grant)/More (reverse direction approval/addition) PPDU subfield in the Data1 frame contains communication direction change availability information indicating whether or not to change the direction of communication.
- the non-AP STA2 may use the Reverse Direction Protocol in the RDG/More PPDU subfield in the Data1 frame, set the communication direction change enable/disable information to 1, and transmit the Data1 frame. . This allows AP2 to transmit the Data2 frame after transmitting the ACK frame for the Data1 frame.
- non-AP STA1 Due to the transmission of this Data1 frame, non-AP STA1 becomes Busy at time T3 and cannot detect media information of link1.
- non-AP STA3 acquires the link1 transmission right and transmits an RTS frame to AP1.
- TXOP by the transmission right of non-AP STA3 is from time T4 to time T14.
- AP1 which received the RTS frame sent from non-AP STA3, must specify the Data3 frame transmission time of non-AP STA3 based on the information in its own buffer and the information collected from subordinate non-AP STAs. It is determined whether or not.
- AP1 determines that it is necessary to specify the Data3 frame transmission time for non-AP STA3, at time T5, it transmits an MLO CTS frame containing transmittable time specification information describing the transmittable time for the Data3 frame.
- the transmittable time specification information specifies, for example, the reception end time of the Data1 frame.
- non-AP STA3 After receiving the MLO CTS frame, non-AP STA3 transmits the Data3 frame at time T6 in accordance with the time described in the MLO CTS frame.
- the non-AP STA3 may use the Reverse Direction Protocol to set the communication direction change permission information in the RDG/More PPDU subfield in the Data3 frame to 1 and transmit the Data3 frame. This allows AP1 to transmit the Data4 frame after transmitting the ACK3 frame for the Data3 frame.
- non-AP STA2 finishes transmitting the Data1 frame
- non-AP STA3 finishes transmitting the Data3 frame.
- non-AP STA1 releases the Busy state and starts standby operation with the MediumSyncDelay timer.
- AP1 transmits an ACK3 frame in response to the Data3 frame
- AP2 transmits an ACK1 frame in response to the Data1 frame.
- AP1 may set the RDG/More PPDU subfield in the ACK3 frame to 1 and transmit the ACK3 frame.
- AP2 may set the RDG/More PPDU subfield in the ACK1 frame to 1 and transmit the ACK1 frame.
- AP1 finishes sending the ACK3 frame
- AP2 finishes sending the ACK1 frame.
- the non-AP STA1 receives the ACK3 frame and cancels waiting for the MediumSyncDelay timer.
- AP1 starts transmitting Data4 frames addressed to non-AP STA1 and non-AP STA3 using DL MU
- AP2 starts transmitting Data2 frames addressed to non-AP STA2 using DL MU. Start sending.
- AP1 finishes sending the Data4 frame
- AP2 finishes sending the Data2 frame.
- non-AP STA1 and non-AP STA3 transmit ACK4 frames in response to Data4 frames
- non-AP ST2 transmits ACK2 frames in response to Data2 frames.
- transmission of the ACK4 frame ends and transmission of the ACK2 frame ends.
- FIG. 6 is a block diagram showing a configuration example of a wireless communication device to which the present technology is applied.
- the wireless communication device 11 shown in FIG. 6 is a wireless communication device that operates as an AP MLD or non-AP MLD.
- the wireless communication device 11 is composed of a communication section 31, a control section 32, a storage section 33, and antennas 41-1 and 41-2.
- Antennas 41-1 and 41-2 are collectively referred to as antenna 41 when there is no need to distinguish them.
- the communication unit 31 transmits and receives data.
- the communication unit 31 is configured to include amplifier units 51-1 and 51-2, radio interface units 52-1 and 52-2, and signal processing units 53-1 and 53-2. Also, the communication unit 31 is configured to include a data processing unit 54 , a communication control unit 55 , and a communication storage unit 56 .
- the amplifiers 51-1 and 51-2, the radio interface units 52-1 and 52-2, and the signal processors 53-1 and 53-2 are respectively the amplifier unit 51 and the radio interface units 53-1 and 53-2. These are collectively referred to as interface section 52 and signal processing section 53 .
- the amplifier unit 51 amplifies the analog signal supplied from the wireless interface unit 52 to a predetermined power during transmission, and outputs the analog signal with the amplified power to the antenna 41 .
- the amplifying unit 51 amplifies the analog signal supplied from the antenna 41 to a predetermined power during reception, and outputs the amplified analog signal to the radio interface unit 52 .
- a part of the function of the amplifier section 51 may be included in the wireless interface section 52 . Also, part of the functions of the amplification unit 51 may be a component outside the communication unit 31 .
- the radio interface unit 52 converts the transmission symbol stream from the signal processing unit 53 into an analog signal, performs filtering, up-conversion to a carrier frequency, and phase control, and transmits the phase-controlled analog signal to an amplifier unit. 51.
- the radio interface unit 52 performs phase control, down-conversion, and inverse filtering on the analog signal supplied from the amplifier unit 51, and converts the received symbol stream into a digital signal to the signal processing unit 53. Output.
- the signal processing unit 53 performs encoding, interleaving, modulation, etc. on the data unit supplied from the data processing unit 54, adds a physical header, and outputs the transmission symbol stream to each radio interface unit 52. do.
- the signal processing unit 53 analyzes the physical header of the received symbol stream supplied from each radio interface unit 52 at the time of reception, performs demodulation, deinterleaving, decoding, etc. on the received symbol stream, and generates data units.
- the generated data unit is output to the data processing section 54 .
- the data processing unit 54 is composed of individual data processing units 61-1 and 61-2 and a common data processing unit 62.
- the individual data processing units 61-1 and 61-2 are collectively referred to as the individual data processing unit 61 when there is no need to distinguish between them.
- the individual data processing unit 61 performs channel access operations based on carrier sense, addition of MAC (Media Access Control) headers and error detection codes to data to be transmitted, and concatenation processing of multiple data units.
- MAC Media Access Control
- the individual data processing unit 61 performs processing for decoupling the MAC header of the received data unit, analysis and error detection, and retransmission request operation.
- the common data processing unit 62 performs sequence management of the data held in the communication storage unit 56 and the control information and management information received from the communication control unit 55 at the time of transmission.
- the common data processing unit 62 also performs encryption processing of control information and management information, etc., generates data units, and allocates the generated data units to the individual data processing units 61-1 and 61-2.
- the common data processing unit 62 performs analysis processing and reorder processing of the data unit when receiving.
- the antenna 41, the amplifier 51, the radio interface 52, the signal processor 53, and the individual data processor 61 are grouped together with the same branch number (hereinafter, also referred to as individual communication set) as surrounded by dashed lines. ).
- the individual communication set indicates the AP. If the wireless communication device 11 is non-AP MLD, the dedicated communication set indicates non-AP STA.
- Each set becomes a component of the wireless communication device 11 and performs wireless communication on each link.
- the storage unit 33 may be included in each set.
- the operations of the individual data processing unit 61 and the common data processing unit 62 are not limited to the operations described above, and one of them may perform the operation of the other, for example.
- the individual data processing unit 61 may be defined such that all functions of the common data processing unit 62 are implemented for each individual communication set.
- each link used by each group may have a different frequency band.
- the signal processing unit 53 and the individual data processing unit 61 each have the same branch number, and each of them has one set, and these two sets or three or more sets are connected to one radio interface unit 52. may be
- the communication control section 55 controls the operation of each section of the communication section 31 and information transmission between the sections. Further, the communication control unit 55 performs control to transfer control information and management information to be notified to other wireless communication devices to the individual data processing unit 61 and the common data processing unit 62 .
- the communication control unit 55 has individual control units 71-1 and 71-2 that control each individual communication set, and a common data processing unit 62 and a common control unit 72 that implements control common to each individual communication set.
- the individual control units 71-1 and 71-2 are collectively referred to as the individual control unit 71 when there is no need to distinguish between them.
- the individual control unit 71 transmits control information (length information such as LENGTH) included in the received data unit to other individual control units 71, and sets the transmittable time to other wireless communication devices. Controls each part to transmit the MLO CTS frame containing the designated transmittable time specification information. At this time, the control information may be transmitted via the common control section 72 .
- control information length information such as LENGTH
- the communication storage unit 56 holds information used by the communication control unit 55.
- the communication storage unit 56 also holds data to be transmitted and data received.
- the control unit 32 is composed of a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and the like.
- the control unit 32 executes programs stored in a ROM or the like, and controls the communication unit 31 and the communication control unit 55 . Also, the control unit 32 may perform part of the operation of the communication control unit 55 instead. Also, the communication control unit 55 and the control unit 32 may be configured as one block.
- the storage unit 33 holds information used by the communication unit 31 and the control unit 32. Moreover, the memory
- the storage unit 33 and the communication storage unit 56 may be configured as one block.
- the antenna 41, the amplifier unit 51, and the radio interface unit 52 each have the same branch number, and each group has the same branch number. good too. Also, the communication unit 31 is realized by one or more LSIs.
- the individual data processing unit 61 is also called Lower MAC.
- the common data processing unit 62 is also called Upper MAC or Higher MAC.
- a set of the individual data processing unit 61 and the common data processing unit 62 is also called an AP entity or a non-AP entity.
- the communication control unit 55 is also called an MLD (Multi-link Device) management entity.
- FIG. 7 is a flowchart for explaining the processing of AP MLD1.
- step S11 the communication control unit 55 of AP MLD1 acquires information from peripheral terminals.
- AP2 of AP MLD1 receives Data1 frame from non-AP STA2 in non-STR non-AP MLD2 on link2, and acquires information described in the frame (time T3 in FIG. 5).
- the information on whether the communication direction can be changed in the RDG/More PPDU subfield of the PPDU may be set to 1 using the Reverse Direction Protocol. Also, when acquiring information, information (buffer status report) on the buffer status of subordinate non-AP STAs may be received.
- step S12 the communication control unit 55 of AP MLD1 receives an RTS frame, which is a transmission request, from a certain terminal.
- AP1 of AP MLD1 receives the RTS frame from non-AP STA3 in non-AP MLD2 on link1 (time T4 in FIG. 5).
- the communication control unit 55 of the AP MLD1 determines whether or not it is necessary to designate the transmittable time.
- This determination is carried out based on at least one of the information from the surrounding terminals acquired in step S11, the information in the RTS frame received in step S12, and the information in the wireless communication device 11 of its own. .
- the transmission possible time is specified. determined to be necessary.
- the DL data addressed to MLD which is the source of the Data1 frame received on link2
- the buffer of AP MLD1 it is determined that it is necessary to specify the transmittable time.
- non-AP STA3 needs to transition to doze state (sleep state) within the Duration requested in the RTS frame received by AP MLD1 in step S12. In this case, it is determined that it is necessary to specify the transmittable time.
- step S13 If it is determined in step S13 that it is necessary to specify the transmittable time, the process proceeds to step S14.
- step S14 the communication control unit 55 of AP MLD1 transmits a frame including transmission time specification information on link1 (time T5 in FIG. 5).
- the MLO CTS frame shown in FIG. 5 is transmitted as a frame containing transmission time specification information.
- the device on the receiving side determines whether it is an MLO CTS frame by determining whether an MLO CTS frame with a Control frame extension added is defined in the Frame Control field. For example, even if the MLO CTS frame is not defined in the Frame Control field and the conventional CTS frame is indicated, the Multi-link Extension, which is the extension field following the CTS, is confirmed. It may be requested by a prior frame exchange such as the exchange of Capability information.
- AP MLD1 sets the communication direction changeability information in the RDG/More PPDU subfield to 1 in the MLO CTS frame, for example, using Reverse Direction Protocol. may be able to send data. Also, for example, the transmittable time is set until the transmission end time of non-AP STA2 in non-AP MLD1 on link2.
- control frame of a new format including transmission time specification information may be used instead of the MLO CTS frame as the frame including transmission time specification information.
- the communication control unit 55 of AP MLD1 transmits an ACK3 frame in response to the Data3 frame on link1, and transmits an ACK1 frame in response to the Data1 frame on link2.
- step S15 the communication control unit 55 of AP MLD1 transmits a data frame to the subordinate terminal via link1.
- Single User transmission may be performed with the non-AP STA (non-AP STA2) in the non-AP MLD on link2 as the destination.
- step S13 If it is determined in step S13 that it is not necessary to specify the transmittable time, the process ends.
- FIG. 8 is a flowchart for explaining non-AP MLD processing.
- the communication control unit 55 of the non-AP MLD acquires the transmission right and transmits the RTS frame, which is a transmission request, to the AP MLD (time T4 in FIG. 5).
- step S32 the non-AP MLD communication control unit 55 receives a response frame to the RTS frame transmitted from the AP MLD (time T5 in FIG. 5).
- step S33 the communication control unit 55 of the non-AP MLD determines whether or not the transmittable time is specified in the response frame.
- step S33 it is determined in step S33 that the transmittable time is specified, and the process proceeds to step S34.
- step S34 the non-AP MLD communication control unit 55 transmits the Data frame to the AP MLD in accordance with the transmittable time (time T6 in FIG. 5). After that, the process ends.
- step S33 it is determined in step S33 that the transmittable time is not specified, and the process proceeds to step S35.
- step S35 the non-AP MLD communication control unit 55 transmits the Data frame to the AP MLD. After that, the process ends.
- DL transmission is performed at transmission opportunities acquired by non-AP MLD using the Reverse Direction Protocol that indicates whether to change the direction of communication.
- FIG. 9 is a block diagram showing a hardware configuration example of a computer that executes the series of processes described above by a program.
- a CPU (Central Processing Unit) 301 , a ROM (Read Only Memory) 302 and a RAM (Random Access Memory) 303 are interconnected by a bus 304 .
- An input/output interface 305 is further connected to the bus 304 .
- the input/output interface 305 is connected to an input unit 306 such as a keyboard and a mouse, and an output unit 307 such as a display and a speaker.
- the input/output interface 305 is also connected to a storage unit 308 such as a hard disk or nonvolatile memory, a communication unit 309 such as a network interface, and a drive 310 that drives a removable medium 311 .
- the CPU 301 loads a program stored in the storage unit 308 into the RAM 303 via the input/output interface 305 and the bus 304 and executes the above-described series of processes. is done.
- the program executed by the CPU 301 is recorded on the removable media 311, or provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital broadcasting, and installed in the storage unit 308.
- the program executed by the computer may be a program that is processed in chronological order according to the order described in this specification, or may be executed in parallel or at a necessary timing such as when a call is made. It may be a program in which processing is performed.
- a system means a set of multiple components (devices, modules (parts), etc.), and it does not matter whether all the components are in the same housing. Therefore, a plurality of devices housed in separate housings and connected via a network, and a single device housing a plurality of modules in one housing, are both systems. .
- Embodiments of the present technology are not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present technology.
- this technology can take the configuration of cloud computing in which one function is shared by multiple devices via a network and processed jointly.
- each step described in the flowchart above can be executed by a single device, or can be shared by a plurality of devices.
- one step includes multiple processes
- the multiple processes included in the one step can be executed by one device or shared by multiple devices.
- This technique can also take the following configurations.
- the wireless communication device according to .
- the communication control unit controls the transmission request time indicated by the transmission request frame received on the first link before the transmission end time of the second frame transmitted by the wireless communication terminal on the second link. is long, the radio communication apparatus according to (2) above determines that the transmittable time is designated and causes the transmittable time designation information to be transmitted.
- the transmittable time designated by the transmittable time designation information is a transmission end time of the second frame being transmitted on the second link.
- the wireless communication device causes the transmittable time specification information to be transmitted in a response frame to the transmission request frame.
- the wireless communication device is an extension response frame to which an extension field including the transmittable time specification information is added.
- the response frame includes information indicating to change the direction of communication.
- the communication control unit After receiving the first frame transmitted from the wireless communication terminal over the first link, the communication control unit instructs at least one of the wireless communication terminal and another wireless communication terminal to perform the first frame.
- the wireless communication device wherein the third frame is transmitted on one link.
- a wireless communication device Communicate with a wireless communication terminal using multiple links, Transmissible time specification information specifying a transmittable time of the wireless communication terminal on the first link when a transmission request frame of the first frame transmitted from the wireless communication terminal on the first link is received.
- a wireless communication device a communication unit that performs communication with a plurality of links, specified in transmittable time specification information included in a response frame transmitted by the wireless communication device in response to the transmission request frame of the first frame transmitted to the wireless communication device over the first link and a communication control unit configured to transmit the first frame to the wireless communication device through the first link in accordance with the transmittable time of the first frame through the first link.
- the communication control unit determines whether or not the transmittable time specification information is included in the response frame.
- the response frame is an extended response frame to which an extended field containing the transmittable time designation information is added.
- the extended response frame includes information indicating changing the direction of communication.
- the wireless communication terminal Communicate with a wireless communication device over a plurality of links, specified in transmittable time specification information included in a response frame transmitted by the wireless communication device in response to the transmission request frame of the first frame transmitted to the wireless communication device over the first link transmitting the first frame to the wireless communication device over the first link in accordance with a transmittable time of the first frame over the first link.
- 11 wireless communication device 31 communication section, 54 data processing section, 55 communication control section, 54 communication storage section, 61, 61-1, 61-2 individual data processing section, 62 common data processing section, 71, 71-1, 71-2 individual control unit, 72 common control unit
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Abstract
Description
1.システム構成
2.従来技術
3.実施の形態
4.その他
<無線通信システムの構成例>
図1は、本技術の実施の形態に係る無線通信システムの構成例を示す図である。
上述したように、MLDは、複数のリンクを用いて伝送を行う。しかしながら、MLDにおいては、リンク間の周波数の近接度合などの要因から、あるリンクでの送信信号が漏洩し、他のリンクでの受信信号に対する干渉が強く通信品質が劣化する場合がある。
図2は、non-STR non-AP MLDが、MediumSyncDelayにより待機する際のシーケンスを示す図である。
図3は、図2の場合のMediumSyncDelayの待機中に、non-AP STA2がData2フレームの送信を開始する際のシーケンスを示す図である。
本技術においては、複数のlinkでの通信において、link1でnon-AP STAからRTSフレームを受信した場合に、その応答として、link1で、送信可能時間を指定する送信可能時間指定情報が送信される。
図4は、送信可能時間指定情報を含むMLO CTSフレームのMAC層における構成例を示す図である。
図5は、本技術におけるシーケンス例を示す図である。
図6は、本技術を適用する無線通信装置の構成例を示すブロック図である。
図7は、AP MLD1の処理を説明するフローチャートである。
図8は、non-AP MLDの処理を説明するフローチャートである。
以上のように、本技術においては、non-STR non-AP MLDがlink1で送信している際に、link2で他のnon-AP MLDの送信時間が、link1でのnon-STR non-AP MLDの送信時間に合わせて調整される。
上述した一連の処理は、ハードウェアにより実行することもできるし、ソフトウェアにより実行することもできる。一連の処理をソフトウェアにより実行する場合には、そのソフトウェアを構成するプログラムが、専用のハードウェアに組み込まれているコンピュータ、または汎用のパーソナルコンピュータなどに、プログラム記録媒体からインストールされる。
本技術は、以下のような構成をとることもできる。
(1)
無線通信端末と、複数のリンクでの通信を行う通信部と、
前記無線通信端末から第1のリンクで送信されてくる第1のフレームの送信要求フレームを受信した場合、前記無線通信端末の前記第1のリンクでの送信可能時間を指定する送信可能時間指定情報を、前記無線通信端末に対して送信させる通信制御部と
を備える無線通信装置。
(2)
前記通信制御部は、第2のリンクで受信した第2のフレーム、前記第1のリンクで受信した前記送信要求フレーム、および自身の装置内の情報のうち、少なくとも1つに基づいて、前記第1のリンクでの前記送信可能時間を指定するか否かを判定し、前記第1のリンクでの前記送信可能時間を指定すると判定した場合、前記送信可能時間指定情報を送信させる
前記(1)に記載の無線通信装置。
(3)
前記通信制御部は、前記無線通信端末が前記第2のリンクで送信している前記第2のフレームの送信終了時間よりも、前記第1のリンクで受信した前記送信要求フレームが示す送信要求時間が長い場合、前記送信可能時間を指定すると判定して、前記送信可能時間指定情報を送信させる
前記(2)に記載の無線通信装置。
(4)
前記送信可能時間指定情報において指定される前記送信可能時間は、前記第2のリンクで送信している前記第2のフレームの送信終了時間である
前記(3)に記載の無線通信装置。
(5)
前記通信制御部は、前記送信可能時間指定情報を、前記送信要求フレームに対する応答フレームにより送信させる
前記(1)乃至(4)のいずれかに記載の無線通信装置。
(6)
前記応答フレームは、前記送信可能時間指定情報が含まれる拡張フィールドを追加した拡張応答フレームである
前記(5)に記載の無線通信装置。
(7)
前記応答フレームは、通信の方向を変えることを示す情報を含む
前記(6)に記載の無線通信装置。
(8)
前記通信制御部は、前記無線通信端末から前記第1のリンクで送信されてくる前記第1のフレームの受信後、前記無線通信端末および他の無線通信端末の少なくとも1つに対して、前記第1のリンクで、第3のフレームを送信させる
前記(7)に記載の無線通信装置。
(9)
無線通信装置が、
無線通信端末と、複数のリンクでの通信を行い、
前記無線通信端末から第1のリンクで送信されてくる第1のフレームの送信要求フレームを受信した場合、前記無線通信端末の前記第1のリンクでの送信可能時間を指定する送信可能時間指定情報を、前記無線通信端末に対して送信させる
無線通信方法。
(10)
無線通信装置と、複数のリンクでの通信を行う通信部と、
前記無線通信装置に対して第1のリンクで送信した第1のフレームの送信要求フレームに対して、前記無線通信装置が送信してくる応答フレームに含まれている送信可能時間指定情報において指定されている前記第1のリンクでの前記第1のフレームの送信可能時間に合わせて、前記第1のリンクで、前記第1のフレームを前記無線通信装置に対して送信させる通信制御部と
を備える無線通信端末。
(11)
前記通信制御部は、前記応答フレームに、前記送信可能時間指定情報が含まれているか否かを判定し、前記送信可能時間指定情報が含まれていると判定した場合、前記送信可能時間に合わせて、前記第1のリンクで、前記第1のフレームを前記無線通信装置に対して送信させる
前記(10)に記載の無線通信端末。
(12)
前記送信可能時間指定情報において指定される前記送信可能時間は、他の無線通信端末が第2のリンクで送信している第2のフレームの送信終了時間である
前記(11)に記載の無線通信端末。
(13)
前記応答フレームは、前記送信可能時間指定情報が含まれる拡張フィールドを追加した拡張応答フレームである
前記(11)または(12)に記載の無線通信端末。
(14)
前記拡張応答フレームは、通信の方向を変えることを示す情報を含む
前記(13)に記載の無線通信端末。
(15)
無線通信端末が、
無線通信装置と、複数のリンクでの通信を行い、
前記無線通信装置に対して第1のリンクで送信した第1のフレームの送信要求フレームに対して、前記無線通信装置が送信してくる応答フレームに含まれている送信可能時間指定情報において指定されている前記第1のリンクでの前記第1のフレームの送信可能時間に合わせて、前記第1のリンクで、前記第1のフレームを前記無線通信装置に対して送信させる
無線通信方法。
Claims (15)
- 無線通信端末と、複数のリンクでの通信を行う通信部と、
前記無線通信端末から第1のリンクで送信されてくる第1のフレームの送信要求フレームを受信した場合、前記無線通信端末の前記第1のリンクでの送信可能時間を指定する送信可能時間指定情報を、前記無線通信端末に対して送信させる通信制御部と
を備える無線通信装置。 - 前記通信制御部は、第2のリンクで受信した第2のフレーム、前記第1のリンクで受信した前記送信要求フレーム、および自身の装置内の情報のうち、少なくとも1つに基づいて、前記第1のリンクでの前記送信可能時間を指定するか否かを判定し、前記第1のリンクでの前記送信可能時間を指定すると判定した場合、前記送信可能時間指定情報を送信させる
請求項1に記載の無線通信装置。 - 前記通信制御部は、前記無線通信端末が前記第2のリンクで送信している前記第2のフレームの送信終了時間よりも、前記第1のリンクで受信した前記送信要求フレームが示す送信要求時間が長い場合、前記送信可能時間を指定すると判定して、前記送信可能時間指定情報を送信させる
請求項2に記載の無線通信装置。 - 前記送信可能時間指定情報において指定される前記送信可能時間は、前記第2のリンクで送信している前記第2のフレームの送信終了時間である
請求項3に記載の無線通信装置。 - 前記通信制御部は、前記送信可能時間指定情報を、前記送信要求フレームに対する応答フレームにより送信させる
請求項1に記載の無線通信装置。 - 前記応答フレームは、前記送信可能時間指定情報が含まれる拡張フィールドを追加した拡張応答フレームである
請求項5に記載の無線通信装置。 - 前記応答フレームは、通信の方向を変えることを示す情報を含む
請求項6に記載の無線通信装置。 - 前記通信制御部は、前記無線通信端末から前記第1のリンクで送信されてくる前記第1のフレームの受信後、前記無線通信端末および他の無線通信端末の少なくとも1つに対して、前記第1のリンクで、第3のフレームを送信させる
請求項7に記載の無線通信装置。 - 無線通信装置が、
無線通信端末と、複数のリンクでの通信を行い、
前記無線通信端末から第1のリンクで送信されてくる第1のフレームの送信要求フレームを受信した場合、前記無線通信端末の前記第1のリンクでの送信可能時間を指定する送信可能時間指定情報を、前記無線通信端末に対して送信させる
無線通信方法。 - 無線通信装置と、複数のリンクでの通信を行う通信部と、
前記無線通信装置に対して第1のリンクで送信した第1のフレームの送信要求フレームに対して、前記無線通信装置が送信してくる応答フレームに含まれている送信可能時間指定情報において指定されている前記第1のリンクでの前記第1のフレームの送信可能時間に合わせて、前記第1のリンクで、前記第1のフレームを前記無線通信装置に対して送信させる通信制御部と
を備える無線通信端末。 - 前記通信制御部は、前記応答フレームに、前記送信可能時間指定情報が含まれているか否かを判定し、前記送信可能時間指定情報が含まれていると判定した場合、前記送信可能時間に合わせて、前記第1のリンクで、前記第1のフレームを前記無線通信装置に対して送信させる
請求項10に記載の無線通信端末。 - 前記送信可能時間指定情報において指定される前記送信可能時間は、他の無線通信端末が第2のリンクで送信している第2のフレームの送信終了時間である
請求項11に記載の無線通信端末。 - 前記応答フレームは、前記送信可能時間指定情報が含まれる拡張フィールドを追加した拡張応答フレームである
請求項11に記載の無線通信端末。 - 前記拡張応答フレームは、通信の方向を変えることを示す情報を含む
請求項13に記載の無線通信端末。 - 無線通信端末が、
無線通信装置と、複数のリンクでの通信を行い、
前記無線通信装置に対して第1のリンクで送信した第1のフレームの送信要求フレームに対して、前記無線通信装置が送信してくる応答フレームに含まれている送信可能時間指定情報において指定されている前記第1のリンクでの前記第1のフレームの送信可能時間に合わせて、前記第1のリンクで、前記第1のフレームを前記無線通信装置に対して送信させる
無線通信方法。
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Title |
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MATTHEW FISCHER (BROADCOM INC): "MLO-Synch-Transmission", IEEE DRAFT; 11-20-0081-03-00BE-MLO-SYNCH-TRANSMISSION, vol. 802.11 EHT; 802.11be, no. 3, 17 April 2020 (2020-04-17), Piscataway, NJ USA , pages 1 - 59, XP068167521 * |
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