WO2017154320A1 - 無線lanシステム、無線lan基地局、無線lan端末、通信方法 - Google Patents
無線lanシステム、無線lan基地局、無線lan端末、通信方法 Download PDFInfo
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- WO2017154320A1 WO2017154320A1 PCT/JP2017/000134 JP2017000134W WO2017154320A1 WO 2017154320 A1 WO2017154320 A1 WO 2017154320A1 JP 2017000134 W JP2017000134 W JP 2017000134W WO 2017154320 A1 WO2017154320 A1 WO 2017154320A1
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Classifications
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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
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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
- 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
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
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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 present disclosure relates to a wireless LAN (Local Area Network) system, a wireless LAN base station, a wireless LAN terminal, and a communication method.
- a wireless LAN Local Area Network
- next generation communication method 802.11ax (HEW: High Efficiency WLAN (Wireless LAN)) is being studied in the task group TGax.
- Next generation communication method 802.11ax adopts new modulation / demodulation method (1024QAM (QuadraturerAmplitude Modulation)), support for uplink MU-MIMO (Multi User Multi-Input Multi-Output), OFDMA (Orthogonal frequency-) The introduction of division (multiple access) is expected.
- FIG. 1 is a diagram showing a basic configuration example of a wireless LAN system.
- This wireless LAN system includes an access point AP and a plurality of terminals STA 1 to STAn.
- terminal STA terminal STA 1 to STAn.
- terminal STA terminal STA 1 to STA n.
- a network called BSS Basic Service Set
- BSS Base Service Set
- CSMA / CA Carrier Sense Multiple Access with Collision Avoidance
- DCF Distributed Coordination Function
- HEW IEEE 802.11ax
- UL MU Uplink Multi-user
- the access point AP concentrates on multiple terminals STA1 to STAn. Control is performed, the communication resource is divided into a plurality of unit resources (resource unit (RU)), and resource units are allocated to a plurality of terminals STA 1 to STA n. As a result, a plurality of terminals STA 1 to STA n can communicate simultaneously.
- resource unit resource unit
- Step 1 The procedure of uplink multiuser communication will be described with reference to FIG. 2 (see Non-Patent Document 1).
- Step 1 The terminal STA notifies the access point AP in advance of a buffer status (buffer status) indicating that there is uplink data waiting for transmission.
- Step 2 The access point AP transmits a trigger frame (Trigger frame) for assigning the resource unit RU to the plurality of terminals STA 1 to STA n in the BSS (time t1).
- a trigger frame Trigger frame
- the access point AP allocates four resource units RU to different terminals STA. Therefore, the access point AP triggers information on the four resource units RU and a terminal ID (Identifier) (for example, AID (Association ID)) that specifies the terminal STA to which each of the four resource units RU is assigned. Include in the frame.
- the terminal STA uses a resource unit RU assigned to itself to use UL MU PPDU (PLCP (Physical Layer Convergence Protocol) Protocol Data including uplink data. Unit) frame is transmitted to the access point AP (time t2).
- PLCP Physical Layer Convergence Protocol
- Unit UL MU PPDU
- four terminals STA 1 to STA 4 transmit uplink data to the access point AP.
- Step 3 The access point AP transmits an ACK frame (Acknowledgement frame) for notifying the success or failure of communication to the plurality of terminals STA 1 to STA n in the BSS (time t3).
- ACK frame Acknowledgement frame
- the uplink multi-user communication described with reference to FIG. 2 has a problem that the terminal STA cannot always notify the access point AP of the buffer status in advance. Further, when AID is used as the terminal ID, there is a problem that the terminal STA before the association cannot perform uplink multiuser communication (see Non-Patent Document 2).
- Step 1 The terminal STA with the uplink data waiting for transmission sets an initial value in its own back-off counter. As the initial value, a value within a range from 0 to the maximum count value of the back-off counter is selected at random.
- Step 2 The access point AP transmits a trigger frame for random access (TF-R) for assigning resource units RU to a plurality of terminals STA 1 to STA n in the BSS (time t1).
- the access point AP notifies the five resource units RU 1 to RU 5.
- the access point AP does not assign the resource units RU 1 to RU 5 to a specific terminal STA, and allows random access. Therefore, the access point AP has information on the resource units RU 1 to RU 5 and a special terminal ID indicating that each of the resource units RU 1 to RU 5 can be randomly accessed (AID 0 in the example of FIG. 3). Are included in the trigger frame for random access.
- the terminal STA having a value other than 0 in the back-off counter decrements the count value every predetermined time by five resource units RU 1 to RU 5 in which special terminal IDs are designated. As a result, the terminal STA having a count value of 0 selects one resource unit RU, and transmits a UL MU PPDU frame including uplink data to the access point AP using the selected resource unit RU. (Time t2). Here, terminal STA 2 transmits uplink data using resource unit RU 1, and terminal STA 1 transmits uplink data using resource unit RU 3.
- Step 3 The access point AP transmits an ACK frame notifying the success or failure of communication to the plurality of terminals STA 1 to STA n in the BSS (time t3). If the initial values randomly set in the back-off counter are the same between the terminals STA, an uplink data collision may occur at time t2. If the terminal STA cannot communicate correctly due to an uplink data collision or the like, the terminal STA can determine this from the ACK frame. Therefore, the terminal STA that could not communicate correctly returns to the procedure 1, sets a random initial value in the back-off counter again, and waits for an uplink data retransmission opportunity.
- IEEE 802.11-15 / 0365r0 “UL MU procedure”, 2015-03-09 IEEE 802.11-15 / 0875r1, “Random Access with Trigger Frames using OFDMA”, 2015-07-13 IEEE 802.15-15 / 0132r15, “Specification Framework for TGax”, 2016-01-28
- the random access procedure in the uplink multi-user communication described with reference to FIG. 3 has a problem that the communication efficiency is very low because there is a possibility of collision of uplink data.
- one of the objects of the present disclosure is to provide a wireless LAN system, a wireless LAN base station, a wireless LAN terminal, and a communication method capable of improving communication efficiency in uplink multiuser communication.
- a wireless local area network (LAN) system is A wireless LAN base station, A plurality of wireless LAN terminals that perform uplink multi-user communication with the wireless LAN base station, and
- the wireless LAN base station is A trigger frame for assigning a predetermined resource unit including a terminal ID (Identifier) for designating a wireless LAN terminal before association among the plurality of wireless LAN terminals is transmitted to the plurality of wireless LAN terminals,
- the wireless LAN terminal before the association is When the temporary terminal ID designating itself is included in the trigger frame, the predetermined resource unit is selected and uplink data is transmitted to the wireless LAN base station.
- a wireless local area network (LAN) base station A wireless LAN base station that performs uplink multi-user communication with a plurality of wireless LAN terminals, A communication department; And a processor, The processor is Including a terminal ID (Identifier) for designating a wireless LAN terminal before association among the plurality of wireless LAN terminals, generating a trigger frame for assigning a predetermined resource unit; The communication unit is The trigger frame is transmitted to the plurality of wireless LAN terminals.
- LAN local area network
- a wireless LAN (Local Area Network) terminal is A wireless LAN terminal among a plurality of wireless LAN terminals performing uplink multiuser communication with a wireless LAN base station, A communication department; And a processor, The processor is Whether or not the terminal is a wireless LAN terminal before association, and a trigger frame for allocating a predetermined resource unit received from the wireless LAN base station includes a terminal ID (Identifier) designating itself Judgment, The communication unit is Based on the determination, the predetermined resource unit is selected, and uplink data is transmitted to the wireless LAN base station.
- a terminal ID Identity
- the communication method comprises: A communication method by a wireless LAN base station that performs uplink multi-user communication with a plurality of wireless LAN (Local Area Network) terminals, A trigger frame for allocating a predetermined resource unit including a terminal ID (Identifier) for designating a wireless LAN terminal before association among the plurality of wireless LAN terminals is transmitted to the plurality of wireless LAN terminals.
- a communication method by a wireless LAN base station that performs uplink multi-user communication with a plurality of wireless LAN (Local Area Network) terminals
- a trigger frame for allocating a predetermined resource unit including a terminal ID (Identifier) for designating a wireless LAN terminal before association among the plurality of wireless LAN terminals is transmitted to the plurality of wireless LAN terminals.
- the communication method comprises: A communication method using one wireless LAN terminal among a plurality of wireless LAN terminals performing uplink multiuser communication with a wireless LAN (Local Area Network) base station,
- a wireless LAN Local Area Network
- the self-association wireless LAN terminal and the trigger frame for allocating a predetermined resource unit received from the wireless LAN base station includes a terminal ID (Identifier) for specifying itself
- the predetermined resource unit is selected and uplink data is transmitted to the wireless LAN base station.
- FIG. 4 is a diagram illustrating a configuration example of a wireless LAN system in some aspects.
- the wireless LAN system from a certain point of view includes an access point AP and a plurality of terminals STA 1 to STA n.
- the access point AP is an example of a wireless LAN base station
- the terminals STA 1 to STA n are examples of wireless LAN terminals.
- terminal STA when it is not specified which terminal STA 1 to STA n, it is referred to as terminal STA.
- six terminals STA are shown as an example, but the number of terminals STA may be two or more (that is, n is two or more).
- the access point AP and the terminals STA 1 to STA n constitute a BSS.
- the wireless LAN system in a certain aspect is applicable to both uplink OFDMA and uplink MU-MIMO uplink multiuser communication.
- terminals STA 1 to STA 3 are terminals STA already associated with the access point AP, and terminals STA 4 and STA 5 are terminals STA before association to the access point AP.
- AID 1 to AID 3 are set as terminal IDs for the associated terminals STA 1 to STA 3, but AIDs are set to the terminals STA 4 and STA 5 before the association. It shall not be.
- the random access procedure in the uplink multiuser communication described in FIG. 3 has a very low communication efficiency.
- the terminal STA before the association can participate only in random access, the state of low communication efficiency continues until the association.
- the communication efficiency is improved by introducing a temporary terminal ID that specifies the terminal STA before the association.
- a temporary terminal ID that specifies the terminal STA before the association will be described.
- FIG. 5 is a diagram for explaining a first example of a temporary terminal ID that designates a terminal STA before association in a certain point of view.
- the access point AP transmits a trigger frame for notifying the resource unit RU to a plurality of terminals STA 1 to STA n in the BSS.
- the access point AP notifies the five resource units RU 1 to RU 5.
- the access point AP assigns resource units RU 1 to RU 3 to the associated terminals STA 1 to STA 3, respectively, but does not assign resource units RU 4 and RU 5 to a specific terminal STA. Set as possible.
- information on resource units RU 1 to RU 5 information on resource units RU 1 to RU 5, information AID 1 to AID 3 that specifies terminals STA 1 to STA 3 to which resource units RU 1 to RU 3 are assigned, and resource units RU 4 and RU 5 are random.
- the trigger frame at time t1 includes AIDs 1 to AID 3 that specify terminals STA 1 to STA 3 to which resource units RU 1 to RU 3 are assigned.
- the terminals STA1 to STA3 specified by AID1 to AID3 use the resource units RU1 to RU3 assigned to themselves, and use the UL including upstream data to the access point AP.
- the trigger frame at time t1 includes AIDA0 indicating that the resource units RU 4 and RU 5 can be randomly accessed. Therefore, in Example 1, at time t2, the terminal STA 5 accesses the resource unit RU 4 to obtain the access right of the resource unit RU 4 and uses the resource unit RU 4 for the access point AP.
- a UL-MU-PPDU frame containing upstream data is transmitted.
- the resource unit RU 5 has a collision of uplink data and cannot communicate correctly.
- the two resource units RU-4, RU-5 can be randomly accessed, and there is a possibility that uplink data collision will occur. Therefore, communication efficiency is low.
- the access point AP transmits an ACK frame notifying the success or failure of communication to the plurality of terminals STA 1 to STA n in the BSS.
- the access point AP transmits a trigger frame notifying the resource unit RU to a plurality of terminals STA 1 to STA n in the BSS.
- the access point AP notifies the five resource units RU ⁇ 1 to RU ⁇ ⁇ 5 in the same manner as the trigger frame at time t1.
- the access point AP assigns the resource units RU 1 to RU 3 to the associated terminals STA 1 to STA 3, respectively, and sets the resource unit RU 5 to be randomly accessible without assigning to the specific terminal STA.
- the access point AP assigns the resource unit RU 4 to the terminal STA 5 before the association. Since the terminal STA 5 is the terminal STA before the association, no AID is set.
- the access point AP designates the terminal STA 5 before association with a temporary terminal ID that can identify the terminal STA 5 as shown as UAID 5 in FIG.
- the UAID 5 may be designed so that the values generated independently by the access point AP and the terminal STA 5 match.
- the access point AP and the terminal STA 5 process the MAC (Media Access Control) address of the terminal STA 5 with a predetermined process, and the UAID 5 so as to fit in the information element (14 bits) that stores the AID in the trigger frame. May be generated.
- the access point AP and the terminal STA 5 may add information indicating that the terminal ID is a temporary terminal ID by adding 1 bit or more to the normal AID value as the UAID 5.
- the access point AP and the terminal STA 5 need to generate UAID 5 so that they can be distinguished from normal AID values.
- the access point AP and the terminal STA 5 delete the UAID 5 and complete the management of the UAID 5.
- the access point AP designates the information of the resource units RU 1 to RU 5 and the terminals STA 1 to STA 3 to which the resource units RU 1 to RU 3 are assigned AID 1 to AID 3
- UAID 5 that is a temporary terminal ID that designates the terminal STA 5 to which the resource unit RU 4 is assigned, and AID 0 that indicates that the resource unit RU 5 is randomly accessible.
- the trigger frame at time t3 includes AID 1 to AID 3 specifying terminals STA 1 to STA 3 to which resource units RU 1 to RU 3 are assigned.
- terminals STA 1 to STA 3 specified by AID 1 to AID 3 use the resource units RU 1 to RU 3 assigned to themselves, respectively, and access point AP contains UL data.
- the trigger frame at time t3 includes UAID 5 which is a temporary terminal ID for designating the terminal STA 5 to which the resource unit RU 4 is allocated.
- the terminal STA 5 also generates the UAID 5 as a temporary terminal ID for designating itself, and compares the generated UAID 5 with the terminal ID transmitted from the access point AP.
- the terminal STA 5 determines that the terminal ID specifying itself is included in the trigger frame.
- the terminal STA 5 specified by the UAID 5 transmits a UL MU PPDU frame including uplink data to the access point AP using the resource unit RU 4 assigned to itself.
- the trigger frame at time t3 includes AID ⁇ ⁇ ⁇ 0 indicating that the resource unit RU 5 can be accessed randomly.
- the terminal STA X other than the terminals STA 1 to STA 3 and STA 5 accesses the resource unit RU 5, acquires the access right of the resource unit RU 5, and sends the resource unit RU to the access point AP.
- the access point AP transmits an ACK frame notifying the success or failure of communication to the plurality of terminals STA 1 to STA n in the BSS.
- the terminal STA X that has transmitted the uplink data using the resource unit RU 5 at time t4 can be specified by the UAID even if it is the terminal STA before the association. From this, the access point AP can next allocate the resource unit RU-5 to the terminal STA-X. As a result, since the uplink data does not collide even in the resource unit RU 5 next time, the communication efficiency is further improved.
- FIG. 6 is a diagram for explaining a second example of a temporary terminal ID that designates a terminal STA before association in a certain point of view.
- the transmission of the trigger frame at time t1 and the transmission of the UL MU PPDU frame at time t2 are the same as in FIG. Similarly to FIG. 5, it is assumed that the access point AP transmits an ACK frame after transmitting the UL MU PPDU frame at time t2.
- the access point AP transmits a trigger frame notifying the resource unit RU to a plurality of terminals STA 1 to STA n in the BSS.
- the access point AP notifies the five resource units RU 1 to RU 5 similarly to the trigger frame at time t1.
- the access point AP assigns the resource units RU 1 to RU 3 to the associated terminals STA 1 to STA 3, respectively, and sets the resource unit RU 5 to be randomly accessible without assigning to the specific terminal STA.
- the access point AP assigns the resource unit RU 4 to the terminal STA 5 before the association. Since the terminal STA 5 is the terminal STA before the association, no AID is set.
- the access point AP is specially defined as the terminal STA 5 before the association is shown as NULL in FIG. 6, and is a temporary value that is a common value common to the plurality of terminals STA 1 to STA n. Specify a unique terminal ID.
- the temporary terminal ID (for example, NULL) may be an AID value in which all bits are 0, or may be one or more other bits.
- the access point AP includes NULL, which is a temporary terminal ID that designates the terminal STA 5 to which the resource unit RU 4 is allocated.
- NULL is a common value, even if terminal STA 5 receives a trigger frame including NULL, terminal STA 5 cannot immediately determine whether or not it specifies terminal STA 5.
- the terminal STA 5 knows that the uplink data has been successfully transmitted at time t2 by the ACK frame received from the access point AP immediately before time t3. From this, the terminal STA 5 can indirectly know that NULL designates the terminal STA 5.
- the common value serving as a temporary terminal ID is not limited to NULL.
- the access point AP needs to generate a common value so that it can be distinguished from a normal AID value.
- the access point AP designates the information of the resource units RU 1 to RU 5 and the terminals STA 1 to STA 3 to which the resource units RU 1 to RU 3 are assigned AID 1 to AID 3 And NULL, which is a temporary terminal ID for designating the terminal STA 5 to which the resource unit RU 4 is assigned, and AID 0 indicating that the resource unit RU 5 is randomly accessible.
- the trigger frame at time t3 includes AID 1 to AID 3 specifying terminals STA 1 to STA 3 to which resource units RU 1 to RU 3 are assigned.
- terminals STA 1 to STA 3 specified by AID 1 to AID 3 use the resource units RU 1 to RU 3 assigned to themselves, respectively, and access point AP contains UL data.
- the trigger frame at time t3 includes NULL, which is a temporary terminal ID that designates the terminal STA 5 to which the resource unit RU 4 is allocated. However, even if the terminal STA 5 receives a trigger frame including the common value NULL, it cannot immediately determine whether or not the terminal STA 5 specifies the terminal STA 5.
- the terminal STA 5 knows that the uplink data has been successfully transmitted at time t2 from the ACK frame received immediately before time t3. From this, the terminal STA 5 can determine that NULL designates the terminal STA 5. Therefore, the terminal STA 5 specified by NULL transmits a UL MU PPDU frame including uplink data to the access point AP using the resource unit RU 4 assigned to itself.
- the trigger frame at time t3 includes AID ⁇ ⁇ ⁇ 0 indicating that the resource unit RU 5 can be accessed randomly.
- the terminal STA X other than the terminals STA 1 to STA 3 and STA 5 accesses the resource unit RU 5, acquires the access right of the resource unit RU 5, and sends the resource unit RU to the access point AP.
- 5 is used to transmit UL-MU-PPDU frames containing upstream data.
- the resource unit RU-4 can be assigned to the terminal STA-5 before association. Therefore, no uplink data collision occurs in the resource unit RU 4.
- collision of uplink data may occur only in the resource unit RU 5 that can be accessed randomly, so that the communication efficiency is improved.
- the access point AP transmits an ACK frame notifying the success or failure of communication to the plurality of terminals STA 1 to STA n in the BSS.
- the terminal STA X that has transmitted the uplink data using the resource unit RU 5 at time t4 can be designated by NULL even if it is the terminal STA before the association. Also, the terminal STA X can determine that the uplink data transmission using the resource unit RU 5 at time t4 has succeeded by the ACK frame received from the access point AP. From this, the access point AP can next allocate the resource unit RU-5 to the terminal STA-X. As a result, since the uplink data does not collide even in the resource unit RU 5 next time, the communication efficiency is further improved.
- the terminal STA before association Is included in the trigger frame that notifies the resource unit RU.
- the access point AP can assign the resource unit RU by designating the terminal STA before the association with the temporary terminal ID, the terminal STA before the association can be updated even in a procedure other than the random access. It can participate in link multiuser communication and can transmit uplink data to the access point AP. Thereby, communication efficiency can be improved.
- the terminal STA transmits a UL MU PPDU frame including uplink data at time t2, but the information transmitted by the terminal STA is not limited to this.
- the UL MU PPDU frame at time t2 may include buffer status indicating that there is uplink data waiting to be transmitted instead of uplink data, or may include buffer status in addition to the uplink data. . If the UL MU PPDU frame includes uplink data and buffer status, the buffer status indicates that there is uplink data waiting to be transmitted in addition to the uplink data transmitted together with the buffer status.
- two-stage uplink multi-user communication will further improve communication efficiency.
- two-stage uplink multiuser communication will be described.
- FIG. 7 illustrates an example of two-stage uplink multi-user communication between an access point AP and a plurality of terminals STA 1 to STA n in one aspect.
- the access point AP assigns the resource units RU 1 to RU 3 to the associated terminals STA 1 to STA 3, respectively, but does not assign the resource units RU 4 and RU 5 to a specific terminal STA, and allows random access.
- the access point AP receives information on resource units RU 1 to RU 5, AID 1 to AID 3 that specifies terminals STA 1 to STA 3 to which resource units RU 1 to RU 3 are assigned, and resource unit RU 4.
- AID 0 indicating that RU 5 is randomly accessible is included in the trigger frame and transmitted to a plurality of terminals STA 1 to STA n in the BSS.
- the terminals STA 1 and STA 2 designated by AID 1 and AID 2 use the resource units RU 1 and RU 2 assigned to themselves, respectively.
- a UL MU PPDU frame is transmitted to the access point AP.
- the terminal STA 5 accesses the resource unit RU 4 indicated by AID 0 and acquires the access right of the resource unit RU 4. Therefore, terminal STA 5 uses resource unit RU 4 to transmit an UL MU PPDU frame including buffer status instead of uplink data to access point AP.
- the access point AP has the terminal STA 5 before association, and recognizes that there is uplink data waiting to be transmitted by transmitting buffer status. Therefore, the access point AP includes a temporary terminal ID that designates the terminal STA 5 to which the resource unit RU 4 is assigned in the trigger frame transmitted in the second stage. Thereafter, the access point AP transmits an ACK frame notifying the success or failure of communication to the plurality of terminals STA 1 to STA n in the BSS. From the ACK frame received from the access point AP, the terminal STA 5 knows the success or failure of the communication of the buffer status to the access point AP at time t2.
- the access point AP assigns the resource units RU 1 and RU 2 to the associated terminals STA 1 and STA 2, respectively, and assigns the resource unit RU 4 to the pre-association terminal STA 5 that has transmitted the buffer status.
- the access point AP transmits information on resource units RU 1 to RU 5, AID 1 and AID 2 that specify terminals STA 1 and STA 2 to which resource units RU 1 and RU 2 are assigned, and resource unit RU 4
- the temporary terminal ID (for example, UAID 5 or NULL) specifying the terminal STA 5 to be allocated is included in the trigger frame and transmitted to a plurality of terminals STA 1 to STA n in the BSS.
- the access point AP may set the resource units RU 3 and RU 5 to be randomly accessible or may be assigned to a specific terminal STA.
- the access point AP includes information indicating that the resource units RU 3 and RU 5 are set to be randomly accessible or assigned to a specific terminal STA in the trigger frame at the time t3.
- the terminals STA 1 and STA 2 specified by AID 1 and AID 2 respectively use the resource units RU 1 and RU 2 assigned to themselves, A UL-MU-PPDU frame including uplink data is transmitted to the access point AP. Since terminal STA 5 is designated by a temporary terminal ID, it can be determined that resource unit RU 4 has been assigned to terminal STA 5. Therefore, the terminal STA 5 also uses the resource unit RU 4 assigned to itself to transmit a UL MU PPDU frame including uplink data to the access point AP. Thereafter, the access point AP transmits an ACK frame notifying the success or failure of communication to the plurality of terminals STA 1 to STA n in the BSS.
- the access point AP can allocate the resource unit RU 4 to the terminal STA 5 before association. Therefore, no uplink data collision occurs in the resource unit RU 4. As a result, communication efficiency is improved. Accordingly, the total communication efficiency can be improved by performing the second-stage communication over a longer time than the first-stage communication.
- uplink multiuser communication is performed in two stages, the first stage and the second stage.
- the access point AP transmits a special value indicating that the resource unit RU is randomly accessible in the trigger frame, and the terminal STA before the association uses the resource unit RU to buffer Send status.
- the access point AP allocates a resource unit RU to the pre-association terminal STA that sent the buffer status in the first stage, and uses the temporary terminal ID that specifies the pre-association terminal STA as a trigger frame. Include and send.
- the total communication efficiency can be improved by performing the second-stage communication over a longer time than the first-stage communication.
- the terminal STA has transmitted a UL MU MU PPDU frame including a buffer status at time t2, but the information transmitted by the terminal STA is not limited to this.
- the UL-MU-PPDU frame may include uplink data in addition to the buffer status.
- the buffer status indicates that there is upstream data waiting to be transmitted in addition to the upstream data transmitted together with the buffer status.
- FIG. 8 is a block diagram showing a configuration example of the access point AP from a certain point of view.
- the access point AP includes a communication unit 11 and a processor 12.
- a processor 12 such as a CPU (Central Processing Unit) implements the processing of the access point AP described above by executing a program stored in a memory.
- CPU Central Processing Unit
- the communication unit 11 is configured to perform wireless communication with a plurality of terminals STA, specifically, uplink multiuser communication.
- the processor 12 is coupled to the communication unit 11 and is configured to control the communication unit 11 to perform the above-described access point AP processing.
- the processor 12 generates a trigger frame for allocating a predetermined resource unit RU including a terminal ID that designates a terminal STA before association among a plurality of terminals STA.
- the communication unit 11 transmits the trigger frame generated by the processor 12 to the plurality of terminals STA.
- FIG. 9 is a block diagram illustrating a configuration example of the terminal STA from a certain viewpoint.
- the terminal STA includes a communication unit 21 and a processor 22.
- a processor 22 such as a CPU implements the processing of the terminal STA described above by executing a program stored in a memory (not shown).
- the communication unit 21 is configured to perform wireless communication with the access point AP, specifically, uplink multiuser communication.
- the processor 22 is coupled to the communication unit 21 and is configured to control the communication unit 21 and perform the above-described processing of the terminal STA.
- the processor 22 is a terminal STA before association, and a temporary terminal ID designating itself is included in a trigger frame for allocating a predetermined resource unit RU received from the access point AP. It is determined whether or not.
- the communication unit 21 selects a predetermined resource unit RU based on the determination of the processor 22 and transmits uplink data to the access point AP.
- Non-transitory computer readable media include various types of tangible storage media (tangible storage medium).
- Examples of non-transitory computer-readable media are magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs (Compact Disk-Read Only Memory). , CD-R (CD-Recordable), CD-R / W (CD-ReWritable), semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (random access memory) )including.
- the program may also be supplied to the computer by various types of temporary computer-readable media.
- Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
- the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
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Abstract
Description
手順1:
端末STAは、アクセスポイントAPに対し、送信待ちの上りデータがあることを示すbuffer status(バッファステータス)を予め通知する。
アクセスポイントAPは、BSS内の複数の端末STA 1~STA nに対し、リソースユニットRUを割り当てるためのトリガフレーム(Trigger frame)を送信する(時刻t1)。ここでは、4個のリソースユニットRUを通知するものとする。アクセスポイントAPは、4個のリソースユニットRUをそれぞれ別々の端末STAに割り当てる。そのため、アクセスポイントAPは、4個のリソースユニットRUの情報と、それら4個のリソースユニットRUをそれぞれ割り当てる端末STAを指定する端末ID(Identifier)(例えば、AID(Association ID))と、をトリガフレームに含める。端末STAは、自身を指定する端末IDがトリガフレームに含まれていた場合、自身に割り当てられたリソースユニットRUを使用して、上りデータを含むUL MU PPDU(PLCP(Physical Layer Convergence Protocol) Protocol Data Unit)フレームを、アクセスポイントAPに送信する(時刻t2)。ここでは、4台の端末STA 1~STA 4が上りデータをアクセスポイントAPに送信している。
アクセスポイントAPは、BSS内の複数の端末STA 1~STA nに対し、通信成功の是非を通知するACKフレーム(Acknowledgement frame)を送信する(時刻t3)。
この問題を解決するために、アップリンク・マルチユーザ通信におけるランダムアクセス方式が検討されている(非特許文献3のclause 4.5を参照)。
手順1:
送信待ちの上りデータがある端末STAは、自身のバックオフカウンタに初期値をセットする。初期値には、0からバックオフカウンタの最大カウント値までの範囲内の値がランダムに選択される。
アクセスポイントAPは、BSS内の複数の端末STA 1~STA nに対し、リソースユニットRUを割り当てるためのランダムアクセス用トリガフレーム(TF-R:Trigger Frame for Random access)を送信する(時刻t1)。ここでは、アクセスポイントAPは、5個のリソースユニットRU 1~RU 5を通知する。また、アクセスポイントAPは、リソースユニットRU 1~RU 5を、特定の端末STAには割り当てず、ランダムアクセス可能とする。そのため、アクセスポイントAPは、リソースユニットRU 1~RU 5の情報と、リソースユニットRU 1~RU 5のそれぞれがランダムアクセス可能であることを示す特殊な端末ID(図3の例では、AID 0)と、をランダムアクセス用トリガフレームに含める。バックオフカウンタのカウント値が0でない値を持つ端末STAは、特殊な端末IDが指定されたリソースユニットRU 1~RU 5の数である5個分、所定時間ごとにカウント値をデクリメントする。その結果、カウント値が0となった端末STAは、リソースユニットRUを1つ選択し、選択したリソースユニットRUを使用して、アクセスポイントAPに対し、上りデータを含むUL MU PPDUフレームを送信する(時刻t2)。ここでは、端末STA 2が、リソースユニットRU 1を使用して上りデータを送信し、端末STA 1が、リソースユニットRU 3を使用して上りデータを送信している。
アクセスポイントAPは、BSS内の複数の端末STA 1~STA nに対し、通信成功の是非を通知するACKフレームを送信する(時刻t3)。もし、端末STA同士で、バックオフカウンタにランダムにセットした初期値が同じになる場合、時刻t2で上りデータの衝突(Collision)が発生する可能性がある。端末STAは、上りデータの衝突などの原因で正しく通信できなかった場合は、そのことをACKフレームによって判断することができる。そのため、正しく通信できなかった端末STAは、手順1に戻り、バックオフカウンタにランダムな初期値を再度セットして、上りデータの再送機会を待つ。
無線LAN基地局と、
前記無線LAN基地局との間で、アップリンク・マルチユーザ通信を行う複数の無線LAN端末と、を備え、
前記無線LAN基地局は、
前記複数の無線LAN端末のうちアソシエーション前の無線LAN端末を指定する端末ID(Identifier)を含む、所定のリソースユニットを割り当てるためのトリガフレームを、前記複数の無線LAN端末に送信し、
前記アソシエーション前の無線LAN端末は、
自身を指定する前記一時的な端末IDが前記トリガフレームに含まれている場合、前記所定のリソースユニットを選択して、前記無線LAN基地局に上りデータを送信する。
複数の無線LAN端末との間で、アップリンク・マルチユーザ通信を行う無線LAN基地局であって、
通信部と、
プロセッサと、を備え、
前記プロセッサは、
前記複数の無線LAN端末のうちアソシエーション前の無線LAN端末を指定する端末ID(Identifier)を含む、所定のリソースユニットを割り当てるためのトリガフレームを生成し、
前記通信部は、
前記トリガフレームを前記複数の無線LAN端末に送信する。
無線LAN基地局との間で、アップリンク・マルチユーザ通信を行う複数の無線LAN端末のうちの1つの無線LAN端末であって、
通信部と、
プロセッサと、を備え、
前記プロセッサは、
自身がアソシエーション前の無線LAN端末であり、かつ、前記無線LAN基地局から受信する、所定のリソースユニットを割り当てるためのトリガフレームに、自身を指定する端末ID(Identifier)が含まれているか否か判定し、
前記通信部は、
前記判定に基づき前記所定のリソースユニットを選択して、前記無線LAN基地局に上りデータを送信する。
複数の無線LAN(Local Area Network)端末との間で、アップリンク・マルチユーザ通信を行う無線LAN基地局による通信方法であって、
前記複数の無線LAN端末のうちアソシエーション前の無線LAN端末を指定する端末ID(Identifier)を含む、所定のリソースユニットを割り当てるためのトリガフレームを、前記複数の無線LAN端末に送信する。
無線LAN(Local Area Network)基地局との間で、アップリンク・マルチユーザ通信を行う複数の無線LAN端末のうちの1つの無線LAN端末による通信方法であって、
自身がアソシエーション前の無線LAN端末であり、かつ、前記無線LAN基地局から受信する、所定のリソースユニットを割り当てるためのトリガフレームに、自身を指定する端末ID(Identifier)が含まれている場合、前記所定のリソースユニットを選択して、前記無線LAN基地局に上りデータを送信する。
図4は、ある観点における(in some aspects)無線LANシステムの構成例を示す図である。ある観点における無線LANシステムは、アクセスポイントAPと、複数の端末STA 1~STA nと、を備えている。アクセスポイントAPは無線LAN基地局の一例であり、端末STA 1~STA nは無線LAN端末の一例である。以下、どの端末STA 1~STA nであるか特定しない場合は端末STAと称する。なお、図4においては、6台の端末STAを一例として示しているが、端末STAの数は2以上(すなわち、nは2以上)であればよい。アクセスポイントAP及び端末STA 1~STA nにより、BSSを構成している。また、ある観点における無線LANシステムは、上りOFDMA及び上りMU-MIMOのアップリンク・マルチユーザ通信の双方に適用可能である。
(1-1)一時的な端末IDの例1
図5は、ある観点における、アソシエーション前の端末STAを指定する一時的な端末IDの例1を説明する図である。
時刻t1において、アクセスポイントAPは、BSS内の複数の端末STA 1~STA nに対し、リソースユニットRUを通知するトリガフレームを送信する。本例1では時刻t1において、アクセスポイントAPは、5個のリソースユニットRU 1~RU 5を通知する。また、アクセスポイントAPは、リソースユニットRU 1~RU 3を、アソシエーション済みの端末STA 1~STA 3にそれぞれ割り当てるが、リソースユニットRU 4,RU 5を、特定の端末STAには割り当てず、ランダムアクセス可能と設定する。アクセスポイントAPは、リソースユニットRU 1~RU 5の情報と、リソースユニットRU 1~RU 3を割り当てる端末STA 1~STA 3を指定するAID 1~AID 3と、リソースユニットRU 4,RU 5がランダムアクセス可能であることを示す特殊値であるAID 0と、を時刻t1のトリガフレームに含める。
図6は、ある観点における、アソシエーション前の端末STAを指定する一時的な端末IDの例2を説明する図である。
時刻t1のトリガフレームの送信及び時刻t2のUL MU PPDUフレームの送信については、図5と同様である。また、図5と同様に、時刻t2のUL MU PPDUフレームの送信後、アクセスポイントAPは、ACKフレームを送信しているものとする。
図7は、ある観点における、アクセスポイントAPと複数の端末STA 1~STA nとの間の2段階のアップリンク・マルチユーザ通信の例を説明する図である。
ある観点では、アクセスポイントAPと複数の端末STA 1~STA nとの間のアップリンク・マルチユーザ通信を、第1段階と第2段階との2段階で行う。以下では、リソースユニットとして、5個のリソースユニットRU 1~RU 5があるものとして説明する。
第1段階では、アップリンク・マルチユーザ通信におけるランダムアクセスが行われる。
アクセスポイントAPは、リソースユニットRU 1~RU 3を、アソシエーション済みの端末STA 1~STA 3にそれぞれ割り当てるが、リソースユニットRU 4,RU 5を、特定の端末STAには割り当てず、ランダムアクセス可能と設定する。時刻t1においては、アクセスポイントAPは、リソースユニットRU 1~RU 5の情報と、リソースユニットRU 1~RU 3を割り当てる端末STA 1~STA 3を指定するAID 1~AID 3と、リソースユニットRU 4,RU 5がランダムアクセス可能であることを示すAID 0と、をトリガフレームに含め、BSS内の複数の端末STA 1~STA nに送信する。
時刻t2において、アクセスポイントAPからのトリガフレームを受けて、AID 1,AID 2で指定された端末STA 1,STA 2は、自身に割り当てられたリソースユニットRU 1,RU 2をそれぞれ使用して、アクセスポイントAPに対し、UL MU PPDUフレームを送信する。ここでは、端末STA 5が、AID 0で示されたリソースユニットRU 4にアクセスして、リソースユニットRU 4のアクセス権を取得している。そのため、端末STA 5は、アクセスポイントAPに対し、リソースユニットRU 4を使用して、上りデータではなく、buffer statusを含むUL MU PPDUフレームを送信する。このように、時刻t2のUL MU PPDUフレームにおいては、2個のリソースユニットRU 4,RU 5がランダムアクセス可能であり、上りデータの衝突が発生する可能性がある。そのため、通信効率は低い。しかし、buffer status自体のデータ量は小さいため、第1段階の通信に要する時間、すなわち通信効率が低い状態にある時間は短くてすむ。
第2段階では、アップリンク・マルチユーザ通信が行われる。
アクセスポイントAPは、リソースユニットRU 1,RU 2を、アソシエーション済みの端末STA 1,STA 2にそれぞれ割り当て、また、リソースユニットRU 4を、buffer statusを送信してきたアソシエーション前の端末STA 5に割り当てる。時刻t3において、アクセスポイントAPは、リソースユニットRU 1~RU 5の情報と、リソースユニットRU 1,RU 2を割り当てる端末STA 1,STA 2を指定するAID 1,AID 2と、リソースユニットRU 4を割り当てる端末STA 5を指定する上述の一時的な端末ID(例えば、UAID 5やNULL)と、をトリガフレームに含め、BSS内の複数の端末STA 1~STA nに送信する。アクセスポイントAPはリソースユニットRU 3,RU 5を、ランダムアクセス可能と設定してもよいし、特定の端末STAに割り当ててもよい。アクセスポイントAPは、リソースユニットRU 3,RU 5を、ランダムアクセス可能と設定する、または特定の端末STAに割り当てる、ことのいずれかを示す情報を、時刻t3のトリガフレームに含めるものとする。
アクセスポイントAPは、通信部11及びプロセッサ12を備えている。CPU(Central Processing Unit)などであるプロセッサ12は、メモリに格納されているプログラムを実行することによって上述のアクセスポイントAPの処理を実現する。
プロセッサ12は、通信部11と結合され、通信部11を制御して、上述のアクセスポイントAPの処理を行うよう構成されている。
例えば、プロセッサ12は、複数の端末STAのうちアソシエーション前の端末STAを指定する端末IDを含む、所定のリソースユニットRUを割り当てるためのトリガフレームを生成する。
通信部11は、プロセッサ12が生成したトリガフレームを複数の端末STAに送信する。
端末STAは、通信部21及びプロセッサ22を備えている。CPUなどであるプロセッサ22は、不図示のメモリに格納されているプログラムを実行することによって上述の端末STAの処理を実現する。
プロセッサ22は、通信部21と結合され、通信部21を制御して、上述の端末STAの処理を行うよう構成されている。
例えば、プロセッサ22は、自身がアソシエーション前の端末STAであり、かつ、自身を指定する一時的な端末IDが、アクセスポイントAPから受信する、所定のリソースユニットRUを割り当てるためのトリガフレームに含まれているか否かを判定する。
通信部21は、プロセッサ22の判定に基づき、所定のリソースユニットRUを選択して、アクセスポイントAPに上りデータを送信する。
STA,STA 1~STA n 端末
RU 1~RU 5 リソースユニット
11 通信部
12 プロセッサ
21 通信部
22 プロセッサ
Claims (9)
- 無線LAN(Local Area Network)基地局と、
前記無線LAN基地局との間で、アップリンク・マルチユーザ通信を行う複数の無線LAN端末と、を備え、
前記無線LAN基地局は、
前記複数の無線LAN端末のうちアソシエーション前の無線LAN端末を指定する端末ID(Identifier)を含む、所定のリソースユニットを割り当てるためのトリガフレームを、前記複数の無線LAN端末に送信し、
前記アソシエーション前の無線LAN端末は、
自身を指定する前記端末IDが前記トリガフレームに含まれている場合、前記所定のリソースユニットを選択して、前記無線LAN基地局に上りデータを送信する、無線LANシステム。 - 前記端末IDは、前記複数の無線LAN端末に共通する値である、請求項1に記載の無線LANシステム。
- 前記端末IDは、前記アソシエーション前の無線LAN端末のMAC(Media Access Control)アドレスに応じた値である、請求項1に記載の無線LANシステム。
- 前記無線LAN基地局は、
前記アソシエーション前の無線LAN端末の端末IDを生成し、
前記無線LAN端末は、
自身を指定する前記端末IDを生成し、当該端末IDと前記無線LAN基地局から送信される端末IDとを比較することによって、当該自身を指定する前記端末IDが前記トリガフレームに含まれているか否か判定する、請求項1または3に記載の無線LANシステム。 - 前記無線LAN基地局及び前記複数の無線LAN端末は、
前記アップリンク・マルチユーザ通信を第1段階及び第2段階の2段階で行い、
前記第1段階の通信において、
前記無線LAN基地局は、
前記所定のリソースユニットがランダムアクセス可能であることを示す値を含む、前記トリガフレームを、前記複数の無線LAN端末に送信し、
前記アソシエーション前の無線LAN端末は、
前記値が前記トリガフレームに含まれている場合、前記所定のリソースユニットを使用して、送信待ちの上りデータがあることを示すバッファステータスを前記無線LAN基地局に送信し、
前記第2段階の通信において、
前記無線LAN基地局は、
前記第1段階の通信で、前記アソシエーション前の無線LAN端末が、前記所定のリソースユニットを使用して、前記バッファステータスを送信する場合、前記アソシエーション前の無線LAN端末に前記所定のリソースユニットを割り当て、前記アソシエーション前の無線LAN端末を指定する前記端末IDを、前記トリガフレームに含めて、前記複数の無線LAN端末に送信し、
前記アソシエーション前の無線LAN端末は、
自身を指定する前記端末IDが前記トリガフレームに含まれている場合、前記所定のリソースユニットを選択して、前記無線LAN基地局に上りデータを送信する、請求項1から3のいずれか1項に記載の無線LANシステム。 - 複数の無線LAN(Local Area Network)端末との間で、アップリンク・マルチユーザ通信を行う無線LAN基地局であって、
通信部と、
プロセッサと、を備え、
前記プロセッサは、
前記複数の無線LAN端末のうちアソシエーション前の無線LAN端末を指定する端末ID(Identifier)を含む、所定のリソースユニットを割り当てるためのトリガフレームを生成し、
前記通信部は、
前記トリガフレームを前記複数の無線LAN端末に送信する、無線LAN基地局。 - 無線LAN(Local Area Network)基地局との間で、アップリンク・マルチユーザ通信を行う複数の無線LAN端末のうちの1つの無線LAN端末であって、
通信部と、
プロセッサと、を備え、
前記プロセッサは、
自身がアソシエーション前の無線LAN端末であり、かつ、前記無線LAN基地局から受信する、所定のリソースユニットを割り当てるためのトリガフレームに、自身を指定する端末ID(Identifier)が含まれているか否か判定し、
前記通信部は、
前記判定に基づき前記所定のリソースユニットを選択して、前記無線LAN基地局に上りデータを送信する、無線LAN端末。 - 複数の無線LAN(Local Area Network)端末との間で、アップリンク・マルチユーザ通信を行う無線LAN基地局による通信方法であって、
前記複数の無線LAN端末のうちアソシエーション前の無線LAN端末を指定する端末ID(Identifier)を含む、所定のリソースユニットを割り当てるためのトリガフレームを、前記複数の無線LAN端末に送信する、通信方法。 - 無線LAN(Local Area Network)基地局との間で、アップリンク・マルチユーザ通信を行う複数の無線LAN端末のうちの1つの無線LAN端末による通信方法であって、
自身がアソシエーション前の無線LAN端末であり、かつ、前記無線LAN基地局から受信する、所定のリソースユニットを割り当てるためのトリガフレームに、自身を指定する端末ID(Identifier)が含まれている場合、前記所定のリソースユニットを選択して、前記無線LAN基地局に上りデータを送信する、通信方法。
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CN108781445A (zh) | 2018-11-09 |
US11832313B2 (en) | 2023-11-28 |
EP4351269A2 (en) | 2024-04-10 |
US20190053275A1 (en) | 2019-02-14 |
EP3429289A4 (en) | 2019-09-25 |
CN108781445B (zh) | 2023-06-06 |
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