WO2015196523A1 - 资源指示的处理方法、处理装置、接入点和站点 - Google Patents
资源指示的处理方法、处理装置、接入点和站点 Download PDFInfo
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- WO2015196523A1 WO2015196523A1 PCT/CN2014/082437 CN2014082437W WO2015196523A1 WO 2015196523 A1 WO2015196523 A1 WO 2015196523A1 CN 2014082437 W CN2014082437 W CN 2014082437W WO 2015196523 A1 WO2015196523 A1 WO 2015196523A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
- H04W72/23—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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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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
- Resource indication processing method processing device, access point and site
- the present invention relates to the field of wireless communication technologies and, more particularly, to a method, an access point, and a station for transmitting information. Background technique
- WLAN Wireless Local Area Network
- OFDM Orthogonal Frequency Division Multiplexing
- 0FDMA technology supports multiple nodes to simultaneously send and receive data.
- the resource allocation is performed based on the RB or the RB group; different channel resources are allocated to different STAs at the same time, so that multiple STAs access the channel efficiently, thereby improving channel utilization.
- Embodiments of the present invention provide a method, an access point, and a station for transmitting information, which can efficiently indicate time-frequency resources to a station.
- a method for processing a resource indication is provided, which is applied to a WLAN that uses the OFDM technology to send or receive a frame that includes a resource indication field, where the resource indication field includes an identifier of the user, and an identifier corresponding to the user.
- Resource block information and modulation and coding mode MCS provides a resource indication processing device, which is applied to a wireless local area network (OFDM) using OFDM technology, and includes a processing unit for transmitting or receiving a frame including a resource indication field.
- the resource indication field includes an identifier of the user, and resource block information and modulation and coding mode MCS information corresponding to the identifier of the user.
- an access point is further provided, where the access point includes the processing device of the resource indication as described above, and the processor in the processing device of the resource indication is specifically configured to send the included resource Indicates the frame of the field.
- the site includes a processing device of the resource indication as described above, and the processor in the processing device of the resource indication is specifically configured to receive the frame including the resource indication field.
- time-frequency resources are efficiently indicated to the station, and the station can communicate with the indicated resources.
- FIG. 1A is a schematic diagram of a system architecture applicable to an embodiment of the present invention.
- FIG. 1B is a schematic flowchart of an applicable embodiment of the present invention.
- FIG. 2 is a schematic diagram of a frame for resource indication in accordance with an embodiment of the present invention.
- FIG. 3 is a schematic diagram of a frame for resource indication in accordance with an embodiment of the present invention.
- 4 is a schematic diagram of a frame for resource indication in accordance with an embodiment of the present invention.
- FIG. 5 is a schematic diagram of a frame for resource indication according to another embodiment of the present invention.
- FIG. 6 is a schematic diagram of a frame for resource indication in accordance with an embodiment of the present invention.
- FIG. 7 is a schematic diagram of a manner of resource indication according to an embodiment of the present invention.
- FIG. 8 is a schematic diagram of a partition of resource indication according to another embodiment of the present invention.
- FIGS 9A-9C are schematic diagrams of resource indication types, respectively, in accordance with one embodiment of the present invention.
- FIG. 10 is a block diagram of an access point in accordance with an embodiment of the present invention.
- FIG 11 is a block diagram of a station in accordance with an embodiment of the present invention.
- 12a-12b are respectively schematic diagrams of the frame structure of an embodiment.
- Figure 13 is a schematic diagram of the operation of a system.
- Figures 14a-14i are schematic illustrations of several frame structures, respectively.
- An access point can also be called a wireless access point or bridge or hotspot, which can access a server or a communication network.
- a station also referred to as a user, can be a wireless sensor, a wireless communication terminal, or a mobile terminal, such as a mobile phone (or "cellular" telephone) that supports WiFi communication and a computer with wireless communication capabilities.
- a mobile terminal such as a mobile phone (or "cellular" telephone) that supports WiFi communication and a computer with wireless communication capabilities.
- it may be a portable, pocket, handheld, computer built-in, wearable, or in-vehicle wireless communication device that supports WiFi communication, and exchanges communication data such as voice and data with the wireless access network.
- FIG. 1a is a simplified schematic diagram of a WLAN system to which an embodiment of the present invention is applied.
- the system of Figure 1 includes one or more access points AP 101 and one or more stations STA 102.
- Wireless communication is performed between the access point 101 and the station 102 using the 0FDMA technology, where the access point 101 sends
- the data frame contains indication information for the time-frequency resources of the station 102.
- an embodiment of the present invention provides a method for resource indication, which is applied to a wireless local area network (OFDM) using an OFDM technology.
- the access point sends a frame including a resource indication field to the station, where the resource indication field is included.
- the station receives the frame including the resource indication field, parsing the resource indication field to obtain resource block information allocated by the station, and modulating coding mode information and spatial stream number information, using the resource block information and modulation coding
- the mode information and the spatial stream number information are communicated.
- the resource indication is based on the user.
- the resource is a time-frequency resource in the WLAN, and in particular, an unauthorized time-frequency resource.
- the STA obtains the resource block information, and then uses the corresponding resource block to communicate; the STA obtains the MCS information, that is, obtains the adjustment coding mode corresponding to the sending and receiving data, and then uses the MCS to transmit and receive;
- the spatial stream number information may be transmitted by using the corresponding spatial stream number when transmitting; after the STA acquires the TPC information, the adjusted transmission power may be used for transmission.
- the following describes in detail several frames for resource indication in the above communication system, and based on these frames, the foregoing method for indicating resource information to the site is further implemented. Specifically, the method is performed by the access point to send a frame that uses the following frame to the station, and the station receives the frames and parses the resources that can be used by the station, and subsequently uses the resources to communicate.
- an embodiment of the present invention proposes a frame applied to a wireless local area network for resource indication.
- the data frame includes a control field (for example, called Frame Control, or SIG-A), where the control field contains configuration information of "resource indication” (for example, called MAP Config); the data frame also includes A "Resource Indication” field (eg, DL MAP, UL MAP, UL ⁇ DL MAP, or SIG-B field in FIG. 2) that contains resource indications for time-frequency resources of one or more stations 102.
- the control field is optionally The BSSID information of the access point 101 can be included.
- the configuration information of the "resource indication” may include “resource indication” configuration information in a plurality of uplink and downlink subframes (DL/UL subframe).
- the configuration information of the "resource indication” may include the time-frequency resource location of the "resource indication", the length of the "resource indication”, or the Modulation and Coding Scheme (MCS) information of the "resource indication”.
- MCS Modulation and Coding Scheme
- the time-frequency resource location of the "resource indication” may include: a resource indication field
- the configuration information of the “resource indication” may further include information such as an uplink “UL MAP indicator” or a bandwidth, where the UL MAP indicator is used to indicate that the resource indication field is a user indicating an uplink; Informing the STA of the bandwidth information of the AP.
- information such as an uplink “UL MAP indicator” or a bandwidth, where the UL MAP indicator is used to indicate that the resource indication field is a user indicating an uplink; Informing the STA of the bandwidth information of the AP.
- control field + "resource indication” field given in the foregoing FIG. 2 - FIG. 3 can also be replaced with other possible frames, for example, does not contain a control field, and only contains a "resource indication” field.
- FIG. 2 - 8 a simplified schematic of a plurality of "Resource Indication” fields is also shown.
- the resource indication fields in the foregoing various frames may be indicated based on time-frequency resources, that is, indicating that the time-frequency resources can be used by the STA or the STAs (not shown in the figure), specifically, available in the system.
- the time-frequency resource used by the user is divided into a number of time-frequency resource blocks, each of which is assigned or matched with a user ID (including the group ID of the MU-MIM0 user), and a corresponding modulation and coding mode MCS. It may also be based on the user's indication, that is, which time-frequency resources can be used by one or more users (ie, STAs) (for example, as shown in FIGS. 5-8).
- an uplink resource indication (UL MAP) may be placed in a downlink subframe close to the uplink subframe.
- the MAP information (indicating the time-frequency resources used by the user) obtained by the AP according to the scheduling of the STA channel is more timely and suitable for the subsequent uplink subframe of the STA.
- the uplink resource information is more reliable, and the decoding complexity can also be reduced.
- a resource indication field of all STAs of the current subframe is included or carried, for example, a downlink resource indication.
- the DL MAP or, the uplink and downlink resources indicate the UL/DL MAP.
- the UL MAP information may be mixed with the DL MAP information into DL/UL MAP information, and the indication is performed in the downlink subframe.
- the resource indication field includes resource block information (resource block location) in which the scheduled STA within the subframe transmits data (DL or UL) within the subframe.
- the “resource indication” information may further include MCS information that the STA sends data on the allocated one or more resource blocks.
- 5-8 are simple schematic diagrams of some frames based on resource indication by the user. Referring to FIG.
- the "Resource Indication" field performs a resource indication field for each STA, and N is a natural number.
- the resource indication field of each STA includes an identifier of the STA, resource block information, a modulation and coding mode MCS, and the like.
- the ID of the STA is, for example, Associated Identification (AID/Partial AID).
- spatial stream number information may also be included, where the spatial stream refers to multiple antennas independently transmitting different streams composed of separately encoded signals in parallel; the number of spatial streams refers to the number of different streams.
- power control, retransmission indication, or new packet indication may also be included.
- the resource indication field may indicate a resource indication of a user group using Multi-User Multiple-Input Multiple-Output (MU-MIMO), in addition to the resource indication field of a single STA. For the resource indication of the MU-MIM0 user group, there are two cases.
- MU-MIMO Multi-User Multiple-Input Multiple-Output
- the resource indication field does not include the MU-MIM0 user group identifier (Group ID), that is, only the user in a single user unit. Identification ID and resource block information corresponding to the user identification ID, modulation and coding mode MCS, etc. A plurality of users in a group of users employing multi-user MIMO and MIMO-MIMO technologies are respectively indicated to have the same resource block. As shown in FIG. 5, each user parses out its own resource block information. For the users in the MU-MIM0 user group, the parsed resource blocks have the same part.
- the resource indication field includes the MU-MIM0 user group identifier (Group ID), resource block information, modulation and coding mode MCS, and the like. As shown in FIG.
- the resource indication fields of different users are sequentially carried in the "resource indication" field, and the order may be random, and the system efficiency may be increased according to a certain order.
- the resource indication of the MU user can be placed in the position in the front resource indication field, so that more STAs can decode their own time-frequency resources earlier, which can improve the efficiency of the overall system resources.
- the MU user's resource indication is placed in the front position of the resource indication field as a whole, for example, the time slot is forward. It does not mean that all MU users' resource indications must be completed before indicating the SU user's resources.
- the resource block information mentioned in the foregoing various frames may be indicated in various manners, such as a Bitmap indication manner, or an indication manner of an offset.
- the Bitmap indication mode is to indicate the time-frequency resources to be used by using the bit position. For example, (T31 RB resources, a downlink STA1 is allocated (T15 RBs, then the Bitmap indication mode is 11111111111111110000000000000000. Where, the offset is adopted)
- the indication of the quantity is to indicate the time-frequency resource to be used by indicating the starting point and the offset. Referring to FIG. 7, for example, 0 to 31 RB resources, and a downlink STA2 allocates 16 to 23 RBs, then the offset
- the indication mode indicates the starting point and the offset: 10000 00111.
- the indication manner of the resource block information may be an indication manner based on the variable length resource block.
- the indication manner based on the variable length resource block is to set a plurality of indication manners.
- a resource block (RB) unit of different subcarrier numbers allocates variable length RB units for different users, which is different from the number of fixed subcarriers in the resource block (RB) unit in the Bitmap and offset indication methods.
- RB1 includes 14 sub- Wave
- RB2 comprising 26 subcarriers
- RB3 comprise 56 subcarriers
- 114 comprising for An OFDMA system with available subcarriers, four variable length RB units RBI, RB2, RB3 and RB4 are set, RBI includes 14 subcarriers, RB2 includes 26 subcarriers, RB3 includes 56 subcarriers, RB4 includes 114 subcarriers, and contains 242 0 DMA system with available subcarriers, 5 RB variable length units RB1, RB2, RB3, RB4 and RB5 are set, RBI includes 14 subcarriers, RB2 includes 26 subcarriers, RB3 includes 56 subcarriers, RB4 includes 114 subcarriers, RB5 Includes 242 subcarriers.
- the starting point location and the RB unit identity or other methods may be used to indicate that the resource is allocated.
- the identifier of RB1 ⁇ 5 is 000/001/010/011/100; the starting position can be defined according to the identifier of the subcarrier, or the RB unit according to the minimum number of subcarriers. To define (such as 14 RBs). It is assumed that RB3 (56 subcarriers) is allocated to STA3, and the starting point is the 43rd subcarrier. Then, the starting point is defined according to the subcarrier identifier.
- the resource indication mode of the STA is: 00101010 010; the starting point is defined according to the unit of the minimum RB number, and the indication manner of the STA is: 0100 010.
- the OFDM system can be used for the single-user SU and the multi-user MU MIM0 scenario.
- the WLAN system can efficiently perform the STA resource allocation indication.
- the resource indication field may also be divided into two or more regions or portions, as shown in FIG. 8.
- Each STA divides the STA's MAP information into a certain area for a certain criterion.
- the criterion of the sub-area may include, but is not limited to, one of the following: based on the STA ID sub-area: For example, the STA ID and the number of the area partition are used to perform a remainder operation, and the remainder is determined according to the remainder. Area block number.
- Sub-area based on QoS requirements For example, an STA with a high-priority service has its resource indication field placed in the top area block.
- the uplink and downlink service type sub-area For example, the resource indication field of the STA of the downlink service is placed in the first area, and the resource indication field of the STA of the uplink service is placed in the second area or the like.
- the foregoing criteria for each sub-area can be performed without any combination of logic, and details are not described herein again.
- the resource indication field of the site is read directly from the corresponding region of the site according to one of the aforementioned criteria for various partitions.
- the STAs placed behind the resource indications can find their own resource indication fields without reading all the resource indication contents (the STA indicates the resource indication fields in the downlink subframe and the uplink subframe). ). In this way, the speed at which the STA reads the resource indication field can be accelerated.
- the resource indication field may further include: type information of the resource indication.
- the resource indication field may also display or implicitly include length information of the resource indication (refer to FIG. 9A-C). Different types of resource indication fields are defined in Table 1.
- Table 1 provides several different types of resource indication fields.
- the type indicated by "000” is DL scheduling with single stream, and the type indicated by "001” is DL scheduling in spatial scheduling. Multiplexing
- the type indicated by "010” is downlink MU-MIMO scheduling (DLMU-MIM0 scheduling)
- the type indicated by "011” is uplink scheduling (UL scheduling)
- the type indicated by "100” is uplink MU-MIM0 scheduling (UL) Scheduling).
- Different types of resource indication fields can have different lengths, resource allocations, and configurations (see Figures 9A-9C).
- the STA can learn the format of the resource indication field by decoding the resource ID (type ID) information; optionally, the length can also be known. In this way, the STA reads the MAP type, knows the length to read the MAP information, and avoids searching with various lengths of MAP, which can speed up the reading of the MAP.
- the resource indication field may include: resource block (RB) information, MCS information, SID/GID information; optionally, may further include a resource indication type (type), and a spatial flow number information (number of spatial Streams, Jane NSS, New Data indication, HARQ process number, redundancy version information, or one or any combination of power control information TPC.
- the foregoing optional information may not be included in the resource indication field, or may be multiplexed with the information in the resource indication field in some manner, for example,
- the SID/GID information can be scrambled with the check digit.
- the resource indication type (type) may be formatted to specify one or a combination of the foregoing information, such that the resource indication field occupies less communication resources.
- FIG. 9A is a simple schematic diagram of a resource indication field of a type of single-stream downlink scheduling
- FIG. 9B is a simple schematic diagram of a resource indication field of a type of space division multiplexing downlink scheduling
- FIG. 9C is a resource of the uplink scheduling type.
- a simple diagram of the indication field is a simple schematic diagram of a resource indication field of a type of single-stream downlink scheduling
- FIG. 9B is a simple schematic diagram of a resource indication field of a type of space division multiplexing downlink scheduling
- FIG. 9C is a resource of the uplink scheduling type.
- the access point sends a downlink subframe that uses the foregoing frame; the STA scheduled by the downlink subframe receives the frames, and decodes and finds its own resources included in the subframe or subsequent subframes. Indicates a field and communicates on the resource block indicated by the resource indication field.
- the STA scheduled by the downlink subframe can decode the resource block information used for transmitting the downlink data, and the MCS information for transmitting the downlink data, etc.; in the subsequent downlink subframe (DL subframe) In the corresponding resource block (ie the location of the indicated resource), utilized
- the MCS information is used for downlink data transmission.
- the STA scheduled by the downlink subframe can decode the resource block information used when transmitting the uplink data, and the MCS information for transmitting the uplink data, etc.; in the subsequent uplink subframe (UL subframe) On the corresponding resource block (ie, the location of the indicated resource), the MCS information is used for uplink data transmission.
- another embodiment provides a resource indication processing device (not shown), which is applied to a wireless local area network (OFDM) using OFDM technology, and includes a processing unit, configured to send or receive a frame including a resource indication field, the resource The indication field includes an identifier of the user, and resource block information and modulation and coding mode MCS information corresponding to the identifier of the user.
- a resource indication processing device (not shown), which is applied to a wireless local area network (OFDM) using OFDM technology, and includes a processing unit, configured to send or receive a frame including a resource indication field, the resource The indication field includes an identifier of the user, and resource block information and modulation and coding mode MCS information corresponding to the identifier of the user.
- the processing unit may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and may implement or perform the embodiments of the present invention.
- a general purpose processor can be a microprocessor or any conventional processor or the like.
- the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. It is easy to understand that the processing device of the foregoing resource indication may be located at an access point when specifically transmitting the frame including the resource indication field, and may be located at the site when specifically receiving the frame including the resource indication field.
- FIG. 10 is a block diagram of an access point in accordance with another embodiment of the present invention.
- the access point of Figure 10 includes an interface 101, a processing unit 102, and a memory 103.
- Processing unit 102 controls the operation of access point 100.
- Memory 103 can include read only memory and random access memory and provides instructions and data to processing unit 102.
- a portion of the memory 103 may also include non-volatile line random access memory (NVRAM).
- NVRAM non-volatile line random access memory
- the various components of access point 100 are coupled together by a bus system 109, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 109 in the figure.
- the method for transmitting the foregoing various frames disclosed in the foregoing embodiments of the present invention may be applied to the processing unit 102 or implemented by the processing unit 102.
- the steps of the above method can be This is done by an integrated logic circuit of hardware in the processing unit 102 or an instruction in the form of software.
- the processing unit 102 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, which can be implemented or executed in an embodiment of the invention.
- a general purpose processor can be a microprocessor or any conventional processor or the like.
- FIG. 11 is a block diagram of a station in accordance with another embodiment of the present invention.
- the access point of FIG. 11 includes an interface 111, a processing unit 112, and a memory 113.
- Processing unit 112 controls the operation of site 110.
- Memory 113 can include read only memory and random access memory and provides instructions and data to processing unit 112. A portion of the memory 113 may also include non-volatile line random access memory (NVRAM).
- NVRAM non-volatile line random access memory
- the various components of the site 110 are coupled together by a bus system 119, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 119 in the figure.
- the method for receiving the foregoing various frames disclosed in the foregoing embodiments of the present invention may be applied to the processing unit 112 or implemented by the processing unit 112.
- each step of the above method may be completed by an integrated logic circuit of hardware in the processing unit 112 or an instruction in the form of software.
- the processing unit 112 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can be implemented or executed in an embodiment of the invention.
- a general purpose processor can be a microprocessor or any conventional processor or the like.
- the steps of the method disclosed in the embodiments of the present invention may be directly implemented as hardware processor execution, or in a processor.
- the hardware and software module combination is completed.
- the software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
- the storage medium is located in the memory 113, and the processing unit 112 reads the information in the memory 113 and combines the hardware to complete the steps of the above method.
- the memory 113 stores instructions that cause the processing unit 112 to perform the following operations: The method on the site side in each embodiment.
- FIG. 12a is a schematic diagram showing a frame structure of a PLCP Protocol Data Unit (PPDU) transmitted by an AP according to an embodiment of the present invention
- FIG. 12b shows another embodiment of the present invention.
- a frame format scheme for efficiently indicating multi-user control signaling and combining contention and scheduling access is proposed.
- a radio frame comprising a Legacy Preamble portion, a 802.
- l lax frame control field Control Field
- DL subframes downlink transmission subframes
- UL subframes uplink transmission subframes
- the minimum processing time (SIFS) in the WiFi system is required between the downlink transmission subframe (DL subframe) and the uplink transmission subframe (UL subframe).
- the Legacy Preamble portion can also be added before the uplink subframe (UL subframe), as shown in Fig. 12b.
- l lax includes HE-SIG1 (High Efficiency - Signal Field) indicating the uplink and downlink subframes, and the high-efficiency WLAN signaling field common control information field (HE-SIG1) and the indication uplink/downlink Broadcast/Multicast control subframe of the multi-user scheduling information (UL/DL Scheduling Information) in the frame.
- HE_SIG1 indicates the public information of STA-common (such as system bandwidth, subsequent DL/UL subframe) Number, start and length information, etc., and HE-SIG2 transmission control information if necessary), and STA-spec ific control information is included in HE-SIG2.
- the HE-LTF can support high-order modulation HE-SIG2 to improve the transmission efficiency of multi-user scheduling signaling.
- the downlink transmission subframe (DL subframe) and the uplink transmission subframe (UL subframe) include STA-specif ic HE-preamble and STA-specific data portions. This will be specifically described in the examples.
- the public control signaling field includes at least an STA-common HE-preamble (a high-efficiency wireless LAN preamble shared by multiple users), and may further include a HE-SIG2 field.
- the STA-common HE-preamble field includes scheduling information of at least two STAs, and the scheduling information includes at least uplink control information for indicating that the AP allows at least two STAs to send uplink data.
- the L-preamble shown in Figures 12a, 12b is a conventional WLAN physical layer header, including a legacy short training legacy short training field L-STF, a legacy long training field L-LTF, and a legacy signaling field L-SIG.
- the HE-SIG1 field is used to store related information of the DL subframe and/or the UL subframe and related information of the STA-common HE-preamble, where the related information of the DL subframe includes a transmission bandwidth for indicating the DL subframe, and the DL.
- the information about the UL subframe includes a transmission bandwidth for indicating the UL subframe, the number of UL subframes, the start time and length information, and the like.
- the information related to the STA-common HE-preamble refers to a parameter of the first detection reference information used to detect the scheduling information, for example, a specified channel, a sequence length, and the like.
- the STA-common HE-preamble includes: STA-common HE-STF/LTF field and HE-SIG2 field; the content of the STA-common HE-STF/LTF field is used to detect the content of the HE-SIG2 field.
- the STA-common HE-STF field is used to store the AGC receiving HE-SIG2 on the designated channel; the STA-common HE-LTF field is used to store the channel estimate indicating HE-SIG2.
- the HE-SIG2 field is used to store scheduling control information of the STA (scheduling information.
- the uplink control information in the scheduling information may include: an allocated channel resource, a precoding vector, a data length, and a spatial stream.
- the HE-SIG2 field may include both the uplink control information and downlink control information, where the downlink control information is used to indicate that the AP allows at least two STAs to receive downlink data.
- the downlink control information includes at least resource information allocated by the AP, such as the allocated channel resource and the spatial stream, to the STA.
- the downlink control information may be stored in two parts in the HE-SIG2 field and the HE-SIG3 field, respectively.
- the first downlink control information is stored in the HE-SIG2 field, where the first downlink control information includes channel resource information allocated by the AP for the STA, for example, sub-channel information and spatial stream; and the second downlink control is stored in the HE-SIG3 field.
- Information, the second downlink control information includes a transmission parameter such as an encoding format and a data length.
- the HE-SIG3 field is sent in the DL subframe.
- the DL subframe field in each embodiment may include a STA-specific HE-preamble (STA's proprietary high-efficiency wireless LAN preamble), and DL SU-MIMO data (single-user downlink data) or DL MU-MIMO data (multiple User downlink data), where DL MU-MIM0 data is downlink data that the AP sends to multiple STAs located in different directions by using the same time-frequency resource.
- the DL subframe field of an embodiment may include a STA-specific HE-STF field, a STA-specific HE-LTF field, and an HE-SIG3 field.
- the content of the STA-specific HE-STF field is used to indicate the AGC that sends the downlink data
- the content of the STA-specific HE-LTF field is used to indicate the channel estimation of the STA
- the content of the HE-SIG3 field is used to indicate the sending of the data.
- the UL subframe field in each embodiment may include UL SU-MIMO data (single-user uplink data) or DL MU-MIMO data (multi-user uplink data), where the UL MU-MIM0 data is that the AP uses the same time-frequency resource.
- the HE-SIG3 field may be included, and the contents of the HE-SIG3 field are used to indicate transmission parameters of the data, for example, MCS and data length, and the like.
- the transmitting end includes a processing unit and an interface, wherein the interface specifically includes a receiver Rx l and a transmitter Tx l; the processing unit includes a controller 1, a demodulator 1 and a modulator 1, the working principle of which is described below.
- the L-preamble, the HE-SIG1, and the STA-common HE-preambleo are transmitted on the entire channel designated by the AP, and the content of the DL subframe of each STA is correspondingly transmitted on the sub-channel corresponding to each STA, thereby realizing multi-user identity.
- Time-sharing spectrum resources or space resources do not interfere with each other, thereby improving the utilization of spectrum resources and space resources.
- the processing procedure or principle of the receiving end (STA) receiving the above PPDU frame format is shown.
- the receiving end (STA) includes a processing unit and an interface, wherein the interface specifically includes a receiver Rx2 and a transmitter Tx2; the processing unit includes a controller 2, a demodulator 2 and a modulator 2, the operation of which is described below. Specifically, after receiving the PPDU frame format, the receiving end (STA) first performs initial time synchronization, CF0 (frequency offset) estimation, and sending on the channel designated by the AP according to the content of the L-STF field in the L-preamble.
- CF0 frequency offset
- AGC Automatic Gain Control estimation of the signal; according to the content of the L-LTF field, the time-peer and CF0 estimation are performed on the designated channel, and the channel estimation of the specified channel is obtained at the same time; L- can be detected according to the obtained channel estimation
- the content of the SIG field is detected according to the channel estimation obtained by the L-LTF field, and the parameters of the UL frame and the DL subf into the e and the parameters of the STA-common HE_preamble, for example, the transmission bandwidth and the sequence length, are obtained.
- the STA further determines which fields in the WLAN physical layer frame are DL subframe according to the parameters of the DL subframe.
- the HE-SIG1 field may also include the transmission of HE-SIG2.
- the parameter for example, the MCS (Modulation and Coding Scheme) used by the HE-SIG2, and the ID of the STA indicated by the HE-SIG2, where the ID may be an AID (Association Identifier).
- the ID may be a PAID (Partial AID), and the PAID is an association identifier that combines the AID and the BSSID of the serving AP, and/or the ID of the user group.
- the receiving end detects the content of the HE-SIG 2 based on the transmission parameter of the HE-SIG 2 included in the HE-SIG 1.
- the AP can send the content of the HE-SIG1 field in a multicast manner.
- the STA detects that the HE-SIG1 field does not contain its own identification information, the STA does not continue to detect the subsequent frame structure, which saves the detection time of the STA.
- the STA-common HE-STF/LTF field Detecting the content of the STA-common HE-STF/LTF field according to the parameter obtained from the content of the HE-SIG1 field; then, obtaining the AGC of the HE-SIG2 field on the specified channel according to the content of the STA-common HE-STF field, The channel estimation of the HE-SIG2 field on the designated channel is obtained according to the content of the STA-common HE-LTF field, and then the content of the HE-SIG2 field is detected according to the channel estimation. If the STA detects that the HE-SIG2 field contains its own DL SI (downlink Scheduling Information), that is, the downlink control information of the STA.
- DL SI downlink Scheduling Information
- the STA obtains the content of the STA-specific HE-STF/LTF field according to the content of the detected HE-SIG2 field. Then, according to the content of the STA-specific HE-STF field, the AGC that the STA receives the downlink data is obtained.
- the channel estimation of the specified channel is obtained according to the content of the STA-specific HE-LTF field, and the content of the HE-SIG3 field is detected by using the channel estimation, and the transmission parameters of the downlink data, for example, the MCS and the data length, and the like are obtained.
- the STA finds the start time and length of the DL subframe in which the downlink data of its own is located based on the information about the DL subframe detected from the HE-SIG1 field and the above parameters (AGC, channel estimation, transmission parameters).
- the STA detects that the HE-SIG2 field contains its own UL SI (downlink Scheduling Information), that is, the uplink control information of the STA.
- the STA finds the start time of the UL subframe where the uplink data is transmitted according to the uplink control information in the detected HE-SIG2 field and the related information of the UL subframe in the HE-SIG1 field. Between and length.
- the STA-specific HE-pre amble in this embodiment may include a STA-specific HE-STF field, an HE-LTF field, and a STA-specific HE-SIG3 field.
- the STA detects that the HE-SIG2 includes its own UL SI
- the STA sets the STA-specific HE-preamble parameter according to the UL SI, and generates the STA-specif ic HE-STF field and the STA- according to the parameters of the STA-specific HE-preamble.
- the content of the specific HE-LTF field is not limited to the STA-specific HE-STF field.
- the STA itself has the capability of adjusting the transmission parameters when transmitting the uplink data, for example, adjusting the MCS and the data length based on the downlink received scheduling information and the channel estimation to obtain an uplink transmission parameter, and storing the uplink transmission parameter in the STA-specific HE In the HE-SIG3 field after the -STF and STA-specif ic HE-LTF, the content of the HE-SIG3 is transmitted to the AP on the transport channel corresponding to the STA.
- the UL data may include UL SU Data (single-user uplink data) or UL MU data (multi-user uplink data), where UL MU data is uplink data that multiple STAs transmit to the AP in different directions by using the same time-frequency resource.
- UL SU Data single-user uplink data
- UL MU data multi-user uplink data
- each STA After each STA transmits the content of its corresponding HE-SIG3 field, it transmits its own uplink data on its respective subchannel.
- the AP detects the content of the STA-specific HE-STF field and the STA-specific HE-LTF field in the uplink subframe sent by the STA, and obtains the AGC of the uplink data of the STA by using the content of the STA-specific HE-STF field;
- the content of the STA-specific HE-LTF field is obtained by the channel estimation of the STA;
- the content of the HE-SIG3 field is detected according to the channel estimation, and uplink transmission parameters, such as MCS and data length, etc., are obtained.
- uplink transmission parameters such as MCS and data length, etc.
- the scheduling information SI of the STA in the DL subframe is included in the HE-SIG2 and Scheduling information SI of the STA in the UL subframe. All stations (users) or a group of users indicated in HE-SIG1 need to detect HE-SIG2 information. If the station detects its own control information in the DL-SI, it needs to receive data according to the scheduling information indicated by the AP in the subsequent DL subframe.
- the control information is detected in the UL-SI, it needs to be in the subsequent UL subframe.
- the data is received according to the scheduling information indicated by the AP.
- the AP does not need to additionally transmit the SIG field of the DL SI, and the UL subframe sent by the STA does not need to include the SIG field for notifying the UL SI, that is, the frame structure is used for unified control of the uplink by the AP.
- the scene transmitted by the user Specifically, for the working principle shown in FIG. 13, when the frame structure of FIG.
- the scheduling information SI of the STA in the DL subframe and the scheduling information SI of the STA in the UL subframe are included in the HE-SIG2. All users or a group of users indicated in HE-SIG1 need to detect the information of HE-SIG2. If the control information is detected in the DL-SI, the data needs to be received in the subsequent DL subframe according to the scheduling information indicated by the AP. If the control information is detected in the UL-SI, it needs to be followed in the subsequent UL subframe. The scheduling information indicated by the AP receives data.
- the UL subframe includes a SIG field (HE-SIG3) for the STA to inform or inform the AP of the UL SI.
- the STA can also adjust the scheduling parameters according to the actual channel conditions when transmitting the data. For example, if there is sudden interference, the MCS can be appropriately reduced to meet the PER requirement when the test data is guaranteed. More specifically, for the working principle shown in FIG. 13, when the frame shown in FIG. 14b is used, there is no HE-SIG3 part transmission in the STA-specific HE-preamble of the downlink AP transmitting end, and the downlink STA receiving end does not.
- the STA control unit has a scheduling parameter adjustment function, and the HE-SIG3 needs to be sent in the STA-specific HE-preamble, and the uplink AP receiving end corresponds to the HE-SIG3 part in the STA-specif ic HE-preamble. receive.
- the scheduling information SI of the STA in the UL subframe and the scheduling information SI of the STA in the partial DL subframe are included in the HE-SIG2. All users or a group of users indicated in HE-SIG1 need to detect the information of HE-SIG2.
- the data needs to be received in the subsequent DL subframe according to the scheduling information indicated by the AP; if the control information is detected in the UL-SI, it needs to be followed in the subsequent UL subframe.
- the scheduling information indicated by the AP receives data.
- the difference from FIG. 14a is that the DL STA specified in HE-SIG2 continues to detect the remaining DL SI in the SIG field (HE-SIG3) in the DL subframe, which can reduce the overhead of the common control information field (HE-SIG2). .
- the AP indicates the ID of the DL STA and the location information of the allocated resource in the HE-SIG2, and specifically transmits the STA-specific control information such as the MCS, the data length, the spatial stream, and the like in the HE-SIG3.
- HE-SIG3 can use the LTF of frequency taking and spatial multiplexing to obtain control information of different users/flows, and improve the efficiency of signaling transmission. More specifically, for the working principle described in FIG. 13, the frame of FIG. 14c is used, and the STA-specific HE-preamble of the downlink AP transmitting end has the HE-SIG3 part transmission, and the downlink STA receiving end is the STA-specific HE.
- the uplink STA sender, the STA Control Unit module has no scheduling parameter adjustment function, and there is no HE-SIG3 part of the STA-specif ic HE-preamble, and the uplink AP receiver does not.
- the AP transmits the partial SI of the STA in the DL subframe and the SI of the STA in the UL subframe in the HE-SIG2 (FIG. 4), and the HE-SIG3 in the DL subframe additionally transmits the remaining DL SI.
- FIG. 14d the AP transmits the partial SI of the STA in the DL subframe and the SI of the STA in the UL subframe in the HE-SIG2 (FIG. 4), and the HE-SIG3 in the DL subframe additionally transmits the remaining DL SI.
- FIG. 4 the HE-SIG3 in the DL subframe
- the STA can adjust the scheduling parameters according to actual channel conditions when transmitting data. For example, if there is sudden interference, the MCS can be appropriately reduced to meet the PER requirement when the test data is guaranteed. More specifically, for the working principle described in FIG. 13, the frame of FIG.
- the HE-SIG3 part is transmitted in the STA-specific HE-preamble of the downlink AP transmitting end, and the downlink STA receiving end is in the STA-specific HE-
- the preamble has the HE-SIG3 part of the reception; the uplink STA sender, the STA Control Unit module has the scheduling parameter adjustment function, the HE-SIG3 needs to be sent in the STA-specific HE-preamble, and the uplink AP receiver corresponds to the STA-specific HE-
- Fig. 14e it is a special case of the frame of Fig.
- the AP transmits the SI of the STA in the UL subframe in the HE-SIG2. If the STA detects its own control information in the UL-SI, it needs to receive data in the subsequent UL subframe according to the scheduling information indicated by the AP.
- the SIG field for informing the UL SI is not included in the UL subframe transmitted by the STA.
- the application scenario of such a frame is that the AP uniformly controls uplink multi-user transmission. More specifically, for the working principle described in FIG. 13, the frame of FIG.
- the STA Control Unit module has no scheduling parameter adjustment function, and there is no transmission of the HE-SIG3 part in the STA-specific HE-preamble, and the uplink AP receiving end does not have the STA-specific HE- Reception of the HE-S IG3 part in preamb 1 e.
- the AP transmits the SI of the STA in the UL subframe in the HE-SIG2. If there is its own control information in the UL-SI, it is necessary to receive data in the subsequent UL subframe according to the scheduling information indicated by the AP.
- the difference from the frame shown in FIG. 14e is that the SIG field (HE-SIG3) in which the STA informs the UL SI is included in the UL subframe.
- the STA can adjust the scheduling parameters according to the actual channel conditions when transmitting the data. More specifically, for the working principle described in FIG. 13, the frame of FIG.
- the AP transmits the SI of the STA in the DL subframe in the HE-SIG2. If the STA detects its own control information in the DL-SI in the HE-SIG2, it needs to receive data in the subsequent DL subframe according to the scheduling information indicated by the AP.
- the SIG field of the DL SI is not included in the DL subframe transmitted by the AP. More specifically, for the working principle described in FIG. 13, the frame of FIG.
- the HE-SIG2 transmitted by the AP includes the partial SI of the STA in the DL subframe, and the remaining DL SI of the HE-SIG3 in the DL subframe. The difference from FIG.
- the DL STA specified in HE-SIG2 continues to detect the remaining DL SI in the SIG field (HE-SIG3) in the DL subframe, which can reduce the overhead of the common control information field (HE-SIG2).
- the AP indicates the ID of the DL STA and the location information of the allocated resource in the HE-SIG2, and specifically transmits the STA-specific control information, such as the MCS, the data length, the spatial stream, and the like in the HE-SIG3.
- the HE-SIG3 can use the LTF of frequency taking and spatial multiplexing to obtain control information of different users/flows, and improve the efficiency of signaling transmission. More specifically, for the working principle described in FIG. 13, the frame of FIG.
- 14h is used, and the HE-SIG3 part is transmitted in the STA-specific HE-preamble of the downlink AP transmitting end, and the downlink STA receiving end is used. There is a reception of the HE-SIG3 part in the STA-specif ic HE-preamble. Because there is no uplink data, the transmitting module of the uplink STA end and the receiving module of the uplink AP end are closed.
- 14a-h show an example of a channel format (for example, a frame format on 2 (Hz); an embodiment of a frame structure in a plurality of Channel cases shown in Fig. 14i. The frames shown in the aforementioned Figs.
- HE-SIG1 contains common control information. For example, system bandwidth, number of subsequent DL/UL subframes, start and length information, and, if necessary, HE-SIG2 transmission control information.
- HE-SIG2 can transmit STA-specifc control information on the bandwidth specified by HE-SIG1.
- the foregoing frame formats can support uplink and downlink frequency division multiplexing and space division multiplexing multi-user transmission, and can be applied to burst data access. The above scheme can be directly applied to a WiFi system with backward compatibility.
- the embodiments may also support signaling to efficiently indicate uplink and downlink multi-user transmission, save signaling overhead, reduce data detection delay, etc.
- the embodiment "or” embodiment means that a particular feature, structure, or characteristic relating to an embodiment is included in at least one embodiment of the invention. Thus, “in one embodiment” occurs throughout the specification or The “in an embodiment” does not necessarily refer to the same embodiment.
- these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
- the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
- system and “network” are often used interchangeably herein.
- the term "and/or” in this context is merely an association that describes an associated object, indicating that there may be three relationships, for example, A and/or B, can be expressed as: There are A alone, there are A and B, and there are three cases of B.
- the character "/" in this article generally means that the context object is an "or”. Relations.
- B corresponding to A means that B is associated with A, and B can be determined according to A.
- determining B from A does not mean that B is determined solely from A, and that B can also be determined based on A and/or other information.
- the disclosed systems, devices, and methods may be implemented in other ways.
- the device embodiments described above are merely illustrative.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
- the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
- each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
- Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
- a storage medium may be any available media that can be accessed by a computer.
- the computer readable medium can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used to carry or store an instruction or data structure.
- connection may suitably be a computer readable medium.
- the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital STA line (DSL), or wireless technologies such as infrared, radio, and microwave
- coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwaves are included in the fixing of the associated media.
- a disc (disc) and a disc (disc) include a compact disc (CD), a laser disc, a disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically replicated, and The disc uses a laser to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.
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EP14895506.5A EP3151459B1 (en) | 2014-06-27 | 2014-07-17 | Resource indication processing method, processing apparatus, access point and site |
KR1020177001718A KR101863713B1 (ko) | 2014-06-27 | 2014-07-17 | 자원 지시 처리 방법 및 처리 장치, 액세스 포인트, 및 스테이션 |
CN201480080152.5A CN106464442A (zh) | 2014-06-27 | 2014-07-17 | 资源指示的处理方法、处理装置、接入点和站点 |
JP2016575547A JP6498707B2 (ja) | 2014-06-27 | 2014-07-17 | リソース標識処理方法及び処理装置、アクセスポイント、並びにステーション |
US15/387,265 US10548156B2 (en) | 2014-06-27 | 2016-12-21 | Resource indication processing method and processing apparatus, access point, and station |
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JP2017529717A (ja) | 2017-10-05 |
CN106464442A (zh) | 2017-02-22 |
EP3151459A1 (en) | 2017-04-05 |
US20170105229A1 (en) | 2017-04-13 |
JP6498707B2 (ja) | 2019-04-10 |
KR20170021309A (ko) | 2017-02-27 |
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US10548156B2 (en) | 2020-01-28 |
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