WO2017142210A1 - 무선랜 시스템에서 상향링크 확인응답 신호 송수신 방법 및 이를 위한 장치 - Google Patents
무선랜 시스템에서 상향링크 확인응답 신호 송수신 방법 및 이를 위한 장치 Download PDFInfo
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
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- 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
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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- H—ELECTRICITY
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- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1896—ARQ related signaling
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Definitions
- This document relates to transmitting and receiving an uplink acknowledgment signal in a WLAN system, and more particularly, to a method and apparatus for efficiently transmitting and receiving an acknowledgment signal for downlink multi-user data.
- WLAN wireless local area network
- IEEE 802.11a and b are described in 2.4. Using unlicensed band at GHz or 5 GHz, IEEE 802.11b provides a transmission rate of 11 Mbps and IEEE 802.11a provides a transmission rate of 54 Mbps.
- IEEE 802.11g applies orthogonal frequency-division multiplexing (OFDM) at 2.4 GHz to provide a transmission rate of 54 Mbps.
- IEEE 802.11n applies multiple input multiple output OFDM (MIMO-OFDM) to provide a transmission rate of 300 Mbps for four spatial streams. IEEE 802.11n supports channel bandwidths up to 40 MHz, in this case providing a transmission rate of 600 Mbps.
- the WLAN standard uses a maximum of 160MHz bandwidth, supports eight spatial streams, and supports IEEE 802.11ax standard through an IEEE 802.11ac standard supporting a speed of up to 1Gbit / s.
- each station STA
- data transmission of each station is generally performed on a contention basis based on the determination of whether each medium is idle or busy.
- a multi-user transmission scheme As a multi-user transmission scheme is used, uplink multi-transmission for transmitting data of a plurality of STAs to an access point (AP) and downlink multi-transmission for transmitting data of an AP to a plurality of STAs
- AP access point
- downlink multi-transmission for transmitting data of an AP to a plurality of STAs
- communication based on uplink scheduling and downlink scheduling is required.
- scheduling information on transmission of a physical protocol data unit (PPDU) for uplink multi-user transmission may be transmitted using a trigger frame.
- the AP transmits a separate trigger frame to transmit a PPDU for downlink multi-user transmission and receive an acknowledgment signal thereof in a multi-user manner, the procedure may be delayed and unnecessary signaling overhead may occur.
- PPDU physical protocol data unit
- the present invention provides a method and an apparatus therefor for efficiently transmitting and receiving an acknowledgment signal for downlink multi-user data.
- the present invention is not limited to the above-described technical problem and other technical problems can be inferred from the embodiments of the present invention.
- a control information subfield including uplink scheduling information Receives a downlink physical protocol data unit (PPDU) including downlink data from an access point (AP), and includes an uplink PPDU including an acknowledgment signal for the downlink data according to the uplink scheduling information.
- the control information subfield does not include space reuse information, and the STA may set that space reuse is deactivated according to the downlink PPDU reception.
- the STA uses a CP (Cyclic Prefix) and LTF structure of the uplink PPDU according to the downlink PPDU reception, (1) 4x LTF and 3.2 us CP, or (2) 2x LTF and 1.6 us CP You can choose only one of the two.
- CP Cyclic Prefix
- the control information subfield does not include dual carrier modulation (DCM) information, and the STA may determine whether the uplink PPDU is DCM in consideration of the MCS of the downlink PPDU.
- DCM dual carrier modulation
- the control information subfield does not include bandwidth information, and the STA may determine the bandwidth of the uplink PPDU to be the same as the bandwidth of the downlink PPDU.
- the control information subfield does not include MU MIMO LTF mode, STBC, stream number, stream allocation, and coding type information, and the STA determines the MU MIMO LTF mode, the STBC, the stream number according to the downlink PPDU reception.
- the parameters for the stream allocation and the coding type may be set to zero.
- the MCS information has a 2-bit length, and the STA may select an MCS level corresponding to the MCS information among the lowest four MCS levels among a plurality of predetermined MCS levels.
- the uplink PPDU may include one of an individual acknowledgment signal for the downlink data, a block Ack (BA), or a multi-user Multi-STA Block Ack (BA).
- BA block Ack
- BA multi-user Multi-STA Block Ack
- the control information subfield may have a 30-bit length by additionally including 4-bit control ID information, and the length information of the uplink PPDU may have a 5-bit length.
- a station (STA) for transmitting an acknowledgment signal for downlink data in a WLAN system includes a control information subfield including uplink scheduling information, and downlink data.
- a transceiver configured to receive a downlink physical protocol data unit (PPDU) from an access point (AP); And a processor configured to process the uplink scheduling information to transmit an uplink PPDU including an acknowledgment signal for the downlink data to the AP through the transceiver, wherein the processor controls the control information subfield.
- PPDU physical protocol data unit
- a length information of the uplink PPDU, resource unit (RU) allocation information of the uplink PPDU, uplink MCS information of the uplink PPDU, transmission power of the AP, and a target RSSI of the AP A station is proposed that processes the uplink scheduling information on the assumption that signal strength indicator) is included.
- the processor may assume that the space for reuse of the uplink PPDU is deactivated upon reception of the downlink PPDU, assuming that the control information subfield does not include space reuse information.
- the processor uses a CP (Cyclic Prefix) and LTF structure of the uplink PPDU according to the downlink PPDU received, (1) 4x LTF and 3.2 us CP, or (2) 2x LTF and 1.6 us CP You can choose only one of the two.
- CP Cyclic Prefix
- the processor may assume that the control information subfield does not include dual carrier modulation (DCM) information, and determine whether the uplink PPDU is DCM in consideration of the MCS of the downlink PPDU.
- DCM dual carrier modulation
- the control information sub including uplink scheduling information Transmitting a downlink physical protocol data unit (PPDU) including a field and downlink data to the STA, and transmitting the uplink PPDU including an acknowledgment signal for the downlink data according to the uplink scheduling information.
- PPDU physical protocol data unit
- the control information subfield Received from the control information subfield, the length information of the uplink PPDU, resource unit (RU) allocation information for the uplink PPDU, uplink MCS information for the uplink PPDU, transmission power of the AP, And an acknowledgment signal receiving method including target target signal strength indicator (RSSI) information of the AP.
- RSSI target target signal strength indicator
- an access point for receiving an acknowledgment signal for downlink data from a station (STA) in a WLAN system, a control information subfield including uplink scheduling information, and a downlink A processor constituting a downlink physical protocol data unit (PPDU) including link data; And a transceiver for receiving the downlink PPDU from the processor and transmitting the downlink PPDU to the STA, and receiving an uplink PPDU from the STA including an acknowledgment signal for the downlink data according to the uplink scheduling information.
- AP access point
- STA station
- a control information subfield including uplink scheduling information
- a downlink A processor constituting a downlink physical protocol data unit (PPDU) including link data
- a transceiver for receiving the downlink PPDU from the processor and transmitting the downlink PPDU to the STA, and receiving an uplink PPDU from the STA including an acknowledgment signal for the downlink data according to the uplink scheduling information.
- the processor may include the control information subfield including length information of the uplink PPDU, resource unit (RU) allocation information for the uplink PPDU, uplink MCS information for the uplink PPDU, transmission power of the AP, and
- the AP is configured to include target target signal strength indicator (RSSI) information of the AP.
- RSSI target target signal strength indicator
- communication in order to transmit an acknowledgment signal for downlink multi-user data, communication can be efficiently performed without a separate trigger frame transmission.
- 1 is a diagram for describing a method in which STAs generally transmit data in a WLAN system.
- FIG. 2 is a diagram for describing an uplink multi-user transmission situation in an HE system.
- 3 to 5 are diagrams for describing the format of a trigger frame used in the HE system.
- FIG. 6 is a diagram illustrating a method of transmitting an uplink acknowledgment signal according to an embodiment of the present invention.
- FIG. 7 to 8 illustrate a format of an A-Control subfield that may be included in a DL PPDU and used for transmitting uplink scheduling information according to an embodiment of the present invention.
- FIG. 9 is a diagram for describing control information which is the most basic of UL MU scheduling information to be included in a DL PPDU according to an embodiment of the present invention.
- FIG. 10 illustrates an example of UL MU scheduling information to be transmitted through a control subfield of a DL PPDU according to an embodiment of the present invention.
- FIG. 11 is a block diagram illustrating an exemplary configuration of an AP apparatus (or base station apparatus) and a station apparatus (or terminal apparatus) according to an embodiment of the present invention.
- 1 is a diagram for describing a method in which STAs generally transmit data in a WLAN system.
- TXOP Transmission
- Opportunity is based on a competitive scheme.
- the first STA before transmitting data to the second STA, transmits a Request to Send (RTS) frame to the second STA and, in response, receives a Clear to Send (CTS) frame from the second STA.
- RTS Request to Send
- CTS Clear to Send
- the exchange of the RTS / CTS frame is to solve the hidden node / exposed node problem, as is well known.
- the third STA (other) may respond to the reception of the RTS / CTS.
- a network allocation vector (NAV) may be set in consideration of the data transmission interval.
- the third STA may delay access to the medium as shown in FIG. 1 during the NAV setting period, and may prepare for transmission by performing a backoff procedure in the contention window after the NAV period ends.
- the first STA receiving the CTS from the second STA may transmit data after the short interframe space (SIFS), and the second STA receiving the data from the first STA may transmit an ACK frame thereto.
- SIFS short interframe space
- a multi-user transmission scheme is used to transfer data of a plurality of STAs to an access point (AP).
- AP access point
- Downlink multi-transmission for transmitting and downlink multi-transmission for transmitting data of the AP to a plurality of STAs are used. Accordingly, communication based on uplink scheduling and downlink scheduling is required.
- FIG. 2 is a diagram for describing an uplink multi-user transmission situation in an HE system.
- an AP may transmit a trigger frame (eg, STA 1 to STA 4) to a plurality of STAs (eg, STA 1 to STA 4). It can be started by sending a trigger frame.
- the trigger frame may include UL MU allocation information (eg, resource location and size, STA IDs, MCS, MU type (MIMO, OFDMA, etc.)).
- UL MU allocation information eg, resource location and size, STA IDs, MCS, MU type (MIMO, OFDMA, etc.
- the plurality of STAs (STAs 1-4) that receive the trigger frame from the AP may transmit UL MU data frames based on scheduling information of the trigger frame, respectively, and the AP may transmit an acknowledgment signal (ACK).
- ACK acknowledgment signal
- the acknowledgment signal may be transmitted through a block ACK (BA) or a multi-user block ACK (BA) frame.
- 3 to 5 are diagrams for describing the format of a trigger frame used in the HE system.
- FIG. 4 is a diagram illustrating in detail a common information field (Common Info) in the trigger frame illustrated in FIG. 3
- FIG. 5 is a diagram illustrating a user specific information field (Per User Info) in the trigger frame illustrated in FIG. 3. Specifically, the figure.
- a duration field indicates a length of a corresponding frame
- an RA field may indicate a reception STA of a trigger frame
- a TA field may indicate a transmission STA of a trigger frame
- the length subfield may indicate the value of the L-SIG length field of the HE trigger based PPDU transmitted in response to the trigger frame.
- the Cascade indicator subfield when the Cascade indicator subfield is set to 1, it may represent that another trigger frame is transmitted following the currently received trigger frame. Otherwise, the Cascade Indicator Subfield is set to zero.
- the HE SIG-A information subfield of the common information field may indicate the content of the HE-SIG A field of the HE trigger-based PPDU response transmitted in response to the trigger frame.
- the CP and LTF type subfields may indicate CP and HE-LTF types of the HE trigger based PPDU response. Accordingly, CP and LTF types that can be represented are as follows.
- the trigger type subfield may indicate the type of trigger frame.
- the type of trigger frame may have the following values.
- Trigger Type Value Trigger Type Description 0 Basic trigger One Beamforming Report Poll Trigger 2 MU-BAR 3 MU-RTS 4-TBD reserved
- the user identifier subfield indicates an AID of an STA allocated to a resource unit (RU) for transmitting the MPDU (s) in the HE trigger based PPDU.
- the RU allocation subfield of the user specific information field indicates an RU used by the STA indicated by the aforementioned user identifier subfield to transmit HE trigger based PPDU.
- the coding type subfield of the user specific field indicates the coding type of the HE trigger based PPDU. For example, when the corresponding field is set to 0, BCC may be indicated and when it is set to 1, LDPC may be indicated.
- the MCS subfield may indicate an MCS to be applied to the HE trigger based PPDU response.
- the following is an example of an MCS that can be applied to one stream, 26-tone RU.
- the DCM subfield may indicate whether dual carrier modulation (DCM) is applied to the HE trigger based PPDU response. If the subfield value is set to 1, this indicates that DCM is applied to the HE trigger-based PPDU. In the opposite case, the subfield value is set to 0.
- DCM dual carrier modulation
- the SS assignment subfield may indicate the number of spatial streams of the HE trigger based PPDU response.
- the padding field is to provide a time that each HE STA can prepare for the UL MU transmission.
- scheduling information on PPDU transmission for uplink multi-user transmission may be transmitted using a trigger frame.
- the AP transmits a separate trigger frame to transmit a PPDU for downlink multi-user transmission and receive an acknowledgment signal thereof in a multi-user manner, the procedure may be delayed and unnecessary signaling overhead may occur.
- FIG. 6 is a diagram illustrating a method of transmitting an uplink acknowledgment signal according to an embodiment of the present invention.
- the acknowledgment signal for the downlink data by the downlink multi-user transmission scheme may also be transmitted in a multi-user scheme. Scheduling information may be required to transmit the acknowledgment signal through multi-user transmission.
- scheduling information on transmission of a physical protocol data unit (PPDU) for uplink multi-user transmission may be transmitted using a trigger frame.
- the AP transmits a separate trigger frame to transmit a PPDU for downlink multi-user transmission and receive an acknowledgment signal thereof in a multi-user manner, the procedure may be delayed and unnecessary signaling overhead may occur.
- PPDU physical protocol data unit
- uplink trigger information when transmitting data in a downlink multi-user scheme, uplink trigger information may be included in a DL PPDU and transmitted.
- FIG. 6 illustrates that UL trigger information is included in the A-MPDU transmitted to each user and transmitted. Accordingly, each STA transmits a BA according to the received UL trigger information included in the DL PPDU.
- various methods such as general ACK, BA, and multi-user BA may be used as a method of transmitting an acknowledgment signal.
- FIG. 7 to 8 illustrate a format of an A-Control subfield that may be included in a DL PPDU and used for transmitting uplink scheduling information according to an embodiment of the present invention.
- FIG. 7 illustrates a structure including a plurality (N) A-Control subfields, and each control subfield has a length of 30 bits.
- each control subfield constituting the A-Control subfield may include a 4-bit control ID field as shown in FIG. 8, and the control ID field value may be set as follows.
- control ID field value of FIG. 8 is set to 0 when transmitting uplink multi-user response scheduling information handled in the present embodiment.
- the control field in the A-Control subfield should be included in 26 bits. Looking at the control information, if not included in the STA looks at how to set the information.
- FIG. 9 is a diagram for describing control information which is the most basic of UL MU scheduling information to be included in a DL PPDU according to an embodiment of the present invention.
- the basic control information includes UL PPDU length information and RU allocation information as shown in FIG. 9.
- the reason why the UL MU scheduling information is transmitted for BA transmission for DL data is to inform the length and RU allocation information of the corresponding UL PPDU.
- a granularity of 1 us may represent a length up to 512 us, and a granularity of 2 us may represent a length up to 1024 us.
- the length of the 6-bit UL PPDU may be 64 * (12.8us + 0.8us) + legacy PHY header length + length of HE SIG-A + HE LTF length> 870us.
- the UL PPDU length of 5 bits may represent up to 32 * (12.8us + 0.8us) + legacy PHY header length + length of HE SIG-A + HE LTF length> 435.2us. Therefore, in consideration of the space for additional control information, in the preferred embodiment of the present invention, as shown in FIG. 9, the length of 5/6 bits is determined to be sufficient, unlike the allocation of up to 9 bits in the UL PPDU length subfield. As described above, it is proposed to use a short length UL PPDU length subfield.
- the RU assignment subfield indicates an RU allocated for transmitting a UL MU response.
- the simplest setting for the RU allocation subfield is to set it to 8 bits long, as it is assigned to the trigger frame.
- the corresponding field may be set to 7 bits and operated as follows.
- DL MU transmission on one 80 MHz channel may be set so that it is not acknowledged through ACK / BA / M-BA on another 80 MHz channel.
- the corresponding option may not be an appropriate option.
- the trigger frame may be set to be used.
- FIG. 10 illustrates an example of UL MU scheduling information to be transmitted through a control subfield of a DL PPDU according to an embodiment of the present invention.
- the control information subfield includes length information of an uplink PPDU, resource unit (RU) allocation information for an uplink PPDU, uplink MCS information for an uplink PPDU, and transmission of an AP. It is proposed to set to include the power (DL Tx Power) and target RSSI (Target receive signal strength indicator) information of the AP.
- Information that requires explicit signaling among UL MU scheduling information transmitted through a trigger frame includes length information of an uplink PPDU, RU allocation information for an uplink PPDU, uplink MCS information for an uplink PPDU, transmission power of an AP, And selecting the target RSSI information of the AP.
- the STA side estimates the received information of the DL PPDU or uses a preset value without explicit signaling of the AP.
- the length information of the uplink PPDU and the RU allocation information for the uplink PPDU are the same as described above with reference to FIG. 9, but instead of including the 9-bit UL PPDU length subfield of FIG. 9. For the same reason, it is proposed to include a 5-bit UL PPDU length subfield.
- FIG. 10 illustrates the use of a total of 10 bits each having a 5-bit length for signaling of transmission / reception power related information.
- FIG. 10 also includes UL MCS as information requiring explicit signaling.
- this embodiment proposes to use a 2-bit short length MCS.
- Such a 2-bit MCS is preferably set to represent any one of four MCSs that apply the lowest modulation and coding scheme among all available MCSs.
- information omitted from the UL MU scheduling information may be set to a predetermined value at the STA side or may be estimated using the received information of the received DL MU PPDU.
- MCS used for data transmission
- DL MU PPDU more robust transmission is required. Therefore, it is difficult to borrow MCS applied to DL MU PPDU as it is.
- ignoring channel conditions and applying fixed MCS can also lead to performance degradation.
- length information of an uplink PPDU As shown in FIG. 10, length information of an uplink PPDU, resource unit (RU) allocation information for an uplink PPDU, uplink MCS information for an uplink PPDU, a DL Tx Power of an AP, And 26-bit length control information by setting to include target RSSI (Target receive signal strength indicator) information of the AP, which is a total of 30 bits together with a 4-bit control ID field as shown in FIG. 8.
- the subfield length can be adjusted.
- the control information subfield of the DL PPDU may not include the CP and LTF structure fields.
- 2 bits are used to represent this field, but in practice, only two values, 2xLTF + 1.6us CP size and 4xLTF + 3.2us CP size, are used for the UL MU PPDU.
- a 1 bit LTF and CP field may be used, and in this case, the corresponding field value may be represented as follows.
- the STA may configure the CP and LTF structure of the uplink PPDU to use any one of the two cases according to the downlink PPDU reception.
- control information subfield may not include dual carrier modulation (DCM) information.
- DCM dual carrier modulation
- MCS multi-bit simple signaling
- whether to apply DCM may be determined by the STA in consideration of the MCS of the DL MU PPDU and determine whether the UL MU PPDU is DCM. Can be. That is, when DCM is applied to the received DL MU PPDU, DCM may be applied to the UL MU PPDU, and in the opposite case, it may be configured to process accordingly.
- control information subfield does not include bandwidth information, and the STA may determine the bandwidth of the UL MU PPDU to be the same as the bandwidth of the DL MU PPDU.
- the above control information may configure the information of the UL MU PPDU through the reception information of the DL MU PPDU even if the STA does not receive explicit signaling from the AP.
- the control information subfield of the DL PPDU may not include spatial reuse information. If the space reuse field defined in the existing HE-SIG A is used, it will occupy 4 bits in length. However, in the ACK / BA / M-BA transmission for the UL MU data transmission, the gain due to the application of space reuse is not large compared to the problem of space limitation for the above signaling. Accordingly, in an embodiment of the present invention, it is preferable to set the control information subfield so as not to include spatial reuse information as described above, and set the STA to be disabled in accordance with the DL PPDU reception. Do.
- control information subfield does not include MU MIMO LTF mode, STBC, number of streams, stream allocation, and coding type information
- a STA may determine that the MU MIMO LTF mode, the STBC, Parameters for the stream number, the stream allocation, and the coding type may be set to zero.
- the cascade indication is also preferably set to 0 without additional signaling.
- FIG. 10 is not the only embodiment of the present invention.
- other configuration examples of the control field of the DL PPDU will be described.
- TXOP field 15 bits are conventionally used in MAC duration, and in HE-SIG A, it is determined to be one of values between 5 and 7 bits. Since it is difficult to insert TXOP in a limited size, a 1 bit TXOP field may be used.
- this field indicates that the TXOP value is set to 0.
- the corresponding UL MU ACK / BA is the last frame in TXOP (UL of TXOP), it is set to zero.
- this field indicates to set TXOP to the value obtained through calculation. Usually set based on the MAC duration of the current / previous frame.
- MCS used in the currently received DL frame uses two-stage lower MCS
- FIG. 11 is a block diagram illustrating an exemplary configuration of an AP apparatus (or base station apparatus) and a station apparatus (or terminal apparatus) according to an embodiment of the present invention.
- the AP 100 may include a processor 110, a memory 120, and a transceiver 130.
- the station 150 may include a processor 160, a memory 170, and a transceiver 180.
- the transceivers 130 and 180 may transmit / receive radio signals and may implement, for example, a physical layer in accordance with the IEEE 802 system.
- the processors 110 and 160 may be connected to the transceivers 130 and 180 to implement a physical layer and / or a MAC layer according to the IEEE 802 system.
- Processors 110 and 160 may be configured to perform operations in accordance with one or more combinations of the various embodiments of the invention described above.
- the modules for implementing the operations of the AP and the station according to various embodiments of the present invention described above may be stored in the memory 120 and 170 and executed by the processors 110 and 160.
- the memories 120 and 170 may be included in the processors 110 and 160 or may be installed outside the processors 110 and 160 and connected to the processors 110 and 160 by a known means.
- the above descriptions of the AP device 100 and the station device 150 may be applied to a base station device and a terminal device in another wireless communication system (eg, LTE / LTE-A system).
- LTE / LTE-A system another wireless communication system
- the detailed configuration of the AP and the station apparatus as described above may be implemented to be applied independently or the two or more embodiments described at the same time described in the various embodiments of the present invention, overlapping description is omitted for clarity do.
- embodiments of the present invention can be applied to various wireless communication systems, including IEEE 802.11 systems.
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Abstract
Description
CP and LTF field value | Description |
0 | 2x LTF +0.8 μs CP |
1 | 2x LTF +1.6 μs CP |
2 | 4x LTF +3.2 μs CP |
3-TBD | Reserved |
Trigger Type Value | Trigger Type Description |
0 | Basic Trigger |
1 | Beamforming Report Poll Trigger |
2 | MU-BAR |
3 | MU-RTS |
4-TBD | reserved |
Control ID Value | Meaning | Length, in bits, of the Control Information subfield |
0 | UL MU response scheduling | TBD |
1 | Receive operation mode indication | TBD |
2 | HE link adaptation | TBD |
TBD | 000 | |
8-15 | Reserved |
Claims (15)
- 무선랜 시스템에서 스테이션(STA)이 하향링크 데이터에 대한 확인응답 신호를 전송하는 방법에 있어서,상향링크 스케줄링 정보를 포함하는 제어 정보 서브필드, 및 하향링크 데이터를 포함하는 하향링크 PPDU(Physical Protocol Data Unit)를 AP(Access Point)로부터 수신하고,상기 상향링크 스케줄링 정보에 따라 상기 하향링크 데이터에 대한 확인응답 신호를 포함하는 상향링크 PPDU를 상기 AP에 전송하되,상기 제어 정보 서브필드는,상기 상향링크 PPDU의 길이 정보,상기 상향링크 PPDU에 대한 RU(Resource Unit) 할당 정보,상기 상향링크 PPDU에 대한 상향링크 MCS 정보,상기 AP의 전송 전력, 및상기 AP의 타겟 RSSI(Target receive signal strength indicator) 정보를 포함하는, 확인응답 신호 전송 방법.
- 제 1 항에 있어서,상기 제어 정보 서브필드는 공간 재사용 정보를 포함하지 않으며,상기 STA은 상기 하향링크 PPDU 수신에 따라 공간 재사용이 비활성화되는 것으로 설정하는, 확인응답 신호 전송 방법.
- 제 1 항에 있어서,상기 STA은 상기 하향링크 PPDU 수신에 따라 상기 상향링크 PPDU의 CP (Cyclic Prefix) 및 LTF 구조를,(1) 4x LTF 와 3.2 us CP를 이용하는 구조, 또는(2) 2x LTF와 1.6 us CP를 이용하는 구조2가지 중 하나로만 선택하는, 확인응답 신호 전송 방법.
- 제 1 항에 있어서,상기 제어 정보 서브필드는 DCM (Dual Carrier Modulation) 정보를 포함하지 않으며,상기 STA은 상기 하향링크 PPDU의 MCS를 고려하여 상기 상향링크 PPDU의 DCM 여부를 결정하는, 확인응답 신호 전송 방법.
- 제 1 항에 있어서,상기 제어 정보 서브필드는 대역폭 정보를 포함하지 않으며,상기 STA은 상기 상향링크 PPDU의 대역폭을 상기 하향링크 PPDU의 대역폭과 동일하게 결정하는, 확인응답 신호 전송 방법.
- 제 1 항에 있어서,상기 제어 정보 서브필드는 MU MIMO LTF 모드, STBC, 스트림 할당, 스트림 수 및 코딩 타입 정보를 포함하지 않으며,상기 STA은 상기 하향링크 PPDU 수신에 따라 상기 MU MIMO LTF 모드, 상기 STBC, 상기 스트림 할당, 상기 스트림 수 및 상기 코딩 타입에 대한 파라미터들을 0으로 설정하는, 확인응답 신호 전송 방법.
- 제 1 항에 있어서,상기 MCS 정보는 2비트 길이를 가지며,상기 STA은 미리 정해진 복수의 MCS 레벨들 중 가장 낮은 4개의 MCS 레벨 중 상기 MCS 정보에 대응하는 MCS 레벨을 선택하는, 확인응답 신호 전송 방법.
- 제 1 항에 있어서,상기 상향링크 PPDU는 상기 하향링크 데이터에 대한 개별 확인응답 신호, BA (Block Ack) 또는 다중 사용자 BA (Multi-STA Block Ack) 중 하나를 포함하는, 확인응답 신호 전송 방법.
- 제 1 항에 있어서,상기 제어 정보 서브필드는 4비트 길이의 제어 ID 정보를 추가적으로 포함하여 30 비트 길이를 가지며,상기 상향링크 PPDU의 길이 정보는 5비트 길이를 가지는, 확인응답 신호 전송 방법.
- 무선랜 시스템에서 하향링크 데이터에 대한 확인응답 신호를 전송하는 스테이션(STA)에 있어서,상향링크 스케줄링 정보를 포함하는 제어 정보 서브필드, 및 하향링크 데이터를 포함하는 하향링크 PPDU(Physical Protocol Data Unit)를 AP(Access Point)로부터 수신하도록 구성되는 송수신기; 및상기 상향링크 스케줄링 정보를 처리하여, 상기 하향링크 데이터에 대한 확인응답 신호를 포함하는 상향링크 PPDU를 상기 송수신기를 통해 상기 AP에 전송하도록 제어하는 프로세서를 포함하되,상기 프로세서는 상기 제어 정보 서브필드가,상기 상향링크 PPDU의 길이 정보,상기 상향링크 PPDU에 대한 RU(Resource Unit) 할당 정보,상기 상향링크 PPDU에 대한 상향링크 MCS 정보,상기 AP의 전송 전력, 및상기 AP의 타겟 RSSI(Target receive signal strength indicator) 정보를 포함하는 것을 가정하여 상기 상향링크 스케줄링 정보를 처리하는, 스테이션.
- 제 10 항에 있어서,상기 프로세서는 상기 제어 정보 서브필드가 공간 재사용 정보를 포함하지 않는 것을 가정하여, 상기 하향링크 PPDU 수신에 따라 상기 상향링크 PPDU의 공간 재사용이 비활성화되는 것으로 설정하는, 스테이션.
- 제 10 항에 있어서,상기 프로세서는 상기 하향링크 PPDU 수신에 따라 상기 상향링크 PPDU의 CP (Cyclic Prefix) 및 LTF 구조를,(1) 4x LTF 와 3.2 us CP를 이용하는 구조, 또는(2) 2x LTF와 1.6 us CP를 이용하는 구조2가지 중 하나로만 선택하는, 스테이션.
- 제 10 항에 있어서,상기 프로세서는 상기 제어 정보 서브필드가 DCM (Dual Carrier Modulation) 정보를 포함하지 않는 것으로 가정하고, 상기 하향링크 PPDU의 MCS를 고려하여 상기 상향링크 PPDU의 DCM 여부를 결정하는, 스테이션.
- 무선랜 시스템에서 AP (Access Point)가 스테이션(STA)으로부터 하향링크 데이터에 대한 확인응답 신호를 수신하는 방법에 있어서,상향링크 스케줄링 정보를 포함하는 제어 정보 서브필드, 및 하향링크 데이터를 포함하는 하향링크 PPDU(Physical Protocol Data Unit)를 상기 STA에 전송하고,상기 상향링크 스케줄링 정보에 따라 상기 하향링크 데이터에 대한 확인응답 신호를 포함하는 상향링크 PPDU를 상기 STA으로부터 수신하되,상기 제어 정보 서브필드는,상기 상향링크 PPDU의 길이 정보,상기 상향링크 PPDU에 대한 RU(Resource Unit) 할당 정보,상기 상향링크 PPDU에 대한 상향링크 MCS 정보,상기 AP의 전송 전력, 및상기 AP의 타겟 RSSI(Target receive signal strength indicator) 정보를 포함하는, 확인응답 신호 수신 방법.
- 무선랜 시스템에서 스테이션(STA)으로부터 하향링크 데이터에 대한 확인응답 신호를 수신하는 AP (Access Point)에 있어서,상향링크 스케줄링 정보를 포함하는 제어 정보 서브필드, 및 하향링크 데이터를 포함하는 하향링크 PPDU(Physical Protocol Data Unit)를 구성하는 프로세서; 및상기 프로세서로부터 상기 하향링크 PPDU를 수신하여 상기 STA에 전송하고, 상기 상향링크 스케줄링 정보에 따라 상기 하향링크 데이터에 대한 확인응답 신호를 포함하는 상향링크 PPDU를 상기 STA으로부터 수신하는 송수신기를 포함하되,상기 프로세서는 상기 제어 정보 서브필드가,상기 상향링크 PPDU의 길이 정보,상기 상향링크 PPDU에 대한 RU(Resource Unit) 할당 정보,상기 상향링크 PPDU에 대한 상향링크 MCS 정보,상기 AP의 전송 전력, 및상기 AP의 타겟 RSSI(Target receive signal strength indicator) 정보를 포함하도록 구성하는, AP.
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KR1020187022689A KR101966132B1 (ko) | 2016-02-17 | 2017-01-16 | 무선랜 시스템에서 상향링크 확인응답 신호 송수신 방법 및 이를 위한 장치 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2020180007A1 (ko) * | 2019-03-07 | 2020-09-10 | 엘지전자 주식회사 | 복수의 ap를 이용한 신호 송신 |
US11968652B2 (en) | 2019-03-07 | 2024-04-23 | Lg Electronics Inc. | Signal transmission using plurality of APs |
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KR101966132B1 (ko) | 2019-04-05 |
US20180324840A1 (en) | 2018-11-08 |
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EP3419203A4 (en) | 2019-09-18 |
EP4262131A2 (en) | 2023-10-18 |
EP4262131A3 (en) | 2024-01-10 |
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