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WO2017043912A1 - Method for transmitting signal in wireless lan system and device therefor - Google Patents

Method for transmitting signal in wireless lan system and device therefor

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Publication number
WO2017043912A1
WO2017043912A1 PCT/KR2016/010158 KR2016010158W WO2017043912A1 WO 2017043912 A1 WO2017043912 A1 WO 2017043912A1 KR 2016010158 W KR2016010158 W KR 2016010158W WO 2017043912 A1 WO2017043912 A1 WO 2017043912A1
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WO
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Prior art keywords
channel
sta
bonding
ap
ru
Prior art date
Application number
PCT/KR2016/010158
Other languages
French (fr)
Korean (ko)
Inventor
박성진
조한규
김진민
조경태
박은성
Original Assignee
엘지전자 주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes

Abstract

The present specification provides a method for transmitting a signal by an access point (AP) in a wireless LAN (WLAN) system and a device therefor. More particularly, the present specification provides a method for transmitting a signal by an AP or a station on the basis of channel bonding in a WLAN system and a device therefor.

Description

A signal transmission method and apparatus therefor in a wireless LAN system,

The following description is as to the signal transmission method in a mobile communication system, more particularly to a method for transmitting wireless local area network (WLAN) system signal to the access point or base station to a channel in the bonding and apparatus therefor.

Standards for wireless LAN technology is being developed as an 802.11 standard (Institute of Electrical and Electronics Engineers) IEEE. IEEE 802.11a and b is 2.4. GHz or using unlicensed bands (unlicensed band) at 5 GHz and, IEEE 802.11b provides a transmission rate of 11 Mbps, and IEEE 802.11a provides a transmission rate of 54 Mbps. IEEE 802.11g by applying OFDM (Orthogonal frequency-division multiplexing, OFDM) in the 2.4 GHz, and provides a data rate of 54 Mbps. IEEE 802.11n is applied to a MIMO OFDM (multiple input multiple output-OFDM, MIMO-OFDM), it provides a data rate of 300 Mbps for the four spatial streams (spatial stream). In the IEEE 802.11n supports a channel bandwidth (channel bandwidth) up to 40 MHz, and in this case, provides a transmission rate of 600 Mbps.

A wireless LAN standard is described supports eight spatial streams, using a bandwidth up to 160MHz via the IEEE 802.11ac standard which supports speeds of up to 1Gbit / s, a discussion on the IEEE 802.11ax standardized have been made.

On the other hand, has been defined to improve performance for high-speed throughput of the 60 GHz band in IEEE 802.11ad, a discussion on the IEEE 802.11ay have been made for the introduction of the first channel bonding and MIMO techniques such IEEE 802.11ad system.

Data transmission based on channel bonding is, it can be a new format PPDU (Physical Protocol Data Unit) in order to request them, while capable of providing high throughput.

In particular, given the OFDMA, the different bandwidth is allocated to each station may be required a method of transmitting and receiving data.

Existing legacy systems for the IEEE 802.11ay standardized as described above (for example, 11ad STA) research on the new PPDU format and a method and apparatus for transmitting them considering the compatibility has been required.

In one aspect of the present invention for solving the problems as described above in the method for transmitting and receiving signals to an access point (AP) is a station (STA) in a wireless local area network (WLAN) system, OFDMA (orthogonal frequency division multiple access) method assigning a plurality of resource unit (RU) to the plurality of STA and, but transmits a wireless frame via the RU is assigned to each of the plurality of STA according to the to the STA plurality of RU is assigned to one of the plurality of STA when a radio frame transmission, the AP is offering the same tone mapping, the method of transmitting and receiving a signal for transmitting the radio frame by applying (tone mapping) method as in the case of channel bonding (bonding channel) as much as the multiple of the RU size.

In this case, the same tone as in the case of channel bonding a plurality of the RU size as the mapping method has a tone mapping method used by each other between the RU assigned to another STA area tone guard subcarriers (guard tone) may be used.

As another example, the plurality of RU some of the same tone mapping method in the case of channel bonding, as much as the size of each other sub-carriers between the RU assigned to another STA domain subcarriers to use in data tones (data tone), some other sub-carriers may be subject to a tone mapping method using the guard tone (guard tone).

On the other hand, the radio frame can include a first header field that contains information about the RU, respectively assigned to the plurality of STA.

Here, the first header field may be located before the STF (Short Training Field) field, or a CE (channel Estimation) field for multiple RU operation of the plurality of STA RU is assigned in the time domain.

On the other hand, the first header field may include information about the number of spatial streams (spatial stream) to be transmitted to each of the plurality of STA.

In addition, the radio frame where the second header field, and a second header field comprising a (modulation and coding scheme) MCS information for each of the STA said plurality are in the time domain after the first header field can do.

On the other hand, the scheduling information transmitted to each of the plurality of STA additional scheduling information, and may include allocation information for the OFDMA access period (Access Period).

Here, the scheduling information, when comprising a source AID (Association Identifier) ​​field and the Destination AID field, wherein the OFDMA access period of a downlink OFDMA access period, the Source AID field contains the AID of the AP the Destination AID field is EDMG (Enhanced Directional Multi-Gigabit) of the broadcast information or the case containing the AID of the specific STA, wherein the OFDMA access period of the uplink OFDMA access period, the source AID field the EDMG broadcast information or the specific STA AID AID field contains the destination and the may include AID of the AP.

On the other hand, the scheduling information may be transmitted via (Enhanced Multi-Directional Gigabit) beacon or announcement frame (Announcement Frame) within the extension Schedule Element (Extended Schedule element) EDMG.

On the other hand, in another embodiment of the present invention a method for a station (STA) is transmitting and receiving signals to an access point (AP) in a wireless local area network (WLAN) system, according to the OFDMA (orthogonal frequency division multiple access) method from the AP when receiving the allocation information of the plurality of resource units (RU) one or more resource unit, but receives a wireless frame via the RU allocated to the STA from the AP, the plurality of the RU to the STA is assigned, the STA is propose the same tone mapping, the signal transmitting and receiving method of receiving the wireless frame by applying (tone mapping) method as in the case of channel bonding (bonding channel) as much as the multiple of the RU size.

Here, the bandwidth above the (Fast Fourier Transform) size FFT in the AP is larger than the FFT size of the STA, the STA may repeat the feedback transmission of the bandwidth corresponding to its FFT size corresponding to the FFT size of the AP for it can perform a transmission feedback.

On the other hand, in another embodiment of the invention in the access point for transmitting and receiving signals in a wireless local area network (WLAN) system, transmission and reception unit; And it is connected to the transmitting and receiving unit, comprising the transmitting and receiving parts of the control processor, wherein the processor is allocated a plurality of resource unit (RU) according to the OFDMA (orthogonal frequency division multiple access) system to a plurality of stations (STA), and the processor is controlled to transmit the radio frame through the RU is assigned to each of the STA said plurality, and, when for the STA plurality of RU is assigned to one of the plurality of STA transmitted the wireless frame, the access point device of the plurality by applying the same tone mapping (tone mapping) method as in the case of channel bonding (bonding channel) by the RU size proposes an access point device for transmitting the wireless frame.

On the other hand, in another embodiment of the present invention, in a station device for transmitting and receiving signals in a wireless local area network (WLAN) system, transmission and reception unit; And is connected to the transceiver unit, the transceiver, but parts including a control processor, wherein the processor from an access point (AP) OFDMA (orthogonal frequency division multiple access) a plurality of resource units (RU) of one or more of the resource units in accordance with the method a control to receive the allocation information, and the processor when the but controlled to receive a radio frame from the RU allocated to the STA from the AP, the plurality of the RU to the STA is assigned, wherein the station apparatus in the RU the plurality proposes, station device receiving the wireless frame to apply the same tone mapping (tone mapping) method as in the case of channel bonding (bonding channel) as much as the size.

The present invention is to provide in supporting the OFDMA (orthogonal frequency division multiple access) in 11ay system, complaint method of transmitting and receiving via the at least one resource unit (resource unit) the channel received is allocated a frequency resource to a minimum unit, allocated to each STA there is an effect that it is possible.

Effects that can be obtained in the present invention is not limited to the effects mentioned above, are not mentioned other effects can be clearly understood to those of ordinary skill in the art from the following description will be.

The accompanying drawings herein are intended to represent various embodiments of the present invention serves to provide an understanding of the present invention illustrating the principles of the invention with a substrate of the disclosure.

1 is a view showing an example of configuration of a wireless LAN system.

2 is a view showing another example of the configuration of a wireless LAN system.

3 is a view for explaining a channel in a 60GHz band for channel bonding operation described in accordance with one embodiment of the invention.

Figure 4 is a view illustrating a basic method for performing channel bonding in a wireless LAN system.

5 is a view for explaining a configuration of a beacon interval.

Figure 6 is a view illustrating a physical configuration of a conventional radio frame.

7 and 8 are diagrams for illustrating a configuration of the header fields of the radio frame of FIG.

9 is a diagram showing a possible PPDU structure applicable to the present invention.

10 and 11 are a diagram showing a PPDU format for OFDMA in accordance with the present invention.

12 is a view showing a tone mapping (tone mapping) in accordance with the present invention.

13 is a view showing a scheduling-based signaling structure of the present invention.

14 is a diagram comparing the system characteristics according to the RU size for OFDMA.

15 is a diagram comparing the system characteristics according to the FFT size of the PCP / AP and the STA.

16 is a view for explaining an apparatus for implementing the method as described above.

With reference to the accompanying drawings a preferred embodiment according to the present invention will be described in detail. Detailed description will be given below with reference to the accompanying drawings, it is intended to explain exemplary embodiments of the present invention, rather than to show the only embodiments in which the invention may be practiced.

The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art knows that it can be practiced without these specific detail about the present invention. In some cases, in order to avoid becoming a concept of the present invention ambiguous, structures and devices are omitted or known, and each structure is shown in the form a block around the core functionality of the device.

But may be present as a mobile communication system to which the present invention is applied it is varied, the following description will be described in detail a wireless LAN system as an example of a mobile communication system.

1 is a view showing an example of configuration of a wireless LAN system.

1, the wireless LAN system comprises one or more basic service set (Basic Service Set, BSS). BSS is a set of successful station (Station, STA) in yirueoseo synchronization to communicate with each other.

The STA MAC (Medium Access Control, MAC) and physical layer of the wireless medium (Physical Layer) as a logical entity that contains the interfaces, access points (access point, AP) and a non-AP STA (Non-AP Station) to It includes. A portable terminal that the user operates from the STA shall also refer to the Non-AP STA When called, simply STA as a Non-AP STA. Non-AP STA is a terminal (terminal), wireless transmit receive unit (Wireless Transmit / Receive Unit, WTRU), user equipment (User Equipment, UE), mobile station (Mobile Station, MS), mobile terminals (Mobile Terminal), or mobile subscriber It may also be referred to by other names, such as unit (Mobile Subscriber unit).

And, AP has to the object to provide a connection to the distribution system (Distribution System, DS) over the wireless medium a STA (Station Associated) coupled to it. AP may be referred to as a focus controller, a base station (Base Station, BS), Node-B, BTS (Base Transceiver System), PCP / AP (personal basic service set central point / access point), or site controller, and the like.

BSS can be classified into infrastructure (infrastructure) and an independent BSS (Independent) BSS (IBSS).

The BBS shown in Figure 1 is an IBSS. IBSS refers to a BSS which does not include the AP, and does not include the AP, because the connection to the DS is not allowed to form self-complete enemy network (self-contained network).

2 is a view showing another example of the configuration of a wireless LAN system.

The BSS shown in Figure 2 is an infrastructure BSS. Infrastructure BSS includes one or more of the STA and the AP. If the infrastructure BSS of communication between non-AP STA is set to the direct link (link) between the principle or a non-AP STA formed by way of the AP, it is possible to provide direct communication between non-AP STA.

A plurality of infrastructure BSS as shown in Figure 2 may be interconnected via a DS. Set a plurality of services connected via the BSS extended DS is referred to as (Extended Service Set, ESS). STA contained in the ESS can communicate with each other, the non-AP STA in the same ESS can move from one BSS to another BSS while communicating without interruption.

DS is a mechanism (mechanism) for connecting a plurality of the AP, the network does not necessarily need to be, if possible to provide a predetermined distribution service there is no limitation on its shape. For example, DS may be a wireless network such as a mesh (mesh) network, may be a physical structure that connects together the AP.

Based on the above will be described in the channel bonding system in a wireless LAN system.

3 is a view for explaining a channel in a 60GHz band for channel bonding operation described in accordance with one embodiment of the invention.

In FIG 60GHz band, as shown in the third and the four channels can be configured, general channel bandwidth may be 2.16GHz. ISM-band (57 GHz ~ 66 GHz) available in the 60 GHz may be defined differently according to each country conditions. In general, channel 2 of the channel shown in Figure 3 can be used as the default channel to be available in all areas. You can use the channel 2 and channel 3 on most noted exception of Australia, we can take it to the channel bonding. However, channels that are used in channel bonding can vary, the invention is not limited to a particular channel.

Figure 4 is a view illustrating a basic method for performing channel bonding in a wireless LAN system.

An example of Figure 4 will be described, for example, to operate the two bonding a 20MHz channel and 40 MHz channel bonding in the IEEE 802.11n systems. For the IEEE 802.11ac system will be the 40/80/160 MHz channel bonding.

The exemplary two channels of the four, including the primary channel (Primary Channel) and a secondary channel (Secondary Channel), STA may review the channel state by CSMA / CA scheme for the main channel of the two channels. If the primary channel at the time of idle (idle) to a back-off count is zero for a certain amount of back-off interval (backoff interval), the secondary channel is idle for a predetermined time (e.g., PIFS), STA is the primary channel, and by combining the secondary channel may transmit data.

However, as shown in FIG. 4, when performing a channel bonding into a contention-based to be a channel bonding only when being kept in a idle for a back-off the supplemental channel at the point when the count has expired, a predetermined time for the main channel as described above, since this is the use of channel bonding is very limited, it is difficult to flexibly respond to the circumstances medium side.

Thus, in one aspect of the invention according proposes a scheme for transmitting the scheduling information to the AP to the STA performs a connection to the scheduling-based. On the other hand, in another aspect of the invention proposes a scheme for carrying out the scheduling on the basis of the above-mentioned or described scheduling and independently connected to a contention-based channel. In addition, in another aspect of the invention proposes for a method for performing communication based on beam forming (beamforming) through the shared space (Spatial Sharing) techniques.

5 is a view for explaining a configuration of a beacon interval.

Time of the medium in 11ad based DMG BSS system can be divided into a beacon interval. Sub-interval within the beacon interval may be referred to as access period (Access Period). Different access period within one beacon interval may have different access rules. In about the same period is up can be sent to a non-AP STA or non-PCP by the AP or (Personal basic service set Control Point) PCP.

One of the beacon interval as in the example shown in Figure 5 may include one of BHI (Header Beacon Interval) and one (Data Transfer Interval) DTI. BHI may include a BTI (Beacon Transmission Interval), A-BFT (Association Beamforming Training) and ATI (Announcement Transmission Interval), as shown in Fig.

BTI means a period during which one or more of the DMG beacon frame may be transmitted. A-BFT means a period in which the beamforming training is performed by sending the beacon frame during the preceding BTI that DMG STA. ATI requests between the PCP / AP and non-PCP / non-AP STA - means the management connection interval of the response-based.

On the other hand, as the region formed of a frame exchange between STA (Data Transfer Interval) DTI, there may be assigned one or more CBAP (Contention Based Access Period) and (Service Period) one or more of SP, as shown in FIG. In Figure 5, but shows two CBAP and second example in which the allocation of SP, which is not necessarily limited to this as illustrative.

Hereinafter, specifically at about the physical layer configuration in a radio LAN system to which the present invention is applied.

The wireless LAN system according to an embodiment of the invention it is assumed that it can provide three different modulation modes, including:

PHY MCS note
Control PHY 0
Single carrier PHY (SC PHY) 1 ... 1225 ... 31 (Low power SC PHY)
OFDM PHY 13 ... 24

This modulation mode can be used to meet the different requirements of each other (e. G., High throughput or stability). It can only support some of these modes, depending on your system.

Figure 6 is a view illustrating a physical configuration of a conventional radio frame.

All DMG (Directional Multi-Gigabit) physical layer it is assumed that common to the fields as shown in FIG. However, it is possible to have a difference in the modulation / coding scheme to be specified how the individual fields and used in accordance with the respective modes.

The preamble of the radio frame as shown in Figure 6 may include an STF (Short Training Field), and CE (Channel Estimation). The radio frame may comprise a TRN (Training) field for a data field and an optional beam forming with a header, and a payload.

7 and 8 are diagrams for illustrating a configuration of the header fields of the radio frame of FIG.

Specifically, Figure 7 shows a case in which using a SC (Single Carrier) mode, in the SC mode, header information indicating the initial value of scrambling, the information indicating the length of the (Modulation and Coding Scheme) MCS, data, additional PPDU if (Physical Protocol Data Unit) presence information indicating whether the packet type, the training length, Aggregation of the beam frame innings request or not, the final RSSI (Received Signal Strenth Indicator), cutting (truncation) or not, HCS (Header Check Sequence) It may include information such as. In addition, the header, as shown in Fig. 7 has a reservation of the 4-bit bit (reserved bits) and, in the following description, this may also take advantage of the same reserved bit.

8 is a flowchart illustrating a specific configuration of the header in the case where the OFDM mode is applied. Whether OFDM header or failure information indicating the length of information, MCS, data representing an initial value of scrambling, the information indicating the presence or absence of additional PPDU, a packet type, the training length, Aggregation, beam whether pre innings request, the last RSSI, cutting, HCS may include information such as (Header Check Sequence). In addition, the header, as shown in Fig. 8 may utilize the reserved bits in the same and have the reserved bit of two bits, the following description, as in the case of Figure 7. The.

IEEE 802.11ay system as described above is considering first introduced in the channel bonding and MIMO techniques to an existing system 11ad. The new PPDU structure is required to implement the channel bonding and MIMO in 11ay. That is, the existing 11ad PPDU structure has a limitation in implementing the channel bonding and MIMO at the same time supports the legacy terminals.

You can define a new field for the terminal 11ay legacy preamble, legacy header followed by a field for supporting a legacy terminal for this purpose, and can support the channel bonding and MIMO through a field newly defined here.

9 is a view showing a PPDU structure according to a preferred embodiment of the present invention. In Figure 9 the horizontal axis may correspond to the vertical axis is the frequency domain to the time domain.

When bonding the two or more channels, a frequency band used in each channel: between (for example, 1.83GHz), the frequency band of a predetermined size: may be present (for example, 400MHz band). For Mixed mode, through a respective channel a legacy preamble: is transmitted to the (legacy STF, legacy CE) it is duplicate, one embodiment, at the same time new STF with the legacy preamble through the 400MHz band between each channel of the present invention and It can be considered a transmission (gap filling) of the CE field.

In this case, as shown in Fig. 9, PPDU structure according to the present invention ay STF, ay CE, ay header B, a payload (payload) of the legacy preamble, transmitting the wideband after legacy header and ay header A of the form. Thus, the header field and header ay, ay Payload field is sent to the like can be transmitted through the channel used in bonding. Or less, and the header ay also be named as EDMG (enhanced directional multi-gigabit) header to distinguish it from the legacy header, the name may be used interchangeably.

For example, 11ay is because there are four channels (each 2.16 GHz) ay ay Payload header and may transmit through the 2.16GHz, 4.32GHz, 6.48GHz, 8.64GHz bandwidth.

Alternatively, without performing the Gap-Filling the above-described format of the PPDU when transmitting repeatedly a legacy preamble may also be considered.

In this case, the broadband Gap-Filling do not even 8 without the GF-STF and GF-CE field shown by a broken line ay STF, ay CE and ay header not a B to a legacy preamble, after legacy header and ay header A It has a transmission format that.

Based on the information as described above, in the present invention, each propose a different channel bonding capability (channel bonding capability) are STA method (Orthogonal Frequency Division Multiple Access) OFDMA of transmitting data at the same time with the method. In this case, the assumption for the application of the OFDMA method can be applied to the following:

- OFDMA RU (resource unit) unit may be set or a channel unit (2.16GHz) 11ay of the system, to be smaller than the channel unit (2.16GHz).

- 11ay systems have their own channel bonding ability can be different for each 11ay STA. Or 11ay STA participating in the OFDMA may be equal to the FFT size of the PCP / AP.

PPDU format for OFDMA

10 and 11 are a diagram showing a PPDU format for OFDMA in accordance with the present invention. If specifically, Figure 10 is a diagram showing the PPDU format for a case where a single-channel assignment (if it does not contain a channel bonding) OFDMA to each STA, 11 is assigned a plurality of channels to the particular STA ( If a channel bonding is a diagram illustrating a format for PPDU) OFDMA.

10 and may be as shown in Figure 11, PCP / AP is the same as or different from the assigned assignment to RU size to each STA. Each STA may transmit data in the OFDMA system using the channel as long as a maximum corresponds to the own channel bonding ability. Thus, the RU size can be variously modified from the bandwidth corresponding to one channel to the bandwidth corresponding to six channels. Or, even if the primary RU size is set smaller than the bandwidth of one channel, the RU size can be variously modified to the bandwidth of up to six channels.

10 and as shown in the PPDU format shown in Figure 11, the sub-carriers in between the channel corresponding to the RU allocation to each STA may be used as guard tones (guard tone). Further, when OFDMA transmission, the subcarriers may send signaling (nulling).

Tone mapping (Tone mapping)

In one possible example applicable to the present invention, when a plurality of the RU to the specific STA is assigned (or if the RU size assigned to a particular STA bandwidth corresponding to when bonding a plurality of channels), PCP / AP is the particular STA to apply the same tone mapping (tone mapping) method as in the case of channel bonding, as long as the plurality of channels to transmit the PPDU format. For example, if the bandwidth corresponding to the case where the the RU size assigned to a particular STA bonding the two channels, PCP / AP may transmit a PPDU format to the particular STA by applying the tone mapping methods such as two-channel bonding . In other words, PCP / AP is the tone mapping method of the second channel bonding can reuse (reuse) send a signal to the particular STA.

At this time, the tone mapping method, such as a plurality of channel bonding, using a subcarrier of a RU between the area assigned to a different STA a data tone, some other sub-carriers may comprise a tone mapping method using the guard tone. That is, when the PCP / AP to transmit a signal according to the OFDMA method to the same RU as the bandwidth of as much as a predetermined number of channels allocated STA, the PCP / AP tone mapping method of channel bonding a by channel of the predetermined number and all of the subcarriers between the same channel and channel use by a guard tone, or some of which can be used in data tones.

12 is a view showing a tone mapping (tone mapping) in accordance with the present invention. Figure 12 shows a case of applying the tone mapping of the OFDM PHY that is defined in, 11ad system to the drawing, which presents a bandwidth corresponding to two channels.

When applying the OFDMA method, as set forth in the invention tone (tone) to the each STA allocated may be subject to a tone mapping configured to DC is located at the center.

As shown in Figure 12, CH1 is allocated to the STA 1, CH2 is the sub-carriers are allocated to the STA 2, for the 0.33GHz is located therebetween (or tone) may be used as guard tones. This can mitigate the interference coming from the adjacent sub-carriers over.

Or, in between a channel allocated to each STA subcarriers of the subcarriers used as guard tones it can be determined to vary within 0.33GHz.

Signaling (Signaling)

A header 1. EDMG

EDMG A header may be sent in clone mode (duplicate mode) through the channels used in OFDMA.

PCP / AP may provide the RU information allocated to each STA through EDMG A header of the PPDU format. In other words, EDMG A header of the PPDU format may include the RU information allocated to each STA.

Each STA involved in the OFDMA may be through the main channels (primary channel) set up by the system decodes the header A EDMG seen the RU assigned to them.

10 and as shown in Figure 11, EDMG header A can be located before (Short Training Field) STF for multiple RU operation of the plurality of RU assigned STA field or CE (channel Estimation) field in the time domain is. Thereby, each STA may obtain the information included in the header EDMG A before performing a multi-channel operation.

EDMG A header may include the following fields as RU allocation field for each STA.

Field Bits Description
RU allocation (STA 1) AID or Partial AID TBD
RU allocation allocated RU size (unit of channel bandwidth)
Number of SS
RU allocation (STA 2) AID or Partial AID
RU allocation allocated RU size (unit of channel bandwidth)
Number of SS
RU allocation (STA 3) AID or Partial AID
RU allocation allocated RU size (unit of channel bandwidth)
Number of SS
RU allocation (STA 4) AID or Partial AID
RU allocation allocated RU size (unit of channel bandwidth)
Number of SS

(TBD: To Be Determined)

PCP / AP according to the present invention may support up to six STA according to the OFDMA scheme. Or if the PCP / AP is the number of channel bonding channels is less than the six, the PCP / AP may support the STA as the maximum number of channels available channel bonding.

Table 2 may be used for each STA AID information instead of the group ID information that contains each of the STA according to the embodiment, but showing an example of applying the AID information of each STA,.

In addition, considering a MIMO (multi input multi output) and OFDMA at the same time, through a number of spatial streams (Number of SS) field may provide information about the number of streams to be transmitted to each STA. In other words, EDMG A header may include information about the number of spatial streams to be sent to each STA (spatial stream).

Or it includes multiple AID subfield on RU allocation (allocation) field in Table 2 and may support MU-MIMO OFDMA by defining a number of spatial streams (Number of SS) to the sub-field in it.

RU allocation fields of Table 2 may be configured as follows.

Field Name Number of bits Description
RU (bandwidth) 2 0: 2.15GHz (signle channel) 1: 4.32GHz (2 channel bonding) 2: 6.48GHz (3 channel bonding) 3: 8.64GHz (4 channel bonding)

Field Name Number of bits Description
RU (channel) 3 0: signle channel1: 2 channel bonding (CH1, CH2) 2: 2 channel bonding (CH2, CH3) 3: 2 channel bonding (CH3, CH4) 4: 3 channel bonding (CH1, CH2, CH3) 5: 3 channel bonding (CH2, CH3, CH4) 6: 4 channel bonding (CH1, CH2, CH3, CH4) 7: reserved

Field Name Number of bits Description
STA [i] RU 3 i: ith STA0: primary channel1: 2 channel bonding (primary channel + secondary channel 1) 2: 2 channel bonding (primary channel + secondary channel 2) 3: 2 channel bonding (primary channel + secondary channel 3) 4: 3 channel bonding (primary + secondary channel channels 1,2) 5: 3 channel bonding (primary + secondary channel channels 1,3) 6: 3 channel bonding (primary + secondary channel channels 2,3) 7: 4 channel bonding (primary + secondary channel channels 1,2,3) 0: reserved

Field Name Number of bits Description
RU (chanel) 3 0: CH11: CH22: CH33: CH44: 2 channel bonding (CH1, CH2) 5: 2 channel bonding (CH2, CH3) 6: 2 channel bonding (CH3, CH4) 7: reserved

Field Name Number of bits Description
RU (chanel) 4 0: CH11: CH22: CH33: CH44: 2 channel bonding (CH1, CH2) 5: 2 channel bonding (CH2, CH3) 6: 2 channel bonding (CH3, CH4) 7: 2 channel bonding (CH1, CH3): aggregation8 : 2 channel bonding (CH1, CH4): aggregation9: 2 channel bonding (CH2, CH4): aggregation10: 3 channel bonding (CH1, CH2, CH3) 11: 3 channel bonding (CH2, CH3, CH4) 12: 4 channel bonding (CH1, CH2, CH3, CH4) 13 ~ 15: reserved

2. EDMG header B

B EDMG header includes a specific (specific) information device. In other words, PCP / AP may provide the specific information for each specific STA through the header EDMDG B.

At this time, header EDMG B may include the following information:

- length (length). For example, it is possible to length (length) reuse (reuse) the information in the legacy header to tell a differential (differential).

- MCS (Modulation and Coding Scheme). For example, it is possible to length (length) reuse (reuse) the information in the legacy header to tell a differential (differential).

- CP length

- Etc

When the length of the header EDMG A to 2 symbols, or the MCS set larger degree (order), it is possible to the information contained in the header B EDMG all included in the header EDMG A. In this case, 11ay OFDMA PPDU format may be a EDMG header B is omitted.

Such EDMG header B may be located after, PPDU format EDMG header in the time domain A, as shown in FIGS.

Scheduling (Scheduling)

PCP / AP and the STA is a management frame (a beacon frame, between the frame (association frame), etc.) PCP / AP and the (non-PCP / AP) STA in the channel bonding capability through the body, including EDMG capacity element (EDMG capabilities element) It may direct. To this end, EDMG capability element may comprise a set of channel width (channel width set supported) field indicative of a channel supporting the bonding ability of the PCP / AP and the STA.

Further, PCP / AP and STA may define a new field within the ability EDMG element indicating a capability (capability) for MIMO (multi input multi output) and OFDMA.

Beacon in the frame body or announcement frame body (announce frame body) of the conventional system 11ad is defined to extend Schedule Element (extended schedule element). Figure 13 shows a configuration in which the expansion scheduled signaling element via configuration and beacon of the extension Schedule Element. As shown in Figure 13, PCP / AP may be to the STA through the expansion element assigned to the scheduled channel access (access channel) and methods of CBAP SP interval in DTI interval.

PCP / AP or STA may support OFDMA using the AID source and destination (destination) of the AID expansion Schedule Element. More specifically, the AID may indicate whether the source and destination supports constituted by the predetermined length of the allocation period for the OFDMA downlink or uplink that supports OFDMA as shown in the table below AID.

Source AID Destination AID Description
PCP / AP EDMG Broadcast Downlink OFDMA
Intended STAs
EDMG Broadcast PCP / AP Uplink OFDMA (trigger frame needs to be defined newly)
Intended STAs

In Table EDMG Broadcast refers to the broadcast signal that targets the only possible 11ay STA supports OFDMA, and is Intended STAs means a specific STA is selected.

Through the signaling described above, only channel connected STA that supports OFDMA (channel access) STA does enable and not support OFDMA (For example, the legacy STA) have power for a period of time that is allocated by the signaling, such as the It can operate in a sleep mode to reduce consumption.

In addition, no PCP / AP STA may also between the transmit and receive signals by applying the OFDMA method. For example, STA, with a capacity to transmit a signal to the OFDMA may be designated as the source of expansion AID Schedule Element (P2M (Peer-to-Machine), etc.).

Further, the STA may specify the Intended mentioned above individually. In Figure # 1 ~ #n shown in the Allocation Source AID 13 AID or destination can be specified as one STA. At this time, each allocation field (Allocation #n) within the assigned start (Allocation Start), assigned block interval (Block Allocation Duration), the block number (Number of Blocks), allocation block period (Block Allocation Period) in time channel access period by using the a may be scheduled to overlap.

In another example, using a group ID that is not EDMG Broadcast and Intended STA can specify the source or destination AID AID.

OFDMA method can be applied only in interval SP, it may be applied only CBAP interval. Or, it may be applied to both the SP and CBAP interval.

To be newly defined trigger frame to support an uplink OFDMA, as noted in the table, it said trigger frame can be of a control PHY mode (PHY mode control).

Channel access (access channel) for the OFDMA scheme

The allocation control field is shown in Figure 13 (-> allocate #n - Extended Schedule Element> allocation control field) contains an allocation type (allocation type) sub-field. At this time, PCP / AP and the STA can indicate that the "OFDMA assigned" or the like through the assigned type subfield within the reserve (reserved) bits. Through this, it is possible to use the channel access scheme in the OFDMA period DTI only.

At this time, EDMG Broadcast is the Broadcast supported by existing systems without the need to be redefined can reuse (reuse). Because, in the STA in the signaling "OFDMA allocation" it can be decoded because there is only be 11ay STA proposed by the present invention.

A further example, it may be directed through the AID set that the operation OFDMA uplink OFDMA or OFDMA downlink recognized as shown in Table 8 along with the 'OFDMA allocation, signaling.

The proposed OFDMA Schemes (schemes)

1. The size of the sub-bands (granularity)

14 is a view showing a result of comparing the case where the RU size one channel bandwidth (hereinafter referred to as first case) and is smaller than one channel bandwidth (hereinafter referred to as second case).

As it is shown in Figure 14, assuming the total number of channels supported by the system to four, the first case in the can at the same time to transmit signals into up to four STA, a second case, at the same time the signal into eight STA to be transferred.

In terms of signaling overhead, the second case may have the greater the number of the first case compared to a lot of bar support STA, STA possible signaling and scheduling overhead increase. In particular, in the second case if the quality (fine) frequency scheduling, may be difficult to expect a higher gain.

In the feedback overhead side, a second case is a coherent (coherent) bandwidth is linear with the number of EHF (Extremely High Frequency) characteristic, but can be greater, the total watching time (total reporting time) by the supporting STA enemy It can be increased.

In effect (impact) side of a frame structure, the first case can be re-used for MU-MIMO frame structure of prior art systems. However, in the second case it is necessary to optimize the frame structure for the OFDMA newly defined.

In terms of complexity (compexity), the first case the parameter for the prior art system and channel bonding 11ad: The most reusable (for example, the encoding block size, tone mapping, and so on). However, in the second case it is necessary to encode the block size for each RU scheduled to be newly defined. In other words, in the second case it can be an increase in hardware complexity.

2. FFT size of the receiver

15 is a view comparing a case in which the FFT size of the PCP / AP and STA same (hereinafter, a third case) and a different case (hereinafter, a fourth case).

Third, while in the case only the STA has the same FFT size and the FFT size of the PCP / AP can participate in the OFDMA, the fourth case, the STA can also participate in the OFDMA with FFT size different from the FFT size of the PCP / AP.

In the feedback side, the third case can report the channel state information (channel state information) for all frequencies at least one STA are used for one at a time (at a time) OFDMA transmission. On the other hand, the above 1-4 case STA can report only the channel state information for the partial frequencies as FFT size of itself (at a time) at a time. Therefore, in order to report on all of the channels it may be time-consuming than the third case.

The STA participating in OFDMA Feedback Method at which the FFT size different from the PCP / AP

As shown in Figure 15 in the fourth case, the FFT size of the STA to join the OFDMA may be varied, so that the FFT size of the STA may be less than the FFT size for use in a PCP / AP transmits a PPDU. Therefore, STA may be able to feedback information about the channel to be used for the PCP / AP transmits a signal at a time.

Thus, STA according to the present invention may feed back the channel status information to PCP / AP in the following ways.

For example, STA may perform feedback on the channel PCP / AP is used for the PPDU transmitted over a multiple times. That is, STA may perform feedback on the bandwidth for the PCP / AP of the FFT size by performing several times the bandwidth of the back pad so as to correspond to their FFT size.

As another example, STA is to feed back the channel information on the channel to perform the decoding (preferably, the main channel (primary channel)) one time, and, PCP / AP is based on the characteristics of the high frequency band, the other channels is also the primary channel and similar to assume that one state can determine the status of the full channel bandwidth.

As another example, STA can increase the channel utilization by using a number of frequency resources as much as possible to reduce the overhead by scheduling the random (random scheduling) by the PCP / AP.

16 is a view for explaining an apparatus for implementing the method as described above.

The wireless device 800 of Figure 16 is the specific STA, and the radio device 850 in the above description can correspond to PCP / AP of the above description.

STA (800) includes a processor 810, memory 820, may comprise a transceiver (830), PCP / AP (850) includes a processor 860, memory 870, and transceiver 880 can do. Transmitting and receiving unit (830 and 880) may be performed in a physical layer, such as a radio signal received transmission / to, IEEE 802.11 / 3GPP. A processor (810 and 860) is connected and running on the physical layer and / or MAC layer, transmission and reception unit (830 and 880). A processor (810 and 860) may perform scheduling UL MU procedure referred to above.

A processor (810 and 860) and / or transceiver (830 and 880) may include an application specific integrated circuit (application-specific integrated circuit, ASIC), other chipset, logic circuit and / or data processors. A memory (820 and 870) may include a ROM (read-only memory), RAM (random access memory), flash memory, memory card, storage medium and / or other storage unit. An example of one embodiment, when executed by the software, the above-described method can be implemented as a module (e. G., Processes, functions and so on) that perform the functions described herein. The module may be stored in a memory (820, 870), and executed by a processor (810, 860). The memory (820, 870) may be connected to the process (810, 860) to the inside or can be disposed on the outside, a well-known means for the process (810, 860).

Detailed description of the preferred embodiments of the invention described as mentioned above is provided to enable those skilled in the art to implement and practice the invention. In the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will appreciate that there can be various modifications and changes to the present invention from the above description. Accordingly, the present invention is not intended to become limited to the embodiments shown herein, in which accorded the widest scope consistent with the principles and novel features disclosed herein.

The invention has been described on the assumption that applied to IEEE 802.11-based wireless LAN system, it is not necessary to be limited as described above. The present invention can be applied based on the channel bonding in the same way in a variety of wireless data transmission system is possible.

Claims (14)

  1. In a wireless local area network (WLAN) system, an access point (AP) is a method for transmitting and receiving signals to the station (STA),
    Assigning a plurality of resource unit (RU) according to the OFDMA (orthogonal frequency division multiple access) system to a plurality of STA, and
    But transmit a radio frame with the RU is assigned to each of the plurality of STA,
    When a plurality of the RU has been assigned STA of said plurality of STA transmitted the wireless frame, the AP is said to apply the same tone mapping (tone mapping) method as in the case of channel bonding (channel bonding) as much as the plurality of RU size , the signal transmitting and receiving method for transmitting a radio frame.
  2. According to claim 1,
    Same tone mapping method is another tone guard subcarriers between the RU assigned to another STA in the area, a method of transmitting and receiving a signal tone mapping method using the (guard tone) in the case of channel bonding by the plurality of the RU size.
  3. According to claim 1,
    The plurality of RU same tone mapping method in the case of channel bonding, as much as the size is part of each sub-carrier between the RU assigned to another STA domain subcarriers to use in data tones (data tone), some other sub-carrier is guard tone (guard tone) tone mapping method used, the method of transmitting and receiving a signal.
  4. According to claim 1,
    The radio frame, a method of transmitting and receiving a signal that includes a first header field that contains information about the RU, respectively assigned to the plurality of STA.
  5. 5. The method of claim 4,
    Wherein the first header field STF (Short Training Field) field or a CE, a method of transmitting and receiving a signal which is located before (channel Estimation) field for operation of the multi-RU of the plurality RU allocated in the time domain STA.
  6. 5. The method of claim 4,
    Wherein the first header field, a method of transmitting and receiving a signal containing information about the number of spatial streams (spatial stream) to be transmitted to each of the plurality of STA.
  7. 5. The method of claim 4,
    The radio frame includes a second header field comprising a (modulation and coding scheme) MCS information for each of the plurality of STA,
    Wherein the second header field, a method of transmitting and receiving a signal which is located after the first header field in the time domain.
  8. According to claim 1,
    To each of the plurality of STA and further transmits the scheduling information,
    The scheduling information is OFDMA access period, a method of transmitting and receiving a signal containing allocation information about the (Access Period).
  9. The method of claim 8,
    The scheduling information includes a source AID (Association Identifier) ​​field and the Destination AID field,
    When the OFDMA access period of a downlink OFDMA access period, the Source AID field and AID fields, and the destination includes the AID of the AP comprises an AID of EDMG (Enhanced Directional Multi-Gigabit) broadcast information or a specific STA,
    When the OFDMA access period of the uplink OFDMA access period, the Source AID field, a method of transmitting and receiving a signal that the EDMG broadcast information or contains the AID of the particular STA AID said destination field contains the AID of the AP.
  10. The method of claim 8,
    The scheduling information is EDMG (Enhanced Multi-Directional Gigabit) beacon or announcement frame (Announcement Frame), a method of transmitting and receiving a signal, transmitted via the expansion in Schedule Element (Extended Schedule element).
  11. Station (STA) in a wireless local area network (WLAN) system, a method for transmitting and receiving a signal to an access point (AP),
    Receiving assignment information from the AP OFDMA (orthogonal frequency division multiple access) one or more resource units of a plurality of resource unit (RU) in accordance with the method,
    But receiving a wireless frame via the RU allocated to the STA from the AP,
    If to the STA with a plurality of RU allocation, the STA has to apply the same tone mapping (tone mapping) method as in the case of channel bonding (channel bonding) as much as the plurality of RU size for receiving the radio frame, the transmit and receive signals Way.
  12. 12. The method of claim 11,
    Wherein when the (Fast Fourier Transform) size FFT in the AP is larger than the FFT size of the STA, the STA is feedback for the bandwidth by repeating the feedback transmission of the bandwidth corresponding to its FFT size corresponding to the FFT size of the AP , a method of transmitting and receiving a signal to perform the transmission.
  13. In the access point device for transmitting and receiving signals in a wireless local area network (WLAN) system,
    Transmitting and receiving unit; And
    Is connected to the transmitting and receiving unit, comprising: a section for receiving and sending the control processor,
    Wherein the processor is assigned to a plurality of stations (STA) a plurality of resource unit (RU) according to the OFDMA (orthogonal frequency division multiple access) method,
    Wherein the processor is configured to control to transmit a radio frame with the RU is assigned to each of the plurality of STA,
    The plurality during a plurality of the wireless frame to the assigned STA RU transmission of the STA, the access point device is to apply the same tone mapping (tone mapping) method as in the case of channel bonding (channel bonding) as much as the plurality of RU size the access point device for transmitting the wireless frame.
  14. In the station device for transmitting and receiving signals in a wireless local area network (WLAN) system,
    Transmitting and receiving unit; And
    Is connected to the transmitting and receiving unit, comprising: a section for receiving and sending the control processor,
    Wherein the processor is configured to control to receive the allocation information of one or more resource units of a plurality of resource unit (RU) according to the OFDMA (orthogonal frequency division multiple access) scheme from the access point (AP),
    Wherein the processor is to receive control, but a radio frame via the RU allocated to the STA from the AP,
    If to the STA with a plurality of RU allocation, wherein the station apparatus includes a station for receiving the radio frame to apply the same tone mapping (tone mapping) method as in the case of channel bonding (channel bonding) as much as the plurality of RU size Device.
PCT/KR2016/010158 2015-09-11 2016-09-09 Method for transmitting signal in wireless lan system and device therefor WO2017043912A1 (en)

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