WO2017043911A1

WO2017043911A1 - Operation method in wireless lan system and apparatus therefor

Info

Publication number: WO2017043911A1
Application number: PCT/KR2016/010156
Authority: WO
Inventors: 박성진; 김진민; 조한규; 조경태; 박은성
Original assignee: 엘지전자 주식회사
Priority date: 2015-09-11
Filing date: 2016-09-09
Publication date: 2017-03-16

Abstract

The present specification relates to an operation configuration of a station and an access point in a wireless LAN (WLAN) system. More particularly, disclosed are a method for operating a station or an access point in a wireless LAN system and an apparatus therefor. In particular, the present specification suggests an operation method for supporting a multi-channel operation of a station and an access point, and an apparatus therefor.

Description

Operation method in wireless LAN system and apparatus therefor

The following description relates to an operation configuration of a station and an access point in a WLAN system, and more particularly, a method and an apparatus for operating the station or access point in a WLAN system.

The standard for WLAN technology is being developed as an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. 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.

Meanwhile, IEEE 802.11ad defines performance enhancement for ultra-high throughput in the 60 GHz band, and IEEE 802.11ay for channel bonding and MIMO technology is introduced for the first time in the IEEE 802.11ad system.

If a specific station (STA) is allocated a channel other than the primary channel on the system, it may be required to designate a channel available to the specific STA as the primary channel during the period in which the other channel is allocated.

In particular, research on a BSS formation method considering compatibility with an existing legacy system (eg, 11ad STA) is required.

In an aspect of the present invention for solving the above problems, in the method of operating a first station (STA) in a WLAN system, from the access point (AP) through a first primary channel (primary channel) Receives allocation information for one or more channels, and if the first primary channel is not included in the one or more channels, receives information designating one of the one or more channels as the second primary channel from the AP. The first STA proposes a method for operating in a WLAN system using the second primary channel as a primary channel during a period in which the at least one channel is allocated.

When the at least one channel is a plurality of channels, the first STA may combine the plurality of channels based on the second primary channel and transmit data to a second STA.

Meanwhile, the allocation information about the one or more channels and the information on the second primary channel may be received through an enhanced directional multi-gigabit (EDMG) beacon or an announcement frame.

Meanwhile, when the one or more channels are allocated includes a contention based access period (CBAP) or a service period (SP), and the one or more channels are allocated, the interval is assigned to the CBAP. The first STA may perform backoff or frame decoding through the second primary channel.

Meanwhile, the allocation information about the one or more channels and the information about the second primary channel may be transmitted through an extended schedule element in an enhanced directional multi-gigabit (EDMG) beacon or an announcement frame. have.

Here, the extended schedule element may include an allocation control field, and the allocation control field may include information on the second primary channel and bandwidth information allocated to the first STA.

In addition, the first STA may additionally transmit information on whether the first STA can access a channel other than the first primary channel during a data transfer interval (DTI).

On the other hand, when the interval in which the at least one channel is allocated ends, the first STA may use the first main channel as the main channel instead of the second main channel.

Alternatively, when receiving a beacon frame instructing to use the first main channel as a main channel from the AP after data transmission to the second STA, the first STA uses the first main channel instead of the second main channel. Can be used as the primary channel.

Alternatively, when data transmission to the second STA is completed, the first STA may immediately use the first primary channel as the primary channel instead of the second primary channel.

Meanwhile, according to another embodiment of the present invention, in the method of operating an access point (AP) in a WLAN system, allocation information of one or more channels to a station (STA) via a first primary channel (primary channel) If the first primary channel is not included in the one or more channels, and transmits information indicating one of the one or more channels as a second primary channel to the STA, the AP is the STA The present invention provides a method of operating in a WLAN system that controls the second primary channel to be used as a primary channel during the period in which the at least one channel is allocated.

On the other hand, according to another embodiment of the present invention, a station apparatus operating in a WLAN system, comprising: a transceiver having one or more RF chains and configured to receive scheduling information from an access point (AP); And a processor connected to the transceiver, the processor configured to process scheduling information received by the transceiver, wherein the processor receives allocation information regarding one or more channels from an access point (AP) through a first primary channel. Control to receive, wherein the processor is configured to receive, from the AP, information specifying one channel of the one or more channels as a second primary channel when the first primary channel is not included in the one or more channels, The processor proposes a station apparatus that uses the second primary channel as a primary channel during the interval in which the one or more channels are allocated.

On the other hand, in another embodiment of the present invention, an access point device operating in a WLAN system, comprising: a transceiver having one or more RF chains and configured to receive scheduling information from an access point (AP); And a processor connected to the transceiver, the processor processing the scheduling information received by the transceiver, wherein the processor transmits allocation information for one or more channels to the station STA through a first primary channel. If the first primary channel is not included in the one or more channels, the processor controls the STA to transmit information designating one of the one or more channels as a second primary channel. The processor proposes an access point apparatus for controlling the STA to use the second primary channel as the primary channel during the interval in which the one or more channels are allocated.

According to the present invention, when a station (STA) is assigned one or more channels that do not include a primary channel on the system, the STA can be used as a primary channel during a period in which the one or more channels are allocated. By specifying this, multi-channel operation can be supported.

In particular, the STA according to the present invention may form a BSS by being compatible with a legacy STA (eg, 11 ad STA).

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings appended hereto are for the purpose of providing an understanding of the present invention and for illustrating various embodiments of the present invention and for describing the principles of the present invention in conjunction with the description thereof.

1 is a diagram illustrating an example of a configuration of a WLAN system.

2 is a diagram illustrating another example of a configuration of a WLAN system.

3 is a diagram for describing a channel in a 60 GHz band for explaining a channel bonding operation according to an embodiment of the present invention.

4 is a diagram illustrating a basic method of performing channel bonding in a WLAN system.

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

6 is a diagram for explaining a physical configuration of an existing radio frame.

7 and 8 are views for explaining the configuration of the header field of the radio frame of FIG.

9 illustrates a PPDU structure applicable to the present invention.

10 and 11 illustrate a multi channel operation according to the present invention.

12 is a diagram illustrating a signaling configuration according to an embodiment of the present invention.

13 is a diagram illustrating a scheduling-based signaling configuration according to another embodiment of the present invention.

14 to 16 illustrate a method of operating an access point and a station according to the present invention.

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

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced.

The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details. In some instances, well-known structures and devices are omitted or shown in block diagram form, centering on the core functions of each structure and device, in order to avoid obscuring the concepts of the present invention.

There may be various mobile communication systems to which the present invention is applied. Hereinafter, the WLAN system will be described in detail as an example of the mobile communication system.

1 is a diagram illustrating an example of a configuration of a WLAN system.

As shown in FIG. 1, the WLAN system includes one or more basic service sets (BSSs). A BSS is a set of stations (STAs) that can successfully synchronize and communicate with each other.

An STA is a logical entity that includes a medium access control (MAC) and a physical layer interface to a wireless medium. The STA is an access point (AP) and a non-AP STA (Non-AP Station). Include. The portable terminal operated by the user among the STAs is a non-AP STA, and when referred to simply as an STA, it may also refer to a non-AP STA. A non-AP STA may be a terminal, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile terminal, or a mobile subscriber. It may also be called another name such as a mobile subscriber unit.

The AP is an entity that provides an associated station (STA) coupled to the AP to access a distribution system (DS) through a wireless medium. The AP may be called a centralized controller, a base station (BS), a Node-B, a base transceiver system (BTS), a personal basic service set central point / access point (PCP / AP), or a site controller.

BSS can be divided into infrastructure BSS and Independent BSS (IBSS).

The BBS shown in FIG. 1 is an IBSS. The IBSS means a BSS that does not include an AP. Since the IBSS does not include an AP, access to the DS is not allowed, thereby forming a self-contained network.

The BSS shown in FIG. 2 is an infrastructure BSS. Infrastructure BSS includes one or more STAs and APs. In the infrastructure BSS, communication between non-AP STAs is performed via an AP. However, when a direct link is established between non-AP STAs, direct communication between non-AP STAs is also possible.

As shown in FIG. 2, a plurality of infrastructure BSSs may be interconnected through a DS. A plurality of BSSs connected through a DS is called an extended service set (ESS). STAs included in the ESS may communicate with each other, and a non-AP STA may move from one BSS to another BSS while communicating seamlessly within the same ESS.

The DS is a mechanism for connecting a plurality of APs. The DS is not necessarily a network, and there is no limitation on the form if it can provide a predetermined distribution service. For example, the DS may be a wireless network such as a mesh network or a physical structure that connects APs to each other.

Based on the above, the channel bonding method in the WLAN system will be described.

As shown in FIG. 3, four channels may be configured in the 60 GHz band, and a general channel bandwidth may be 2.16 GHz. The ISM bands available from 60 GHz (57 GHz to 66 GHz) may be defined differently in different countries. In general, channel 2 of the channels shown in FIG. 3 may be used in all regions and may be used as a default channel.

Channels

2 and 3 can be used in most of the designations except Australia, which can be used for channel bonding. However, a channel used for channel bonding may vary, and the present invention is not limited to a specific channel.

The example of FIG. 4 illustrates the operation of 40 MHz channel bonding by combining two 20 MHz channels in an IEEE 802.11n system. For IEEE 802.11ac systems, 40/80/160 MHz channel bonding will be possible.

The two exemplary channels of FIG. 4 include a primary channel and a secondary channel, so that the STA may examine the channel state in a CSMA / CA manner for the primary channel of the two channels. If the secondary channel is idle for a predetermined time (e.g. PIFS) at the time when the primary channel idles for a constant backoff interval and the backoff count becomes zero, the STA is assigned to the primary channel and Auxiliary channels can be combined to transmit data.

However, when channel bonding is performed based on contention as illustrated in FIG. 4, channel bonding may be performed only when the auxiliary channel is idle for a predetermined time at the time when the backoff count for the primary channel expires. Therefore, the use of channel bonding is very limited, and it is difficult to flexibly respond to the media situation.

Accordingly, an aspect of the present invention proposes a method in which an AP transmits scheduling information to STAs to perform access on a scheduling basis. Meanwhile, another aspect of the present invention proposes a method of performing channel access based on the above-described scheduling or on a contention-based basis independently of the above-described scheduling. In addition, another aspect of the present invention proposes a method for performing communication through a spatial sharing technique based on beamforming.

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

In an 11ad based DMG BSS system, the time of the medium may be divided into beacon intervals. Lower periods within the beacon interval may be referred to as an access period. Different connection intervals within one beacon interval may have different access rules. The information about the access interval may be transmitted to the non-AP STA or the non-PCP by an AP or a personal basic service set control point (PCP).

As shown in FIG. 5, one beacon interval may include one beacon header interval (BHI) and one data transfer interval (DTI). As shown in FIG. 4, the BHI may include a Beacon Transmission Interval (BTI), an Association Beamforming Training (A-BFT), and an Announcement Transmission Interval (ATI).

The BTI means a section in which one or more DMG beacon frames can be transmitted. A-BFT refers to a section in which beamforming training is performed by an STA that transmits a DMG beacon frame during a preceding BTI. ATI means a request-response based management access interval between PCP / AP and non-PCP / non-AP STA.

Meanwhile, as shown in FIG. 5, one or more Content Based Access Period (CBAP) and one or more Service Periods (SPs) may be allocated as data transfer intervals (DTIs). Although FIG. 5 shows an example in which two CBAPs and two SPs are allocated, this is merely an example and need not be limited thereto.

Hereinafter, the physical layer configuration in the WLAN system to which the present invention is applied will be described in detail.

In the WLAN system according to an embodiment of the present invention, it is assumed that three different modulation modes may be provided.

Table 1

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

Such modulation modes can be used to meet different requirements (eg, high throughput or stability). Depending on your system, only some of these modes may be supported.

It is assumed that all DMG (Directional Multi-Gigabit) physical layers commonly include fields as shown in FIG. 6. However, there may be a difference in the method of defining individual fields and the modulation / coding method used according to each mode.

As shown in FIG. 6, the preamble of the radio frame may include a Short Training Field (STF) and a Channel Estimation (CE). In addition, the radio frame may include a header and a data field as a payload and optionally a training field for beamforming.

In detail, FIG. 7 illustrates a case in which a single carrier (SC) mode is used. In the SC mode, a header indicates information indicating an initial value of scrambling, a modulation and coding scheme (MCS), information indicating a length of data, and additional information. Information indicating the presence of a physical protocol data unit (PPDU), packet type, training length, aggregation, beam-framing request, last RSSI (Received Signal Strength Indicator), truncation, header check sequence (HCS) Information may be included. In addition, as shown in FIG. 7, the header has 4 bits of reserved bits, which may be used in the following description.

8 illustrates a specific configuration of a header when the OFDM mode is applied. The OFDM header includes information indicating the initial value of scrambling, MCS, information indicating the length of data, information indicating the presence or absence of additional PPDUs, packet type, training length, aggregation, beam beaming request, last RSSI, truncation, Information such as a header check sequence (HCS) may be included. In addition, as shown in FIG. 8, the header has 2 bits of reserved bits, and in the following description, such reserved bits may be utilized as in the case of FIG. 7.

As described above, the IEEE 802.11ay system is considering introducing channel bonding and MIMO technology for the first time in the existing 11ad system. To implement channel bonding and MIMO in 11ay, a new PPDU structure is needed. That is, the existing 11ad PPDU structure has limitations in supporting legacy terminals and implementing channel bonding and MIMO.

To this end, a new field for the 11ay terminal may be defined after the legacy preamble and the legacy header field for supporting the legacy terminal. Here, channel bonding and MIMO may be supported through the newly defined field.

9 illustrates a PPDU structure according to one preferred embodiment of the present invention. In FIG. 9, the horizontal axis may correspond to the time domain and the vertical axis may correspond to the frequency domain.

When two or more channels are bonded, a frequency band (eg, 400 MHz band) of a predetermined size may exist between frequency bands (eg, 1.83 GHz) used in each channel. In the mixed mode, legacy preambles (legacy STFs, legacy: CEs) are transmitted as duplicates through each channel. In an embodiment of the present invention, a new STF and a legacy ST can be simultaneously transmitted through a 400 MHz band between each channel. Gap filling of the CE field may be considered.

In this case, as shown in FIG. 9, the PPDU structure according to the present invention transmits ay STF, ay CE, ay header B, and payload in a broadband manner after legacy preamble, legacy header, and ay header A. Has a form. Therefore, the ay header, ay Payload field, and the like transmitted after the header field may be transmitted through channels used for bonding. Hereinafter, the ay header may be referred to as an enhanced directional multi-gigabit (EDMG) header to distinguish the ay header from the legacy header, and the name may be used interchangeably.

For example, since 11ay has a total of four channels (each 2.16 GHz), the ay header and the ay payload may be transmitted through 2.16 GHz, 4.32 GHz, 6.48 GHz, and 8.64 GHz bandwidth.

Alternatively, the PPDU format when repeatedly transmitting the legacy preamble without performing the gap-filling as described above may also be considered.

In this case, ay STF, ay CE, and ay header B are replaced by a legacy preamble, legacy header, and ay header A without a GF-Filling and thus without the GF-STF and GF-CE fields shown by dotted lines in FIG. 8. It has a form of transmission.

Based on the above, in the present invention, when one or more channels are allocated to the 11ay STA but the primary channel is not included in the one or more channels, the method of operating the 11ay STA and the PCP / AP will be described in detail. do.

As illustrated in FIG. 10, the STA may be allocated an interval of Allocation # 1 to # 3 through a beacon message. The beacon message may be transmitted not only through the primary channel CH1 but also through the secondary channel CH2, but in order to reduce signal overhead, the beacon message may be transmitted through only the primary channel CH1 of the system. Here, Allocation # 1 to # 3 means an allocation interval allocated to each STA, and CBAP or SP may be applied to the allocation interval according to an embodiment. In FIG. 11, Allocation # 1 to # 8 mean an allocation interval allocated to each STA, and each allocation interval may be a CBAP or an SP.

In this case, one or more channels among a plurality of channels provided by the system may be allocated to each STA according to channel bonding capability or channel environment of each STA, and the main channel of the system may not be included in the one or more channels. . In this case, a total of six channels may be applied to the plurality of channels.

However, when one or more channels that do not include the primary channel, such as Allocation # 2 of FIG. 10 and Allocation # 2 to # 4, # 6, # 8 of FIG. 11, are allocated to the STAs, the STAs are the primary channels on the system. Since the CH1 cannot be used, a setting for using a separate channel as a main channel is required during a period in which the one or more channels are allocated. Accordingly, in the PCP / AP according to the present invention, a separate channel that can be used as a primary channel by the STAs to which one or more channels to which one or more channels which do not include CH1, which is the main channel on the system, is allocated, is allocated. Send information specifying the STA to each STA. In this case, a separate channel that can be used as the primary channel during the period in which the one or more channels are allocated may be designated as one channel of the one or more channels.

Accordingly, each STA may use CH1 or a separate channel, which is the primary channel on the system, as the primary channel during one or more channel allocation periods. For example, STAs to which channels are allocated, such as Allocation # 2 of FIG. 10 and Allocation # 2 to # 4, # 6, and # 8 of FIG. 11, may use preambles of a PPDU frame through a newly designated primary channel instead of CH1 during an allocation period. preamble) can be decoded. Alternatively, when the allocation intervals are CBAPs, the STA may perform a backoff operation through a newly designated primary channel instead of CH1 during the allocation interval.

In addition, as shown in Allocation # 6 of FIG. 11, an STA to which a plurality of channels not including a main channel (for example, CH1) of a system is allocated may be assigned to a main channel of the system (eg, to a channel). For example, the plurality of channels may be combined based on a newly designated primary channel other than CH1) to transmit data to another STA.

Hereinafter, a signaling configuration for operating the PCP / AP and the STA as described above and a detailed operation method based on the same will be described in detail.

실시예Example 1. 새로운 1. New EDMGEDMG 동작 요소 (operation element) 를 추가 Add operation element

In an example according to the present invention, the main channel information by adding an EDMG operation element, which is a new element in a management frame (such as a beacon frame or association frame), and transmitting and receiving the management frame between the PCP / AP and the STA, Secondary channel offset information may be transmitted and received.

For example, when one or more channels that do not include the primary channel supported by the system are allocated to a specific STA, the PCP / AP transmits a management frame including an EDMG operation element to the specific STA to make a channel available as the primary channel. You can provide information that you specify.

The EDMG operation element may have a structure similar to the high throughput (HT) operation element of an 11an or 11ac system. The EDMG operation element is a field indicating primary channel information. It may include an EDMG operation information field including channel offset information.

Option 1) Signaling through a new field

The PCP / AP alternates one channel of the plurality of channels to all STAs in the BSS during the beacon period in which signaling results are maintained through a new field, the alternative primary channel field. primary channel).

Table 2 and Table 3 show an example of signaling in which the total number of channels supported by the system is set to four, but the total number of channels may be extended to six or the like. Accordingly, the number of bits of the bit information designating the alternative primary channel can be increased according to the total number of channels.

TABLE 2

Bit n	Bit n + 1	Description
0	0	Alternative primary channel = original primary channel
0	One	Alternative primary channel = (the number of original primary channel +1) mod 4
One	One	Alternative primary channel = (the number of original primary channel +2) mod 4
One	0	Alternative primary channel = (the number of original primary channel +3) mod 4

TABLE 3

Bit n	Bit n + 1	Description
0	0	Channel 1 is alternative primary channel
0	One	Channel 2 is alternative primary channel
One	One	Channel 3 is alternative primary channel
One	0	Channel 4 is alternative primary channel

Option 2) define selection rules for alternative primary channels in advance

Unlike option 1, an alternative primary channel can be set during a period in which one or more channels are assigned by defining an alternative primary channel selection rule as follows, without adding a new field to the existing system. In this case, the following example will be described as an example in which the total number of channels supported by the system is set to four, but the total number of channels may be set to six or more according to an embodiment, and the selection rule may also be changed accordingly. Can be.

If

channels

1 and 2 are the primary channel, then the alternative primary channel is channel 3

If

channels

3 and 4 are the primary channels, then the alternative primary channel is channel 2

Alternative primary channel = (The number of primary channel +2) mod 4

Such flexible channel assignment and alternative primary channel signaling may be on an EDMG operating element basis within a beacon frame or notification frame body.

실시예Example 2. 기존 2. Existing 11ad11ad 시스템에 따른 According to the system DMGDMG 동작 요소를 수정 Modify behavior elements

In another example according to the present invention, the PCP / AP uses the existing DMG operation element included in the management frame (such as a beacon frame or a relationship frame) of the 11ad system to perform a multi-channel operation of the STA. channel operation). As shown in FIG. 12, the DMG operation information field includes a reserved bit of 13 bits in length, wherein one or more channels allocated to the STA through the reserved bits and the one or more channels are allocated. The allocation interval, main channel information, etc. during the allocation interval may be signaled.

In this case, it is determined whether an interval in which one or more channels are allocated to each STA is 'SP allocation out of primary channel' or 'CBAP allocation out of primary channel' through an allocation type field in the extended schedule element. Can be directed. In this way, it is possible to distinguish whether a channel access method is performed through one or more channels that do not include a predetermined primary channel in the system in the DTI period.

In this case, a method similar to the method of Embodiment 1 may be applied as a specific signaling method.

실시예Example 3. 확장 스케줄 요소(Extended Schedule element)에서 대안적인 주 채널을 지정 3. Specify an alternative primary channel in the Extended Schedule element

FIG. 13 is a diagram illustrating an extended schedule element included in a beacon frame body or a notification frame body of the 11ad system. As illustrated in FIG. 13, the PCP / AP allocates the CBAP and the SP interval, which are channel access methods in the DTI interval, to the DMG STAs through an allocation field of the extended schedule element. The allocation field includes an allocation control subfield, and the allocation control subfield includes a 4-bit reserved subfield.

In an example applicable to the present invention, two bits of reserved bits included in the extended schedule element may be used to indicate an alternative primary channel as follows.

Table 4

Bit 12	Bit 13	Description
0	0	Alternative primary channel = original primary channel
0	One	Alternative primary channel = (the number of original primary channel +1) mod 4
One	One	Alternative primary channel = (the number of original primary channel +2) mod 4
One	0	Alternative primary channel = (the number of original primary channel +3) mod 4

Table 5

Bit 12	Bit 13	Description
0	0	Channel 1 is alternative primary channel
0	One	Channel 2 is alternative primary channel
One	One	Channel 3 is alternative primary channel
One	0	Channel 4 is alternative primary channel

In this way, flexible channel allocation can be performed in units of allocation fields, and alternative primary channels can be set differently for each allocation field.

In a further embodiment, bandwidth allocated to each STA may be indicated as follows using 2 bit information of the reserved subfield of the extended schedule element.

Table 6

Bit 14	Bit 15	Description
0	0	Bandwidth is 2.16 GHz
0	One	Bandwidth is 4.32 GHz
One	One	Bandwidth is 6.48 GHz
One	0	Bandwidth is 8.64 GHz

In this case, it is assumed that the bandwidth of one channel is 2.16 GHz. In addition, in order to indicate bandwidth information, channels allocated to each STA may be preset or selected.

In a further embodiment applicable to Embodiments 1 to 3, the PCP / AP or non-PCP / AP STA may be channel bonded via an EDMG Capabilities element included in a management frame (beacon frame, relationship frame, etc.) body. Can provide information about capabilities. More specifically, by having a supported channel width set field in which the EDMG capability element is supported, the PCP / AP or non-PCP / AP STA may provide information about its channel bonding capability.

In addition, the PCP / AP or non-PCP / AP STA may add a new field in the EDMG capability element to provide information about the capability regarding MIMO and OFDMA.

In addition, the PCP / AP or non-PCP / AP STA adds an available multichannel access field to the EDMG Capabilities element included in the body of the management frame (beacon frame, relationship frame, etc.) It may be provided whether there is an ability to support access to channels other than the primary channel (or operating channel) in the interval.

Through the various methods as described above, even if one or more channels that do not include a preconfigured primary channel are allocated in the system, the STA may separately set a primary channel (eg, an alternative primary channel) during the period in which the one or more channels are allocated. It can be operated based on.

In this case, when the interval in which the one or more channels are allocated is over, the STA may operate based on a preconfigured main channel in a system that is not a separate main channel (eg, an alternative main channel). To this end, the STA may operate based on a main channel preset in the system after the end of the allocation period by using a duration related field in the extended schedule element. For example, a duration related field in the extended schedule element may include an allocation start field, an allocation block duration field, a number of blocks field, and an allocation block period. May contain fields.

Alternatively, when receiving a beacon frame instructing the system to use a preconfigured primary channel as a primary channel after data transmission to another STA during the allocation interval, the STA may determine that a channel designated as an alternative primary channel during the allocation interval is received. In addition, the preset main channel may be used as the main channel in the system.

Alternatively, if data transmission to another STA is completed during the allocation interval, the STA may immediately use the preconfigured primary channel in the system even if the allocation interval is not terminated.

Hereinafter, an operation when a STA according to the present invention and a STA supported by the conventional 11ad system coexist in one BSS will be described. Hereinafter, in FIGS. 14 to 16, the STA supported by the 11ad system is represented by legacy, and the STA according to the present invention is represented by 11ay. Accordingly, STA A and STA B are represented as legacy STAs, and STA C and STA D are represented as 11ay STAs.

As illustrated in FIG. 14, in a BSS forming or association process, legacy STAs and 11ay STAs use a primary channel supported by the system as an operation channel to form a BSS.

The legacy STA forms a link with the PCP / AP through the DMG operation element and the DMG capabilities element. On the other hand, as described above, the 11ay STA may form a link with the PCP / AP by modifying the reserved bits included in the DMG operation element and the DMG capability element defined in the existing system or newly defining the EDMG operation element and the EDMG capability element. .

Through this negotiation process, the PCP / AP may check whether the 11ay STA can support multi-channel operation.

In addition, the 11ay STA may receive information on primary channels and secondary channels through a DMG operation element or an EDMG operation element in the process of forming a link with the PCP / AP.

As shown in FIG. 15, the PCP / AP may allocate one or more channels to each STA through an extended schedule element after link formation with each STA. For example, CH1, which is a main channel preset in the system, may be allocated to the legacy STA, and CH2 and CH3 except for CH1 may be allocated to the 11ay STA in order to prevent collision with the legacy STA.

In this case, since the channels allocated to the 11ay STA do not include CH1, which is a preset main channel in the system, the PCP / AP uses a channel to be used as the main channel during the period in which CH2 and CH3 are allocated to the 11ay STA through an extended schedule element. Provides information specifying. As a method for this, the reserved bit information in the allocation control subfield in each allocation field in the extended schedule element may be used as described above.

As shown in FIG. 16, during the DTI, the 11ay STA and the legacy STAs transmit and receive data or frames through allocated channels, respectively. For example, STA A, a legacy STA, may transmit data to STA B through CH1, and STA C, which is an 11ay STA, may transmit data to STA D through CH2 and CH3. In this case, when either one of the CH2 and CH3 is busy, the STA C may transmit data using only one channel.

Here, STA C, which is an 11ay STA, uses CH2 or CH3 as the primary channel during the allocation period shown in FIG. 16. For example, if the PCP / AP transmits information indicating CH2 as the primary channel to the STA C during the allocation period, the STA C may transmit data to STA D by combining CH2 and CH3 based on the CH2. . In addition, when the interval allocated to STA C is a CBAP, the STA C may perform backoff using CH2 and decode a preamble of the PPDU frame.

In addition, when STA C transmits data to STA D, in a specific allocation field of the extended schedule element that PCP / AP transmits to STA C and STA D, the Source AID subfield includes the AID of STA C. The destination AID subfield may include the AID of the STA D. In this case, a broadcast AID may be applied to each AID subfield, and a group ID of each STA may be applied.

In addition, an allocation type in an allocation control field in the specific allocation field may indicate whether a section allocated to the STA C and the STA D is a CBAP or an SP.

The wireless device 800 of FIG. 17 may correspond to a specific STA of the above description, and the wireless device 850 may correspond to the PCP / AP of the above description.

The STA 800 may include a processor 810, a memory 820, and a transceiver 830, and the PCP / AP 850 may include a processor 860, a memory 870, and a transceiver 880. can do. The transceiver 830 and 880 may transmit / receive a radio signal and may be executed in a physical layer such as IEEE 802.11 / 3GPP. The processors 810 and 860 are executed at the physical layer and / or MAC layer, and are connected to the transceivers 830 and 880. Processors 810 and 860 may perform the aforementioned UL MU scheduling procedure.

Processors 810 and 860 and / or transceivers 830 and 880 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits and / or data processors. The memories 820 and 870 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage units. When an embodiment is executed by software, the method described above can be executed as a module (eg, process, function) that performs the functions described above. The module may be stored in the memory 820, 870 and executed by the processors 810, 860. The memories 820 and 870 may be disposed inside or outside the processes 810 and 860 and may be connected to the processes 810 and 860 by well-known means.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable any person skilled in the art to make and practice the invention. Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will understand that the present invention can be variously modified and changed from the above description. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

As described above, the present invention has been described assuming that it is applied to an IEEE 802.11-based WLAN system, but the present invention is not limited thereto. The present invention can be applied in the same manner to various wireless systems capable of data transmission based on channel bonding.

Claims

In the method of operating a first station (STA) in a WLAN system,

Receive allocation information for one or more channels from an access point (AP) via a primary channel,

If the first primary channel is not included in the one or more channels, receiving information designating one of the one or more channels as a second primary channel from the AP,

The first STA uses the second primary channel as the primary channel during the period in which the one or more channels are allocated.
The method of claim 1,

When the one or more channels are a plurality of channels, the first STA combines the plurality of channels based on the second primary channel and transmits data to a second STA.
The method of claim 1,

The allocation information on the one or more channels and the information on the second primary channel are received through an Enhanced Directional Multi-Gigabit (EDMG) beacon or an announcement frame.
The method of claim 1,

The section in which the one or more channels are allocated includes a contention based access period (CBAP) or a service period (SP),

If the one or more channels are allocated to the CBAP, the first STA performs a backoff or frame decoding on the second primary channel, the operation method in a WLAN system.
The method of claim 1,

The allocation information for the one or more channels and the information about the second primary channel are transmitted through an extended schedule element in an enhanced directional multi-gigabit (EDMG) beacon or an announcement frame. How it works on your system.
The method of claim 5,

The extended schedule element includes an allocation control field.

The allocation control field includes information on the second primary channel and bandwidth information allocated to the first STA.
The method of claim 1,

And transmitting information on whether the first STA is able to access a channel other than the first primary channel during the data transfer interval (DTI) to the AP.
The method of claim 1,

When the one or more channels have been allocated, the first STA uses the first primary channel as the primary channel instead of the second primary channel.
The method of claim 1,

When receiving a beacon frame instructing to use the first primary channel as the primary channel from the AP after data transmission to the second STA, the first STA is the primary channel rather than the second primary channel Method used in a wireless LAN system.
The method of claim 1,

When the data transmission to the second STA is completed, the first STA immediately uses the first primary channel as the primary channel instead of the second primary channel.
A method of operating an access point (AP) in a WLAN system,

Transmit allocation information for one or more channels to a station (STA) through a first primary channel,

If the first primary channel is not included in the one or more channels, information indicating one channel of the one or more channels as a second primary channel is transmitted to the STA,

The AP controls the STA to use the second primary channel as a primary channel during a period in which the one or more channels are allocated.
A station apparatus operating in a WLAN system,

A transceiver having one or more RF chains and configured to receive scheduling information from an access point (AP); And

A processor coupled to the transceiver, the processor processing the scheduling information received by the transceiver;

The processor controls to receive allocation information for one or more channels from an access point (AP) via a first primary channel,

If the first primary channel is not included in the one or more channels, the processor controls to receive information designating one of the one or more channels as a second primary channel from the AP,

The processor uses the second primary channel as a primary channel during the interval in which the one or more channels are allocated.
An access point device operating in a WLAN system,

A transceiver having one or more RF chains and configured to receive scheduling information from an access point (AP); And

A processor coupled to the transceiver, the processor processing the scheduling information received by the transceiver;

The processor controls to transmit the allocation information for one or more channels to the station (STA) through a first primary channel,

If the first primary channel is not included in the one or more channels, the processor controls to transmit information indicating one of the one or more channels as a second primary channel to the STA,

The processor controls the STA to use the second primary channel as a primary channel during a period in which the one or more channels are allocated.