The following description relates to a method for transmitting and receiving a signal in a wireless LAN (WLAN) system, and, more particularly, in a case where a station transmits and receives a signal through one or two bonded channels, the following description relates to a method for transmitting and receiving a signal, which configures an EDMG (Enhanced Directional Multi Gigabit (EDMG) Short Training Field (STF) field for an Orthogonal Frequency Division Multiplexing (OFDM) packet, and which transmits and receives a signal including the configured EDMG STF field, and a device for the same.
A standard for the wireless LAN technology is being developed as an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. IEEE 802.11a and b use an unlicensed band in 2.4. GHz or 5 GHz. And, IEEE 802.11b provides a transmission rate of 11 Mbps, and IEEE 802.11a provides a transmission rate of 54 Mbps. And, IEEE 802.11g provides a transmission rate of 54 Mbps by applying orthogonal frequency-division multiplexing (OFDM). IEEE 802.11n provides a transmission rate of 300 Mbps on 4 spatial streams by applying multiple input multiple output-OFDM (MIMO-OFDM). The IEEE 802.11n supports a channel bandwidth of up to 40 MHz, and, in this case, the IEEE 802.11n provides a transmission rate of 600 Mbps.
The above-described wireless LAN (WLAN) standard was previously defined as the IEEE 802.11ac standard, which uses a maximum bandwidth of 160 MHz, supports 8 spatial streams, and supports a maximum rate of 1 Gbit/s. And, discussions are now being made on the IEEE 802.11ax standardization.
Meanwhile, the IEEE 802.11ad system regulates a capability enhancement for an ultra-high speed throughput in a 60 GHz band, and, for the first time, in the above-described IEEE 802.11ad system, discussions are being made on an IEEE 802.11ay for adopting channel bonding and MIMO techniques.
Technical Objects
In an 11ay system that can apply the present invention, a station may transmit and receive a signal through one or two bonded channels (i.e., a 2-channel bonded channel).
At this point, in case the station transmits and receives a signal through the bonded channels, the present invention proposes a method for configuring an EDMG STF field for an OFDM packet and for transmitting and receiving a signal including the configured EDMG STF field, and a device for the same.
Technical Solutions
In order to achieve the above-described object, according to an aspect of the present invention, proposed herein is a method for transmitting, by a first station (STA), a signal through one or two bonded channels to a second station (STA) in a wireless LAN (WLAN) system including the steps of generating an Enhanced Directional Multi Gigabit (EDMG) Short Training Field (STF) field being transmitted in an Orthogonal Frequency Division Multiplexing (OFDM) mode based on a number of channels and a space-time stream index being included in a bonded channel through which an EDMG Physical Protocol Data Unit (PPDU) is transmitted, and transmitting the EDMG PPDU including the EDMG STF field being transmitted in the OFDM mode through a space-time stream within the one or two bonded channels to the second STA. Herein, an EDMG STF sequence for each space-time stream being included in the EDMG STF field may be configured to have a format of A, 0, 0, 0, B, and A and B may respectively indicate sequences each having a different length according to the number of channels being included in the bonded channels, A and B of each space-time stream may be respectively orthogonal to A and B of another space-time stream, and values other than 0 being included in A and B have a configuration, in which values of a first sequence and a second sequence, each having a different length according to the number of channels being included in the bonded channels, may be repeatedly positioned after being added with a weight according to a predetermined rule.
According to another aspect of the present invention, proposed herein is a method for receiving, by a first station (STA), a signal through one or two bonded channels from a second station (STA) in a wireless LAN (WLAN) system including the steps of receiving an Enhanced Directional Multi Gigabit (EDMG) PPDU including an EDMG Short Training Field (STF) field being generated based on a number of channels and a space-time stream index being included in a bonded channel through which an EDMG Physical Protocol Data Unit (PPDU) is transmitted, and being transmitted in the OFDM mode through a space-time stream within the one or two bonded channels from the second STA. Herein, an EDMG STF sequence for each space-time stream being included in the EDMG STF field may be configured to have a format of A, 0, 0, 0, B, and A and B may respectively indicate sequences each having a different length according to the number of channels being included in the bonded channels, A and B of each space-time stream may be respectively orthogonal to A and B of another space-time stream, and values other than 0 being included in A and B have a configuration, in which values of a first sequence and a second sequence, each having a different length according to the number of channels being included in the bonded channels, may be repeatedly positioned after being added with a weight according to a predetermined rule.
According to yet another aspect of the present invention, proposed herein is a station device for transmitting a signal through one or two bonded channels in a wireless LAN (WLAN) system including a transmitting/receiving unit having one or more radio frequency (RF) chains and being configured to transmit/receive a signal to/from another station device, and a processor being operatively connected to the transmitting/receiving unit and performing signal processing of a signal transmitted/received to/from the other station device, wherein the processor may be configured to generate an Enhanced Directional Multi Gigabit (EDMG) Short Training Field (STF) field being transmitted in an Orthogonal Frequency Division Multiplexing (OFDM) mode based on a number of channels and a space-time stream index being included in a bonded channel through which an EDMG Physical Protocol Data Unit (PPDU) is transmitted, and to transmit the EDMG PPDU including the EDMG STF field being transmitted in the OFDM mode through a space-time stream within the one or two bonded channels to a second station (STA). Herein, an EDMG STF sequence for each space-time stream being included in the EDMG STF field may be configured to have a format of A, 0, 0, 0, B, and A and B may respectively indicate sequences each having a different length according to the number of channels being included in the bonded channels, A and B of each space-time stream may be respectively orthogonal to A and B of another space-time stream, and values other than 0 being included in A and B have a configuration, in which values of a first sequence and a second sequence, each having a different length according to the number of channels being included in the bonded channels, may be repeatedly positioned after being added with a weight according to a predetermined rule.
According to a further aspect of the present invention, proposed herein is a station device for receiving a signal through one or two bonded channels in a wireless LAN (WLAN) system including a transmitting/receiving unit having one or more radio frequency (RF) chains and being configured to transmit/receive a signal to/from another station device, and a processor being operatively connected to the transmitting/receiving unit and performing signal processing of a signal transmitted/received to/from the other station device, wherein the processor may be configured to receive an Enhanced Directional Multi Gigabit (EDMG) PPDU including an EDMG Short Training Field (STF) field being generated based on a number of channels and a space-time stream index being included in a bonded channel through which an EDMG Physical Protocol Data Unit (PPDU) is transmitted, and being transmitted in the OFDM mode through a space-time stream within the one or two bonded channels from a second station (STA). Herein, an EDMG STF sequence for each space-time stream being included in the EDMG STF field may be configured to have a format of A, 0, 0, 0, B, and A and B may respectively indicate sequences each having a different length according to the number of channels being included in the bonded channels, A and B of each space-time stream may be respectively orthogonal to A and B of another space-time stream, and values other than 0 being included in A and B have a configuration, in which values of a first sequence and a second sequence, each having a different length according to the number of channels being included in the bonded channels, may be repeatedly positioned after being added with a weight according to a predetermined rule.
In the above-described configurations, the EDMG STF field may be configured of 6 OFDM symbol lengths.
For example, a number of channels being included in the bonded channels through which the EDMG PPDU is transmitted may be equal to 1. In this case, detailed technical characteristics will be described below.
Firstly, A and B may be configured as 176-length sequences.
Values other than 0 being included in such A and B may have a configuration, in which values of the first sequence and the second sequence, each having a length of 11, are repeatedly positioned after being added with a weight according to a predetermined rule.
Additionally, a maximum of 8 space-time streams may be used, and the first sequence (A0i
A0i
B0i
Values other than 0 being included in A and B may be configured of sequences of A2i
Aki
Bki
The Wki
Additionally, A and B of each space-time stream may respectively include a 0, 0, 0 sequence between the values other than 0.
Most particularly, A of each space-time stream may include a 0 sequence being positioned in a foremost position and a 0, 0 sequence being positioned in a rearmost position, and B of each space-time stream may include a 0, 0 sequence being positioned in a foremost position and a 0 sequence being positioned in a rearmost position.
A for each space-time stream (ISTS), which is configured as described above, may be indicated as shown below in Table 22 and Table 23.
B for each space-time stream (ISTS) may be configured to be indicated as shown below in Table 24 and Table 25.
As another example, a number of channels being included in the bonded channels through which the EDMG PPDU is transmitted may be equal to 2. In this case, detailed technical characteristics will be described below.
Firstly, A and B may be configured as 385-length sequences.
Values other than 0 being included in such A and B may have a configuration, in which values of the first sequence and the second sequence, each having a length of 3, are repeatedly positioned after being added with a weight according to a predetermined rule.
Additionally, a maximum of 8 space-time streams may be used, and the first sequence (A0i
A0i
B0i
Values other than 0 being included in A and B may be configured of sequences of A5i
Aki
Bki
The Wki
Additionally, A and B of each space-time stream may respectively include a 0, 0, 0 sequence between the values other than 0.
Most particularly, A and B of each space-time stream may respectively include a 0, 0 sequence being positioned in a foremost position, and a 0, 0 sequence being positioned in a rearmost position.
A for each space-time stream (ISTS), which is configured as described above, may be indicated as shown below in Table 27 to Table 30.
B for each space-time stream (ISTS) may be configured to be indicated as shown below in Table 31 to Table 34.
The effects of the present invention will not be limited only to the effects described above. Accordingly, effects that have not been mentioned above or additional effects of the present application may become apparent to those having ordinary skill in the art from the description presented below.
Effects of the Invention
By applying the above-described configuration, in case a station according to the present invention transmits an OFDM packet through one or two bonded channels, by configuring an EDMG STF field using the method proposed in the present invention, a low Peak to Average Power Ratio (PAPR) may be achieved.
The effects of the present invention will not be limited only to the effects described above. Accordingly, effects that have not been mentioned above or additional effects of the present application may become apparent to those having ordinary skill in the art from the description presented below.
The appended drawings of this specification are presented to provide a further understanding of the present invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and serve to explain the principle of the invention along with the description of the present invention.
Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the appended drawings. The detailed description that will hereinafter be disclosed along with the appended drawings will only be provided to describe an exemplary embodiment of the present invention. And, therefore, it should be understood that the exemplary embodiment presented herein will not represent the only embodiment for carrying out the present invention.
The following detailed description includes specific details for providing a full understanding of the present invention. However, it will be apparent to anyone skilled in the art that the present invention can be carried out without referring to the above-mentioned specific details. In some cases, in order to avoid any ambiguity in the concept of the present invention, the disclosed structure and device may be omitted, or the disclosed structure and device may be illustrated as a block diagram based on their core functions.
Although diverse mobile communication systems applying the present invention may exist, a wireless LAN (WLAN) system will hereinafter be described in detail as an example of such mobile communication system.
1. Wireless LAN (WLAN) System
1-1. General Wireless LAN (WLAN) System
As shown in
As a logical entity including a Medium Access Control (MAC) and a Physical Layer interface for a wireless medium, an STA includes an access point (AP) and a non-AP Station. Among the STAs, a portable device (or terminal) that is operated by a user corresponds to a non-AP Station. And, therefore, when an entity is simply mentioned to as an STA, the STA may also refer to a non-AP Station. Herein, the non-AP Station may also be referred to as other terms, such as a terminal, a wireless transmit/receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile terminal, a mobile subscriber unit, and so on.
Additionally, the AP is an entity providing its associated station (STA) with an access to a distribution system (DS) through a wireless medium. Herein, the AP may also be referred to as a centralized controller, a base station (B), a Node-B, a base transceiver system (BTS), a personal basic service set central point/access point (PCP/AP), a site controller, and so on.
A BSS may be categorized as an infrastructure BSS and an independent BSS (IBSS).
The BSS shown in
The BSS shown in
As shown in
As a mechanism that connects the plurality of APs, the DS is not necessarily required to correspond to a network. As long as the DS is capable of providing a predetermined distribution service, there is no limitation in the structure or configuration of the DS. For example, the DS may correspond to a wireless network, such as a mesh network, or the DS may correspond to a physical structure (or entity) that connects the APs to one another.
Hereinafter, a channel bonding method that is performed in a wireless LAN system will hereinafter be described in detail based on the description presented above.
1-2. Channel Bonding in a Wireless LAN (WLAN) System
As shown in
The example shown in
The two exemplary channels of
However, in case of performing contention-based channel bonding, as shown in
Accordingly, in an aspect of the present invention, a solution (or method) for performing scheduling-based access by having the AP transmit scheduling information to the STAs is proposed. Meanwhile, in another aspect of the present invention, a solution (or method) for performing contention-based channel access based on the above-described scheduling or independently from the above-described scheduling is proposed. Furthermore, in yet another aspect of the present invention, a method for performing communication through a spatial sharing technique based on beamforming is proposed.
1-3. Beacon Interval Configuration
In an 11ad-based DMG BSS system, the time of medium may be divided into beacon intervals. A lower level period within the beacon interval may be referred to as an access period. Each of the different access periods within one beacon interval may have a different access rule. Such information on the access period may be transmitted by an AP or personal basic service set control point (PCP) to a non-AP STA or non-PCP.
As shown in the example of
The BTI refers to a period (or section or duration) during which one more DMG beacon frames may be transmitted. The A-BFT refers to a period during which beamforming training is performed by an STA, which has transmitted a DMG beacon frame during a preceding BTI. The ATI refers to a request-response based management access period between PCP/AP and non-PCP/non-AP STA.
Meanwhile, the Data Transfer Interval (DTI) refers to a period during which a frame exchange is performed between the STAs. And, as shown
Hereinafter, a physical layer configuration in a wireless LAN (WLAN) system, in which the present invention is to be applied, will be described in detail.
1-4. Physical Layer Configuration
It will be assumed that the wireless LAN (WLAN) system according to an exemplary embodiment of the present invention may provide 3 different modulations mode as shown below.
Such modulation modes may be used for satisfying different requirements (e.g., high throughput or stability). Depending upon the system, among the modulation modes presented above, only some of the modulation modes may be supported.
It will be assumed that all Directional Multi-Gigabit (DMG) physical layers commonly include the fields that are shown below in
As shown in
More specifically,
Additionally,
As described above, the IEEE 802.11ay system considers for the first time the adoption of channel bonding the MIMO technique to the legacy 11ad system. In order to implement channel boning and MIMO, the 11ay system requires a new PPDU structure. In other words, when using the legacy 11ad PPDU structure, there are limitations in supporting the legacy user equipment (UE) and implementing channel bonding and MIMO at the same time.
For this, a new field for the 11ay UE may be defined after the legacy preamble and legacy header field for supporting the legacy UE. And, herein, channel bonding and MIMO may be supported by using the newly defined field.
When two or more channels are bonded, a frequency band having a predetermined size (e.g., a 400 MHz band) may exist between a frequency band (e.g., 1.83 GHz) that is used between each channel. In case of a Mixed mode, a legacy preamble (legacy STF, legacy CE) is duplicated through each channel. And, according to the exemplary embodiment of the present invention, it may be considered to perform the transmission (gap filling) of a new STF and CE field along with the legacy preamble at the same time through the 400 MHz band between each channel.
In this case, as shown in
For example, a total of 6 channels or 8 channels (each corresponding to 2.16 GHz) may exist in the 11ay system, and a maximum of 4 channels may be bonded and transmitted to a single STA. Accordingly, the ay header and the ay Payload may be transmitted through bandwidths of 2.16 GHz, 4.32 GHz, 6.48 GHz, and 8.64 GHz.
Alternatively, a PPDU format of a case where the legacy preamble is repeatedly transmitted without performing the above-described gap-filling may also be considered.
In this case, since the Gap-Filling is not performed, the PPDU has a format of transmitting the ay STF, ay CE, and ay Header B after the legacy preamble, legacy header, and ay Header A without the GF-STF and GF-CE fields, which are illustrated in dotted lines in
As shown in
Herein, the part (or portion) including the L-STF, L-CEF, and L-header fields may be referred to as a Non-EDMG portion, and the remaining part (or portion) may be referred to as an EDMG portion (or region). Additionally, the L-STF, L-CEF, L-Header, and EDMG-Header-A fields may be referred to as pre-EDMG modulated fields, and the remaining fields may be referred to as EDMG modulated fields.
The (legacy) preamble part of the above-described PPDU may be used for packet detection, Automatic Gain Control (AGC), frequency offset estimation, synchronization, indication of modulation (SC or OFDM), and channel estimation. A format of the preamble may be common to both OFDM packets and SC packets. Herein, the preamble may be configured of a Short Training Field (STF) and a Channel Estimation (CE) field that is positioned after the STF field.
The STF is configured of 16 repetitions of Ga128(n) sequences having the length of 128 followed by a single −Ga128(n) sequence. Herein, the waveform for the STF may be expressed as shown in the following equation.
The Golay sequences (e.g., Ga128(n), Gb128(n), Ga64(n), Gb64(n), Ga32(n), Gb32(b)) are used in the preamble, a single carrier guard interval, and beam refinement TRN-R/T and AGC fields. The Golay sequences may be referred to as complementary sequences. The subscript indicates the length of the sequences. The sequences are generated by using the following recursive procedure.
A0(n)=δ(n) [Equation 2]
B0(n)=δ(n)
Ak(n)=WkAk−1(n)+Bk−1(n−Dk)
Bk(n)=WkAk−1(n)−Bk−1(n−Dk)
Herein, in case n<0 or n≥2k, Ak(n) and Bk(n) may each be given the value of 0.
In the above-described procedure, in case Dk=[1 8 2 4 16 32 64] (k=1, 2, . . . , 7) and Wk=[−1 −1 −1 −1 +1 −1 −1] are used, values may be given as Ga128(n)=A7(128-n) and Ga128(n)=B7(128-n).
Alternatively, in the above-described procedure, in case Dk=[2 1 4 8 16 32] and Wk=[1 1 −1 −1 1 −1] are used, values may be given as Ga64(n)=A6(64-n) and Ga64(n)=B6(64-n).
Alternatively, in the above-described procedure, in case Dk=[1 4 8 2 16] and Wk=[−1 1 −1 1 −1] are used, values may be given as Ga32(n)=A5(32-n) and Ga32(n)=B5(32-n).
Each of the above-described sequences may be indicated as shown in
Hereinafter,
3. Exemplary Embodiment that is Applicable to the Present Invention
The PPDU format shown in
At this point, each field may be defined as shown below.
In case the STA according to the present invention is operated in accordance with a Single Input Single Output (SISO) scheme that uses a single channel, the EDMG-STF and EDMG-CEF of Table 2 may not be transmitted.
Hereinafter, a method of designing an EDMG-STF for an OFDM packet (or for an OFDM transmission mode) is proposed based on the above-described technical configurations. More specifically, the present invention proposes a method of designing an EDMG-STF for an OFDM packet while considering the following reference details. Hereinafter, the reference details that are being considered in the present invention will be described in detail.
(1) Frequency/Time Domain Sequence
The EDMG-STF for an OFDM packet may be transmitted by being configured of a sequence that is generated in the time domain. For example, the EDMG-STF for an OFDM packet may be defined as a DMG-STF that is defined in the 11ad system, or as a new Golay sequence, or as an EDMG-STF for a single carrier (SC) that is defined in the 11ay system.
As a method for matching the sequence defined in the above-described methods with a bandwidth that is occupied by the OFDM packet, a resampling method that is used in the 11ad system may be amended and used, or a new sampling rate may be defined and used. However, the implementation of such configuration may cause a considerable burden.
Accordingly, the present invention proposes a method that allows the EDMG-STF to be compatible with an EDMG-CEF by generating a sequence that corresponds to the EDMG-STF in the frequency domain. Thus, by also allowing the bandwidths for the payloads to match one another, a more accurate AGC may be performed as compared to the STA.
As shown in
(2) Processing Time for L-Header Decoding
The EDMG-STF for the SC packet is designed to have 18 Ga128*NCB sequences and 1 −Ga128*NCB sequence considering the processing time of the DMG header. At this point, the time occupied by the total of 18+1 sequences is equal to approximately 1.3818 us. Herein, NCB indicates a number of channels being used for channel bonding by using a channel bonding factor.
As described above, the EDMG-STF for the OFDM packet that is proposed in the present invention may also be designed while considering the processing time of the DMG header. At this point, when it is assumed that the length (TDFT+TGI) of one OFDM symbol is equal to 0.2424 us, 6 or more OFDM symbols may be needed for the decoding of the legacy header. This is because 1.3818 us/0.2424 us=5.7. Thus, the configuration of an EDMG-STF by using 6 OFDM symbols is proposed in the present invention.
(3) Compatible Structure to EDMG-STF for SC
As described above, the EDMG-STF for the SC may have a structure of being repeated 4 times within a single carrier block by using Ga128 (in case NCB=1). Herein, the structure that is repeated as described above and the number of such structure may influence the AGC and the synchronization performance. Accordingly, the OFDM-specific EDMG-STF may also have a structure of being repeated 4 times during one DFT/IDFT period so as to have similar performance requirement values as the SC.
Herein, the structure of having a specific sequence being repeated 4 times during one DFT/IDFT period is advantageous in that, when considering that a Cyclic Prefix (CP) length of the 11ad system is configured of TDFT/4, the corresponding structure has a uniform structure wherein a specific sequence is repeated 5 times during one OFDM symbol period.
As described above, in order to allow a specific sequence to be repeated 4 times within the time domain during the DFT/IDFT period, the EDMG-STF for the OFDM according to the present invention may have a structure of having 3 zeros (0s) being repeatedly inserted within the frequency domain.
(4) Hardware (HW) Complexity
As a solution for reducing hardware (HW) complexity, a value other than 0 being included in the EDMG-STF sequence, which is proposed in the present invention, may be given a value corresponding to any one of +1, −1, +j, and −j.
(5) Orthogonality for MIMO Support
In order to support MIMO transmission, the sequences for each of the spatial streams according to the present invention may be designed to be mutually orthogonal (or orthogonal to one another).
(6) Peak to Average Power Ratio (PAPR) Performance
In order to achieve highly reliable signal transmission and reception, the sequences according to the present invention may be designed to minimize PAPR. Most particularly, the EDMG-STF according to the present invention may be designed to have a similar PAPR as the PAPR (e.g., 3.12 dB) of the DMG-CEF of the 11ad system.
Hereinafter, a sequence that is applicable to a case where one or two channels are bonded based upon the above-described reference details and a method for generating the corresponding sequence will be described in detail.
Herein, the EDMG-STF according to the present invention has a fixed time size (or length) (e.g., 6 OFDM symbol periods). At this point, the fixed time size may be configured independently from the number of space-time sequences.
The structure of the EDMG-STF field according to the present invention may be determined based on a number of consecutive channels (e.g., 2.16 GHz channel) being transmitted and an index of a space-time stream.
3.1. In Case of a Single Channel, Sequence of an EDMG-STF for OFDM
In order to perform an EDMG OFDM transmission through a single channel (e.g., 2.16 GHz), a frequency sequence (or frequency domain signal), which is used for configuring the EDMG STF field for the iSTSth space-time stream, may be expressed as shown below in the following equation.
EDMG-STF−177,177i
where “iSTS” is the space-time stream number and 1≤iSTS≤4
EDMG-STF−177,177i
where “iSTS” is the space-time stream number and 5≤iSTS≤8
At this point, EDMGSleft,176i
A more generalized version of Equation 3 and each sequence shown in
EDMG-STF−177,177i
where:
iSTS is the space-time stream number and 1≤iSTS≤8
At this point, the EDMGSleft,176i
Referring to the above-described equations, iSTS may indicate a space-time stream index, and a subscript may indicate the length of each sequence. Additionally, the three zero (0) values that are positioned in the middle part of the equation presented above may denote a null carrier for a Direct Current (DC) offset removal.
Additionally, a frequency domain signal for each space-time stream configuring the EDMG-STF field for the EDMG OFDM transmission through a single channel may further include a predetermined number of zeros (0s) before and after the corresponding signal as a guard subcarrier. For example, 79 zeros (0s) may be added in front of (or before) the above-described equations, and 78 zeros (0s) may be added behind (or after) the above-described equations.
Meanwhile, as a solution for preventing unintentional beamforming, which occurs in a case where the same signal is transmitted from each stream when performing MIMO transmission, the sequences for each space-time stream that are proposed in the present invention may be designed to be mutually orthogonal.
Hereinafter, as an example that is applicable to the present invention, an example for generating the above-described sequences will be described in detail. According to the present invention, in order to generate the above-described sequence, the STA according to the present invention may use a sequence generating method, which will be described later on, or use sequence information (or table information) stored in a separate storage device, or use other diverse methods. Therefore, in order to generate an EDMG-STF field, the STA according to the present invention may use the detailed sequences that are described above. However, in this case, the STA according to the present invention may not necessarily use only the following method but may also use other methods so as to generate and use the above-described sequences.
For example, the EDMGSleft,176i
Firstly, the EDMGSleft,176i
Referring to Equation 5, A2i
A0i
B0i
Aki
Bki
Herein, k indicates an iteration index, and Wki
A Wki
In case of configuring the Wki
At this point, considering that the DMG-CEF has 3.12 dB, it may be verified that the EDMGD-STF according to the present invention has excellent performance.
3.2. 2 In Case of Channel Bonding, Sequence of an EDMG-STF for OFDM
In order to perform an EDMG OFDM transmission through a channel configured of 2 bonded channels (e.g., 4.32 GHz), a frequency sequence (or frequency domain signal), which is used for configuring the EDMG STF field for the iSTSth space-time stream, may be expressed as shown below in the following equation.
EDMG-STF386,386i
where “iSTS” is the space-time stream number and 1≤iSTS≤8
At this point, EDMGSleft,384i
As a more simplified version of Equation 7 and each sequence shown in
EDMGS−STF386,386i
where:
iSTS is the space-time stream number and 1≤iSTS≤8
At this point, the EDMGSleft,385i
Referring to the above-described equations, iSTS may indicate a space-time stream index (or spatial stream index), and a subscript may indicate the length of each sequence. Additionally, the three zero (0) values that are positioned in the middle part of the equation presented above may denote a null carrier for a Direct Current (DC) offset removal.
Meanwhile, as a solution for preventing unintentional beamforming, which occurs in a case where the same signal is transmitted from each stream when performing MIMO transmission, the sequences for each space-time stream that are proposed in the present invention may be designed to be mutually orthogonal.
Hereinafter, as an example that is applicable to the present invention, an example for generating the above-described sequences will be described in detail. In other words, in order to generate the above-described sequence, the STA according to the present invention may use a sequence generating method, which will be described later on, or use sequence information (or table information) stored in a separate storage device, or use other diverse methods. Therefore, in order to generate an EDMG-STF field, the STA according to the present invention may use the detailed sequences that are described above. However, in this case, the STA according to the present invention may not necessarily use only the following method but may also use other methods so as to generate and use the above-described sequences.
For example, the EDMGSleft,384i
Firstly, EDMGSleft,384i
Referring to Equation 9, A5i
A0i
B0i
Aki
Bki
Herein, k indicates an iteration index, and Wki
A Wki
Additionally, in Equation 10, B0i
Alternatively, referring to Equation 10, element values corresponding to an inverse order of the elements shown in Equation 10 may be applied to A0i
Meanwhile, elements satisfying mutual orthogonality may be applied as the Wki
In case of configuring the Wki
Referring to the above-described configurations, the EDMG-STF field transmit (or transmission) waveform in the time domain may be defined as shown below, in a case where the OFDM sampling rate corresponds to Fs=NCB*2.64 GHz and where the time period (or duration) corresponds to Ts=1/Fsns.
Herein, in case NCB=1, 2, 3, and 4, the NEDMG-STFTone is respectively equal to 88, 192, 296, and 400, and Qk indicates a kth spatial mapping matrix per subcarrier, and [ ]m,n indicates a matrix element of an mth row and an nth column. w(qTs) indicates a window function that is applied in order to mitigate the transitions between consecutive OFDM symbols. And, herein, the definition of the w(qTs) may be implementation dependent.
Firstly, a station (STA) according to the present invention generates an EDMG STF field, which is being transmitted in an OFDM mode (or transmitted for an OFDM packet) based on a number of channels, which are included in a bonded channel through which an EDMG PPDU is transmitted, and an index of a space-time stream (S3110).
At this point, an EDMG STF sequence for each space-time stream being included in the EDMG STF field may be configured to have a format of A, 0, 0, 0, B. More specifically, in case the number of bonded channels is equal to 1, A and B may be configured of 176-length sequences. And, in case the number of bonded channels is equal to 2, A and B may be configured of 385-length sequences.
At this point, a maximum of 8 space-time streams may be configured, and A and B for each space-time stream may be respectively orthogonal to the A and B of another space-time stream. In other words, A (or B) of a first space-time stream may be configured to be mutually orthogonal to A (or B) of a second space-time stream.
As a detailed example, in case the number of channels being included in the bonded channels is equal to 1, A and B for each space-time stream may be configured as shown in
Herein, the EDMG STF field may be configured of 6 OFDM symbol lengths.
According to the present invention, values other than 0 that are included in A and B may have a configuration, wherein values of a first sequence and a second sequence, each having a different length according to the number of channels being included in the bonded channels, are repeatedly positioned after being added with a weight according to a predetermined rule.
Firstly, the detailed technical characteristics corresponding to a case where the number of channels included in the bonded channel, through which the EDMG PPDU is transmitted, is equal to 1 will be described below.
Values other than 0 that are included in A and B may be set up to have a configuration, wherein values of the first sequence and the second sequence, each having a length of 11, are repeatedly positioned after being added with a weight according to a predetermined rule.
At this point, a maximum of 8 space-time streams may be configured, and the first sequence (A0i
A0i
B0i
Herein, values other than 0 that are included in A and B may be configured of sequences of (A2i
Aki
Bki
Additionally, the Wki
Herein, A and B of each space-time stream may include a 0, 0, 0 sequence between the values other than 0.
Most particularly, A of each space-time stream may include a 0 sequence, which is positioned in a foremost position, and a 0, 0 sequence, which is positioned in a rearmost position. And, B of each space-time stream may include a 0, 0 sequence, which is positioned in a foremost position, and a 0 sequence, which is positioned in a rearmost position. More specifically, as shown in
Secondly, the detailed technical characteristics corresponding to a case where the number of channels included in the bonded channel, through which the EDMG PPDU is transmitted, is equal to 2 will be described below.
Values other than 0 that are included in A and B may be set up to have a configuration, wherein values of the first sequence and the second sequence, each having a length of 3, are repeatedly positioned after being added with a weight according to a predetermined rule.
At this point, a maximum of 8 space-time streams may be configured, and the first sequence (A0i
A0i
B0i
Herein, values other than 0 that are included in A and B may be configured of sequences of A5i
Aki
Bki
Additionally, the Wki
Herein, A and B of each space-time stream may include a 0, 0, 0 sequence between the values other than 0.
Most particularly, A and B of each space-time stream may each include a 0, 0 sequence, which is positioned in a foremost position, and a 0, 0 sequence, which is positioned in a rearmost position. More specifically, as shown in
Thereafter, the station transmits the EDMG STF field being transmitted in the OFDM mode to another station through a space-time stream within the one or two bonded channels (S3120).
4. Device Configuration
A wireless device (100) of
The transmitting device (100) may include a processor (110), a memory (120), and a transmitting/receiving unit (130), and the receiving device (150) may include a processor (160), a memory (170), and a transmitting/receiving unit (180). The transmitting/receiving unit (130, 180) transmits/receives a radio signal and may be operated in a physical layer of IEEE 802.11/3GPP, and so on. The processor (110, 160) may be operated in the physical layer and/or MAC layer and may be operatively connected to the transmitting/receiving unit (130, 180).
The processor (110, 160) and/or the transmitting/receiving unit (130, 180) may include application-specific integrated circuit (ASIC), other chipset, logic circuit and/or data processor. The memory (120, 170) may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and/or other storage unit. When the embodiments are executed by software, the techniques (or methods) described herein can be executed with modules (e.g., processes, functions, and so on) that perform the functions described herein. The modules can be stored in the memory (120, 170) and executed by the processor (110, 160). The memory (120, 170) can be implemented (or positioned) within the processor (110, 160) or external to the processor (110, 160). Also, the memory (120, 170) may be operatively connected to the processor (110, 160) via various means known in the art.
As described above, the detailed description of the preferred exemplary embodiment of the present invention is provided so that anyone skilled in the art can implement and execute the present invention. In the detailed description presented herein, although the present invention is described with reference to the preferred exemplary embodiment of the present invention, it will be understood by anyone having ordinary skills in the art that diverse modifications, alterations, and variations can be made in the present invention. Therefore, the scope and spirit of the present invention will not be limited only to the exemplary embodiments of the present invention set forth herein. Thus, it is intended to provide the broadest scope and spirit of the appended claims of the present invention that are equivalent to the disclosed principles and novel characteristics of the present invention.
Although the present invention has been described in detail under the assumption that the present invention can be applied to an IEEE 802.11 based wireless LAN (WLAN) system, the present invention will not be limited only to this. It will be understood that the present invention can be applied to diverse wireless systems capable of performing data transmission based on channel bonding by using the same method as presented herein.
This application is a continuation of U.S. patent application Ser. No. 16/329,185, filed on Feb. 27, 2019, now U.S. Pat. No. 10,587,440, which is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2017/014698, filed on Dec. 14, 2017, which claims the benefit of U.S. Provisional Application Nos. 62/444,388, filed on Jan. 10, 2017, 62/468,381, filed on Mar. 8, 2017, 62/471,876, filed on Mar. 15, 2017, 62/486,994, filed on Apr. 19, 2017, and 62/491,270, filed on Apr. 28, 2017, the contents of which are all hereby incorporated by reference herein in their entirety.
Number | Name | Date | Kind |
---|---|---|---|
9793964 | Lomayev | Oct 2017 | B1 |
10117181 | Trainin et al. | Oct 2018 | B2 |
10244531 | Eitan et al. | Mar 2019 | B2 |
10250355 | Cordeiro et al. | Apr 2019 | B2 |
20140003475 | Xin | Jan 2014 | A1 |
20140003557 | Wu | Jan 2014 | A1 |
20150139137 | Seok | May 2015 | A1 |
20160249332 | Xin et al. | Aug 2016 | A1 |
20160309457 | Eitan | Oct 2016 | A1 |
20160323058 | Cordeiro et al. | Nov 2016 | A1 |
20160323861 | Cordeiro et al. | Nov 2016 | A1 |
20160323878 | Ghosh et al. | Nov 2016 | A1 |
20170033949 | Eitan | Feb 2017 | A1 |
20170033958 | Eitan | Feb 2017 | A1 |
20170070995 | Eitan | Mar 2017 | A1 |
20170134126 | Sanderovich | May 2017 | A1 |
20170257201 | Eitan | Sep 2017 | A1 |
20170265224 | Sanderovich | Sep 2017 | A1 |
20170324453 | Lomayev | Nov 2017 | A1 |
20180076979 | Lomayev | Mar 2018 | A1 |
20190089440 | Lomayev | Mar 2019 | A1 |
20190190754 | Kim et al. | Jun 2019 | A1 |
20190208463 | Lou et al. | Jul 2019 | A1 |
Number | Date | Country |
---|---|---|
103503395 | Jan 2014 | CN |
105072701 | Nov 2015 | CN |
1020130139790 | Dec 2013 | KR |
1020140098068 | Aug 2014 | KR |
1020140124370 | Oct 2014 | KR |
Entry |
---|
PCT International Application No. PCT/KR2017/014698, International Search Report dated Apr. 5, 2018, 4 pages. |
European Patent Office Application Serial No. 17891556.7, Office Action dated Sep. 17, 2020, 8 pages. |
Intellectual Property Office of India Application No. 201917008388, Office Action dated Oct. 7, 2020, 7 pages. |
IEEE Computer Society: “IEEE Standard for Low-Rate Wireless Personal Area Networks (WPANs),” IEEE Std 802.15.4-2015 (Revision of IEEE Std 802.15.4-2011, XP068106582, Dec. 2015, 709 pages. |
Kaushik, J. et al., Length 1344 LDPC codes for 11ay, doc.: IEEE 802.11-16/06760, XP068119570, May 2016, 32 pages. |
“Amendment 3-Information technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements—Part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) specifications—Enhancements for very high throughput in”, ISO/IEC/IEEE 8802-11:2012/AMD3:2014, XP082002290, Mar. 2014, 634 pages. |
United States Patent and Trademark Office U.S. Appl. No. 16/329,185, Notice of Allowance dated Aug. 22, 2019, 26 pages. |
Kim, J. et al., “EDMG-STF for OFDM”, doc.: IEEE 802.11-17/0732-00-00ay, May 2017, 12 pages. |
Stacey, R. et al., “Specification Framework for TGax”, doc.: IEEE 802.11-15/0132r15, Jan. 2016, 43 pages. |
The State Intellectual Property Office of the People's Republic of China Application Serial No. 201780061185.9, Office Action dated Mar. 5, 2021, 8 pages. |
Korean Intellectual Property Office Application No. 10-2019-7005822, Notice of Allowance dated Mar. 10, 2020, 2 pages. |
Korean Intellectual Property Office Application No. 10-2019-7005822, Office Action dated Aug. 1, 2019, 5 pages. |
European Patent Office Application Serial No. 17891556.7, Search Report dated Sep. 18, 2019, 6 pages. |
Cordeiro, C. et al., “Specification Framework for TGay,” IEEE P802.11 Wireless LANs, doc.: IEEE 802.11-15/01358r9, Nov. 2015, 90 pages. |
IEEE: “IEEE Standard for Information Technology—Telecommunications and Information Exchange Between System—Local and Metropolitan Area Networks—Specific Requirements—Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications,” IEEE Std 802.11-2016 (Revision of IEEE Std 802.11-2012, Dec. 2016, 3534 pages. |
IEEE: “Draft Standard for Information Technology—Telecommunications and Information Exchange Between System—Local and Metropolitan Area Networks—Specific Requirements—Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications—Amendment 7: Enhanced throughput for operation in license-exempt bands above 45GHZ,” IEEE P802.11ay/D0.1, Jan. 2017, 181 pages. |
Lomayev, A. et al., “EDMG STF and CEF Design for SC PHY in 11ay,” doc.: IEEE 802.11-16/0994r0, Jul. 2016, 40 pages. |
Coffey, S. et al., “Joint Proposal: High throughput extension to the 802.11 Standard: PHY,” IEEE P802.11 Wireless LANs, doc.: IEEE 802.11-05/1102r1, Nov. 2005, 30 pages. |
Lomayev, A. et al., “SC PHY EDMG-CEF Design for Channel Bonding x3,” doc.: IEEE 802.11-16/1207r0, Sep. 2016, 15 pages. |
European Patent Office Application Serial No. 21185462.5, Search Report dated Oct. 18, 2021, 11 pages. |
LG Electronics, “EDMG STF for OFDM in 2,3,4CB”, IEEE 802.11-17/1028-00-00ay, Jul. 2017, 18 pages. |
Number | Date | Country | |
---|---|---|---|
20200136871 A1 | Apr 2020 | US |
Number | Date | Country | |
---|---|---|---|
62444388 | Jan 2017 | US | |
62468381 | Mar 2017 | US | |
62471876 | Mar 2017 | US | |
62486994 | Apr 2017 | US | |
62491270 | Apr 2017 | US |
Number | Date | Country | |
---|---|---|---|
Parent | 16329185 | US | |
Child | 16726144 | US |