CN106658722B

CN106658722B - Method and device for indicating frequency resources in wireless local area network

Info

Publication number: CN106658722B
Application number: CN201510740079.6A
Authority: CN
Inventors: 刘乐; 李云波; 李彦淳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-11-03
Filing date: 2015-11-03
Publication date: 2020-07-28
Anticipated expiration: 2035-11-03
Also published as: WO2017076068A1; CN106658722A

Abstract

The invention discloses a method for indicating frequency resources in a wireless local area network, which comprises the following steps: the method comprises the steps that a station generates a physical layer protocol data unit (PPDU) which comprises a signaling field B, the signaling field B indicates that a sliding 242 Resource Unit (RU) is adopted in one or more 20MHz channels, and the sliding 242RU comprises 242 data subcarriers. The invention also provides a device for indicating the frequency resources, and by the method, the influence of adjacent channel interference can be overcome, and the frequency resources of 242-RU are maintained to be allocated to the users with large data requirements.

Description

Method and device for indicating frequency resources in wireless local area network

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for indicating frequency resources in a wireless local area network.

Background

As data traffic and user number have increased dramatically, the existing W L AN (Wireless L environmental area network, WLAN for short) standards (e.g., 802.11n/ac) have faced bottlenecks in throughput and user access number, and thus the Institute of Electrical and Electronic Engineers (IEEE) has established the TGax working group and began to define the W L AN standard of the next generation.

The next generation W L AN standard 802.11ax may adopt the following technical characteristics of 4X symbols and a plurality of discontinuous 20MHz channel bonding, wherein 1 4X symbol accommodates 256 subcarriers, TGax discloses subcarrier design of 4X symbols under different bandwidths (including positions of data subcarriers, pilot subcarriers and remaining subcarriers), the existing W L AN standard adopts 1X symbol, and the 1X symbol accommodates 64 subcarriers.

In addition, the existing 802.11ac standard supports 4 bandwidth modes, specifically 20MHz, 40MHz, 80MHz, and 160(80+80) MHz, except that the bandwidth mode of 80+80 is two discontinuous channel bonding, and the remaining bandwidth modes are continuous 20MHz channel bonding. However, 802.11ax supports multiple discontinuous 20MHz channel bonded bandwidth modes for user access flexibility.

Specifically, a scenario is described in which a 4X symbol subcarrier design is applied to a bandwidth mode of a discontinuous 20MHz channel bonding, where an 80MHz bandwidth includes channels 1-4, where the bandwidths of channels 1-4 are all 20 MHz.

Channels

1, 3 and 4 are used by BSS1 (Basic Services Set), and channel 2 is used by BSS 2. Because 4X symbols lack sufficient subcarrier spacing between different 20MHz channels, BSS1 and BBS2 may generate Adjacent Channel Interference (ACI).

Disclosure of Invention

In view of this, the main objective of the present invention is to provide a method and an apparatus for indicating frequency resources in a wireless local area network, in which a new subcarrier design is adopted for a 4X symbol, so that, for a scenario in which the 4X symbol subcarrier design is applied to a discontinuous bandwidth mode of 20MHz channel bonding, adjacent channel interference between different BSSs can be overcome.

In a first aspect, an embodiment of the present invention provides a method for indicating frequency resources in a wireless local area network, including:

the method comprises the steps that a station generates a physical layer protocol data unit (PPDU) which comprises a signaling field B, the signaling field B indicates that a sliding 242 Resource Unit (RU) is adopted in one or more 20MHz channels, and the sliding 242RU comprises 242 data subcarriers.

And the station sends the PPDU.

The first aspect comprises three possible implementations.

In implementation 1, the sliding 242RU includes: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth of the 80MHz bandwidth subcarrier design.

Optionally, the number of partial subcarriers in the middle region in the subcarrier design under the 80MHz bandwidth is x, 7< ═ x < ═ 26, and x is an integer.

Optionally, the number of partial subcarriers in the middle region in the subcarrier design under the 80MHz bandwidth is x, 7< ═ x < ═ 13, and x is an integer.

In implementation 2, the sliding 242RU includes: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth subcarrier design.

In implementation 3, the sliding 242RU includes: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 40MHz bandwidth subcarrier design.

With this method of frequency resource indication, adjacent channel interference can be overcome and the number of data subcarriers in the sliding 242RU and the existing 242RU can be ensured to be kept unchanged.

In a second aspect, an embodiment of the present invention provides an apparatus for indicating frequency resources in a wireless local area network, including:

a signal processor, configured to generate a physical layer protocol data unit (PPDU), where the PPDU includes a signaling field B, where the signaling field B indicates that a sliding 242 Resource Unit (RU) is used in one or more 20MHz channels, and the sliding 242RU includes 242 data subcarriers.

A transceiver for transmitting the PPDU.

The second aspect comprises three possible implementations.

The invention redesigns the mapping relation of the sub-carriers, adopts the sub-carrier mapping of the sliding 242RU, takes the (13+13) RU near the 7DC tone under the bandwidth of 80MHz as the newly added part of the sliding 242RU, and sets part of the sub-carriers in the existing 242RU as the protection sub-carriers (not carrying data). In the above way, adjacent channel interference is overcome, so that the number of data subcarriers in the sliding 242RU is kept unchanged from that in the existing 242RU, and by setting wider guard subcarriers.

Drawings

Fig. 1 is a diagram of a tone plane designed for subcarriers with 20MHz bandwidth.

Fig. 2 is a diagram of a conventional tone plane designed for subcarriers with a bandwidth of 40 MHz.

Fig. 3 is a diagram of a conventional tone plane designed for subcarriers with a bandwidth of 80 MHz.

Fig. 4 is a diagram of an application scenario of the present invention.

Fig. 5 is a block diagram of a possible physical layer data unit to which the present invention is applied.

FIG. 6 is a flowchart of the method of embodiment 1 of the present invention.

Fig. 7 shows a first bandwidth pattern according to embodiment 1 of the present invention.

Fig. 8 is a RU distribution diagram in the first bandwidth mode according to example 1 of the present invention.

Fig. 9 shows RU distribution scenario 1 in the first bandwidth mode of example 1 of the present invention.

Fig. 10 shows RU distribution 2 in the first bandwidth mode according to example 1 of the present invention.

Fig. 11 shows RU distribution 3 in the first bandwidth mode according to example 1 of the present invention.

Fig. 12 shows a second bandwidth pattern according to embodiment 1 of the present invention.

Fig. 13 is a RU distribution diagram in the second bandwidth mode of example 1 of the present invention.

Fig. 14 shows a third bandwidth mode according to embodiment 1 of the present invention.

Fig. 15 is a RU distribution diagram in the third bandwidth mode according to embodiment 1 of the present invention.

Fig. 16 shows a fourth bandwidth mode according to embodiment 1 of the present invention.

Fig. 17 is a RU distribution diagram in a fourth bandwidth mode according to embodiment 1 of the present invention.

Fig. 18 shows RU distribution scenario 1(80MHz tone plane) of embodiment 1, scheme 2 of the present invention.

Fig. 19 is RU distribution scenario 2(20MHz tone plane) of scheme 2 of example 1 of the present invention.

Fig. 20 shows RU distribution scenario 1(20MHz tone plane) of embodiment 1, scheme 3 of the present invention.

Fig. 21 shows RU distribution scenario 2(40MHz tone plane) of scheme 3 of example 1 of the present invention.

Fig. 22 is a block diagram of a physical device in embodiment 2 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the embodiments described below are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Currently, IEEE has disclosed a tone plane (subcarrier allocation pattern) for an 802.11ax system, which supports OFDMA transmission, wherein a tone plane of 20/40/80MHz bandwidth is as shown in fig. 1-3. The tone plane specifies positions of different size frequency Resource Units (RU) composed of a guard subcarrier (edge tone), a data subcarrier (data tone) and a direct current subcarrier (DC tone), and also specifies positions of a pilot subcarrier (pilot tone) and a remaining space subcarrier (leftover tone). Wherein 26-tone RUs, 52-tone RUs, 106-tone RUs, 242-tone RUs, 484-tone RUs and 996-tone RUs may be allocated using OFDMA transmissions.

Specifically, fig. 1 shows a tone plane with a bandwidth of 20MHz, where the bandwidth of 20MHz includes 256 subcarriers, and the sequence numbers of the subcarriers are (-128, -127 … 0,1, … 127). If the subcarriers in the 20MHz bandwidth are in the smallest unit of RU-26, then the positions of the pilot subcarriers are ± 10, + -22, + -36, + -48, + -62, + -76, + -90, + -102, + -116. If the subcarriers in the 20MHz bandwidth are in the smallest unit of RU-52, then the positions of the pilot subcarriers are ± 10, + -22, + -36, + -48, + -62, + -76, + -90, + -102, + -116. If the subcarriers in the 20MHz bandwidth are the smallest units in RU-106and RU-242, then the positions of the pilot subcarriers are ± 22, + -48, + -90, + -116.

Specifically, fig. 2 shows a tone plane with a bandwidth of 40MHz, where the bandwidth of 40MHz includes 512 subcarrier positions and the sequence number of the subcarrier is (-256, … 0,1, … 255). If the subcarriers in the 40MHz bandwidth are the smallest units in RU-26 and RU-52, then the pilot subcarriers are located at ± 10, ± 24, ± 36, ± 50, ± 64, ± 78, ± 90, ± 104, ± 116, ± 130, ± 144, ± 158, ± 170, ± 184, ± 198, ± 212, ± 224, ± 238. If the subcarriers in the 40MHz bandwidth are the smallest units of RU-106and RU-242, then the positions of the pilot subcarriers are ± 10, ± 36, ± 78, ± 104, ± 144, ± 170, ± 212, ± 238.

Specifically, fig. 3 shows a tone plane with a bandwidth of 80MHz, where the bandwidth of 80MHz includes 1024 subcarrier locations, and the sequence number of the subcarrier is (-512, … 0,1, … 511). If the subcarriers in the 80MHz bandwidth are the smallest units in RU-26 and RU-52, then the pilot subcarriers are located + -10, + -24, + -38, + -50, + -64, + -78, + -92, + -104, + -118, + -130, + -144, + -158, + -172, + -184, + -198, + -212, + -226, + -238, + -252, + -266, + -280, + -292, + -306, + -320, + -334, + -346, + -360, + -372, + -386, + -400, + -414, + -426, + -440, + -454, + -468, + -480, + -494. If the subcarriers in the 80MHz bandwidth are the smallest units in RU-106and RU-242 and RU-484, then the locations of the pilot subcarriers are ± 24, +50, +92, +118, +158, +184, +226, +252, + 266, + 292, + 334, + 360, + 400, + 426, + 468, ± 494. If the subcarriers in the 80MHz bandwidth are in RU-996 as the smallest unit, then the positions of the pilot subcarriers are ± 24, + -92, + -158, + -226, + -266, + -334, + -400, + 468.

For tone planes with bandwidths above 80MHz, a combination of tone planes with bandwidths above 80MHz is employed. For example: and the tone plan with the bandwidth of 160MHz adopts two segments of tone plans with the bandwidth of 80 MHz.

It should be noted that, the RU-26, 26-tone RU and 26RU mentioned in this patent are the same meaning, and all represent resource units containing 26 data subcarriers. In addition, the frequency interval Δ f between the subcarriers is 20MHz/256, 78.125 KHz.

The embodiment of the invention can be applied to a Wireless local Area Network (English: Wireless L Area Network, abbreviated as W L AN), the standard adopted by the W L AN is IEEE (Institute of Electrical and electronic Engineers, Chinese) 802.11 series, the W L AN can comprise a plurality of Basic Service Sets (BSS), the Network nodes in the Basic Service sets are STA (STA), the sites comprise AP (AP, Access Point) and Non-AP (Non Access Point), and each Basic Service Set can comprise AN AP and a plurality of Non-AP STAs related to the AP.

The AP is a bridge connected with a network and a Wireless network, and is mainly used for connecting various Wireless network clients together and then connecting the Wireless network to the Ethernet.

The Station may support 802.11ax standard, and further optionally, the Station supports multiple W L AN standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a.

Fig. 4 is a schematic system diagram of a deployment scenario of W L AN according to the present invention, which includes two APs and 4 STAs, where AP1 communicates with STA1 and STA2, respectively, and is defined as BSS1 (english: Basic Services Set, chinese: Basic service Set), and AP2 communicates with STA3 and STA4, respectively, and is defined as BSS 2.

The AP can perform uplink and downlink transmission with different STAs on different time-frequency resources, and the uplink and downlink transmission of the AP can adopt different modes, such as AN OFDMA Single-User Multiple-Input Multiple-Output (SU-MIMO) mode or AN OFDMA Multi-User Multiple-Input Multiple-Output (MU-MIMO) mode.

The AP may simultaneously transmit a downlink Physical layer Protocol Data Unit (PPDU) to a plurality of stations or a plurality of station groups, where the plurality of stations may refer to stations in an SU-MIMO mode and the plurality of station groups may refer to station groups in an MU-MIMO mode.

Specifically, as shown in fig. 5, the PPDU sent by the AP includes a Header Field (Header) and a Data Field of a Physical layer Convergence protocol (Physical L a layer Convergence protocol, abbreviated as P L CP), where the P L0 CP Header includes a legacy Preamble (L1-Preamble) and a control Field, the legacy Preamble includes L2-STF (L3 about 3 edge Short Field, chinese: legacy Short Training Field), L-L TF (L edge L on Training Field, chinese: legacy long Training Field), L-SIG (L edge Signaling Field, chinese: legacy Signaling Field), and R L-SIG (legacy L Signaling Field, chinese: repeat Signaling Field), where the control Field includes a High efficiency Signaling Field (overhead a) and a Data Field, and the High efficiency Signaling Field is a portion of a Header Field (overhead) and a portion of an overhead portion of a Physical layer Convergence protocol (P L CP), and the Data Field are not specifically referred to as an overhead portion of an overhead Signaling Field.

It should be noted that, in the possible W L AN standard in the future, the names of the standard or the names of the fields, etc. may be replaced by any other names, which should not be considered to limit the scope of the present invention, and the description of the PPDU is equally applicable to all embodiments.

Example 1

Embodiment 1 of the present invention provides a channel indication method applied to a W L AN, where the method may be applied to a station, for example, AP1-AP2 and STA1-STA4 in fig. 4, and the station may support a next generation W L AN standard, for example, 802.11ax standard fig. 6 is AN exemplary block diagram of the data transmission method, and the specific steps are as follows:

step 101: the method comprises the steps that a station generates a physical layer protocol data unit (PPDU) which comprises a signaling field B, the signaling field B indicates that a sliding 242 Resource Unit (RU) is adopted in one or more 20MHz channels, and the sliding 242RU comprises 242 data subcarriers.

Step 102: and the station sends the PPDU.

Specifically, the subcarrier design of the sliding 242RU includes three schemes.

Specifically, the subcarrier mapping of the sliding 242RU is specifically related to that (13+13) RUs near 7DC tone in the 80MHz bandwidth are used as a new added part of the sliding 242RU, and part of subcarriers in the existing 242RU are set as guard subcarriers (not carrying data). By setting wider guard subcarriers in the manner described above, adjacent channel interference is overcome, such that the number of data subcarriers in the sliding 242RU remains unchanged from the existing 242 RU.

In scheme 1, the sliding 242RU uses a part of subcarriers of a middle region designed by subcarriers with 80MHz bandwidth and a part of subcarriers of 20MHz bandwidth designed by subcarriers with 80MHz bandwidth.

The sliding 242RU in scheme 2 uses a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth subcarrier design.

In scheme 3, the sliding 242RU uses a part of subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a part of subcarriers of the 40MHz bandwidth subcarrier design.

Scheme 1 case 1

In the case 1 of the scheme 1, which is described in detail with reference to fig. 7 and 8, the BSS1 occupies channels CH2-CH4, and the BBS2 occupies channel CH 1. The physical bandwidth of each channel is 20 MHz. Thus, the BBS2 employs a tone plane of 20MHz, and the BBS1 employs a tone plane of 80 MHz. BSS2 occupies CH1, including the left 6 edge tones and 242RU (the RU contains 3 DC tones, so the total number of subcarriers is 245), BSS1 occupies CH2-CH4, where CH2 includes 242RU, 13RU and 3 DC tones (note: the middle portion has 7DC tones, divided by the middle line, 3 on the left, and 4 on the right). Therefore, the channel spacing between BSS1 and BSS2 is (512-6-245-. With the above design, adjacent channel interference between BSS1 and BSS2 will result.

The specific scheme of the subcarrier design of the sliding 242RU adopted by the invention is as follows: without changing the toneplan at 80MHz, x subcarriers near CH1 are removed from the 242-RU on CH2, and the remaining (242-x) subcarriers and the x subcarriers near CH2 in the middle (13+13) -tone RU at 80MHz are combined into a new 242-tone RU. Where 234 data subcarriers and 8 pilot subcarriers are used, consistent with a conventional 242-tone RU.

The pilot locations in the 242-RU on conventional CH2 are-252, -226, -184, -158, -118, -92, -50, -24} and the pilot locations in the middle (13+13) -tone RU are-10, +10, taking out 8 of-226, -184, -158, -118, -92, -50, -24, -10} as pilots in the newly defined 242-tone RU on CH 2.

Specifically, the number of partial subcarriers in the middle region in the subcarrier design tone plane under the 80MHz bandwidth is x, 7< ═ x < ═ 26, and N is an integer. The minimum value of x-7 ensures that pilot at position-252 is not within the newly defined 242-RU, while x-26 ensures that the new 242-RU does not exceed the range of the middle (13+13) -tone RU.

Specific examples are as follows:

as shown in fig. 9, x ═ 26, i.e., (242-26) -tone and intermediate (13+13) -tone are combined into a new 242-RU. The 242-RU of 20MHz802.11ax user on CH1 and the newly defined 242-RU on CH2 in 80MHz are increased to 29 sub-carriers apart, thus avoiding the influence of ACI. Here the pilot location within the 242-tone RU newly defined on CH2 may be { -226, -184, -158, -118, -92, -50, -24, -10}, while data is transmitted at the +10 location, for 234 data tones; or the pilot locations within the newly defined 242-tone RU may be { -226, -184, -158, -118, -92, -50, -24, +10}, while data is transmitted at-10 locations, for a total of 234 data tones.

As shown in fig. 10, x ═ 13, i.e., (242-13) -tone and 13-tone in the middle near CH2 are combined into a new 242-RU, separated by 4 DC-tones from CH2 and CH 3. No data is transmitted on the remaining right 13-tone. The interval between the 242-RU of 20MHZ802.11ax users on CH1 and the newly defined 242-RU on CH2 in 80MHz is increased to 16 subcarriers, thereby avoiding the influence of ACI and ensuring that the newly defined 242-RU does not need to cross the middle DC.

As shown in fig. 11, x ═ 8, i.e., 8-tone near CH2 in the (242-8) -tone and middle (13+13) -RU are combined into a new 242-RU. The 5-tone and 4DC on the remaining CH2 act as additional guard subcarriers, while the 13-tone on the right does not transmit data. The interval of the 242-RUs of 20MHz802.11ax users on CH1 and the newly defined 242-RUs on CH2 in 80MHz is increased to 11 subcarriers (the 11 subcarriers are the minimum interval of the 242-RUs on two 20MHz of 802.11 ax), thereby avoiding the influence of ACI, ensuring that the newly defined 242-RUs do not need to cross the middle DC, and simultaneously increasing the guard subcarrier interval between CH2 and DC.

Scheme 1 case 2

To explain scenario 1, case 2 in detail with reference to fig. 12 and fig. 13, BSS1 occupies channels CH1-CH3, and BBS2 occupies channel CH 4. The physical bandwidth of each channel is 20 MHz. Thus, the BBS2 employs a tone plane of 20MHz, and the BBS1 employs a tone plane of 80 MHz. BSS2 occupies CH4, including the right 5 edge tones and 242RU (the RU contains 3 DC tones, so the total number of subcarriers is 245), BSS1 occupies CH2-CH4, where CH3 includes 242RU, 13RU and 4DC tones (note: the middle portion has 7DC tones, divided by the middle line, 3 on the left and 4 on the right). Therefore, the channel spacing between BSS1 and BSS2 is (512-5-245-. With the above design, adjacent channel interference between BSS1 and BSS2 will result.

The specific scheme of the subcarrier design of the sliding 242RU adopted by the invention is as follows: without changing the 80MHz tone plane, x subcarriers near CH4 are removed from the 242-RU on CH3, and the remaining (242-x) subcarriers and the x subcarriers near CH3 in the 80MHz middle (13+13) -tone RU are combined into a new 242-tone RU. Where 234 data subcarriers and 8 pilot subcarriers are used, consistent with a conventional 242-tone RU.

The pilot locations in the 242-RU on conventional CH3 are { +24, +50, +92, +118, +158, +184, +226, +252} and the pilot locations in the middle (13+13) -tone RU { -10, +24, +50, +92, +118, +158, +184, +226} take out 8 as pilots in the newly defined 242-tone RU on CH 3.

Specifically, the number of partial subcarriers in the middle region in the subcarrier design tone plane under the 80MHz bandwidth is x, 7< ═ x < ═ 26, and N is an integer. The minimum value of x-7 ensures that pilot at position +252 is not within the newly defined 242-RU, while x-26 ensures that the new 242-RU does not exceed the range of the middle (13+13) -tone RU.

The specific situation of the number of the partial subcarriers is the same as that in fig. 9 to 11, and is not described again.

Scheme 1 case 3

To explain scenario 1, case 3 in detail with reference to fig. 14 and fig. 15, BSS1 occupies channels CH1 and CH3, BBS2 occupies channel CH4, and BSS3 occupies channel 2. The physical bandwidth of each channel is 20 MHz. Thus, BBS2 and BSS3 employ a 20MHz tone plane, and BBS1 employs an 80MHz tone plane, occupying CH1 and CH3, where CH1 contains the left 12 edge tones and 242 RUs. BSS3 occupies CH2, with a 20MHz tone plane, including the left 6 edge tones and 242RU (the RU includes 3 DC tones, so the total number of subcarriers is 245) and the right 5 edge tones, so the signal of BSS3 in CH2 is separated from the signal of BSS1 in CH1 by (6+2) ═ 8 Δ f, and the signal of BSS3 in CH2 is separated from the signal of BSS1 in CH3 by (5+4+13) ═ 22 Δ f, so the signal of BSS3 in CH2 is not affected by ACI. However, the distance between the signal of BSS1 in CH3 and the signal of BSS2 in CH4 is (512-4-13-242-245-5) ═ 3 Δ f, and with the above design, adjacent channel interference between BSS1 and BSS2 will result.

Specifically, the number of partial subcarriers in the middle region in the subcarrier design under the 80MHz bandwidth is x, 7< ═ x < ═ 13, and N is an integer. The minimum value of x-7 ensures that pilot at position +252 is not within the newly defined 242-RU, while x-13 ensures that the new 242-RU does not enter the range of CH2, since half of the middle (13+13) -tone RU already belongs to the range of unoccupied CH 2.

Scheme 1 case 4

To explain scenario 1, case 4 in detail with reference to fig. 16 and fig. 17, BSS1 occupies channels CH2 and CH3, BBS2 occupies channel CH4, and BSS3 occupies channel CH 1. The physical bandwidth of each channel is 20 MHz. Thus, BBS2 and BSS3 employ a toneplane of 20MHz, BBS1 employ a tone plane of 80MHz, occupying CH2 and CH3, where CH1 contains the left 6 edge tones and 242 RUs (the RU contains 3 DC tones, so the total number of subcarriers is 245). BSS2 occupies CH4, with a 20MHz toneplan, including 242 RUs (which includes 3 DC tones, and thus the total number of subcarriers is 245) and the right 5 edgetones, so that the signal of BSS1 in CH2 is separated from the signal of BSS3 in CH1 by (512-6-245-242-13-3) 3 Δ f, and the signal of BSS1 in CH3 is separated from the signal of BSS2 in CH4 by (512-5-245-242-4-13) 3 Δ f, so with the above design, adjacent channel interference between BSS1 and BSS2, BSS1 and 3 will result.

The specific scheme of the subcarrier design of the sliding 242RU adopted by the invention is as follows: without changing the 80MHz tone plane, x subcarriers near CH1 are removed from the 242-RUs in CH2, 7 ═ x < ═ 13, and the remaining (242-x) subcarriers and the x subcarriers near CH2 in the 80MHz middle (13+13) -tone RU are combined into a new 242-tone RU. Where 234 data subcarriers and 8 pilot subcarriers are used, consistent with a conventional 242-tone RU.

Similarly, x subcarriers near CH4 are removed from the 242-RUs in CH3, 7 ═ x < ═ 13, and the remaining (242-x) subcarriers and the x subcarriers near CH3 in the 80MHz middle (13+13) -tone RU are combined into one new 242-tone RU. Where 234 data subcarriers and 8 pilot subcarriers are used, consistent with a conventional 242-tone RU. The values of x on both sides are the same, so that certain symmetry can be kept.

It should be noted that, the subcarrier design for the sliding 242RU is indicated by the signaling field B, and may be applied to a downlink multiuser transmission flow and an uplink multiuser transmission flow, which are explained separately below.

The AP sends the downlink multi-user transmission process to a plurality of STAs at the same time, and the signaling field B of the PPDU transmitted by the downlink multi-user indicates the subcarrier design of the sliding 242RU, and the indication modes comprise two modes.

Indication mode 1, the SIGB indication method is adopted, the SIGB includes two parts of SIB common (user common information) and dedicated (user specific information), the SIGB common part includes resource allocation information of CH1/2/3/4, and each CH respectively indicates the allocated RU combination mode and the number of SU/MU-MIMO users allocated on 26/52/106/242/484/996-tone RU, and the SIGB dedicated part includes scheduling information of each user of the corresponding channel, such as user identification number (STA ID), Modulation Coding (MCS), coding type (L DPC/BCC), number of spatial streams and stream number sequence number, etc. for example, the channel bonding mode of CH2+ CH3+ CH4 in case 1, conventional 242-RU that causes ACI is not used on CH2, but new subcarrier design of sliding 242-RU is adopted.

Specifically, the SIGB common indicates to CH2 that 242-RU and middle (13+13) -RU allocations of 80MHz tone plan are allocated. It is necessary in HE-SIG-B common to indicate whether a certain user is allocated according to the specified RU location and size, such as the size and location specified by 26/52/106/242/484/996/2 × 996, whether a user is allocated to the 242-RU on CH2, and whether another user is allocated to the middle (13+13) -RU. Here, if both the 242-RU and the middle (13+13) -RU on CH2 are assigned to the same user, it indicates a new sliding 242-RU subcarrier design that is pre-specified for that user. The value of x in the middle (13+13) -RU (for example, x is 8 or 13 or 26) is preset by the transmitting and receiving ends according to the standard.

Specifically, the information indicating the allocated users is repeated at the 242-RU of CH2 and the middle (13+13) -RU of 80MHz in SIGB decoded, i.e., the 242-RU of CH2 and the middle (13+13) -RU indicate simultaneously the subcarrier design allocated to the same user to represent that a new sliding 242-RU is allocated.

Indication mode 2: if the bandwidth indication field of the SIGA contains a channel bonding mode indication, a new 242-RU allocation may be implicitly indicated in conjunction with the SIGB indication 242-RU allocation. For example, the channel bonding mode of CH2+ CH3+ CH4 of case 1, instead of causing the conventional 242-RU allocation of ACI, a new sliding 242-RU subcarrier design is employed on CH 2.

Specifically, if the channel bonding mode selection in SIGA indicates a combination of CH2+ CH3+ CH4, while the indication in sigbocommon indicates that CH2 allocates a 242-RU, then the subcarrier design that CH2 in combination with the middle (13+13) -RU becomes the new sliding 242-RU is implicitly indicated.

Specifically, 242-RU in CH2 in the SIGB dedicated indicates the information of the allocated user, and the indication need not be repeated again in the dedicated part corresponding to the (13+13) -RU.

In the uplink multi-user transmission process, a plurality of STAs simultaneously send uplink multi-user transmission data packets under the scheduling of an AP trigger frame, and the sliding 242RU subcarrier design is indicated in the AP trigger frame, wherein the indication method comprises 2 types.

Indication mode 1, the Trigger frame includes the special scheduling information of each user on each CH, such as the user identification number (STA ID), the starting position of the scheduling resource block, SU/MU-MIMO transmission mode, Modulation Coding (MCS), coding type (L DPC/BCC), the number of spatial streams and the serial number of the streams, etc. for example, in case 1, the channel bonding mode of CH2+ CH3+ CH4 is adopted, the conventional 242-RU allocation of ACI is not caused on CH2, but the new sliding 242-RU subcarrier design is adopted, then the allocated user information is indicated on the 242-RU on CH2, and the allocated user information is repeatedly indicated on the middle (13+13) -RU.

Indication mode 2: the bandwidth indication field in the Trigger frame contains a channel bonding mode indication, and if channel bonding indicates a channel combination of CH2+ CH3+ CH4 and 242-RUs are allocated on CH2, the combination of CH2 and the middle (13+13) -RU is implicitly indicated as being a new 242-RU. The user-specific indication information corresponding to the 242-RU on CH2 indicates allocated user information, and there is no need to repeat the indication of allocated user information on the middle (13+13) -RU.

In the new sliding 242-RU subcarrier design in the multi-user transmission process, the value of x in the middle (13+13) -RU (for example, x is 8 or 13 or 26) is preset by the transmitting and receiving ends according to the standard.

In the scheme 1 of the embodiment of the invention, the sliding 242RU subcarrier design is adopted, including the partial subcarriers in the middle area of the 80MHz bandwidth subcarrier design and the partial subcarriers in the 20MHz bandwidth of the 80MHz bandwidth subcarrier design, by adopting the design, the influence of adjacent channel interference can be overcome, and the allocation of the 242-RU frequency resources to the users with large data requirements is maintained.

Scheme 2 case 1

In the case 1 of the scheme 2, which is described in detail with reference to fig. 7 and 8, the BSS1 occupies channels CH2-CH4, and the BBS2 occupies channel CH1, and the physical bandwidth of each channel is 20 MHz. Thus, the BBS2 employs a tone plane of 20MHz, and the CH2 in the BBS1 employs a tone plane of 20 MHz. BSS2 occupies CH1, including the left 6 edge tones and 242RU (which contains 3 DC tones, so the total number of subcarriers is 245) and the right 5 edge tones, BSS1 occupies CH2-CH4, wherein CH2 includes the left 6 edge tones and 242RU (which contains 3 DC tones, so the total number of subcarriers is 245) and the right 5 edge tones. Therefore, the channel spacing between BSS1 and BSS2 is (5+6) ═ 11 Δ f. With the above design, adjacent channel interference between BSS1 and BSS2 can be overcome.

Furthermore, in case 1 of scenario 2, CH3 and CH4 in BSS1 may adopt an 80MHz tone plane design, as shown in fig. 18. CH3 and CH4 in BSS1 may also be designed with a 20MHz tone plane, as shown in fig. 19.

Scheme 2 case 2

To explain scenario 2 in detail with reference to fig. 12 and fig. 13, BSS1 occupies channels CH1-CH3, and BBS2 occupies channel CH 4. The physical bandwidth of each channel is 20 MHz. Thus, the BBS2 employs a 20MHz tone plane, and the CH1-CH3 in BBS1 all employ a 20MHz tone plane, with no (13+13) -tone RU in between. There are 3 DC subcarriers in the middle of the 20MHz 242-RU where no data is transmitted, and 234 data subcarriers and 8 pilot subcarriers, consistent with a conventional 242-tone RU. The position of the pilots is also relatively consistent within each 20 MHz. Therefore, the channel spacing between BSS1 and BSS2 is (5+6) ═ 11 Δ f. With the above design, adjacent channel interference between BSS1 and BSS2 can be overcome.

Scheme 2 case 3

To explain scenario 2, case 3 in detail with reference to fig. 14 and fig. 15, BSS1 occupies channels CH1 and CH3, BBS2 occupies channel CH4, and BSS3 occupies channel 2. The physical bandwidth of each channel is 20 MHz. Thus, BBS2 and BSS3 use a 20MHz tone plane, and BBS1 uses a 20MHz tone plane, occupying CH1 and CH 3. BSS3 occupies CH2, using a toneplan of 20 MHz. Therefore, the signal of BSS3 in CH2 is separated from the signal of BSS1 in CH1 by (6+5) 11 Δ f, and the signal of BSS3 in CH2 is separated from the signal of BSS1 in CH3 by (5+6) 11 Δ f, so that the signal of BSS3 in CH2 is not affected by ACI. With the above design, the adjacent channel interference between BSS1 and BSS2, and between BSS3 and BSS1, will be overcome.

Scheme 2 case 4

To explain scenario 2, case 4 in detail with reference to fig. 16 and fig. 17, BSS1 occupies channels CH2 and CH3, BBS2 occupies channel CH4, and BSS3 occupies channel CH 1. The physical bandwidth of each channel is 20 MHz. Thus, the BBS2 and BSS3 employ a 20MHz tone plane, and the BBS1 employ either a 20MHz tone plane or a 40MHz tone plane.

If the BBS1 adopts a tone plane of 20MHz, as shown in FIG. 20. The signal of BSS3 in CH1 is spaced from the signal of BSS1 in CH2 by (6+5) ═ 11 Δ f, and the signal of BSS1 in CH3 is spaced from the signal of BSS2 in CH4 by (5+6) ═ 11 Δ f, so that the adjacent channel interference between BSS1 and BSS2 and between BSS3 and BSS1 can be overcome.

It should be noted that, for the subcarrier design indication of the sliding 242RU, scheme 2 is the same as scheme 1, and is not described again.

In the scheme 2 of the embodiment of the present invention, the sliding 242RU subcarrier design is adopted, including the partial subcarriers in the middle area of the 80MHz bandwidth subcarrier design and the partial subcarriers in the 20MHz bandwidth subcarrier design, by adopting the above design, the influence of adjacent channel interference can be overcome, and the 242-RU frequency resources are maintained to be allocated to the users with large data requirements.

Scheme 3

In the detailed description of the scheme 3 with reference to fig. 16 and 17, the BSS1 occupies the channels CH2 and CH3, the BBS2 occupies the channel CH4, and the BSS3 occupies the channel CH 1. The physical bandwidth of each channel is 20 MHz. Thus, the BBS2 and BSS3 employ a 20MHz tone plane, and the BBS1 employ either a 20MHz tone plane or a 40MHz tone plane.

If BBS1 uses a tone plane of 40MHz, as shown in FIG. 21. The signal of BSS3 in CH1 is spaced from the signal of BSS1 in CH2 by (12+5) ═ 17 Δ f, and the signal of BSS1 in CH3 is spaced from the signal of BSS2 in CH4 by 11 Δ f, so that the adjacent channel interference between BSS1 and BSS2 and between BSS3 and BSS1 can be overcome.

It should be noted that, for the subcarrier design indication of the sliding 242RU, scheme 3 is the same as scheme 1, and is not described again.

In scheme 3 of the embodiment of the present invention, the sliding 242RU subcarrier design is adopted, including the partial subcarriers in the middle area of the 80MHz bandwidth subcarrier design and the partial subcarriers in the 40MHz bandwidth subcarrier design, by adopting the above design, the influence of adjacent channel interference can be overcome, and the allocation of the 242-RU frequency resources to the users with large data requirements is maintained.

Example 2

Fig. 22 is a schematic block diagram of a frequency resource indication apparatus in a wireless local area network according to embodiment 2 of the present invention. The frequency resource indicating device may be a station STA, an access point AP, or a dedicated circuit or chip for implementing related functions. The station 1000 includes a general purpose processor 1010, memory 1020, signal processor 1030, transceiver 1040, and antenna 1050. The means for transmitting the trigger frame may be AP1-AP2 or STA1-STA4 shown in fig. 4.

In particular, the general purpose processor 1010 controls the operation of the station 1000. The memory 1020 may include read-only memory and random-access memory and provides instructions and data to the general-purpose processor 1010, which may be a central processing unit CPU, digital signal processor DSP, application specific integrated circuit ASIC, field programmable gate array FPGA or other programmable logic device. A portion of the memory 1020 may also include non-volatile row random access memory (NVRAM). Signal processor 1030 is configured to generate baseband signals for transmission or to decode received baseband signals. The transceiver 1040 is used to modulate a low frequency baseband signal to a high frequency carrier signal that is transmitted via the antenna 1050. The radio frequency circuitry is also used to demodulate the high frequency signals received by the antenna 1050 into a low frequency carrier signal. The various components of station 1000 are coupled together by a bus system 1060, where bus system 1060 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are designated as the bus system 1060 in the figure.

A signal processor 1030 configured to generate a physical layer protocol data unit, PPDU, including a signaling field B indicating that a sliding 242 resource unit, RU, is to be employed in one or more 20MHz channels, the sliding 242RU including 242 data subcarriers.

A transceiver 1040 for transmitting the PPDU.

In particular, the signal processor generated slide 242RU includes at least three possible implementations.

Scheme 1: the sliding 242RU includes a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth of the 80MHz bandwidth subcarrier design.

Scheme 2: the sliding 242RU includes a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth subcarrier design.

Scheme 3: the sliding 242RU includes a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 40MHz bandwidth subcarrier design.

Optionally, as an implementation manner, the number of the partial subcarriers in the middle region in the subcarrier design under the 80MHz bandwidth in scheme 1 is x, 7< ═ x < ═ 26, and x is an integer.

Optionally, as another implementation manner, the number of the partial subcarriers in the middle region in the subcarrier design under the 80MHz bandwidth in scheme 1 is x, 7< ═ x < ═ 13, and x is an integer.

It should be noted that the above three schemes have been explained in detail in embodiment 1, and are not described again.

By adopting the design, the influence of adjacent channel interference can be overcome, and the allocation of the 242-RU frequency resources to the users with large data requirements is maintained.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be substantially implemented or a part of the technical solutions contributing to the prior art may be embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a hard disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.

Claims

1. A method for frequency resource indication in a wireless local area network, comprising:

a station generates a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signaling field B, the signaling field B indicates that a sliding 242 Resource Unit (RU) is adopted in one or more 20MHz channels, and the sliding 242RU comprises 242 data subcarriers;

the station sends the PPDU;

the specific relationship of the sliding 242RU subcarrier mapping is to use an RU near a 7dc subcarrier DCtone in an 80MHz bandwidth as a newly added part of the sliding 242RU, and set part of subcarriers in an existing 242RU as guard subcarriers.

2. The method of claim 1, wherein the sliding 242RU comprises: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth of the 80MHz bandwidth subcarrier design.

3. The method of claim 2, wherein the number of the partial subcarriers in the middle region in the subcarrier design at the 80MHz bandwidth is x, 7 ═ x [ -26, and x is an integer.

4. The method of claim 2, wherein the number of the partial subcarriers in the middle region in the subcarrier design at the 80MHz bandwidth is x, 7 ═ x [ -13, and x is an integer.

5. The method of claim 1, wherein the sliding 242RU comprises: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth subcarrier design.

6. The method of claim 1, wherein the sliding 242RU comprises: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 40MHz bandwidth subcarrier design.

7. An apparatus for frequency resource indication in a wireless local area network, comprising:

a signal processor, configured to generate a physical layer protocol data unit (PPDU), where the PPDU includes a signaling field B, where the signaling field B indicates that a sliding 242 Resource Unit (RU) is employed in one or more 20MHz channels, and the sliding 242RU includes 242 data subcarriers;

a transceiver for transmitting the PPDU;

8. The apparatus of claim 7, wherein the slide 242RU comprises: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth of the 80MHz bandwidth subcarrier design.

9. The apparatus of claim 8, wherein the number of partial subcarriers in the middle region in the subcarrier design at the 80MHz bandwidth is x, 7 ═ x [ -26, and x is an integer.

10. The apparatus of claim 8, wherein the number of partial subcarriers in the middle region in the subcarrier design at the 80MHz bandwidth is x, 7 ═ x [ -13, and x is an integer.

11. The apparatus of claim 7, wherein the slide 242RU comprises: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 20MHz bandwidth subcarrier design.

12. The apparatus of claim 7, wherein the slide 242RU comprises: a portion of the subcarriers of the middle region of the 80MHz bandwidth subcarrier design and a portion of the subcarriers of the 40MHz bandwidth subcarrier design.