WO2017076068A1 - Procédé et dispositif d'indication de ressources de fréquence dans un réseau local sans fil - Google Patents

Procédé et dispositif d'indication de ressources de fréquence dans un réseau local sans fil Download PDF

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Publication number
WO2017076068A1
WO2017076068A1 PCT/CN2016/090851 CN2016090851W WO2017076068A1 WO 2017076068 A1 WO2017076068 A1 WO 2017076068A1 CN 2016090851 W CN2016090851 W CN 2016090851W WO 2017076068 A1 WO2017076068 A1 WO 2017076068A1
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subcarrier
subcarriers
design
sliding
mhz bandwidth
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PCT/CN2016/090851
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English (en)
Chinese (zh)
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刘乐
李云波
李彦淳
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华为技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to the field of communications technologies, and more particularly to a method and apparatus for frequency resource indication in a wireless local area network.
  • WLAN Wireless Local Area Network
  • 802.11n/ac Wired Local Area Network
  • the next-generation WLAN standard 802.11ax may adopt the following technical features: 4X symbols and multiple discontinuous 20MHz channel bonding. Among them, one 4X symbol accommodates 256 subcarriers, and TGax has disclosed the subcarrier design of 4X symbols under different bandwidths (including the positions of data subcarriers, pilot subcarriers, and remaining subcarriers), and the existing WLAN standard adopts 1X symbol, 1X symbol accommodates 64 subcarriers. It should be noted that the above symbols refer to OFDM (Orthogonal Frequency Division Multiplexing) symbols.
  • the existing 802.11ac standard supports four bandwidth modes, specifically 20MHz, 40MHz, 80MHz and 160 (80+80)MHz, except for the 80+80 bandwidth mode, which is two-segment discontinuous channel bonding, and the remaining bandwidth.
  • the modes are all continuous 20MHz channel bonding.
  • 802.11ax supports multiple discontinuous 20MHz channel-bound bandwidth modes for user access flexibility.
  • the 4X symbol subcarrier design is applied to a band of discontinuous 20 MHz channel bonding.
  • the wide mode scenario illustrates that the 80 MHz bandwidth includes channels 1-4, with channels 1-4 having a bandwidth of 20 MHz.
  • Channels 1, 3 and 4 are used by BSS1 (English: Basic Services Set, abbreviated as: basic service set), and channel 2 is used by BSS2. Because 4X symbols lack sufficient subcarrier spacing between different 20MHz channels, BSS1 and BBS2 will generate adjacent channel interference (English: Ajacent Channel Interference, ACI for short).
  • the main object of the present invention is to provide a method and apparatus for frequency resource indication in a wireless local area network, adopting a new subcarrier design for 4X symbols, so that the 4X symbol subcarrier design is applied to discontinuous 20 MHz channel bonding.
  • the bandwidth mode scenario can overcome adjacent channel interference between different BSSs.
  • an embodiment of the present invention provides a method for indicating a frequency resource in a wireless local area network, including:
  • the station generates a Physical Layer Protocol Data Unit PPDU, the PPDU including a Signaling Field B indicating that the sliding 242 Resource Unit RU is employed in one or more 20 MHz channels, the sliding 242RU comprising 242 data subcarriers .
  • the station sends the PPDU.
  • the first aspect contains three possible implementations.
  • the sliding 242RU includes: a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 20 MHz bandwidth designed by an 80 MHz bandwidth subcarrier.
  • the sliding 242RU includes: a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 20 MHz bandwidth subcarrier design.
  • the sliding 242RU includes: an intermediate area of an 80MHz bandwidth subcarrier design Partial subcarriers of the domain and partial subcarriers of the 40MHz bandwidth subcarrier design.
  • an embodiment of the present invention provides a device for indicating a frequency resource in a wireless local area network, including:
  • a signal processor for generating a physical layer protocol data unit PPDU, the PPDU including a signaling field B indicating that a sliding 242 resource unit RU is employed in one or more 20 MHz channels, the sliding 242RU including 242 data subcarriers.
  • a transceiver configured to send the PPDU.
  • the second aspect contains three possible implementations.
  • the sliding 242RU includes: a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 20 MHz bandwidth designed by an 80 MHz bandwidth subcarrier.
  • the sliding 242RU includes: a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 20 MHz bandwidth subcarrier design.
  • the sliding 242RU includes: a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 40 MHz bandwidth subcarrier design.
  • the present invention redesigns the mapping relationship of the subcarriers, and uses the subcarrier mapping of the sliding 242RU to use the (13+13)RU near the 7DC tone in the 80MHz bandwidth as a new part of the sliding 242RU, and the existing 242RU.
  • Part of the subcarriers are set to protect the subcarriers (without carrying data).
  • adjacent channel interference is overcome such that the number of data subcarriers in the sliding 242RU and the existing 242RU remains unchanged, and by setting a wider protection subcarrier.
  • Figure 1 is a diagram of a current 20MHz bandwidth subcarrier design tone plan.
  • Figure 2 is a diagram of a current 40MHz bandwidth subcarrier design tone plan.
  • FIG. 3 is a diagram showing a tone plan of a subcarrier design of an existing 80 MHz bandwidth.
  • FIG. 4 is an application scenario diagram of the present invention.
  • FIG. 5 is a structural diagram of a possible physical layer data unit of the application of the present invention.
  • FIG. 6 is a flowchart of a method according to Embodiment 1 of the present invention.
  • FIG. 7 is a first bandwidth mode of Embodiment 1 of the present invention.
  • FIG. 8 is a diagram showing an AR distribution in a first bandwidth mode according to Embodiment 1 of the present invention.
  • FIG. 9 is a flowchart 1 of the RU distribution in the first bandwidth mode according to Embodiment 1 of the present invention.
  • FIG. 10 is a second diagram of RU distribution in the first bandwidth mode according to Embodiment 1 of the present invention.
  • FIG. 11 is a diagram 3 of a RU distribution in a first bandwidth mode according to Embodiment 1 of the present invention.
  • FIG. 12 is a second bandwidth mode of Embodiment 1 of the present invention.
  • FIG. 13 is a diagram showing a RU distribution in a second bandwidth mode according to Embodiment 1 of the present invention.
  • Figure 14 is a third bandwidth mode of Embodiment 1 of the present invention.
  • FIG. 15 is a diagram showing the RU distribution in the third bandwidth mode according to Embodiment 1 of the present invention.
  • Figure 16 is a fourth bandwidth mode of Embodiment 1 of the present invention.
  • FIG. 17 is a diagram showing a RU distribution in a fourth bandwidth mode according to Embodiment 1 of the present invention.
  • Figure 18 is a diagram showing an RU distribution case 1 (80 MHz tone plan) according to the second embodiment of the present invention.
  • 19 is a RU distribution scenario 2 (20 MHz tone plan) according to the second embodiment of the present invention.
  • 20 is a RU distribution scenario 1 (20 MHz tone plan) according to the third embodiment of the present invention.
  • Figure 21 is a diagram showing a RU distribution scenario 2 (40 MHz tone plan) according to the third embodiment of the present invention.
  • Figure 22 is a structural diagram of a physical device in Embodiment 2 of the present invention.
  • the IEEE has disclosed a tone plan (subcarrier allocation pattern) for an 802.11ax system, which supports OFDMA transmission, wherein a tone plan of 20/40/80 MHz bandwidth is shown in FIGS.
  • the tone plan defines a location of a different size frequency resource unit (English: Resource Unit, referred to as RU), which is composed of an protection sub-band, a data tone, and a DC tone.
  • RU Resource Unit
  • the position of the pilot sub-lot and the remaining interval leftover tone.
  • 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, 484-tone RU and 996-tone RU can be allocated by OFDMA transmission.
  • FIG. 1 is a tone plan in a 20 MHz bandwidth
  • the 20 MHz bandwidth includes 256 subcarriers
  • the subcarriers have a sequence number of (-128, -127...0, 1, . . . 127). If the subcarriers in the 20 MHz bandwidth are in RU-26 as the minimum unit, the pilot subcarriers are located at ⁇ 10, ⁇ 22, ⁇ 36, ⁇ 48, ⁇ 62, ⁇ 76, ⁇ 90, ⁇ 102, ⁇ 116.
  • the pilot subcarriers are located at ⁇ 10, ⁇ 22, ⁇ 36, ⁇ 48, ⁇ 62, ⁇ 76, ⁇ 90, ⁇ 102, ⁇ 116. If the subcarriers in the 20 MHz bandwidth are in the smallest unit of RU-106 and RU-242, the pilot subcarriers are located at ⁇ 22, ⁇ 48, ⁇ 90, ⁇ 116.
  • FIG. 2 is a tone plan in a 40 MHz bandwidth
  • the 40 MHz bandwidth includes 512 subcarrier positions
  • the subcarriers have a sequence number of (-256, . . . 0, 1, . . . 255).
  • the pilot subcarriers are located at ⁇ 10, ⁇ 24, ⁇ 36, ⁇ 50, ⁇ 64, ⁇ 78, ⁇ 90, ⁇ 104. , ⁇ 116, ⁇ 130, ⁇ 144, ⁇ 158, ⁇ 170, ⁇ 184, ⁇ 198, ⁇ 212, ⁇ 224, ⁇ 238.
  • the pilot subcarriers are located at ⁇ 10, ⁇ 36, ⁇ 78, ⁇ 104, ⁇ 144, ⁇ 170, ⁇ 212, ⁇ 238.
  • Figure 3 shows the tone plan at 80MHz bandwidth, and the 80MHz bandwidth includes 1024 Subcarrier position, the sequence number of the subcarrier is (-512, ... 0, 1, ... 511). If the subcarriers in the 80MHz bandwidth are in RU-26 and RU-52 as the minimum unit, the pilot subcarriers are located at ⁇ 10, ⁇ 24, ⁇ 38, ⁇ 50, ⁇ 64, ⁇ 78, ⁇ 92, ⁇ 104.
  • the pilot subcarriers are located at ⁇ 24, ⁇ 50, ⁇ 92, ⁇ 118, ⁇ 158, ⁇ 184, ⁇ 226, ⁇ 252, ⁇ 266, ⁇ 292, ⁇ 334, ⁇ 360, ⁇ 400, ⁇ 426, ⁇ 468, ⁇ 494. If the subcarriers in the 80 MHz bandwidth are in the smallest unit of RU-996, the pilot subcarriers are located at ⁇ 24, ⁇ 92, ⁇ 158, ⁇ 226, ⁇ 266, ⁇ 334, ⁇ 400, ⁇ 468.
  • tone plans with bandwidths above 80MHz For tone plans with bandwidths above 80MHz, a combination of tone plans with 80MHz bandwidth is used. For example: a tone plan with a bandwidth of 160MHz, using a two-band tone plan with 80MHz bandwidth.
  • each represents a resource unit containing 26 data subcarriers.
  • the embodiment of the present invention can be applied to a wireless local area network (English: Wireless Local Area Network, WLAN for short).
  • the standard adopted by the WLAN is IEEE (English: Institute of Electrical and Electronics Engineers) 802.11 series.
  • the WLAN may include multiple basic service sets (English: Basic Service Set, BSS for short).
  • the network nodes in the basic service set are stations (English: Station, abbreviated as STA).
  • the site includes the access point class (abbreviation: AP). , English: Access Point) and non-access point class sites (English: None Access Point Station, referred to as: Non-AP STA).
  • Each basic service set may contain one AP and multiple Non-AP STAs associated with the AP.
  • Access point class sites also known as wireless access points or hotspots.
  • the AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the AP can be equipped with WiFi (English: Wireless) Fidelity, Chinese: Wireless fidelity) chip terminal device or network device.
  • the AP may be a device supporting the 802.11ax system. Further, the AP may be a device supporting multiple WLAN technologies such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • Non-AP STA A non-access point class (English: None Access Point Station, referred to as Non-AP STA), which can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • Non-AP STA mobile phone supporting WiFi communication function
  • tablet computer supporting WiFi communication function set-top box supporting WiFi communication function
  • smart TV supporting WiFi communication function smart wearable device supporting WiFi communication function
  • vehicle communication supporting WiFi communication function Devices and computers that support WiFi communication.
  • the site can support the 802.11ax system. Further optionally, the site supports multiple WLAN formats such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • FIG. 4 is a system diagram of a WLAN deployment scenario of the present invention, including two APs and four STAs, and AP1 communicates with STA1 and STA2 respectively, and is defined as BSS1 (English: Basic Services Set, Chinese: basic service set), and AP2 respectively STA3 communicates with STA4, which is defined as BSS2.
  • BSS1 Basic Services Set
  • AP2 respectively STA3 communicates with STA4, which is defined as BSS2.
  • the AP can perform uplink and downlink transmission with different STAs on different time-frequency resources.
  • the AP can adopt different modes for uplink and downlink transmission, such as OFDMA single-user multiple-input multiple-output (SU-MIMO) mode, or OFDMA multi-user multiple input multiple output (Multi-User Multiple).
  • SU-MIMO OFDMA single-user multiple-input multiple-output
  • Multi-User Multiple OFDMA multi-user multiple input multiple output
  • MU-MIMO -Input Multiple-Output
  • the AP may simultaneously send a Physical Layer Protocol Data Unit (PPDU) to multiple sites or multiple site groups.
  • PPDU Physical Layer Protocol Data Unit
  • multiple sites may refer to sites in SU-MIMO mode
  • multiple site groups may refer to site groups in MU-MIMO mode.
  • the PPDU sent by the AP is as shown in FIG. 5.
  • the PPDU includes a Physical Layer Convergence Procedure (PLCP) header field and a data field
  • the PLCP Header includes a traditional preamble (L-).
  • Preamble) and control domain traditional preamble includes L-STF (English: Legacy Short Training Field, Chinese: Traditional Short Training Field), L-LTF (English: Legacy Long Training Field, Chinese: Traditional Long Training Field), L-SIG (English: Legacy Signaling Field, Chinese: Traditional Signaling Field) and RL-SIG (English: Repeated Legacy Signaling Field, Chinese: Repeating Traditional Signaling Field).
  • This control field contains High Efficient Signaling A (referred to as High Efficient Signaling A).
  • HE-SIGA Partial and High Efficient Signaling B
  • Other HE Preamble refers to a field or a combination of multiple fields, and is not limited to a specific field.
  • the Other Hew Preamble field is followed by a data field (Data).
  • the HE-SIGB contains a public part and a dedicated part.
  • Embodiment 1 of the present invention provides a channel indication method applied to a WLAN, and the method can be applied to a site, for example, AP1-AP2 and STA1-STA4 in FIG. 4, and the site can support a next-generation WLAN standard, for example: 802.11ax standard.
  • Figure 6 is an exemplary block diagram of the data transmission method, the specific steps are as follows:
  • Step 101 The station generates a physical layer protocol data unit PPDU, where the PPDU includes a signaling field B indicating that the sliding 242 resource unit RU is used in one or more 20 MHz channels, and the sliding 242RU includes 242 Data subcarrier.
  • Step 102 The station sends the PPDU.
  • the subcarrier design of the sliding 242RU includes three schemes.
  • the specific relationship of the subcarrier mapping of the sliding 242RU is that a (13+13)RU near the 7DC tone in the 80MHz bandwidth is used as a new part of the sliding 242RU, and some subcarriers in the existing 242RU are set to Protect subcarriers (do not carry data).
  • a wider protection subcarrier in the above manner, the adjacent channel interference is overcome, so that the number of data subcarriers in the sliding 242RU and the existing 242RU remains unchanged.
  • the sliding 242RU in scheme 1 adopts a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 20 MHz bandwidth designed by an 80 MHz bandwidth subcarrier.
  • the sliding 242RU in scheme 2 adopts a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 20 MHz bandwidth subcarrier design.
  • the sliding 242RU in scheme 3 adopts a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 40 MHz bandwidth subcarrier design.
  • BSS1 occupies channel CH2-CH4, and BBS2 occupies channel CH1.
  • the physical bandwidth of each channel is 20MHz. Therefore, BBS2 uses a 20MHz tone plan, and BBS1 uses an 80MHz tone plan.
  • the specific scheme of the subcarrier design of the sliding 242RU adopted by the present invention is as follows: without changing the tone plan of 80 MHz, the x subcarriers close to CH1 are removed from the 242-RU on CH2, and the remaining (242-x) sub-subs The carrier and the x subcarriers near the CH2 in the intermediate (13+13)-tone RU of 80 MHz are combined into a new 242-tone RU. There are 234 data subcarriers and 8 pilot subcarriers, which are consistent with the traditional 242-tone RU.
  • the pilot positions in the 242-RU on the conventional CH2 are ⁇ -252, -226, -184, -158, -118, -92, -50, -24 ⁇ and the middle (13+13)-tone RU Remove 8 ⁇ -226, -184, -158, -118, -92, -50, -24, -10 ⁇ from the frequency position ⁇ -10, +10 ⁇ as the newly defined 242-tone RU on CH2 Pilots.
  • x 26, that is, (242-26)-tone and intermediate (13+13)-tone are combined into a new 242-RU.
  • the 242-RU of the 20MHz 802.11ax user on CH1 and the newly defined 242-RU on CH2 in 80MHz increase the interval to 29 subcarriers, avoiding the influence of ACI.
  • the pilot position in the newly defined 242-tone RU on CH2 can be ⁇ -226, -184, -158, -118, -92, -50, -24, -10 ⁇ , and sent at the +10 position.
  • Data, enough 234 data tones; or the pilot position in the newly defined 242-tone RU can be ⁇ -226, -184, -158, -118, -92, -50, -24, +10 ⁇ , And send data at the -10 position, enough 234 data tone.
  • the 242-RU of the 20MHz 802.11ax user on CH1 and the newly defined 242-RU on CH2 in 80MHz increase the interval to 16 subcarriers, avoiding the influence of ACI and ensuring that the newly defined 242-RU does not need to cross the intermediate DC. .
  • 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 242-RU of the 20MHz 802.11ax user on CH1 and the newly defined 242-RU on CH2 in 80MHz increase the interval to 11 subcarriers (11 subcarriers are the minimum interval of 242-RU on the two 20MHz of 802.11ax), avoiding At the same time as the impact of ACI, it is guaranteed that the newly defined 242-RU does not need to cross the intermediate DC, while increasing the protection subcarrier spacing between CH2 and DC.
  • BSS1 occupies channels CH1-CH3 and BBS2 occupies channel CH4.
  • the physical bandwidth of each channel is 20MHz. Therefore, BBS2 uses a 20MHz tone plan, and BBS1 uses an 80MHz tone plan.
  • the specific scheme of the subcarrier design of the sliding 242RU adopted by the present invention is as follows: without changing the 80 MHz tone plan, the x subcarriers close to CH4 are removed from the 242-RU on CH3, and the remaining (242-x) subcarriers are used. The x subcarriers close to CH3 in the middle (13+13)-tone RU of 80 MHz are combined into a new 242-tone RU. There are 234 data subcarriers and 8 pilot subcarriers, which are consistent with the traditional 242-tone RU.
  • the pilot positions in the 242-RU on the traditional CH3 are ⁇ +24, +50, +92, +118, +158, +184, +226, +252 ⁇ and the middle (13+13)-tone RU Remove 8 from the frequency position ⁇ -10, +10 ⁇ ⁇ +10, +24, +50, +92, +118, +158, +184, +226 ⁇ as the pilot in the newly defined 242-tone RU on CH3.
  • BSS1 occupies channels CH1 and CH3
  • BBS2 occupies channel CH4
  • BSS3 occupies channel 2.
  • the physical bandwidth of each channel is 20MHz. Therefore, BBS2 and BSS3 adopt a 20MHz tone plan, and BBS1 adopts an 80MHz tone plan, occupying CH1 and CH3, wherein CH1 includes 12 edge tones and 242RU on the left side.
  • BSS3 occupies CH2 and adopts a 20MHz tone plan, including 6 edge tone and 242RU on the left (the RU contains 3 DC tones, so the total number of subcarriers is 245) and 5 edge tones on the right, so the signal of BSS3 in CH2
  • the signal of BSS3 in CH2 is not affected by ACI.
  • the specific scheme of the subcarrier design of the sliding 242RU adopted by the present invention is as follows: without changing the 80 MHz tone plan, the x subcarriers close to CH4 are removed from the 242-RU on CH3, and the remaining (242-x) subcarriers are used. The x subcarriers close to CH3 in the middle (13+13)-tone RU of 80 MHz are combined into a new 242-tone RU. There are 234 data subcarriers and 8 pilot subcarriers, which are consistent with the traditional 242-tone RU.
  • pilot positions in the 242-RU on the traditional CH3 are ⁇ +24, +50, +92, +118, +158, +184, +226, +252 ⁇ and the middle (13+13)-tone RU 8 ⁇ +10, +24, +50, +92, +118, +158, +184, +226 ⁇ are taken from the frequency position ⁇ -10, +10 ⁇ as the newly defined 242-tone RU on CH3. Pilot.
  • BSS1 occupies channels CH2 and CH3, BBS2 occupies channel CH4, and BSS3 occupies CH1.
  • the physical bandwidth of each channel is 20MHz. Therefore, BBS2 and BSS3 adopt a 20MHz tone plan, and BBS1 adopts an 80MHz tone plan, occupying CH2 and CH3, where CH1 includes 6 left edge tones and 242RU (the RU contains 3 DC tones, so the total number of subcarriers is 245) )).
  • BSS2 occupies CH4 and uses a 20MHz tone plan, including 242RU (the RU contains 3 DC tones, so the total number of subcarriers is 245) and 5 edge tones on the right, so the signal of BSS1 in CH2 and the signal of BSS3 in CH1
  • the design will result in adjacent channel interference between BSS1 and BSS2, BSS1 and BSS3.
  • the x subcarriers are combined into a new 242-tone RU.
  • the x values on both sides are the same and can maintain a certain symmetry.
  • subcarrier design for the sliding 242RU is indicated by the signaling field B, and can be applied to the flow of the downlink multi-user transmission and the flow of the uplink multi-user transmission, which are respectively explained below.
  • the downlink multi-user transmission process is sent by the AP to multiple STAs at the same time.
  • the signaling field B of the PPDU transmitted by the downlink multi-user indicates the sub-carrier design of the sliding 242RU, and the indication manner includes two types.
  • the SIGB indication method is adopted.
  • the SIGB includes two parts: SIB common (user public information) and dedicated (user-specific information), and the SIGB common part is packaged.
  • Resource allocation information including CH 1/2/3/4, indicating the assigned RU combination mode and SU/MU-MIMO allocated on 26/52/106/242/484/996-tone RU for each CH User number.
  • the SIGB dedicated part contains scheduling information of each user of the corresponding channel, such as a user identification number (STA ID), a modulation code (MCS), an encoding type (LDPC/BCC), a spatial stream number, and a stream number number.
  • STA ID user identification number
  • MCS modulation code
  • LDPC/BCC encoding type
  • the channel bonding mode of CH2+CH3+CH4 of case 1 of scheme 1 does not need to cause the traditional 242-RU of ACI on CH2, but adopts the subcarrier design of the new sliding 242-RU.
  • SIGB common assigns a 242-RU and an intermediate (13+13)-RU allocation of an 80 MHz tone plan to the CH2 indication.
  • HE-SIG-B common it is necessary to indicate whether to assign to a user according to the specified RU position and size, such as the size and position specified in 26/52/106/242/484/996/2*996, indicating whether to allocate A user gives 242-RU on CH2, and another user is assigned to the middle (13+13)-RU.
  • the 242-RU and the intermediate (13+13)-RU on the indication CH2 are all assigned to the same user, it indicates that the subcarrier design assigned to the user's predetermined new sliding 242-RU is assigned.
  • the 242-RU of CH2 and the middle (13+13)-RU of 80 MHz repeatedly indicate the information of the allocated user, that is, the 242-RU and the intermediate (13+13)-RU of CH2 simultaneously indicate the allocation.
  • the sub-carrier design to which the new sliding 242-RU is assigned is indicated to the same user.
  • Indication mode 2 If the bandwidth indication field of the SIGA contains a channel bonding mode indication, the 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 of scheme 1 does not cause the traditional 242-RU allocation of ACI on CH2, but adopts the subcarrier design of the new sliding 242-RU.
  • the channel bonding mode selection in the SIGA indicates the combination of CH2+CH3+CH4, and the SIGB common indicates that the CH2 allocates 242-RU, it implicitly indicates that the CH2 combining intermediate (13+13)-RU becomes a new sliding. 242-RU subcarrier design.
  • the 242-RU at CH2 in the SIGB dedicated indicates that the user's information is assigned, and there is no need to repeat the indication in the dedicated portion corresponding to the (13+13)-RU.
  • multiple STAs simultaneously transmit uplink multi-user transmission data packets under the scheduling of the AP trigger frame, and indicate the sub-carrier design of the sliding 242RU in the trigger frame of the AP, and the indication method includes two types.
  • the Trigger frame contains the proprietary scheduling information of each user on each CH, such as the user identification number (STA ID), the starting position of the scheduling resource block, the SU/MU-MIMO transmission mode, and the modulation coding (MCS). ), coding type (LDPC/BCC), spatial stream number and stream number number.
  • STA ID user identification number
  • MCS modulation coding
  • LDPC/BCC coding type
  • spatial stream number spatial stream number and stream number number number.
  • the channel bonding mode of CH2+CH3+CH4 of case 1 of scenario 1 does not cause the traditional 242-RU allocation of ACI on CH2, but adopts the subcarrier design of the new sliding 242-RU, then the indication on 242-RU on CH2 User information is assigned and the assigned user information is repeatedly indicated on the middle (13+13)-RU.
  • Indication mode 2 The bandwidth indication field in the Trigger frame, which includes the channel bonding mode indication. If the channel binding indicates the CH2+CH3+CH4 channel combination, and the 242-RU is allocated on the CH2, the CH2 combination is implicitly indicated. The middle (13+13)-RU becomes the new 242-RU. The user-specific indication information corresponding to the 242-RU on CH2 indicates that the user information is assigned, and there is no need to repeatedly indicate the assigned user information on the middle (13+13)-RU.
  • the receiving end is preset according to the standard.
  • a subcarrier design of a sliding 242RU including a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 20 MHz bandwidth designed by an 80 MHz bandwidth subcarrier, by adopting the above design, Overcoming the effects of adjacent channel interference, and maintaining 242-RU frequency resources allocated to users with large data demands.
  • BSS1 occupies channel CH2-CH4, and BBS2 occupies channel CH1, and the physical bandwidth of each channel is 20 MHz. Therefore, BBS2 uses a 20MHz tone plan, and B2 in BBS1 uses a 20MHz tone plan.
  • BSS2 occupies CH1, including 6 edge tones and 242RU on the left (the RU contains 3 DC tones, so the total number of subcarriers is 245) and 5 edge tones on the right.
  • CH3 and CH4 in BSS1 can be 80 MHz.
  • the tone plan design is shown in Figure 18.
  • CH3 and CH4 in BSS1 can also be designed with a 20MHz tone plan, as shown in Figure 19.
  • the scenario 2 scenario 2 is described in detail in conjunction with FIG. 12 and FIG. 13, where BSS1 occupies channels CH1-CH3 and BBS2 occupies channel CH4.
  • the physical bandwidth of each channel is 20MHz. Therefore, BBS2 uses a 20MHz tone plan, and CH1-CH3 in BBS1 uses a 20MHz tone plan with no (13+13)-tone RU in between.
  • BSS1 occupies channels CH1 and CH3
  • BBS2 occupies channel CH4
  • BSS3 occupies channel 2.
  • the physical bandwidth of each channel is 20MHz. Therefore, BBS2 and BSS3 use a 20MHz tone plan, and BBS1 uses a 20MHz tone plan, occupying CH1 and CH3.
  • adjacent channel interference between BSS1 and BSS2 and adjacent channel interference between BSS3 and BSS1 will be overcome.
  • BSS1 occupies channels CH2 and CH3
  • BBS2 occupies channel CH4
  • BSS3 occupies CH1.
  • the physical bandwidth of each channel is 20MHz. Therefore, BBS2 and BSS3 use a 20MHz tone plan, and BBS1 uses a 20MHz tone plan or a 40MHz tone plan.
  • the subcarrier design of the sliding 242RU is adopted, and part of the subcarriers in the middle region of the 80MHz bandwidth subcarrier design and partial subcarriers in the 20MHz bandwidth subcarrier design are adopted, and the adjacent design can overcome the adjacent design.
  • BSS1 occupies channels CH2 and CH3
  • BBS2 occupies channel CH4
  • BSS3 occupies CH1.
  • the physical bandwidth of each channel is 20MHz. Therefore, BBS2 and BSS3 use a 20MHz tone plan, and BBS1 uses a 20MHz tone plan or a 40MHz tone plan.
  • the subcarrier design of the sliding 242RU is adopted, and part of the subcarriers in the middle region of the 80MHz bandwidth subcarrier design and partial subcarriers in the 40MHz bandwidth subcarrier design are adopted, and the adjacent design can overcome the adjacent design.
  • FIG. 22 is a schematic block diagram of a frequency resource indicating 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 that implements related functions.
  • the site 1000 includes a general purpose processor 1010, a memory 1020, a signal processor 1030, a transceiver 1040, and an antenna 1050.
  • the means for transmitting the trigger frame may be AP1-AP2 or STA1-STA4 shown in FIG.
  • the general purpose processor 1010 controls the operation of the site 1000.
  • the memory 1020 can include read only memory and random access memory, and provides instructions and data to the general purpose processor 1010, which can be a central processing unit CPU, a digital signal processor DSP, an application specific integrated circuit ASIC, a field programmable gate array. FPGA or other programmable logic device. A portion of memory 1020 may also include non-volatile line random access memory (NVRAM).
  • Signal processor 1030 is operative to generate a baseband signal to be transmitted or to decode the received baseband signal.
  • the transceiver 1040 is configured to modulate a low frequency baseband signal to a high frequency carrier signal, and a high frequency carrier signal is transmitted through the antenna 1050.
  • the radio frequency circuit is also used to demodulate the high frequency signal received by the antenna 1050 into a low frequency carrier signal.
  • the various components of the site 1000 are coupled together by a bus system 1060 that includes, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 1060 in the figure.
  • the signal processor 1030 is configured to generate a physical layer protocol data unit PPDU, where the PPDU includes a signaling field B indicating that the sliding 242 resource unit RU is adopted in one or more 20 MHz channels, the sliding 242RU Contains 242 data subcarriers.
  • the transceiver 1040 is configured to send the PPDU.
  • the sliding 242RU generated by the signal processor includes at least three possible implementations.
  • the sliding 242RU includes a partial subcarrier of an intermediate region of an 80 MHz bandwidth subcarrier design and a partial subcarrier of a 20 MHz bandwidth designed by an 80 MHz bandwidth subcarrier.
  • the sliding 242RU includes a partial subcarrier of the intermediate region of the 80 MHz bandwidth subcarrier design and a partial subcarrier of the 20 MHz bandwidth subcarrier design.
  • the sliding 242RU includes a partial subcarrier of the intermediate region of the 80 MHz bandwidth subcarrier design and a partial subcarrier of the 40 MHz bandwidth subcarrier design.
  • the signal processor of the frequency resource indicating apparatus in the embodiment of the present invention generates a packet PPDU, and the PPDU is used to indicate the subcarrier design of the sliding 242RU.
  • the PPDU is used to indicate the subcarrier design of the sliding 242RU.
  • the invention can be implemented by means of software plus a necessary general hardware platform, and of course hardware, but in many cases the former is a better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, can be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • a hard disk or optical disk, etc. includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

Abstract

La présente invention concerne un procédé d'indication de ressources de fréquence dans un réseau local sans fil, le procédé consistant à : générer, au moyen d'une station, une unité de données de protocole de couche physique (PPDU pour Physical Layer Protocol Data Unit) comprenant un champ B de signalisation indiquant qu'une unité de 242 ressources mobiles (RU pour Resource Unit) est utilisée dans un ou plusieurs canaux de 20 MHz, l'unité de 242 ressources mobiles comprenant 242 sous-porteuses de données. La présente invention concerne également un dispositif d'indication de ressources de fréquence et peut surmonter, au moyen du procédé mentionné ci-dessus, une influence d'interférence de canal adjacent et garantir que des ressources de fréquence de l'unité de 242 ressources mobiles sont attribuées à des utilisateurs ayant une demande de données importante.
PCT/CN2016/090851 2015-11-03 2016-07-21 Procédé et dispositif d'indication de ressources de fréquence dans un réseau local sans fil WO2017076068A1 (fr)

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