A method and device for implementing frequency domain multiplexing in a wireless communication system

Abstract

The present invention discloses a method and device for realizing frequency domain multiplexing in a wireless communication system, wherein the frequency domain resources are divided into a plurality of resource units, each resource unit includes a plurality of subcarriers, and each STA is allocated with at least one resource unit; according to the number of resource units occupied by the STA, the resource allocation of the uplink and downlink transmission channels is indicated in the control channel, and the basic parameters of the system are set according to different subcarrier intervals and bandwidths, and the basic unit of the frequency domain is changed from a subchannel to a subcarrier-level resource unit, so that the granularity of the frequency domain multiplexing is finer, and the frequency domain high multiplexing is realized, and more users are supported at the same time.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a method and device for implementing frequency domain multiplexing in a wireless communication system. Background Art

[0002] ITU has identified three major application scenarios for 5G, namely eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communication) and URLLC (Ultra-Reliable and Low Latency Communications).

[0003] Massive machine-type communications (mMTC) is one of the three major application scenarios of 5G networks. In the network access scenario for massive devices, mMTC focuses on solving the problem that traditional mobile communications cannot well support the Internet of Things and vertical industry applications. At the same time, the terminals in low-power and large-connection scenarios are widely distributed and numerous, which not only requires the network to have connection support capabilities, but also to ensure low power consumption and low cost of the terminals. Therefore, wireless communication technology for mMTC has important research significance.

[0004] The prior art only supports time domain multiplexing and spatial domain multiplexing of multiple users, and the frequency domain sub-channels are allocated to the same user. Frequency domain multiplexing of multiple users is not supported, which makes it difficult to meet the large connection requirements of massive machine-type communications. In order to meet the requirements of low-power large connections in the mMTC scenario, the present invention proposes a method and device for realizing frequency domain multiplexing in a wireless communication system. Summary of the invention

[0005] In view of this, the present invention provides a method and device for realizing frequency domain multiplexing in a wireless communication system, which can meet the requirements of low power consumption and large connection in the mMTC scenario, and is suitable for smart meter reading, smart agriculture, logistics, tracking, fleet management and other fields that require low cost, low energy consumption, small data volume and a large number of connections. By changing the basic unit of the frequency domain from a subchannel to a subcarrier-level resource unit RU, each resource unit includes multiple frequency domain data subcarriers, so that the granularity of frequency domain multiplexing becomes finer, and high frequency domain multiplexing is realized, which can support a large number of users at the same time.

[0006] In a first aspect, a method for implementing frequency domain multiplexing is provided, comprising:

[0007] Allocate frequency domain resources: divide the frequency domain resources into multiple resource units, and each STA is allocated at least one resource unit, where the resource unit includes multiple frequency domain data subcarriers;

[0008] Dividing the frequency domain data subcarriers into a plurality of resource units according to the number of frequency domain data subcarriers and the subcarrier spacing; the resource unit is a basic unit for resource allocation;

[0009] One resource unit includes 16 frequency-domain data subcarriers; the resource units are continuous and non-overlapping.

[0010] According to the number of resource units occupied by STA, the resource allocation of uplink and downlink transmission channels is indicated in the control channel, and the basic system parameters are set according to different subcarrier spacing and bandwidth;

[0011] The basic system parameters include: number of data subcarriers, number of phase tracking pilot subcarriers, phase tracking pilot index, number of virtual subcarriers, and virtual subcarrier index;

[0012] According to different bandwidth indexes, a phase tracking pilot index set under corresponding bandwidth is generated;

[0013] According to different bandwidth indexes, a virtual subcarrier index set under the corresponding bandwidth is generated.

[0014] CAP allocates and indicates resources through bit definitions in the control channel, including indicating the valid basic resource unit RU location, the starting OFDM symbol index of the STA resource group, the number of consecutive symbols occupied by the resource group, and the resources used for signaling and feedback transmission;

[0015] A channel quality feedback frame is configured, wherein the CQI information part of the channel quality feedback frame body includes subchannel mapping, MCS1 and MCS2, coding type and SINR information; the SINR information includes the signal to interference and noise ratio SINR of different resource units allocated to different spatial streams.

[0016] Set the downlink channel cell reference signal and uplink channel demodulation reference signal according to the system working mode;

[0017] The different modes include: a normal mode and a low error mode.

[0018] In a second aspect, a central access point for implementing frequency domain multiplexing is provided, including:

[0019] A division module is used to allocate frequency domain resources and divide the frequency domain data subcarriers into multiple resource units according to the number of frequency domain data subcarriers and the subcarrier spacing;

[0020] An allocation module, configured to allocate the plurality of resource units to one or more stations STA;

[0021] A processing module, used to indicate resource allocation of uplink and downlink transmission channels and set basic system parameters in a control channel according to the number of resource units occupied by STAs;

[0022] The one resource unit includes 16 frequency-domain data subcarriers; the resource units are continuous and non-overlapping.

[0023] Beneficial effects achieved by the present invention:

[0024] 1. Changing the basic unit of the frequency domain from a subchannel to a subcarrier-level resource unit RU makes the granularity of frequency domain multiplexing finer, achieves high frequency domain multiplexing, supports more users at the same time, and meets the large connection requirements of massive machine-type communications;

[0025] 2. The basic system parameters are designed for different subcarrier spacing and different bandwidths. Each resource unit RU includes a corresponding phase tracking pilot, which improves the performance and applicability of the system and ensures low cost and low energy consumption while supporting massive user connections.

[0026] For the above and related purposes, one or more embodiments include features that will be described in detail below and particularly pointed out in the claims. The following description and the accompanying drawings describe certain exemplary aspects in detail, and are indicative of only some of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent as the following detailed description is considered in conjunction with the accompanying drawings, and the disclosed embodiments are intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of a method for implementing frequency domain multiplexing in a wireless communication system provided in Embodiment 1;

[0028] Figure 2 This is a schematic diagram of OFDM resource unit mapping under 20M bandwidth provided in Example 1;

[0029] Figure 3 This is a diagram showing the structure of a channel quality feedback frame provided in Embodiment 1;

[0030] Figure 4 This is a frame structure diagram in the low error mode provided in Embodiment 2;

[0031] Figure 5 This is a block diagram of a central access point for implementing frequency domain multiplexing provided in Embodiment 3;

[0032] Figure 5a This is a block diagram of the processing module provided in Example 3. DETAILED DESCRIPTION

[0033] The following description and the accompanying drawings fully illustrate specific embodiments of the present invention so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The examples represent possible changes only. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of the present invention includes the entire scope of the claims, and all available equivalents of the claims. In this article, these embodiments of the present invention may be represented individually or collectively by the term "invention", which is only for convenience, and if more than one invention is actually disclosed, it is not intended to automatically limit the scope of the application to any single invention or inventive concept.

[0034] The EUHT (Enhanced Ultra High Throughput) system used in the present invention includes a normal mode and a low error mode. The normal mode mainly works in the medium and high signal-to-noise ratio environment of the sub-6GHz frequency band, eMBB and mMTC; the low error mode mainly works in the low signal-to-noise ratio environment of sub-6GHz, URLLC and mMTC;

[0035] Both the normal mode and the low error mode are scheduled by the CAP. The terminal STA synchronizes with the different sequences of the two modes to determine which mode it belongs to.

[0036] The following introduces the methods of implementing frequency domain multiplexing in normal mode and low error mode respectively.

[0037] Embodiment 1

[0038] This embodiment provides a method for implementing frequency domain multiplexing in a wireless communication system, which is applicable to an OFDMA mode in a normal mode; Figure 1 As shown, including:

[0039] S1. Allocate frequency domain resources: divide the frequency domain resources into multiple resource units RU (Resource Unit), and each STA is allocated at least one resource unit, wherein the resource unit includes multiple frequency domain data subcarriers;

[0040] Specifically, the frequency domain data subcarriers are divided into a plurality of resource units according to the number of frequency domain data subcarriers and the subcarrier spacing; the resource unit is a basic unit for resource allocation;

[0041] The basic unit in the frequency domain is changed from a subchannel to a subcarrier-level resource unit RU. The system can include multiple STAs, each of which can be allocated one RU, or multiple RUs. In this way, the granularity of the system frequency domain multiplexing becomes finer and can support more STAs at the same time.

[0042] The one resource unit includes 16 frequency domain data subcarriers; the resource units are continuous and non-overlapping;

[0043] For example, the bandwidth is 20M. Figure 2 As shown, one resource unit RU in the frequency domain corresponds to one OFDM symbol in the time domain. The number of frequency domain data subcarriers of 20M bandwidth is 224, and the subcarrier spacing is 78.125kHz. It can be divided into 14 RUs, and each RU includes 16 subcarriers.

[0044] S2. Indicates the resource allocation of uplink and downlink transmission channels in the control channel according to the number of resource units occupied by the STA;

[0045] The control channel adopts MCS101 transmission and LPDC coding. The control channel consists of multiple unicast and broadcast scheduling signaling;

[0046] The number of resource units occupied by each STA is defined in the control channel CCH (Control channel). Specifically, CAP performs resource allocation and indication, and indicates the effective basic resource unit RU position, the starting OFDM symbol index of the STA resource group, the number of consecutive symbols occupied by the resource group, and the transmission resources used for signaling and feedback through bit definition in the control channel;

[0047] Table 1 is the definition of uplink and downlink scheduling signaling fields;

[0048]

[0049]

[0050]

[0051] Table 1 Definition of uplink and downlink scheduling signaling fields

[0052] When the bandwidth is 20M, it includes 14 resource units RU. Each STA can occupy 1-14 RUs. When a STA occupies 14 RUs, the entire bandwidth is scheduled to the STA.

[0053] Specifically, the indication of OFDMA resource allocation is represented by b5b4b3b2 in the control channel, indicating the basic bandwidth subchannel position where the scheduling signaling is valid;

[0054] b 68 b67 …b 56 b7 indicates the location of the basic resource unit RU in OFDMA mode where scheduling signaling is valid, and each bit indicates whether the corresponding RU is occupied;

[0055] b 16 b 15 …b8 indicates the starting OFDM symbol index of the STA resource group, with a domain value of 0-510;

[0056] b 32 b 31 …b 24 Indicates the number of consecutive OFDM symbols occupied by the STA resource group, with a domain value of 1-511;

[0057] b 54 b 53 …b 48 Indicates the resources used for signaling and feedback transmission within the STA resource group. The domain value is 0-63.

[0058] S3. Set the basic OFDM parameters for different subcarrier spacing and bandwidth;

[0059] Sub6G has three types of subcarrier spacing parameters: 19.53kHz, 39.0625kHz and 78.125kHz. 19.53kHz and 39.0625kHz are optional for product implementation. Different subcarrier spacing parameters support different bandwidths.

[0060] Setting OFDM basic parameters according to different subcarrier spacing and bandwidth, the basic parameters including: number of data subcarriers, number of phase tracking pilot subcarriers, phase tracking pilot index, number of virtual subcarriers, and virtual subcarrier index;

[0061] According to different bandwidth indexes n, a phase tracking pilot index set under corresponding bandwidth is generated;

[0062] According to different bandwidth indexes n, a virtual subcarrier index set under the corresponding bandwidth is generated.

[0063] Specifically, OFDM parameters with different subcarrier spacing and bandwidth settings are shown in Table 2, Table 3 and Table 4:

[0064]

[0065] Table 2 Basic OFDM parameters when the subcarrier spacing is 19.53125kHz

[0066]

[0067]

[0068] Table 3 Basic OFDM parameters when the subcarrier spacing is 39.0625kHz

[0069]

[0070]

[0071] Table 4 Basic OFDM parameters when the subcarrier spacing is 78.125kHz

[0072] S4. Set the channel state information CSI (Channel State Information). Table 5 shows the channel state information CSI matrix report field under OFDMA:

[0073]

[0074] Table 5 CSI matrix report fields

[0075] Where Nr is the number of CSI matrix rows of the feedback request;

[0076] The CQI information in the table is represented by SNR, which is encoded as 8 bits; the decimal number corresponding to the 8 bits is n, with a value of 0-255, indicating that the linear average value of the SNR of each subcarrier is (dB).

[0077] S5. Configure the channel quality feedback frame CQI (Channel Quality Indication);

[0078] like Figure 3 As shown, the CQI information part of the channel quality feedback frame body includes subchannel mapping, MCS1 and MCS2, coding type and signal to interference plus noise ratio SINR (Signal to Interference plus Noise Ratio) information; the number of bits occupied is: 4, 7, 7, 2, 64;

[0079] The SINR information includes the SINRs of different resource units RUs allocated to different spatial streams;

[0080] Specifically, Table 6 shows the CQI information part:

[0081]

[0082]

[0083]

[0084] Table 6 CQI information part

[0085] S6. Generate a downlink cell reference signal CRS (Cell Reference Signal) and an uplink demodulation reference signal DRS (Demodulation Reference Signal);

[0086] The cell reference signal CRS is used for downlink channel quality measurement and downlink channel estimation;

[0087] The demodulation reference signal DRS is used for uplink channel estimation, coherent detection and demodulation on the CAP side;

[0088] The CRS long preamble is composed of a random sequence PN (Pseudo-Noise Sequence) with a length of 114 points, which is represented by 2 repetition cycles in the time domain and is used for system fine synchronization and channel estimation. The synchronization includes time synchronization and frequency synchronization.

[0089] The DRS sequence is a pseudo-random sequence PN sequence, and the pilot sequence generation polynomial is 1+X 11 +X 15 ;

[0090] After the sequence is generated, it is modulated by BPSK (Binary Phase Shift Keying) to obtain the pilot symbol sequence {s i}i=0,1,…,32767; the initial state of the register is [0 0 1 0 1 0 1 1 a6 a5 a4 a3 a2 a1 a0], where a6a5…a0 is the lowest 7 bits of the MAC address of the CAP.

[0091] Embodiment 2

[0092] The short preamble sequence S-preamble in normal mode is a frequency domain ZC sequence, which is represented by 9 repetition periods in the time domain, including the cyclic prefix CP at both ends;

[0093] The low error mode mainly works in low signal-to-noise ratio environments; Figure 4 The figure shows a schematic diagram of the frame structure in the low error mode; the short preamble sequence S-preamble in the low error mode is 7 repeated PN sequences with a length of 255, and the frame detection, time and frequency synchronization, and AGC functions of the S-preamble are completed through multiple repetition cycles. Due to the increase in the correlation length, the low error mode can also ensure the accuracy of time synchronization and frequency offset estimation under extremely low signal-to-noise ratio;

[0094] Therefore, the normal mode and the low error mode can be distinguished by pre-pilot sequence detection.

[0095] This embodiment provides a method for implementing frequency domain multiplexing in a wireless communication system, which is applicable to an OFDMA mode in a low error mode:

[0096] S1. Allocating frequency domain resources: Dividing frequency domain resources into multiple resource units RU, dividing frequency domain data subcarriers into multiple resource units according to the number of frequency domain data subcarriers and subcarrier spacing; the resource unit is a basic unit for resource allocation;

[0097] One resource unit includes 16 subcarriers; the resource units are continuous and non-overlapping.

[0098] S2. According to the number of resource units RU occupied by the STA, the resource allocation of the uplink and downlink transmission channels is indicated in the control channel;

[0099] STA can be allocated one RU, or all RUs;

[0100] In low error mode, OFDMA is divided into full resource unit Full RU mode and single resource unit Single RU mode:

[0101] In Full RU mode, a user STA occupies all RUs, and the b 31 Specify; frequency domain can be repeated in Full RU mode;

[0102] In Single RU mode, each STA occupies one RU, which is controlled by the b 14 b 13 and b 18 b 17 Specified; frequency domain cannot be repeated in Single RU mode.

[0103] In low error mode, the control channel adopts MCS1 transmission without space-time coding. The effective basic resource unit RU position, the starting OFDM symbol index of the STA resource group, the number of consecutive symbols occupied by the resource group, and the resources used for signaling and feedback transmission are indicated by bit definition in the control channel.

[0104] Table 7 shows the definition of uplink and downlink scheduling signaling fields in low error mode:

[0105]

[0106]

[0107]

[0108] Table 7 Definition of uplink and downlink scheduling signaling fields in low error mode b 14 b 13 Used to indicate the number of downlink frequency domain repetitions;

[0109] b 16 b15 Used to indicate the number of downlink time domain repetitions;

[0110] b 18 b 17 Used to indicate the number of uplink frequency domain repetitions;

[0111] b 20 b 19 Used to indicate the number of uplink time domain repetitions.

[0112] S3. Set OFDM parameters for different subcarrier spacing and bandwidth;

[0113] Sub6G has three types of subcarrier spacing parameters: 19.53kHz, 39.0625kHz and 78.125kHz. 19.53kHz and 39.0625kHz are optional for product implementation. Different subcarrier spacing parameters support different bandwidths.

[0114] Setting OFDM basic parameters according to different subcarrier spacing and bandwidth, the basic parameters including: number of data subcarriers, number of phase tracking pilot subcarriers, phase tracking pilot index, number of virtual subcarriers, and virtual subcarrier index;

[0115] The OFDM parameters for different subcarrier spacing and bandwidth in low error mode are the same as those in normal mode, so refer to Tables 2, 3, and 4;

[0116] The channel quality feedback frame CQI in the low error mode refers to Table 6 in the normal mode.

[0117] S4. Generate a downlink cell reference signal CRS and an uplink demodulation reference signal DRS;

[0118] CRS is a PN sequence with a length of 511, and there are 64 zero values ​​before and after to prevent multipath interference. Due to the increase in correlation length, the accuracy of channel estimation under extremely low signal-to-noise ratio is also guaranteed;

[0119] In the uplink, if working in Single RU mode, the channel estimation symbol can choose to use the DRS of the normal mode (i.e., the PN sequence generated in step S6 of Example 1); if working in Full RU OFDMA mode, the channel estimation symbol can choose the CRS consistent with the downlink, and the DRS of the normal mode can also be added to ensure flexibility and performance under single-user and multi-user operation.

[0120] Embodiment 3

[0121] This embodiment provides a device 30 for implementing frequency domain multiplexing in a wireless communication system, including: a central access point 31, a site 32;

[0122] The central access point 31, such as Figure 5 As shown, including:

[0123] A division module 311 is used to allocate frequency domain resources, divide the frequency domain resources into a plurality of resource units RU, and divide the frequency domain data subcarriers into a plurality of resource units according to the number of frequency domain data subcarriers and the subcarrier spacing;

[0124] The one resource unit includes 16 subcarriers; the resource units are continuous and non-overlapping;

[0125] An allocation module 312, configured to allocate the plurality of resource units RU to one or more sites 32;

[0126] The processing module 313 is used to indicate the resource allocation of the uplink and downlink transmission channels and set the basic system parameters in the control channel according to the number of resource units occupied by the STA;

[0127] Specifically, Figure 5a As shown, the processing module 313 includes:

[0128] The first processing unit 313a is used to indicate resource allocation of uplink and downlink transmission channels;

[0129] The second processing unit 313b is used to generate OFDM basic parameters according to different subcarrier spacing and bandwidth;

[0130] The basic system parameters include: the number of data subcarriers, the number of phase tracking pilot subcarriers, the phase tracking pilot index, the number of virtual subcarriers, and the virtual subcarrier index;

[0131] The third processing unit 313c is used to configure a channel quality feedback frame CQI, wherein the CQI information part of the channel quality feedback frame body includes subchannel mapping, MCS1 and MCS2, coding type and SINR information; the number of bits occupied is: 4, 7, 7, 2, 64;

[0132] The fourth processing unit 313d is configured to generate a downlink cell reference signal CRS and an uplink demodulation reference signal DRS;

[0133] The fourth processing unit 313d generates corresponding CRS and DRS according to whether the system is in normal mode or low error mode.

[0134] It will be appreciated by those skilled in the art that the various exemplary method steps and device units described herein in conjunction with the disclosed embodiments can all be implemented in electronic hardware, software, or a combination of the two. In order to clearly illustrate the interchangeability between hardware and software, the various exemplary steps and units are generally described in the form of their functionality. Whether this functionality is implemented in hardware or software depends on the design constraints implemented by the specific application and the entire system. Those skilled in the art can implement the described functionality in a variety of ways for each specific application, but the results of this implementation should not be interpreted as departing from the scope of the present invention.

[0135] The steps of the method described in conjunction with the above disclosed embodiments may be directly embodied as hardware, a software module executed by a processor, or a combination of the two. The software module may exist in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A typical storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative embodiment, the storage medium is an integral part of the processor. The processor and the storage medium may exist in an ASIC. The ASIC may exist in a user station. In an alternative embodiment, the processor and the storage medium may exist as discrete components in a user station.

[0136] According to the disclosed embodiments, it is possible for those skilled in the art to implement or use the present invention. It is obvious to those skilled in the art that various modifications of these embodiments are possible, and the general principles defined herein can also be applied to other embodiments without departing from the scope and gist of the present invention. The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for implementing frequency domain multiplexing in a wireless communication system, characterized in that: include: Allocate frequency domain resources: divide the frequency domain resources into multiple resource units, and each STA is allocated at least one resource unit, where the resource unit includes multiple subcarriers; According to the number of resource units occupied by STA, the resource allocation of uplink and downlink transmission channels is indicated in the control channel, and the basic system parameters are set according to different subcarrier spacing and bandwidth; The dividing the frequency domain resources into a plurality of resource units comprises: According to the number of frequency domain data subcarriers and the subcarrier spacing, the frequency domain data subcarriers are divided into a plurality of resource units; the resource unit is a basic unit for resource allocation; one resource unit includes 16 frequency domain data subcarriers; the resource units are continuous and non-overlapping; Set the downlink channel cell reference signal and uplink channel demodulation reference signal according to the system working mode; The working modes include: normal mode and low error mode; Among them, the uplink and downlink scheduling signaling bit field in normal mode includes b0...b 84 , where each bit field is defined as follows: When b0=1, it is defined as downlink scheduling; when b0=0, it is defined as uplink scheduling; When b1=0, it is defined as SU-MIMO transmission; when b1=1, it is defined as MU-MIMO transmission; [b5b4…b2] define a bit map to indicate the location of the basic bandwidth subchannel where the scheduling signaling is valid; b6 defines the transmission mode of this scheduling: 0: open-loop transmission; 1: closed-loop transmission; b7 defines the Bit Map indicating the basic RU location where the scheduling signaling is valid in OFDMA mode. 68 b 67 …b 56 Combined, each bit indicates whether the RU is occupied; b 16 b 15 …b8 defines the starting OFDM symbol index of the user resource group, the domain value is: 0~510; b 23 b 22 …b 17 Define the MCS of codeword I and the number of parallel spatial streams ≤ 4; b 32 b 31 …b 24 Defines the number of consecutive OFDM symbols in the user resource group. The range is 1 to 511. b 39 b 38 …b 33 For the DL part, the MCS and parallel spatial stream number of codeword II are defined as follows: 1111111, this transmission is SU-MIMO without codeword II; 1111110, this transmission is 2-stream MU-MIMO; 1111101, this transmission is 3-stream MU-MIMO; 1111100, this transmission is 4-stream MU-MIMO; 1111011, this transmission is 5-stream MU-MIMO; 1111010, this transmission is 6-stream MU-MIMO; 1111001, this transmission is 7-stream MU-MIMO; 1111000, this transmission is 8-stream MU-MIMO; 0000000~1100011, MCS and stream number of SU-MIMO codeword II; For the UL part, b is defined 42 b 41 ≠11, b 36 b 35 …b 33 , BitMap indicates CQI, CSI, or BFM feedback subchannel; define b 39 b 38 b 37 For CSI feedback, indicates the number of rows in the feedback matrix; define b 39 b 38 b 37 For BFM feedback, indicates the number of columns in the feedback matrix; define b 42 b 41 =11, MCS indication for uplink 4 or more streams; MCS of codeword II; defines 0000000~1100011, MCS and number of streams of SU-MIMO codeword II; b 42 b 41 b 40 For the DL part, define SU-MIMO: 000; MU-MIMO: spatial stream starting position index, domain value 0 to 7; for the UL part, define in b 40 =1, request CQI feedback below 4 streams; defined in b 42 b 41 = 01, request CSI feedback below 4 streams; defined in b 42 b 41 = 10, request BFM feedback below 4 streams; defined in b 42 b 41 =11, MCS indication for uplink 4 or more streams; b 44 b 43 Define 00 as BCC coding; 01 as LDPC code length 1 determined by the capability negotiation response frame; 10 as LDPC code length 2 determined by the capability negotiation response frame; 11 as LDPC code length 3 determined by the capability negotiation response frame; b 45 Define 0 as the time domain short demodulation pilot interval 0; 1 as the time domain long demodulation pilot interval 1; b 47 b 46 Position 00 is the frequency domain demodulation pilot pattern 1 of DPI=1; 01 is the frequency domain demodulation pilot pattern 2 of DPI=2; 10 is the frequency domain demodulation pilot pattern 3 of DPI=4; 11 is reserved; b 54 b 53 …b 48 When b1=0, SU-MIMO transmission is performed; when b 48 = 0, b 54 …b 49 Indicates the resources used for signaling and feedback transmission in this user resource group, with a domain value of 0 to 63; in b 48 =1, b 54 …b 49 Reserved; and for the DL part, when b1=1, downlink MU-MIMO transmission is performed, b54..b48, reserved; for the UL part, when b1=1, the total number of uplink MU-MIMO streams and the starting position index of the spatial stream; b54..b52; 001, this transmission is 2-stream MU-MIMO; 010, this transmission is 3-stream MU-MIMO; 011, this transmission is 4-stream MU-MIMO; 100, this transmission is 5-stream MU-MIMO; 101, this transmission is 6-stream MU-MIMO; 110, this transmission is 7-stream MU-MIMO; 111, this transmission is 8-stream MU-MIMO; b51..b49, spatial stream starting position index, domain value 0 to 7; b 55 Defined in STBC mode format 0 determined based on capability negotiation, 0 means not using STBC transmission; 1 means using STBC transmission; in precoding mode format 1 determined based on capability negotiation, 0 means precoding 8 SU-MIMO groups and 1 MU-MIMO group; 1 means precoding 16 SU-MIMO groups and 4 MU-MIMO groups; b 68 b 67 …b 56 Define a Bit Map to indicate the basic RU location where the scheduling signaling is valid in OFDMA mode, and each bit indicates whether the RU is occupied; b 84 b 83 …b 69 Define CRC check protection and STAID identification; in addition, b 84 b 83 …b 69 The CRC checksum of the unicast scheduling signaling field is XORed with the unique 12-bit ID of the cell assigned by the CAP; The control channel uses a 16-bit CRC check, and the CRC generating polynomial is g(D)=D 16 +D 12 +D 5 +1; Among them, the uplink and downlink scheduling signaling bit fields b0…b in low error mode 55 ; Among them, each bit field is defined as follows: b3b2...b0 defines the lower 4 bits of the CAP MAC address, CAP identifier and scrambling code seed; b4 defines the frame length: 0: 0.5ms; 1: 1ms; b5 defines OFDMA indication: 0: non-OFDMA mode; 1: OFDMA mode; b8b7b6 defines DL / UL ratio: 000:1:1; 001:2:1; 010:4:1; 011:8:1; 100:1:2; 101:1:4; 110:1:8; 111: reserved; b9 defines the downlink MCS: 0: QPSK, 1 / 2 coding rate; 1: QPSK, 4 / 7 coding rate; b 10 Define uplink MCS: 0: QPSK, 1 / 2 coding rate; 1: QPSK, 4 / 7 coding rate; b 11 Define the downlink coding type: 0: TBCC coding; 1: LDPC coding with a code length of 448; b 12 Define uplink coding type: 0: TBCC coding; 1: LDPC coding with code length of 448; b 14 b 13 Define the number of downlink frequency domain repetitions: when b5=0, non-OFDMA mode, frequency domain repetition is supported, 00:1; 01:2; 10:4; 11:8; when b5=1, OFDMA mode, frequency domain repetition is not supported, [b18b17b14b13], BitMap indicates the basic RU subchannel position where the scheduling signaling is valid in OFDMA mode; 0000~1101: RU#1~RU#14; 1110: reserved; 1111: occupying the full bandwidth; b 16 b 15 Define the number of repetitions in the downlink time domain: 00:1; 01:2; 10:3; 11:4; b 18 b 17 Define the number of uplink frequency domain repetitions: when b5=0, non-OFDMA mode, frequency domain repetition is supported, 00:1; 01:2; 10:4; 11:8; when b5=1, OFDMA mode, frequency domain repetition is not supported, [b18b17b14b13], BitMap indicates the basic RU subchannel position where the scheduling signaling is valid in OFDMA mode; 0000~1101: RU#1~RU#14; 1110: reserved; 1111: occupying the full bandwidth; b 20 b 19 Define the uplink time domain repetition times: 00:1; 01:2; 10:3; 11:4; b 26 b 22 ...b 21 Define frame number: 0-63, frame number count; b 27 Define uplink scheduling request channel configuration: 0: no uplink scheduling request channel; 1: configure uplink scheduling request channel; b 28 Define uplink random access channel configuration: 0: no uplink random access channel; 1: configure uplink random access channel; b 29 Define RACH and ranging indication: b29=0, RACH; b29=1, ranging; b 31 b 30 Define reservations; b 55 b 54 ...b 32 Define 24-bit CRC: CRC check protection; and b 55 b 54 ..b 32 The CRC checksum of the unicast scheduling signaling field is XORed with the unique 12-bit ID of the cell assigned by the CAP; The control channel uses a 24-bit CRC check, and the CRC generating polynomial is: g(D) = D 24 +D 23 +D 18 +D 17 +D 14 +D 11 +D 10 +D 7 +D 6 +D 5 +D 4 +D 3 +D+1; the number of uplink and downlink symbols is calculated from the uplink and downlink ratio; for 0.5ms frame, DLTCH_symbol_number=floor(12*DL_Ratio / (DL_Ratio+UL_Ratio)); ULTCH_symbol_number=N1-DLTCH_symbol_number; for 1ms frame, DLTCH_symbol_number=floor(43*DL_Ratio / (DL_Ratio+UL_Ratio)); ULTCH_symbol_number=N2-DLTCH_symbol_number; wherein, N1=12, N2=43, are the sum of uplink and downlink TCH service symbols after removing the preamble and DGI / UGI of 0.5ms frame and 1ms frame respectively, and the uplink and downlink ratio is scheduled by the number of symbols obtained after repetition of uplink and downlink payload not exceeding N1 or N2.

2. The method for implementing frequency domain multiplexing according to claim 1, characterized in that: The basic system parameters include: the number of data subcarriers, the number of phase tracking pilot subcarriers, the phase tracking pilot index, the number of virtual subcarriers, and the virtual subcarrier index.

3. The method for implementing frequency domain multiplexing according to claim 2, characterized in that: According to different bandwidth indexes, a phase tracking pilot index set under corresponding bandwidth is generated; According to different bandwidth indexes, a virtual subcarrier index set under the corresponding bandwidth is generated.

4. The method for implementing frequency domain multiplexing according to claim 1, characterized in that: Resource allocation and indication are achieved through bit definition in the control channel, including indicating the valid basic resource unit location, the starting OFDM symbol index of the STA resource group, the number of consecutive symbols occupied by the resource group, and the transmission resources used for signaling and feedback.

5. The method for implementing frequency domain multiplexing according to claim 1, characterized in that: Also includes: Configure a channel quality feedback frame, the frame body information of which includes: subchannel mapping, MCS1 and MCS2, coding type, and signal to interference and noise ratio SINR information; The SINR information includes SINRs of different resource units allocated to different spatial streams.

6. A central access point for implementing frequency domain multiplexing, characterized in that: include: A division module is used to allocate frequency domain resources and divide the frequency domain data subcarriers into multiple resource units according to the number of frequency domain data subcarriers and the subcarrier spacing; An allocation module, configured to allocate the plurality of resource units to one or more stations STA; A processing module, used to indicate resource allocation of uplink and downlink transmission channels and set basic system parameters in a control channel according to the number of resource units occupied by STAs; The dividing the frequency domain resources into a plurality of resource units comprises: dividing the frequency domain data subcarriers into a plurality of resource units according to the number of frequency domain data subcarriers and the subcarrier spacing; the resource unit is a basic unit for resource allocation; each resource unit comprises 16 frequency domain data subcarriers, and the resource units are continuous and non-overlapping; The processing module includes: a first processing unit, used to indicate resource allocation of uplink and downlink transmission channels; a second processing unit, used to generate basic system parameters according to different subcarrier spacings and bandwidths; a third processing unit, used to configure a channel quality feedback frame; a fourth processing unit, used to generate a downlink cell reference signal and an uplink demodulation reference signal according to a system operating mode, wherein the operating mode includes a normal mode and a low error mode; Among them, the uplink and downlink scheduling signaling bit field in normal mode includes b0...b 84 , where each bit field is defined as follows: When b0=1, it is defined as downlink scheduling; when b0=0, it is defined as uplink scheduling; When b1=0, it is defined as SU-MIMO transmission; when b1=1, it is defined as MU-MIMO transmission; [b5 b4…b2] defines a bit map to indicate the location of the basic bandwidth subchannel where the scheduling signaling is valid; b6 defines the transmission mode of this scheduling: 0: open-loop transmission; 1: closed-loop transmission; b7 defines the Bit Map indicating the basic RU location where the scheduling signaling is valid in OFDMA mode. 68 b 67 …b 56 Combined, each bit indicates whether the RU is occupied; b 16 b 15 …b8 defines the starting OFDM symbol index of the user resource group, the domain value is: 0~510; b 23 b 22 …b 17 Define the MCS of codeword I and the number of parallel spatial streams ≤ 4; b 32 b 31 …b 24 Defines the number of consecutive OFDM symbols in the user resource group. The range is 1 to 511. b 39 b 38 …b 33 For the DL part, the MCS and parallel spatial stream number of codeword II are defined as follows: 1111111, this transmission is SU-MIMO without codeword II; 1111110, this transmission is 2-stream MU-MIMO; 1111101, this transmission is 3-stream MU-MIMO; 1111100, this transmission is 4-stream MU-MIMO; 1111011, this transmission is 5-stream MU-MIMO; 1111010, this transmission is 6-stream MU-MIMO; 1111001, this transmission is 7-stream MU-MIMO; 1111000, this transmission is 8-stream MU-MIMO; 0000000~1100011, MCS and stream number of SU-MIMO codeword II; For the UL part, b is defined 42 b 41 ≠11, b 36 b 35 …b 33 , BitMap indicates CQI, CSI, or BFM feedback subchannel; define b 39 b 38 b 37 For CSI feedback, indicates the number of rows in the feedback matrix; define b 39 b 38 b 37 For BFM feedback, indicates the number of columns in the feedback matrix; define b 42 b 41 β11, MCS indication for uplink 4 or more streams; MCS of codeword II; defines 0000000~1100011, MCS and number of streams of SU-MIMO codeword II; b 42 b 41 b 40 For the DL part, define SU-MIMO: 000; MU-MIMO: spatial stream starting position index, domain value 0 to 7; for the UL part, define in b 40 When β1, request CQI feedback of less than 4 streams; defined in b 42 b 41 When β01, request CSI feedback of less than 4 streams; defined in b 42 b 41 When β10, request BFM feedback below 4 streams; defined in b 42 b 41 When β11, MCS indication for uplink 4 or more streams; b 44 b 43 Define 00 as BCC coding; 01 as LDPC code length 1 determined by the capability negotiation response frame; 10 as LDPC code length 2 determined by the capability negotiation response frame; 11 as LDPC code length 3 determined by the capability negotiation response frame; b 45 Define 0 as the time domain short demodulation pilot interval 0; 1 as the time domain long demodulation pilot interval 1; b 47 b 46 Position 00 is the frequency domain demodulation pilot pattern 1 of DPI=1; 01 is the frequency domain demodulation pilot pattern 2 of DPI=2; 10 is the frequency domain demodulation pilot pattern 3 of DPI=4; 11 is reserved; b 54 b 53 …b 48 When b1=0, SU-MIMO transmission is performed; when b 48 = 0, b 54 …b 49 Indicates the resources used for signaling and feedback transmission in this user resource group, with a domain value of 0 to 63; in b 48 =1, b 54 …b 49 Reserved; and for the DL part, when b1=1, downlink MU-MIMO transmission is performed, b54..b48, reserved; for the UL part, when b1=1, the total number of uplink MU-MIMO streams and the starting position index of the spatial stream; b54..b52; 001, this transmission is 2-stream MU-MIMO; 010, this transmission is 3-stream MU-MIMO; 011, this transmission is 4-stream MU-MIMO; 100, this transmission is 5-stream MU-MIMO; 101, this transmission is 6-stream MU-MIMO; 110, this transmission is 7-stream MU-MIMO; 111, this transmission is 8-stream MU-MIMO; b51..b49, spatial stream starting position index, domain value 0 to 7; b 55 Defined in STBC mode format 0 determined based on capability negotiation, 0 means not using STBC transmission; 1 means using STBC transmission; in precoding mode format 1 determined based on capability negotiation, 0 means precoding 8 SU-MIMO groups and 1 MU-MIMO group; 1 means precoding 16 SU-MIMO groups and 4 MU-MIMO groups; b 68 b 67 …b 56 Define a Bit Map to indicate the basic RU location where the scheduling signaling is valid in OFDMA mode, and each bit indicates whether the RU is occupied; b 84 b 83 …b 69 Define CRC check protection and STAID identification; in addition, b 84 b 83 …b 69 The CRC checksum of the unicast scheduling signaling field is XORed with the unique 12-bit ID of the cell assigned by the CAP; The control channel uses a 16-bit CRC check, and the CRC generating polynomial is g(D)=D 16 +D 12 +D 5 +1; Among them, the uplink and downlink scheduling signaling bit fields b0…b in low error mode 55 ; Among them, each bit field is defined as follows: b3b2...b0 defines the lower 4 bits of the CAP MAC address, CAP identifier and scrambling code seed; b4 defines the frame length: 0: 0.5ms; 1: 1ms; b5 defines OFDMA indication: 0: non-OFDMA mode; 1: OFDMA mode; b8b7b6 defines DL / UL ratio: 000:1:1; 001:2:1; 010:4:1; 011:8:1; 100:1:2; 101:1:4; 110:1:8; 111: reserved; b9 defines the downlink MCS: 0: QPSK, 1 / 2 coding rate; 1: QPSK, 4 / 7 coding rate; b 10 Define uplink MCS: 0: QPSK, 1 / 2 coding rate; 1: QPSK, 4 / 7 coding rate; b 11 Define the downlink coding type: 0: TBCC coding; 1: LDPC coding with a code length of 448; b 12 Define uplink coding type: 0: TBCC coding; 1: LDPC coding with code length of 448; b 14 b 13 Define the number of downlink frequency domain repetitions: when b5=0, non-OFDMA mode, frequency domain repetition is supported, 00:1; 01:2; 10:4; 11:8; when b5=1, OFDMA mode, frequency domain repetition is not supported, [b18b17b14b13], BitMap indicates the basic RU subchannel position where the scheduling signaling is valid in OFDMA mode; 0000~1101: RU#1~RU#14; 1110: reserved; 1111: occupying the full bandwidth; b 16 b 15 Define the number of repetitions in the downlink time domain: 00:1; 01:2; 10:3; 11:4; b 18 b 17 Define the number of uplink frequency domain repetitions: when b5=0, non-OFDMA mode, frequency domain repetition is supported, 00:1; 01:2; 10:4; 11:8; when b5=1, OFDMA mode, frequency domain repetition is not supported, [b18b17b14b13], BitMap indicates the basic RU subchannel position where the scheduling signaling is valid in OFDMA mode; 0000~1101: RU#1~RU#14; 1110: reserved; 1111: occupying the full bandwidth; b 20 b 19 Define the uplink time domain repetition times: 00:1; 01:2; 10:3; 11:4; b 26 b 22 …b 21 Define frame number: 0-63, frame number count; b 27 Define uplink scheduling request channel configuration: 0: no uplink scheduling request channel; 1: configure uplink scheduling request channel; b 28 Define uplink random access channel configuration: 0: no uplink random access channel; 1: configure uplink random access channel; b 29 Define RACH and ranging indication: b29=0, RACH; b29=1, ranging; b 31 b 30 Define reservations; b 55 b 54 …b 32 Define 24-bit CRC: CRC check protection; and b 55 b 54 ..b 32 The CRC checksum of the unicast scheduling signaling field is XORed with the unique 12-bit ID of the cell assigned by the CAP; The control channel uses a 24-bit CRC check, and the CRC generating polynomial is: g(D) = D 24 +D 23 +D 18 +D 17 +D 14 +D 11 +D 10 +D 7 +D 6 +D 5 +D 4 +D 3 +D+1; the number of uplink and downlink symbols is calculated from the uplink and downlink ratio; for 0.5ms frame, DLTCH_symbol_number=floor(12*DL_Ratio / (DL_Ratio+UL_Ratio)); ULTCH_symbol_number=N1-DLTCH_symbol_number; for 1ms frame, DLTCH_symbol_number=floor(43*DL_Ratio / (DL_Ratio+UL_Ratio)); ULTCH_symbol_number=N2-DLTCH_symbol_number; wherein, N1=12, N2=43, are the sum of uplink and downlink TCH service symbols after removing the preamble and DGI / UGI of 0.5ms frame and 1ms frame respectively, and the uplink and downlink ratio is scheduled by the number of symbols obtained after repetition of uplink and downlink payload not exceeding N1 or N2.

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