WO2017020174A1 - Procédé et appareil de transmission d'informations de charge - Google Patents

Procédé et appareil de transmission d'informations de charge Download PDF

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Publication number
WO2017020174A1
WO2017020174A1 PCT/CN2015/085741 CN2015085741W WO2017020174A1 WO 2017020174 A1 WO2017020174 A1 WO 2017020174A1 CN 2015085741 W CN2015085741 W CN 2015085741W WO 2017020174 A1 WO2017020174 A1 WO 2017020174A1
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mhz channel
channel
frequency space
mhz
utilization
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PCT/CN2015/085741
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English (en)
Chinese (zh)
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刘乐
蓝洲
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华为技术有限公司
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Priority to CN201580081727.XA priority Critical patent/CN107852674B/zh
Priority to PCT/CN2015/085741 priority patent/WO2017020174A1/fr
Publication of WO2017020174A1 publication Critical patent/WO2017020174A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a load information transmission method and apparatus.
  • WLAN Wireless Local Area Network
  • the existing channel bonding in 802.11ac is composed of a main 20MHz channel extension sub-20MHz channel consisting of 40MHz continuous, and then extending the sub-40MHz channel to form a continuous 80MHz, and the extended sub-80MHz channel is composed of 160MHz or discontinuous 80MHz+80MHz (The specific channel bonding structure is shown in Table 1.
  • the AP measures and sends a basic service set (Basic Service Set, BSS) in a Beacon frame or a Probe response frame.
  • BSS Basic Service Set
  • the load information, the existing load information elements (BSS load element) in 802.11ac are shown in Table 2, where each domain is defined as follows:
  • Element ID used to identify that the media access control frame (MAC frame) is a BSS load element MAC frame;
  • Length indicates the length of the BSS load element MAC frame
  • MU-MIMO capable STA count used to indicate the number of users supporting receiving 801.11ac DL MU-MIMO in the BSS;
  • Spatial stream underutilization used to indicate the spatial stream utilization on the primary 20MHz channel (primary20MHz-channel);
  • Observable secondary 40MMHz utilization used to indicate the spatial stream utilization of the sub 40MHz channel
  • Observable secondary 80MMHz utilization used to indicate the spatial stream utilization of the secondary 80MHz channel
  • N max_SS is the maximum number of multiplexed streams AP (for example: 8-antenna case 8 stream)
  • T busy is a Clear Channel Assessment (Clear Channel Assessment, CCA) determine the length of channel busy time, T utilized defined in The sum of the weighted transmission times of all the real occupied spatial streams of the primary channel is defined as N ss,i is the number of occupied space streams within the transmission time T i .
  • the spectrum utilization of all 20 MHz channels in the bandwidth of the existing 802.11ac system is the same. Therefore, the information of the existing BSS load only indicates the spectrum utilization of a 20 MHz channel.
  • 802.11ax systems support Orthogonal Frequency Division Multiple Access (OFDM) and multi-user Multiple Input Multiple Access (OFDMA) and Multi-User Multiple-Input (Multi-User Multiple-Input) Multiple-Output, MU-MIMO
  • OFDM Orthogonal Frequency Division Multiple Access
  • OFDMA multi-user Multiple Input Multiple Access
  • Multi-User Multiple-Input Multi-User Multiple-Input
  • MU-MIMO Multi-User Multiple-Input
  • the present invention provides a load information transmission method.
  • the method and apparatus provided by the present invention solve the problem that the load information transmission method in the prior art leads to low resource utilization.
  • a method for transmitting load information comprising:
  • the access point AP measures frequency space stream utilization of each unit bandwidth channel within the available bandwidth of the AP within a set time range, wherein the frequency space stream utilization is a frequency resource block allocated on the unit bandwidth channel The ratio of the spatial stream used to transmit data relative to the maximum spatial stream supported by the AP's antenna;
  • the load information element is sent to the station STA.
  • the unit bandwidth channel is a 20 MHz channel
  • the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel
  • the instructions include:
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • Average frequency space stream utilization of the secondary 80 MHz channel and within the secondary 80 MHz channel The difference in frequency space stream utilization of each 20 MHz channel relative to the average utilization of the secondary 80 MHz channel, wherein the average frequency space stream utilization of the secondary 80 MHz channel is the frequency space of four 20 MHz channels in the secondary 80 MHz channel.
  • the unit bandwidth channel is a 20 MHz channel
  • the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel
  • the instructions include:
  • the frequency space stream utilization of each 20 MHz channel in the secondary 80 MHz channel is the difference from the frequency space stream utilization of the primary 20 MHz channel, the secondary 20 MHz channel, and the two 20 MHz channels in the secondary 40 MHz channel, respectively.
  • the indication information includes:
  • the total frequency space stream utilization rate is a linear arithmetic mean value of frequency space flow utilization of at least one 20 MHz channel in the set bandwidth channel;
  • the difference is 0;
  • the difference includes the 40 MHz channel
  • the average frequency space utilization of the 40MHz channel is the frequency space stream utilization of the main 20MHz channel in the 40MHz channel
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • the average frequency space utilization of the channel is the difference obtained by the difference;
  • the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel.
  • the frequency space flow utilization rate is adopted by a formula
  • N maxSS is the maximum number of streams on each resource unit (RU: resource unit)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is the i-th idle channel Clear Channel Assessment (CCA)
  • CCA Clear Channel Assessment
  • a method for receiving load information comprising:
  • the station STA receives the load information element sent by the access point AP;
  • indication information indicating a frequency space flow utilization rate from the load information element, where the frequency space flow utilization rate includes a frequency space flow utilization rate of each unit bandwidth channel in a usable bandwidth of the AP, and The frequency space stream utilization rate is divided into the unit bandwidth channel The ratio of the spatial resource block used by the allocated frequency resource block to the maximum spatial stream supported by the antenna of the AP;
  • the STA determines an AP that needs to be accessed according to the frequency space flow utilization rate.
  • the unit bandwidth channel is a 20 MHz channel
  • the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel
  • the instructions include:
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • the average frequency spatial stream utilization is the linear arithmetic mean of the frequency spatial stream utilization of the four 20 MHz channels in the secondary 80 MHz channel.
  • the unit bandwidth channel is a 20 MHz channel
  • the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel
  • the instructions include:
  • Frequency space flow utilization of each 20 MHz channel in the secondary 80 MHz channel and main The difference in frequency space stream utilization of the 20 MHz channel, the secondary 20 MHz channel, and the two 20 MHz channels in the secondary 40 MHz channel.
  • the indication information includes:
  • the total frequency space stream utilization rate is a linear arithmetic mean value of frequency space flow utilization of at least one 20 MHz channel in the set bandwidth channel;
  • the difference is 0;
  • the difference includes a difference between a main 20 MHz channel and a secondary 20 MHz channel of the 40 MHz channel and an average frequency space stream utilization ratio of the 40 MHz channel; the 40 MHz channel
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space stream utilization of the primary 20 MHz channel and the frequency space stream utilization of the secondary 20 MHz channel in the 40 MHz channel;
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • the average frequency space utilization of the channel is the difference obtained by the difference;
  • the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel.
  • the frequency space flow utilization rate is adopted by a formula
  • N maxSS is the maximum number of streams per resource unit (RU)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is in the i-th CCA busy period T
  • the number of Nss streams used in the jth RU in the sth time subsegment in i, RU s, j is the jth RU in the sth time subsegment
  • T busy is the CCA busy time length.
  • an access point comprising:
  • a measurement module configured to measure a frequency space stream utilization rate of each unit bandwidth channel within a usable bandwidth of the AP within a set time range, wherein the frequency space stream utilization rate is an allocated frequency on the unit bandwidth channel
  • Adding a module configured to add indication information indicating the frequency space flow utilization to the load information element
  • a sending module configured to send the load information element to the station STA.
  • the adding module is specifically configured to: use a frequency space stream utilization ratio of the primary 20 MHz channel and a frequency space stream utilization rate of a secondary 20 MHz channel;
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • Average frequency space stream utilization of the secondary 80 MHz channel and within the secondary 80 MHz channel The difference in frequency space stream utilization of each 20 MHz channel relative to the average utilization of the secondary 80 MHz channel, wherein the average frequency space stream utilization of the secondary 80 MHz channel is the frequency space of four 20 MHz channels in the secondary 80 MHz channel. The average of the linear arithmetic of the flow utilization;
  • the indication information is added to the load information element.
  • the adding module is specifically configured to: use a frequency space stream utilization ratio of the primary 20 MHz channel and a frequency space stream utilization rate of a secondary 20 MHz channel;
  • the indication information is added to the load information element.
  • the adding module is specifically used to : the frequency space stream utilization of the primary 20 MHz channel within the usable bandwidth;
  • the total frequency space stream utilization rate is a linear arithmetic mean value of frequency space flow utilization of at least one 20 MHz channel in the set bandwidth channel;
  • the difference is 0;
  • the difference includes the 40 MHz channel
  • the average frequency space utilization of the 40MHz channel is the frequency space stream utilization of the main 20MHz channel in the 40MHz channel
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • the difference between the average frequency and spatial stream utilization of the channel is the difference;
  • the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • the indication information is added to the load information element.
  • the measuring module is further used to pass the formula
  • N maxSS is the maximum number of streams per resource unit (RU)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is at The number of Nss streams used in the jth RU in the sth time sub-segment in i CCA busy period T i
  • RU s, j is the jth RU in the sth time sub-segment
  • T busy Is the length of the CCA busy time.
  • a site comprising:
  • a receiving module configured to receive a load information element sent by the access point AP
  • an indication information obtaining module configured to obtain, from the load information element, indication information indicating a frequency space flow utilization, where the frequency space flow utilization rate includes a frequency space flow of each unit bandwidth channel in the available bandwidth of the AP Utilization rate, and the frequency space flow utilization rate is the unit The ratio of the spatial resource block allocated on the bandwidth channel for the spatial stream occupied by the data to be transmitted relative to the maximum spatial stream supported by the antenna of the AP;
  • a selection module configured to determine, according to the frequency space flow utilization rate, an AP that needs to be accessed.
  • the indication information obtaining module is specifically configured to obtain, from the load information element, a frequency space stream utilization ratio of the primary 20 MHz channel and a frequency space stream utilization rate of the secondary 20 MHz channel;
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space flow utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • the indication information obtaining module is specifically configured to obtain from the load information element:
  • the station of claim 16 wherein when the unit bandwidth channel is a 20 MHz channel, the available bandwidth includes a primary 20 MHz channel. And setting the bandwidth channel, the indication information acquiring module is specifically configured to obtain from the load information element:
  • the total frequency space stream utilization rate is a linear arithmetic mean value of frequency space flow utilization of at least one 20 MHz channel in the set bandwidth channel;
  • the difference is 0;
  • the difference includes a difference between a main 20 MHz channel and a secondary 20 MHz channel of the 40 MHz channel and an average frequency space stream utilization ratio of the 40 MHz channel; the 40 MHz channel
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space stream utilization of the primary 20 MHz channel and the frequency space stream utilization of the secondary 20 MHz channel in the 40 MHz channel;
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • Average frequency space utilization of the channel The difference obtained by the difference; the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • the load information sent by the AP to the STA includes the frequency space stream utilization rate of each 20 MHz channel in the bandwidth, and the overlapping basic service set (OBSS) area between the two BSSs.
  • the STA can select the BSS with a relatively small load amount according to the refined load information (including the load information of the frequency space flow utilization of each 20 MHz channel in the bandwidth), thereby effectively alleviating the imbalance of the two BSS loads.
  • the problem is to effectively improve resource utilization.
  • FIG. 1 is a schematic flowchart of a method for transmitting load information according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic diagram of a dense scene specified by 802.11ax
  • FIG. 3 is a schematic flowchart of a method for transmitting load information according to Embodiment 5 of the present invention.
  • FIG. 4 is a schematic structural diagram of an access point according to Embodiment 6 of the present invention.
  • FIG. 5 is a schematic structural diagram of a station according to Embodiment 7 of the present invention.
  • FIG. 6 is a schematic structural diagram of an access point according to Embodiment 8 of the present invention.
  • FIG. 7 is a schematic structural diagram of a station according to Embodiment 9 of the present invention.
  • an embodiment of the present invention provides a method for sending a load information, where the method specifically includes:
  • Step 101 The access point (AP) measures the frequency space stream utilization rate of each unit bandwidth channel in the available bandwidth of the AP within a set time range, where the frequency space stream utilization rate is the The ratio of the spatial resource block allocated on the unit bandwidth channel for the spatial stream occupied by the data to be transmitted relative to the maximum spatial stream supported by the antenna of the AP;
  • the frequency space stream utilization of the channel is the ratio of the spatial stream actually occupied by the channel transmission data and the maximum spatial stream that the access point can provide.
  • the AP When the method of this embodiment is applied to a WIFI system, the AP generally allocates usable bandwidth in a minimum granularity unit of 20 MHz based on a specific hardware implementation, so that channels within the usable bandwidth may include: a primary 20 MHz channel, a secondary 20 MHz channel. , a secondary 40 MHz channel and a secondary 80 MHz channel.
  • the channel indicated by each 20 MHz channel in this embodiment includes: a primary 20 MHz channel, a secondary 20 MHz channel, two 20 MHz channels in the secondary 40 MHz channel (specifically including a primary 20 MHz channel and a secondary 20 MHz channel), and a sub-80 MHz channel.
  • the four 20 MHz channels (specifically include: a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in a secondary 40 MHz channel within the secondary 80 MHz channel).
  • the maximum spatial stream is the maximum number of spatial streams that the transmitting antenna and the receiving antenna can distinguish, and is the minimum of the total number of transmitting antennas and the total number of receiving antennas. Since the protocol generally specifies the maximum spatial stream that can be supported according to the number of antennas of the AP, the maximum spatial stream in this example can be defined as: the maximum spatial stream that the antenna of the AP can distinguish.
  • Step 102 Add indication information indicating the frequency space flow utilization to a load information element (BSS load element);
  • the BSS load element generally carries frequency space stream utilization: frequency space stream utilization of the secondary 20 MHz channel, frequency space stream utilization of the secondary 40 MHz channel, and frequency space stream utilization of the secondary 80 MHz channel.
  • the solution provided by the embodiment of the present invention further measures and indicates a channel with a bandwidth exceeding 20 MHz based on the originally utilized frequency space stream utilization rate, and performs frequency space flow of each 20 MHz channel in a channel with a bandwidth exceeding 20 MHz. Utilization is indicated.
  • the preset domain in order to carry the indication information, the preset domain may be added in advance in the BSS load element, and then when the indication information is needed, the obtained indication information may be directly added to the preset domain.
  • Step 103 Send the load information element to a station (STA).
  • the frequency space stream utilization rate of each unit bandwidth channel (for example, a 20 MHz channel) in the bandwidth may be determined according to the indication information.
  • the frequency space stream utilization parameter provided to the STA is more detailed than the prior art solution, so after determining the frequency space stream utilization rate of each 20 MHz channel, the STA may determine The resources available to determine the APs that need to be accessed. Therefore, the load between the APs is balanced, so that the resource allocation is more reasonable.
  • the number of access STAs in the first BSS (corresponding to the area 1 in FIG. 2) is significantly larger than that in the second BSS (corresponding to the area 2 in FIG. 2).
  • the load of a BSS is higher than that of the second BSS, if the load indication scheme of the prior art is adopted, the site cannot determine the actual utilization of the resources of the BSS, so the AP cannot be properly interposed, so that the BSS caused by the high load causes the STA to wait for the resource to be delayed.
  • the resources of the adjacent low-load BSS are not fully utilized.
  • the load information sent by the AP to the STA includes the AP.
  • the frequency space flow utilization of each unit bandwidth channel in the bandwidth can be used.
  • the STA can according to the refined load information (the frequency space flow of each unit bandwidth channel within the AP usable bandwidth)
  • the utilization rate is selected to be accessed in the second BSS, so that the problem of imbalance between the two BSS loads can be effectively alleviated, and the resource utilization rate is effectively improved.
  • the unit bandwidth can be set to a reasonable value according to specific requirements.
  • the unit bandwidth channel that meets the hardware implementation requirements is 20 MHz.
  • the following provides a description of the solution provided by the embodiment of the present invention by taking a unit bandwidth channel as a 20 MHz channel as an example:
  • the frequency space flow utilization rate of each 20 MHz channel in the available bandwidth of the AP may be indicated in different manners.
  • the following provides several optimized implementation manners, including:
  • the unit bandwidth channel is a 20 MHz channel
  • the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel
  • the indication information includes:
  • the stream utilization is the linear arithmetic mean of the frequency space flow utilization of the two 20 MHz channels in the sub 40 MHz channel;
  • the average frequency spatial stream utilization is the linear arithmetic mean of the frequency spatial stream utilization of the four 20 MHz channels in the secondary 80 MHz channel.
  • the specific implementation can be:
  • the preset domain is set in the BSS load element defined by the 802.11ax system for carrying information indicating the frequency space stream utilization of each 20 MHz channel (the specific structure of the BSS load element for implementing the example scheme is shown in Table 3). As shown), each domain in the BSS Load Element is defined as:
  • Element ID used to indicate that the media access control frame (MAC frame) is a BSS load element MAC frame;
  • Length indicates the length of the BSS load element MAC frame
  • OFDMA/MU-MIMO capable STA count (corresponding to STA count in Table 3): used to indicate the number of users supporting receiving 801.111ax OFDMA/MU-MIMO in the BSS;
  • Freq/Spatial utilization over primary CH (corresponding to primary CH in Table 3): used to indicate the frequency space utilization of the primary 20 MHz channel (primary 20 MHz-channel);
  • Freq/Spatial utilization over secondary 20MHz CH (corresponding to secondary 20MHz CH in Table 3): used to indicate the frequency space utilization of the secondary 20MHz channel (primary 20MHz-channel);
  • Freq/Spatial utilization over secondary 40MHz CH (corresponding to the secondary 40MHz CH in Table 3): used to indicate the frequency space utilization of the secondary 40MHz channel (primary 20MHz-channel); wherein the secondary 40MHz channel average frequency space stream utilization is The linear arithmetic mean of the frequency space flow utilization of two 20 MHz channels in the sub-40 MHz channel;
  • Freq/Spatial utilization over secondary 80MHz CH (corresponding to secondary in Table 3) 80MHz CH): used to indicate the frequency space stream utilization of the secondary 80MHz channel (primary 20MHz-channel); wherein the average frequency space stream utilization of the secondary 80MHz channel is the frequency space stream of four 20MHz channels in the sub-80MHz channel Average of the linear arithmetic of utilization;
  • Utilization offset over each 20MHz in secondary 40MHz (corresponding to 20MHz in secondary 40MHz in Table 3): used to indicate the difference between the frequency space stream utilization of each 20MHz channel in the secondary 40MHz channel relative to the average utilization of the secondary 40MHz channel;
  • the difference of each 20 MHz channel can be represented by 4 bits, and the two 20 MHz channels within the sub 40 MHz, and the difference indication can be represented by 8 bits (1 byte) in total;
  • Utilization offset over each 20MHz in secondary 80Hz (corresponding to 20MHz in secondary 80Hz in Table 3): used to indicate the difference in frequency space stream utilization of each 20MHz channel in the secondary 80MHz channel with respect to the secondary 80MHz channel average utilization;
  • the difference in the sub-80 MHz channel indicates that the granularity is increased, and the difference between each 20 MHz channel can be 2 bits, and the difference of 4 channels is 8 bits in total (1 byte);
  • the frequency space stream utilization ratio in the example is an average value, which may be: calculating the frequency space flow utilization average of the bandwidth channel by using N ss flow numbers on the ⁇ RU s, j ⁇ in the bandwidth channel.
  • the calculation formula can be:
  • N maxSS is the maximum number of streams per resource unit (RU) (for example: 8 streams in the case of 8 antennas)
  • N RU is the number of resource blocks on the specified channel
  • N ss, s, j, i is in the first
  • the number of Nss streams used on the jth RU in the sth time sub-segment within the iCCA busy time period T i , RU s,j is the sth time sub-segment inner j-th RU
  • T busy It is the length of the CCA busy time (or called: T busy is the length of time that the channel is busy according to the Clear Channel Assessment (CCA)).
  • CCA Clear Channel Assessment
  • the difference can be the difference obtained by subtraction, such as:
  • the frequency utilization difference of each 20 MHz channel in the sub-40 MHz is the absolute difference of the frequency space stream utilization of each 20 MHz channel minus the average frequency space stream utilization of the sub 40 MHz channel; each 20 MHz channel in the sub-80 MHz
  • the difference in frequency utilization is the absolute difference between the frequency space stream utilization of the 20 MHz channel minus the average frequency space stream utilization of the secondary 80 MHz channel.
  • the magnitude of the absolute value difference may be indicated according to a predetermined granularity, for example, expressed in units of 0.0625, and the 4-bit difference indication range is [-0.5, 0.5). If expressed in terms of a large granularity of 0.125, the 2-bit difference indication range is also [-0.5, 0.5), but the accuracy is halved.
  • the difference can also be the difference in the ratio obtained by dividing, for example:
  • the frequency utilization difference of each 20MHz channel in the sub-40MHz is the ratio of the frequency space stream utilization of the 20MHz channel divided by the average frequency space stream utilization of the sub-40MHz channel; the frequency of each 20MHz channel in the sub-80MHz
  • the utilization difference is the ratio of the frequency space stream utilization of the 20 MHz channel divided by the average frequency space stream utilization of the sub 80 MHz channel.
  • the size of the proportional difference may be indicated according to a predetermined granularity, for example, a multiple of the reference value is expressed by a unit size of 1.25 times, and a unit size of 1/1.25 times is a multiple of the reference value, and the difference ratio of the 4 bits is The indication range is [0.1, 10) times. If the unit size is 1.5 times larger than the reference value, and 1/1.5 times the unit size indicates a multiple smaller than the reference value, the 2-bit ratio difference indication range is also [0.1, 10) times. Only the accuracy is halved.
  • the unit bandwidth channel is a 20 MHz channel
  • the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel
  • the indication information includes:
  • the frequency space stream utilization of each 20 MHz channel in the secondary 80 MHz channel is the difference from the frequency space stream utilization of the primary 20 MHz channel, the secondary 20 MHz channel, and the two 20 MHz channels in the secondary 40 MHz channel, respectively.
  • the format of the BSS Load Element may be the format shown in Table 4, wherein the left-to-right domain is similar to the 802.11ac BSS Load Element.
  • Each of these fields is defined as:
  • Element ID used to indicate that the MAC frame is a BSS load element MAC frame
  • Length indicates the length of the BSS load element MAC frame
  • OFDMA/MU-MIMO capable STA count used to indicate the number of users supporting receiving 801.111ax OFDMA/MU-MIMO in the BSS;
  • Freq/Spatial utilization over primary CH used to indicate the frequency space utilization of the primary 20 MHz channel (primary 20 MHz-channel);
  • Freq/Spatial utilization over secondary 20MHz CH used to indicate the frequency space utilization of the secondary 20MHz channel (primary 20MHz-channel);
  • Utilization offset over each 20MHz in secondary 40MHz used to indicate the difference in frequency space stream utilization of each 20MHz channel in the secondary 40MHz channel with respect to the frequency space stream utilization of the primary 20MHz channel and the secondary 20MHz channel (sub 40MHz
  • the frequency space stream utilization rate of the 20 MHz channel in the channel is one-to-one corresponding to the frequency space stream utilization ratio of the primary 20 MHz channel and the secondary 20 MHz channel to obtain the difference; the difference of each 20 MHz channel is represented by 4 bits; a total of 8 bits (1byte).
  • the frequency space stream utilization rate of each 20 MHz channel in the sub 40 MHz channel (including two 20 MHz channels in the sub 40 MHz channel, the sub 40 MHz_1 and the sub 40 MHz_2) is utilized with respect to the frequency space stream of the primary 20 MHz channel and the secondary 20 MHz channel.
  • the calculation method of the difference of the rate (the sub-40MHz_1 corresponds to the difference 1 and the sub-40MHz_2 corresponds to the difference 2) can be:
  • Sub 40MHz_1 - primary 20MHz channel difference 1;
  • Utilization offset over each 20MHz in secondary 80Hz frequency space stream utilization of each 20MHz channel in the secondary 80MHz channel and frequency space stream utilization of the main 20MHz channel, the secondary 20MHz channel, and the two 20MHz channels in the secondary 40MHz channel.
  • the difference (the frequency spatial stream utilization of the four 20 MHz channels in the sub-80 MHz channel is one-to-one corresponding to the frequency space flow utilization ratio of the two 20 MHz channels in the primary 20 MHz channel, the secondary 20 MHz channel, and the secondary 40 MHz channel.
  • the difference of each 20 MHz channel is represented by 4 bits, and the 80 MHz channel includes 4 20 MHz channels for a total of 16 bits (2 bytes).
  • the difference in the sub-80 MHz large bandwidth indicates that the granularity is increased, and the difference between each 20 MHz channel can be 2 bits, respectively.
  • the difference of 4 channels is a total of 8 bits (1 byte).
  • the frequency space utilization of each 20MHz channel is respectively the main 20MH channel, the sub-20MHz channel, and the sub-40MHz.
  • the difference between the frequency space stream utilization ratios of the two 20 MHz channels in the channel (the sub-80 MHz_1 corresponds to the difference value 1, the sub-80 MHz_2 corresponds to the difference 2, the sub-80 MHz_3 corresponds to the difference 3, and the sub-80 MHz_4 corresponds to the difference 4). :
  • Sub 80MHz_2 - sub 20MHz channel difference 2;
  • Sub 80MHz_3 - sub 40MHz_1 channel difference 3;
  • Sub 80MHz_4 - Sub 40MHz_2 channel difference 4.
  • the frequency space stream utilization ratio in the example is an average value, which may be: calculating the frequency space flow utilization average of the bandwidth channel by using N ss flow numbers on the ⁇ RU s, j ⁇ in the bandwidth channel.
  • the calculation formula can be:
  • N maxSS is the maximum number of streams per resource unit (RU)
  • N RU is the number of resource blocks on the specified channel
  • N ss, s, j, i is the number in the i-th CCA busy period T i
  • the number of Nss streams utilized in the jth RU in the s time subsegment, RU s, j is the jth RU in the sth time subsegment
  • T busy is the CCA busy time length.
  • the difference can be the difference obtained by subtraction, such as:
  • the utilization on the two 20 MHz channels in the sub-40 MHz channel bandwidth minus the frequency space stream utilization of the primary 20 MHz channel and the secondary 20 MHz channel respectively obtains the absolute value difference (frequency space stream utilization of the 20 MHz channel in the sub 40 MHz channel and the main 20 MHz)
  • the frequency space flow utilization ratio of the channel and the secondary 20 MHz channel is one-to-one corresponding to the difference to obtain the difference).
  • the utilization of four 20MHz channels in the sub-80MHz channel bandwidth is subtracted from the main 20MHz channel, the secondary 20MHz channel, and the utilization of the two 20MHz channels in the sub-40MHz channel is the absolute difference (four 20MHz channels in the sub-80MHz channel).
  • the frequency space stream utilization is compared with the frequency space stream utilization ratio of the two 20 MHz channels in the primary 20 MHz channel, the secondary 20 MHz channel, and the secondary 40 MHz channel to obtain the difference). Then, the magnitude of the absolute value difference is indicated according to a predetermined granularity, for example, expressed in units of 0.0625, and the 4-bit difference indication range is [-0.5, 0.5). If expressed in terms of a large granularity of 0.125, the 2-bit difference indication range is also [-0.5, 0.5), but the accuracy is halved.
  • the difference can also be the difference in the ratio obtained by dividing, for example:
  • the ratio of the utilization on the two 20 MHz channels in the sub-40 MHz channel bandwidth divided by the frequency space stream utilization of the primary 20 MHz channel and the secondary 20 MHz channel is obtained (the frequency space utilization of the 20 MHz channel in the sub 40 MHz channel is The frequency of the main 20MHz channel and the frequency of the secondary 20MHz channel is one-to-one corresponding to the difference, and the utilization of the four 20MHz channels in the sub-80MHz channel bandwidth is divided by the main 20MHz channel, the secondary 20MHz channel, and the vice.
  • Proportion of the utilization of two 20MHz channels in a 40MHz channel (frequency spatial stream utilization of four 20MHz channels in a sub-80MHz channel and frequency space flow of two 20MHz channels in a primary 20MHz channel, a secondary 20MHz channel, and a secondary 40MHz channel)
  • the utilization ratio is one-to-one corresponding to the difference to obtain the difference).
  • the size of the proportional difference is indicated. For example, the granularity of 1.25 times represents a multiple larger than the reference value, and 1/1.25 times the unit granularity represents a multiple smaller than the reference value, then 4
  • the bit scale difference indication range is [0.1, 10) times. If the unit size is 1.5 times larger than the reference value, and 1/1.5 times the unit size indicates a multiple smaller than the reference value, the 2-bit ratio difference indication range is also [0.1, 10) times. Only the accuracy is halved.
  • the indeterminate channel may be set as the set bandwidth channel, and the indication information may be:
  • the total frequency space stream utilization is a linear arithmetic mean of frequency space flow utilization of at least one 20 MHz channel in the set bandwidth channel;
  • the difference is 0;
  • the difference includes a difference between a main 20 MHz channel and a secondary 20 MHz channel of the 40 MHz channel and an average frequency space stream utilization ratio of the 40 MHz channel; the 40 MHz channel
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space stream utilization of the primary 20 MHz channel and the frequency space stream utilization of the secondary 20 MHz channel in the 40 MHz channel;
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the 80 MHz channel and the 80 MHz channel respectively.
  • the average frequency space flow utilization is the difference obtained by the difference; the average frequency spatial stream utilization of the 80 MHz channel is the linear arithmetic mean of the frequency space flow utilization of the four 20 MHz channels in the 80 MHz channel.
  • the format of the BSS Load Element can be set to the format shown in Table 5, wherein the left-to-right domain is similar to the BSS Load Element in 802.11ac.
  • the domains are defined as:
  • Element ID used to indicate that the MAC frame is a BSS load element MAC frame
  • Length indicates the length of the BSS load element MAC frame
  • OFDMA/MU-MIMO capable STA count used to indicate the number of users supporting receiving 801.111ax OFDMA/MU-MIMO in the BSS;
  • Average Freq/Spatial utilization over BW used to indicate the average frequency space stream utilization of the set bandwidth channel, wherein the average frequency space stream utilization is the frequency space stream utilization rate of at least one 20 MHz channel in the set bandwidth channel. Average of the linear arithmetic;
  • Utilization offset over each 20MHz within BW used to indicate the difference between the frequency space stream utilization of each 20 MHz channel in the set bandwidth channel relative to the total frequency space stream utilization;
  • the difference is 0; the difference may not be indicated, and the overhead is 0 bits;
  • the difference includes a difference between a main 20 MHz channel and a secondary 20 MHz channel of the 40 MHz channel and an average frequency space stream utilization ratio of the 40 MHz channel; the 40 MHz channel
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space stream utilization of the main 20 MHz channel and the frequency space stream utilization of the secondary 20 MHz channel in the 40 MHz channel; the main 20 MHz channel and the secondary 20 MHz channel are respectively represented by 4 bits.
  • the bandwidth is 80 MHz, the primary 20 MHz channel, and the secondary 20 MHz channel, and the secondary 40 MHz channel are included; the difference includes the primary 20 MHz channel, the secondary 20 MHz channel, and the secondary 40 MHz channel in the secondary 80 MHz channel.
  • the bandwidth is 160MHz, including the main 20MHz channel, and the secondary 20MHz channel, the secondary 40MHz channel, and the secondary 80MHz channel
  • there are 8 20MHz channels and the difference between the 8 20MHz channels and the average of all channels is represented by 4 bits.
  • the value then a total of 32 bits (4 bytes).
  • the difference of each 20 MHz channel can be represented by 2 bits for 8 channels, for a total of 16 bits (2 bytes).
  • the frequency space flow utilization is passed through a formula
  • N maxSS is the maximum number of streams per resource unit (RU)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is in the i-th CCA busy period T
  • the number of N ss streams used in the jth RU in the sth time sub-segment in i, RU s, j is the j-th RU in the s-th time sub-segment
  • T busy is the CCA busy time length.
  • the frequency space stream utilization of the 20 MHz channel in the set bandwidth channel is reflected by the difference.
  • the following may be:
  • the difference value may also be a proportional difference obtained by dividing, and then indicating the magnitude of the proportional difference according to a predetermined granularity, for example, a 1.25-times unit size indicates a multiple greater than the reference value, and 1/1.25 times is a unit granularity representation. Less than a multiple of the reference value, then the 4-bit proportional difference indication range is [0.1, 10) times. If the unit size is 1.5 times larger than the reference value, and 1/1.5 times the unit size indicates a multiple smaller than the reference value, the 2-bit ratio difference indication range is also [0.1, 10) times. Only the accuracy is halved.
  • an embodiment of the present invention further provides another method for receiving load information, where the method includes:
  • Step 301 A station (STA) receives a load information element (BSS load element) sent by an access point (AP);
  • STA receives a load information element (BSS load element) sent by an access point (AP);
  • Step 302 The STA acquires, from the load information element, indication information indicating a frequency space flow utilization, where the frequency space flow utilization includes frequency space flow utilization of each unit bandwidth channel in the available bandwidth of the AP. Rate, and the frequency space stream utilization ratio is a ratio of a spatial resource block allocated by the frequency resource block allocated on the unit bandwidth channel for transmitting a data to a maximum spatial stream supported by an antenna of the AP;
  • the AP When the method of this embodiment is applied to a WIFI system, the AP generally allocates usable bandwidth in a minimum granularity unit of 20 MHz based on a specific hardware implementation, so that channels within the usable bandwidth may include: a primary 20 MHz channel, a secondary 20 MHz channel. , a secondary 40 MHz channel and a secondary 80 MHz channel.
  • the channel indicated by each 20 MHz channel in this embodiment includes: a primary 20 MHz channel, a secondary 20 MHz channel, two 20 MHz channels in the secondary 40 MHz channel (specifically including a primary 20 MHz channel and a secondary 20 MHz channel), and a sub-80 MHz channel. 4 20MHz channels (specifically: main 20MHz Channel, secondary 20 MHz channel and two 20 MHz channels included in the secondary 40 MHz channel within the secondary 80 MHz channel).
  • Step 303 The STA determines, according to the frequency space flow utilization rate, an AP that needs to be accessed.
  • the STA may obtain the frequency space flow utilization rate from the preset domain of the BSS load element in a corresponding manner, and obtain the STA by using the solution provided in the second embodiment.
  • the method of frequency space flow utilization is described in detail:
  • the STA determines, according to the Element ID, that the received frame is a BSS load element MAC frame
  • the Freq/Spatial utilization over secondary 20 MHz CH, the Freq/Spatial utilization over secondary 40 MHz CH, the Freq/Spatial utilization over secondary 80 MHz CH, the Utilization offset over each 20 MHz in the secondary 40 MHz, and the Utilization offset over each 20 MHz in the secondary 80 Hz are obtained.
  • the parameter value, and the spatial stream utilization rate of each 20 MHz channel frequency is parsed from the parameter value according to the manner in which the previously known AP side indicates the spatial stream utilization rate of each 20 MHz channel frequency.
  • the indication information in the embodiment of the present invention may be implemented by using the following examples, including:
  • the indication information includes: when the unit bandwidth channel is a 20 MHz channel, and the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel, where the indication information includes:
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • the average frequency spatial stream utilization is the linear arithmetic mean of the frequency spatial stream utilization of the four 20 MHz channels in the secondary 80 MHz channel.
  • the indication information includes: when the unit bandwidth channel is a 20 MHz channel, and the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel, where the indication information includes:
  • the frequency space stream utilization of each 20 MHz channel in the secondary 80 MHz channel is the difference from the frequency space stream utilization of the primary 20 MHz channel, the secondary 20 MHz channel, and the two 20 MHz channels in the secondary 40 MHz channel, respectively.
  • the indication information includes: when the unit bandwidth channel is a 20 MHz channel, and the available bandwidth includes a primary 20 MHz channel and a set bandwidth channel, where the indication information includes:
  • the difference is 0;
  • the difference includes the 40 MHz channel
  • the average frequency space utilization of the 40MHz channel is the frequency space stream utilization of the main 20MHz channel in the 40MHz channel
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • the average frequency space utilization of the channel is the difference obtained by the difference;
  • the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel.
  • the specific calculation of the frequency space flow utilization rate can be calculated by a formula
  • N maxSS is the maximum number of streams per resource unit (RU)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is in the i-th CCA busy period T
  • the number of Nss streams used in the jth RU in the sth time subsegment in i, RU s, j is the jth RU in the sth time subsegment
  • T busy is the CCA busy time length.
  • an embodiment of the present invention provides an access point, where the access point 400 includes:
  • a measurement module 401 configured to measure a frequency space stream utilization rate of each unit bandwidth channel within a usable bandwidth of the AP within a set time range, where the frequency space stream utilization rate is allocated on the unit bandwidth channel The ratio of the spatial resource block used by the frequency resource block to the maximum spatial stream supported by the antenna of the AP;
  • the measurement module 401 is also used to pass a formula
  • N maxSS is the maximum number of streams per resource unit (RU)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is at The number of Nss streams used in the jth RU in the sth time sub-segment in i CCA busy period T i
  • RU s, j is the jth RU in the sth time sub-segment
  • T busy Is the length of the CCA busy time.
  • the adding module 402 is configured to add indication information indicating the frequency space flow utilization to the load information element;
  • the sending module 403 is configured to send the load information element to the station STA.
  • the AP When the method of this embodiment is applied to a WIFI system, the AP generally allocates usable bandwidth in a minimum granularity unit of 20 MHz based on a specific hardware implementation, so that channels within the usable bandwidth may include: a primary 20 MHz channel, a secondary 20 MHz channel. , a secondary 40 MHz channel and a secondary 80 MHz channel.
  • the channel indicated by each 20 MHz channel in this embodiment includes: a primary 20 MHz channel, a secondary 20 MHz channel, two 20 MHz channels in the secondary 40 MHz channel (specifically including a primary 20 MHz channel and a secondary 20 MHz channel), and a sub-80 MHz channel.
  • the four 20 MHz channels (specifically include: a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in a secondary 40 MHz channel within the secondary 80 MHz channel).
  • the frequency space flow utilization rate of each 20 MHz channel in the available bandwidth of the AP may be indicated in different manners.
  • the following provides several optimized implementation manners, including:
  • the adding module is specifically configured to: the primary 20 MHz channel Frequency space stream utilization and secondary 20MHz letter Frequency space flow utilization of the channel;
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space flow utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • the indication information is added to the load information element.
  • the adding module is specifically configured to: the primary 20 MHz channel Frequency space stream utilization and frequency space stream utilization of the secondary 20 MHz channel;
  • the indication information is added to the load information element.
  • the adding module is specifically configured to: the frequency space of the primary 20 MHz channel in the usable bandwidth Flow utilization rate
  • the total frequency space stream utilization rate of the set bandwidth channel wherein the total frequency space stream utilization rate a linear arithmetic mean value of frequency space flow utilization of at least one 20 MHz channel within the set bandwidth channel;
  • the difference is 0;
  • the difference includes a difference between a main 20 MHz channel and a secondary 20 MHz channel of the 40 MHz channel and an average frequency space stream utilization ratio of the 40 MHz channel; the 40 MHz channel
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space stream utilization of the primary 20 MHz channel and the frequency space stream utilization of the secondary 20 MHz channel in the 40 MHz channel;
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • the difference between the average frequency and spatial stream utilization of the channel is the difference;
  • the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • the indication information is added to the load information element.
  • an embodiment of the present invention further provides a site, where the site 500 includes:
  • the receiving module 501 is configured to receive a load information element sent by the access point AP.
  • the indication information obtaining module 502 is configured to obtain, from the load information element, indication information indicating a frequency space stream utilization rate, where the frequency space stream utilization rate includes a frequency space of each unit bandwidth channel in the available bandwidth of the AP.
  • Flow utilization rate, and the frequency space stream utilization ratio is a ratio of a spatial resource block allocated by the frequency resource block allocated on the unit bandwidth channel for transmitting data to a maximum spatial stream supported by an antenna of the AP;
  • the selecting module 503 is configured to determine, according to the frequency space flow utilization rate, an AP that needs to be accessed.
  • the AP When the method of this embodiment is applied to a WIFI system, the AP generally allocates usable bandwidth in a minimum granularity unit of 20 MHz based on a specific hardware implementation, so that channels within the usable bandwidth may include: a primary 20 MHz channel, a secondary 20 MHz channel. , a secondary 40 MHz channel and a secondary 80 MHz channel.
  • the channel indicated by each 20 MHz channel in this embodiment includes: a primary 20 MHz channel, a secondary 20 MHz channel, two 20 MHz channels in the secondary 40 MHz channel (specifically including a primary 20 MHz channel and a secondary 20 MHz channel), and a sub-80 MHz channel.
  • the four 20 MHz channels (specifically include: a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in a secondary 40 MHz channel within the secondary 80 MHz channel).
  • the frequency space flow utilization rate of each 20 MHz channel in the available bandwidth of the AP may be indicated in different manners, and the indication information in this embodiment is different according to the format of the frequency space flow utilization rate of the access point transmission frequency.
  • the obtaining module can obtain the indication information in several ways, including:
  • the indication information acquiring module is specifically configured to use the load information. Acquisition of elements: frequency space stream utilization of the primary 20 MHz channel and frequency space stream utilization of the secondary 20 MHz channel;
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • the average frequency space stream utilization is the pair of 80MHz letters
  • the indication information acquisition module is specifically configured to use the load information, when the unit bandwidth channel is a 20 MHz channel, and the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel.
  • the indication information acquiring module is specifically configured to obtain from the load information element:
  • the total frequency space stream utilization rate is a linear arithmetic mean value of frequency space flow utilization of at least one 20 MHz channel in the set bandwidth channel;
  • the difference is 0;
  • the difference includes the 40 MHz channel
  • the average frequency space utilization of the 40MHz channel is the frequency space stream utilization of the main 20MHz channel in the 40MHz channel
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • the difference between the average frequency and spatial stream utilization of the channel is the difference;
  • the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • N maxSS is the maximum number of flows per resource unit (RU)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is within the i-th CCA busy time period T i
  • the number of Nss streams utilized in the jth RU in the sth time subsegment, RU s, j is the jth RU in the sth time subsegment
  • T busy is the CCA busy time length.
  • an embodiment of the present invention provides an access point, where the access point 600 includes:
  • the processor 601 is configured to measure a frequency space stream utilization rate of each unit bandwidth channel in the available bandwidth of the AP in a set time range, where the frequency space stream utilization is allocated on the unit bandwidth channel a ratio of a spatial resource block used to transmit data to a maximum spatial stream supported by an antenna of the AP; and an indication indicating the utilization of the frequency space stream Add to the load information element;
  • the processor 601 is also used to pass a formula
  • N maxSS is the maximum number of streams per resource unit (RU)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is at The number of Nss streams used in the jth RU in the sth time sub-segment in i CCA busy period T i
  • RU s, j is the jth RU in the sth time sub-segment
  • T busy Is the length of the CCA busy time.
  • the transceiver 602 is configured to send the load information element to the station STA.
  • the AP When the method of this embodiment is applied to a WIFI system, the AP generally allocates usable bandwidth in a minimum granularity unit of 20 MHz based on a specific hardware implementation, so that channels within the usable bandwidth may include: a primary 20 MHz channel, a secondary 20 MHz channel. , a secondary 40 MHz channel and a secondary 80 MHz channel.
  • the channel indicated by each 20 MHz channel in this embodiment includes: a primary 20 MHz channel, a secondary 20 MHz channel, two 20 MHz channels in the secondary 40 MHz channel (specifically including a primary 20 MHz channel and a secondary 20 MHz channel), and a sub-80 MHz channel.
  • the four 20 MHz channels (specifically include: a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in a secondary 40 MHz channel within the secondary 80 MHz channel).
  • the frequency space flow utilization rate of each 20 MHz channel in the available bandwidth of the AP may be indicated in different manners.
  • the following provides several optimized implementation manners, including:
  • the processor 601 is specifically configured to: the primary 20 MHz channel Frequency space stream utilization and sub-20MHz channel Frequency space flow utilization;
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space flow utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • the indication information is added to the load information element.
  • the processor 601 is specifically configured to: the main 20 MHz channel, when the unit bandwidth channel is a 20 MHz channel, and the available bandwidth includes a primary 20 MHz channel, a secondary 20 MHz channel, a secondary 40 MHz channel, and a secondary 80 MHz channel. Frequency space stream utilization and frequency space stream utilization of the secondary 20 MHz channel;
  • the indication information is added to the load information element.
  • the processor 601 is specifically configured to: frequency space flow of the primary 20 MHz channel in the usable bandwidth. Utilization rate
  • the total frequency space stream utilization rate of the set bandwidth channel wherein the total frequency space stream utilization rate a linear arithmetic mean value of frequency space flow utilization of at least one 20 MHz channel within the set bandwidth channel;
  • the difference is 0;
  • the difference includes a difference between a main 20 MHz channel and a secondary 20 MHz channel of the 40 MHz channel and an average frequency space stream utilization ratio of the 40 MHz channel; the 40 MHz channel
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space stream utilization of the primary 20 MHz channel and the frequency space stream utilization of the secondary 20 MHz channel in the 40 MHz channel;
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • the difference between the average frequency and spatial stream utilization of the channel is the difference;
  • the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • the indication information is added to the load information element.
  • an embodiment of the present invention further provides a site, where the site 700 includes:
  • the transceiver 701 is configured to receive a load information element sent by the access point AP.
  • the processor 702 is configured to obtain, from the load information element, indication information indicating a frequency space flow utilization, where the frequency space flow utilization includes frequency space flow utilization of each unit bandwidth channel in the available bandwidth of the AP.
  • Rate, and the frequency space stream utilization ratio is a ratio of a spatial resource block allocated by the frequency resource block allocated on the unit bandwidth channel for transmitting a data to a maximum spatial stream supported by an antenna of the AP;
  • the frequency space stream utilization rate determines the AP that needs to be accessed.
  • the AP When the method of this embodiment is applied to a WIFI system, the AP generally allocates usable bandwidth in a minimum granularity unit of 20 MHz based on a specific hardware implementation, so that channels within the usable bandwidth may include: a primary 20 MHz channel, a secondary 20 MHz channel. , a secondary 40 MHz channel and a secondary 80 MHz channel.
  • the channel indicated by each 20 MHz channel in this embodiment includes: a primary 20 MHz channel, a secondary 20 MHz channel, two 20 MHz channels in the secondary 40 MHz channel (specifically including a primary 20 MHz channel and a secondary 20 MHz channel), and a sub-80 MHz channel.
  • the four 20 MHz channels (specifically include: a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in a secondary 40 MHz channel within the secondary 80 MHz channel).
  • the frequency space stream utilization rate of each 20 MHz channel in the available bandwidth of the AP may be indicated in different manners, and the processor in this embodiment is different according to the form of the frequency space stream utilization rate of the access point transmission frequency.
  • the 702 can obtain the indication information by using the following methods, including:
  • the processor 702 is specifically configured to use the load information element. Obtaining: frequency space stream utilization of the primary 20 MHz channel and frequency space stream utilization of the secondary 20 MHz channel;
  • the frequency space stream utilization is a linear arithmetic mean value of frequency space flow utilization of two 20 MHz channels in the sub 40 MHz channel;
  • the average frequency space stream utilization is the linear arithmetic mean of the frequency space flow utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • the processor 702 is specifically configured to use the load information element. Get:
  • the processor 702 is specifically configured to obtain from the load information element:
  • the total frequency space stream utilization rate is a linear arithmetic mean value of frequency space flow utilization of at least one 20 MHz channel in the set bandwidth channel;
  • the difference is 0;
  • the difference includes fluency of the main 20 MHz channel and the secondary 20 MHz channel of the 40 MHz channel and the average frequency space of the 40 MHz channel, respectively.
  • the difference obtained by the difference is;
  • the average frequency spatial stream utilization of the 40 MHz channel is the linear arithmetic mean of the frequency space utilization of the main 20 MHz channel and the frequency space utilization of the secondary 20 MHz channel in the 40 MHz channel;
  • the difference includes a primary 20 MHz channel, a secondary 20 MHz channel, and two 20 MHz channels included in the secondary 40 MHz channel of the secondary 80 MHz channel and the secondary 80 MHz, respectively.
  • the difference between the average frequency and spatial stream utilization of the channel is the difference;
  • the average frequency spatial stream utilization of the secondary 80 MHz channel is the linear arithmetic mean of the frequency space utilization of the four 20 MHz channels in the secondary 80 MHz channel;
  • N maxSS is the maximum number of flows per resource unit (RU)
  • N RU is the number of resource blocks on the designated channel
  • N ss, s, j, i is within the i-th CCA busy time period T i
  • the number of Nss streams utilized in the jth RU in the sth time subsegment, RU s, j is the jth RU in the sth time subsegment
  • T busy is the CCA busy time length.
  • the load information sent by the AP to the STA includes the frequency space stream utilization rate of each 20 MHz channel, so after the station STA receives the frequency space stream utilization information, the space stream may be according to the frequency space flow.
  • the utilization information determines the frequency space stream utilization of each 20 MHz channel. Because the solution provided by the embodiment of the present invention The frequency space stream utilization parameter provided to the STA is more detailed than the prior art scheme.
  • the STA can determine the available resources, thereby determining that the connection needs to be performed. Into the AP. Thereby, the load between the APs is balanced, and the resource allocation is more reasonable.

Abstract

L'invention concerne un procédé et un appareil d'envoi d'informations de charge. Le procédé comprend : la mesure, par un point d'accès (AP), dans une plage de temps établie, d'un taux d'utilisation par un flux d'espace fréquentiel de chaque canal de largeur de bande d'unité dans une largeur de bande disponible de l'AP, ce taux d'utilisation par un flux d'espace fréquentiel étant un rapport entre un flux d'espace, occupé par un bloc de ressources fréquentielles attribué sur le canal de largeur de bande d'unité pour la transmission de données, et le flux d'espace maximal supporté par une antenne de l'AP ; l'ajout d'informations d'indication, indiquant le taux d'utilisation de flux d'espace fréquentiel, dans un élément d'information de charge ; et l'envoi de l'élément d'information de charge à une station (STA). A l'aide du procédé et de l'appareil de l'invention, la STA peut déterminer des ressources disponibles après avoir déterminé un taux d'utilisation par un flux d'espace fréquentiel de chaque canal de largeur de bande d'unité, et déterminer ensuite un AP auquel accéder, de manière à équilibrer une charge entre divers AP et rendre l'attribution de ressources plus raisonnable.
PCT/CN2015/085741 2015-07-31 2015-07-31 Procédé et appareil de transmission d'informations de charge WO2017020174A1 (fr)

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WO2021244503A1 (fr) * 2020-06-01 2021-12-09 Huawei Technologies Co., Ltd. Configuration de flux spatiaux et attribution d'unités de ressources

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