CN110831072B - MCS (modulation and coding scheme) selection method and system based on WLAN (wireless local area network) - Google Patents

MCS (modulation and coding scheme) selection method and system based on WLAN (wireless local area network) Download PDF

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CN110831072B
CN110831072B CN201911036072.0A CN201911036072A CN110831072B CN 110831072 B CN110831072 B CN 110831072B CN 201911036072 A CN201911036072 A CN 201911036072A CN 110831072 B CN110831072 B CN 110831072B
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mcs
snr
wlan
data
optimal
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CN110831072A (en
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李宛苡
吴昌强
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TP Link Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/22—Negotiating communication rate

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Abstract

The invention discloses a MCS selection method and system based on WLAN, wherein the method comprises the following steps: transmitting a CSI measurement request and a PPDU detection frame to a data receiving end so that the data receiving end feeds back a CSI report; wherein the CSI report includes an SNR value; and matching an available MCS list conforming to the protocol specification according to the SNR value and the preset protocol specification, and selecting the MCS with the highest level from the available MCS list as the optimal MCS of the current channel. The invention can combine the feedback of the information receiving end and the range specified by the protocol to rapidly judge the optional MCS range and the optimal MCS, thereby carrying out rate selection according to the real-time channel information; in addition, the invention can adjust the MCS in real time according to the channel state, and set a fixed period to update and adjust the MCS periodically, thereby effectively ensuring that the MCS selection can adapt to complex and changeable wireless channel conditions.

Description

MCS (modulation and coding scheme) selection method and system based on WLAN (wireless local area network)
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and a system for selecting MCS based on WLAN.
Background
In a wireless communication network, after a communication connection is established, a data transceiver needs to select a transmission rate, and rate adjustment is continuously performed during communication to achieve optimal network performance. The rate selection process involves an MCS selection algorithm.
Due to the strong time-variability of the channel of wireless communications, the data transmission rate typically needs to be adjusted in time to accommodate the channel variations. The protocol only specifies the available MCS levels (e.g., in the 802.11ac WLAN protocol, the MCS may be selected in the range of MCS 0-9 in VHT based protocol mode), but does not specify how to choose the appropriate MCS. In general, the selection of MCS is closely related to the quality of the current wireless environment. The data transmission rate can be well improved by using the high-level MCS, but the high requirement is also met on a wireless channel, and if the channel condition is not good, the demodulation failure of the data frame is easy to cause.
Most of the rate selection methods mentioned in the current large chip manufacturers or papers/patents are: the current MCS level is raised/lowered based on historical statistics such as average packet loss rate/duration of successful data transmission/number of retransmissions/statistics of block ack for a previous period of time, etc. The method only needs the probing and statistics of the transmitting end, does not need the feedback of the receiving end, and is simple in design, so that the method is widely used.
However, this method for adjusting the rate according to the statistical information of the transmitting end only lacks mutual negotiation and feedback of the data transmitting and receiving parties, and cannot make a judgment according to the real-time channel information, resulting in low efficiency and reliability of MCS selection.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a MCS selection method and system based on WLAN, which can utilize the mutual negotiation and feedback information of the data transceiver to carry out MCS selection, and can make judgment according to real-time channel information, thereby improving the efficiency and reliability of MCS selection.
In order to solve the above technical problems, an embodiment of the present invention provides a MCS selection method based on WLAN, including:
transmitting a CSI measurement request and a PPDU detection frame to a data receiving end, so that the data receiving end carries out CSI calculation and feeds back a CSI report according to the CSI measurement request and the PPDU detection frame; wherein the CSI report includes an SNR value;
and matching an available MCS list conforming to the protocol specification according to the SNR value and the preset protocol specification, and selecting the MCS with the highest level from the available MCS list as the optimal MCS of the current channel.
Further, the MCS selection method based on the WLAN further includes:
and when the fact that the current optimal MCS is not matched with the channel state is detected, adjusting the optimal MCS.
Further, the method for judging that the current optimal MCS is not matched with the channel state comprises the following steps:
dividing the SNR report value of the current channel into N judgment sections, and determining adjustment thresholds corresponding to the judgment sections; wherein, N is a positive integer, and the adjustment threshold comprises a preset continuous retransmission threshold of the data packet and a preset packet loss rate threshold;
acquiring channel state information of a current channel; the channel state information comprises the continuous retransmission times and the packet loss rate of the data packet;
determining a target judgment section in which the SNR value is located, and comparing the channel state information with an adjustment threshold value of the target judgment section;
and when the number of continuous retransmission times of the data packet exceeds the continuous retransmission threshold of the data packet and the packet loss rate exceeds the packet loss rate threshold, judging that the current optimal MCS is not matched with the channel state.
Further, the adjusting the optimal MCS specifically includes:
and selecting the highest level MCS left except the current optimal MCS from the available MCS list, and setting the highest level MCS as a new optimal MCS.
Further, the MCS selection method based on the WLAN further includes:
and re-requesting the data receiving end to feed back the CSI report at intervals of a preset fixed period, re-matching an available MCS list according to the latest acquired SNR value, and re-selecting the optimal MCS.
In order to solve the same technical problem, another aspect of the present invention further provides a MCS selection method based on WLAN, including:
receiving a CSI measurement request and a PPDU detection frame sent by the data sending end;
and carrying out CSI calculation according to the CSI measurement request and the PPDU detection frame, and feeding back a CSI report to the data transmitting end, so that the data transmitting end matches an available MCS list conforming to the protocol specification according to an SNR value in the CSI report and a preset protocol specification, and selects the MCS with the highest level from the available MCS list as the optimal MCS of the current channel.
Further, the MCS selection method based on the WLAN further includes:
and calculating the SNR floating value of the channel in real time, and when the SNR floating value is monitored to exceed a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding back to the data transmitting end so that the data transmitting end can re-match the available MCS list and re-select the optimal MCS according to the latest SNR value.
In order to solve the same technical problem, a further aspect of the present invention also provides a MCS selection system based on WLAN, including a data transmitting end and a data receiving end; wherein,
the data transmitting end is used for transmitting a CSI measurement request and a PPDU detection frame to the data receiving end;
the data receiving end is used for carrying out CSI calculation according to the CSI measurement request and the PPDU detection frame and feeding back a CSI report to the data sending end; wherein the CSI report includes an SNR value;
the data transmitting end is further configured to match an available MCS list according to the SNR value and a preset protocol rule, and select an MCS with a highest level from the available MCS list as an optimal MCS of a current channel.
Further, the data transmitting end is further configured to: and when the fact that the current optimal MCS is not matched with the channel state is detected, adjusting the optimal MCS.
Further, the data receiving end is further configured to: and calculating the SNR floating value of the channel in real time, and when the SNR floating value is monitored to exceed a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding back to the data transmitting end so that the data transmitting end can re-match the available MCS list and re-select the optimal MCS according to the latest SNR value.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a MCS selection method and system based on WLAN, wherein the method comprises the following steps: transmitting a CSI measurement request and a PPDU detection frame to a data receiving end, so that the data receiving end carries out CSI calculation and feeds back a CSI report according to the CSI measurement request and the PPDU detection frame; wherein the CSI report includes an SNR value; and matching an available MCS list conforming to the protocol specification according to the SNR value and the preset protocol specification, and selecting the MCS with the highest level from the available MCS list as the optimal MCS of the current channel. The invention can combine the feedback of the information receiving end and the range specified by the protocol to rapidly judge the optional MCS range and the optimal MCS, thereby carrying out rate selection according to the real-time channel information and effectively improving the efficiency and reliability of MCS selection; in addition, the invention can adjust the MCS in real time according to the channel state, and set a fixed period to update and adjust the MCS periodically, thereby effectively ensuring that the MCS selection can adapt to complex and changeable wireless channel conditions.
Drawings
Fig. 1 is a flowchart of a WLAN-based MCS selection method provided in embodiment 1 of the present invention;
fig. 2 is a flowchart of a WLAN-based MCS selection method provided in embodiment 2 of the present invention;
fig. 3 is a flowchart illustrating steps S140-S150 in the WLAN-based MCS selection method provided in embodiment 3 of the present invention;
fig. 4 is a flowchart of a WLAN-based MCS selection method provided in embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of a MCS selection system based on WLAN according to embodiment 5 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention selects the MCS (Modulation and Coding Scheme, modulation and coding strategy) as the whole idea: the SNR (Signal-Noise-Ratio) value of the current communication link is acquired first, and then, in combination with the protocol specification, the optimal MCS value within the specified range is selected.
Example 1:
referring to fig. 1, the embodiment of the invention provides a MCS selecting method based on WLAN, which includes the steps of:
s110, sending a CSI measurement request and a PPDU detection frame to a data receiving end, so that the data receiving end carries out CSI calculation and feeds back a CSI report according to the CSI measurement request and the PPDU detection frame; wherein the CSI report includes an SNR value.
In step S110, the data transmitting end needs to acquire the SNR value of the link according to the feedback of the information receiving end.
When an STA (connected to a terminal in a wireless network) wants to know the SNR value of a current channel, it may send a CSI (Channel State Information ) detection request to an opposite STA, and send a sounding PPDU, and the data receiving end may perform CSI calculation according to the preamble information of the sounding PPDU, the long and short training sequences, the subcarrier actual transmit power and the subcarrier actual receive power negotiated by the transmitting and receiving end, and the parameter of RXVECTOR, and then send a CSI action frame to the information sending end, and return a CSI report frame, where the SNR value is contained.
The method for calculating the SNR is mainly based on the structure of a long and short training sequence in the preamble information of the physical layer PPDU.
The specific method comprises the following steps: the two identical preamble sequences are subtracted from each other in frequency domain to obtain the noise power.
With the frame preamble structure of the physical layer defined in 802.11, two consecutive Long Training Sequences (LTFs) can be expressed as:
Y 0,k ＝X 0,k H 0,k +W 0,k ；
Y 1,k ＝X 1,k H 1,k +W 1,k .
the two long training sequences are identical, so there is X 1,k ＝X 0,k . And the channel can be considered the same in both training symbols, i.e. H 1,k ＝H 0,k . Thus, the above two formulas are subtracted to obtain:
Y 1,k -Y 0,k ＝W 1,k -W 0,k .
since the noise signal is an independent random Gaussian white noise signal with an expected value of 0, variance and powerThe spectral density is proportional, so that by mathematical calculation, the above formula Y 1,k -Y 0,k ＝W 1,k -W 0,k The average power of two sides can obtain twice the noise power. The noise power is obtained, and an accurate signal-to-noise ratio SNR value can be obtained by calculating the ratio of the noise power to the received signal power.
And S120, matching an available MCS list conforming to the protocol specification according to the SNR value and the preset protocol specification, and selecting the MCS with the highest level from the available MCS list as the optimal MCS of the current channel.
Referring to table 1, the protocol is specified by way of example as follows: the 802.11ac regulation protocol specifies that the channel SNR conditions corresponding to different MCS levels are different, for example, the SNR constraints of VHT MCSs 0-9 are expressed as follows:
table 1 802.11ac defines SNR thresholds for each MCS
Modulation 20MHz 40MHz 80MHz 160MHz
MCS 0 2dB 5dB 8dB 11dB
MCS 1 5dB 8dB 11dB 14dB
MCS 2 9dB 12dB 15dB 18dB
MCS 3 11dB 14dB 17dB 21dB
MCS 4 15dB 18dB 21dB 24dB
MCS 5 18dB 21dB 24dB 27dB
MCS 6 20dB 23dB 26dB 29dB
MCS 7 25dB 28dB 31dB 34dB
MCS 8 29dB 32dB 35dB 38dB
MCS 9 31dB 34dB 37dB 40dB
Step S120 is to match the list of MCSs that can be used under the current channel condition according to the SNR value obtained in step S110, and then select the best MCS from the list for data transmission.
For example: when an SNR value of 18dB is obtained, if the current bandwidth is 20MHz, then the optional MCS list is (MCS 5,MCS 4,MCS 3,MCS 2,MCS 1,MCS 0), where the optimal MCS is MCS 5.
The MCS selection method based on the WLAN provided by the embodiment 1 of the invention can be combined with the feedback of the information receiving end and the range specified by the protocol to rapidly judge the optional MCS range and the optimal MCS, thereby being capable of selecting the rate according to the real-time channel information and effectively improving the efficiency and the reliability of MCS selection.
Example 2:
referring to fig. 2, embodiment 2 of the present invention provides a method for selecting a MCS based on a WLAN, which further includes the steps of:
and S130, when the fact that the current optimal MCS is not matched with the channel state is detected, adjusting the optimal MCS.
It should be noted that, the MCS parameters defined only by the negotiations of the two parties of the transmission and reception do not necessarily completely conform to the real-time channel state, and therefore, when the current rate is found to be not matched with the current wireless environment, the MCS needs to be replaced in time.
In the embodiment of the present invention, further, the method for determining in step S130 that the current optimal MCS does not match the channel status includes:
dividing the SNR report value of the current channel into N judgment sections, and determining adjustment thresholds corresponding to the judgment sections; wherein, N is a positive integer, and the adjustment threshold comprises a preset continuous retransmission threshold of the data packet and a preset packet loss rate threshold;
acquiring channel state information of a current channel; the channel state information comprises the continuous retransmission times and the packet loss rate of the data packet;
determining a target judgment section in which the SNR value is located, and comparing the channel state information with an adjustment threshold value of the target judgment section;
and when the number of continuous retransmission times of the data packet exceeds the continuous retransmission threshold of the data packet and the packet loss rate exceeds the packet loss rate threshold, judging that the current optimal MCS is not matched with the channel state.
In the embodiment of the invention, the criterion for judging whether the current MCS is matched with the channel state is to judge whether the continuous retransmission times and the packet loss rate of the data packet in a certain period exceed a threshold value. Because the continuous retransmission times and the packet loss rate of the data packets are related to the channel quality and whether the channel access encounters serious conflict, the invention simply uses the division SNR value as the judgment basis to set different continuous retransmission times thresholds and packet loss rate thresholds of the data packets for the scenes with different channel quality.
The protocol specifies that the reported value of SNR ranges from-10 dB to 53.75dB with a 0.25dB step change interval. Therefore, the embodiment of the invention divides the SNR into N intervals, and in different SNR judging sections, the continuous retransmission threshold R of the data packet in the period T n And packet loss rate threshold E n Different. In the practical application scene, N, T, R n And E is n Can be adjusted appropriately. Examples are as follows:
assuming that N takes a value of 3 and T takes a value of 50ms, R 1 、R 2 And R is 3 The values are 4,6 and 8, E respectively 1 、E 2 And E is 3 The values are 15%,20% and 25%, respectively. The specific scheme is as follows;
when the SNR is less than or equal to-10 dB and less than or equal to 20dB, the continuous retransmission threshold of the data packet in 50ms is 4, and the packet loss rate threshold is 15%;
when the SNR is less than or equal to 20dB and less than 40dB, the continuous retransmission threshold of the data packet in 50ms is 6, and the packet loss rate threshold is 20%;
when the SNR is less than or equal to 40dB and is less than 54dB, the continuous retransmission threshold of the data packet in 50ms is 8, and the packet loss rate threshold is 25%.
In the embodiment of the invention, when the number of continuous retransmission times of the data packet exceeds the threshold value and the packet loss rate also exceeds the threshold value, the MCS needs to be readjusted.
In the embodiment of the present invention, further, the adjusting the optimal MCS specifically includes:
and selecting the highest level MCS left except the current optimal MCS from the available MCS list, and setting the highest level MCS as a new optimal MCS.
In the embodiment of the invention, the strategy for adjusting the optimal MCS is as follows: in the MCS list matched in step S120, the highest-level MCS remaining except the currently used MCS is found and the value is set as a new MCS.
If the SNR value acquired by the data transmitting end is not changed, the corresponding MCS list is not changed, and the MCS list determined after the SNR value is acquired last time is continued. The criterion for adjusting the MCS in the later period is based on the current SNR value.
The MCS selection method based on the WLAN provided by the embodiment 2 of the invention can timely replace the MCS when the current speed is not matched with the current wireless environment while obtaining the beneficial effects as in the embodiment 1, thereby effectively ensuring that the MCS selection can adapt to complex and changeable wireless channel conditions.
Example 3:
referring to fig. 3, embodiment 3 of the present invention provides a method for selecting a MCS based on a WLAN, which further includes the steps of:
and S140, calculating the SNR floating value of the channel in real time by the data receiving end, and when the SNR floating value is monitored to exceed a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding back to the data transmitting end so that the data transmitting end can re-match the available MCS list and re-select the optimal MCS according to the latest SNR value.
In the embodiment of the present invention, further, the method for selecting MCS based on WLAN further includes the steps of:
s150, re-requesting the data receiving end to feed back the CSI report every a preset fixed period, re-matching an available MCS list according to the latest acquired SNR value, and re-selecting the optimal MCS.
It should be noted that, in the embodiment of the present invention, in order to ensure high quality of wireless communication and better use of feedback information of the data receiving end, two mechanisms are specified in the embodiment of the present invention, specifically exemplified as follows:
mechanism one: when the link condition changes, the data receiving end actively feeds back the SNR:
when the data receiving end finds that the SNR value of the channel continuously floats (rises or falls by 5 dBm) within a period of time Δt, the SNR value needs to be actively fed back to the data transmitting end. The initial value of Δt is 50ms, which can be specifically adjusted according to practical situations.
Mechanism II: fixed period P updates MCS:
every time a fixed period (the initial value is 1s, and can be adjusted according to actual conditions), the data transmitting end needs to send the CSI measurement request to the receiving end again, and the data receiving end gives feedback. The data transmitting end reselects and adjusts the MCS according to the new SNR information. In other words, the embodiment of the present invention provides that the procedure of MCS selection in embodiment 1 is automatically performed once every one period P passes.
By way of example, the main algorithm for MCS selection is as follows:
1. the data transmitting end requests the data receiving end to feed back Channel State Information (CSI);
2. the data receiving end responds to the request and returns a CSI report, wherein the CSI report contains an SNR value;
3. the data transmitting end selects an available MCS list according to the minimum SNR value required by each MCS, and the maximum MCS value is preferentially selected from the list.
4. Adjusting MCS
5. Dividing the SNR into N intervals, and correspondingly setting a retransmission times threshold R in a period T in different SNR intervals n And packet loss rate threshold E n ；
If, for different SNR intervals, the threshold of retransmission times and the threshold of packet loss rate in the period T exceed the threshold;
7. selecting the maximum MCS value left except the current MCS from the MCS list in the step 3;
8.endif；
the if receiving end detects that the SNR value in delta t continuously floats (rises or falls by 5 dBm);
10. the receiving end automatically feeds back the CSI report, wherein the CSI report contains the latest SNR value, and then the transmitting end adjusts the MCS list and the optimal MCS value in real time;
11.endif。
another example of the WLAN-based MCS selection method of the embodiment of the present invention is as follows:
step 1, a data transmitting end transmits a CSI measurement request frame to a data receiving end to request an opposite end to measure channel quality. The data receiving end responds and returns a CSI report.
And step 2, the data transmitting end acquires the SNR of the current channel according to the CSI request, the sounding PPDU and the CSI report.
And step 3, selecting an MCS list and an optimal MCS according to the SNR threshold corresponding to the different MCS specified by the protocol.
Step 4, dividing N different SNR intervals according to different SNR values; for different SNR intervals, different thresholds of continuous retransmission times and packet loss rate of the data packet are provided; and when the continuous retransmission times and the packet loss rate of the data packet in the time T exceed the corresponding thresholds, adjusting the MCS.
And step 5, if the data receiving end detects that the SNR of the channel continuously floats by +/-5 dBm, actively feeding back the CSI report to the data transmitting end so as to change the MCS of the opposite party.
Step 6, repeating the above steps 1 to 5 every time a fixed period P passes.
The MCS selection method based on WLAN provided in embodiment 3 of the present invention, while obtaining the beneficial effects as in embodiment 1, effectively ensures continuous high quality of wireless communication and better uses feedback information of the data receiving end by defining a mechanism for periodically maintaining MCS selection, thereby effectively ensuring that MCS selection can adapt to complex and variable wireless channel conditions.
Example 4:
referring to fig. 4, in order to solve the same technical problem, embodiment 4 of the present invention further provides a MCS selection method based on WLAN, including the steps of:
s210, receiving a CSI measurement request and a PPDU detection frame which are sent by the data sending end;
s220, carrying out CSI calculation according to the CSI measurement request and the PPDU detection frame, and feeding back a CSI report to the data sending end, so that the data sending end matches an available MCS list conforming to the protocol specification according to an SNR value in the CSI report and the preset protocol specification, and selects the MCS with the highest level from the available MCS list as the optimal MCS of the current channel.
In the embodiment of the present invention, further, the method for selecting MCS based on WLAN further includes the steps of:
s230, calculating an SNR floating value of a channel in real time, and when the SNR floating value is monitored to exceed a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding back to the data transmitting end, so that the data transmitting end re-matches an available MCS list and re-selects an optimal MCS according to the latest SNR value.
The MCS selection method based on WLAN provided by the embodiment 4 of the invention can be combined with the feedback of the information receiving end and the range specified by the protocol to rapidly judge the optional MCS range and the optimal MCS, thereby being capable of selecting the rate according to the real-time channel information and effectively improving the efficiency and the reliability of MCS selection; in addition, the embodiment of the invention can monitor the link condition in real time, and when the link condition is changed, the data receiving end actively feeds back the SNR to reselect the optimal MCS, thereby effectively ensuring that the MCS selection can adapt to complex and changeable wireless channel conditions.
It should be noted that, for simplicity of description, the above method or flow embodiments are all described as a series of combinations of actions, but it should be understood by those skilled in the art that the above embodiment of the invention is not limited by the order of actions described, as some steps may be performed in other order or simultaneously according to the embodiment of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are all alternative embodiments and that the actions involved are not necessarily required for the embodiments of the present invention.
Example 5:
referring to fig. 5, in order to solve the same technical problem, embodiment 5 of the present invention further provides a MCS selection system based on WLAN, including a data transmitting end and a data receiving end; wherein,
the data transmitting end is used for transmitting a CSI measurement request and a PPDU detection frame to the data receiving end;
the data receiving end is used for carrying out CSI calculation according to the CSI measurement request and the PPDU detection frame and feeding back a CSI report to the data sending end; wherein the CSI report includes an SNR value;
the data transmitting end is further configured to match an available MCS list according to the SNR value and a preset protocol rule, and select an MCS with a highest level from the available MCS list as an optimal MCS of a current channel.
In the embodiment of the present invention, further, the data sending end is further configured to: and when the fact that the current optimal MCS is not matched with the channel state is detected, adjusting the optimal MCS.
In the embodiment of the present invention, further, the data receiving end is further configured to: and calculating the SNR floating value of the channel in real time, and when the SNR floating value is monitored to exceed a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding back to the data transmitting end so that the data transmitting end can re-match the available MCS list and re-select the optimal MCS according to the latest SNR value.
In the embodiment of the present invention, further, the data sending end is further configured to: and re-requesting the data receiving end to feed back the CSI report at intervals of a preset fixed period, re-matching an available MCS list according to the latest acquired SNR value, and re-selecting the optimal MCS.
The MCS selection system based on WLAN provided by the embodiment 5 of the invention can combine the feedback of the information receiving end and the range specified by the protocol to rapidly judge the optional MCS range and the optimal MCS, thereby being capable of selecting the rate according to the real-time channel information and effectively improving the efficiency and the reliability of MCS selection; in addition, the embodiment of the invention can also adjust the MCS in real time according to the channel state, and set a fixed period to update and adjust the MCS periodically, thereby effectively ensuring that the MCS is selected to adapt to complex and changeable wireless channel conditions.
It can be understood that the above system item embodiment corresponds to the method item embodiment of the present invention, and the WLAN-based MCS selection system provided by the embodiment of the present invention may implement the WLAN-based MCS selection method provided by any one of the method item embodiments of the present invention.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (10)

1. A WLAN-based MCS selection method, comprising:
transmitting a CSI measurement request and a PPDU detection frame to a data receiving end, so that the data receiving end carries out CSI calculation and feeds back a CSI report according to the CSI measurement request and the PPDU detection frame; wherein the CSI report includes an SNR value;
and matching an available MCS list under the specific bandwidth condition conforming to the protocol specification according to the SNR value and the preset protocol specification, and selecting the MCS with the highest level from the available MCS list as the optimal MCS of the current channel.
2. The WLAN-based MCS selection method according to claim 1, further comprising:
and when the fact that the current optimal MCS is not matched with the channel state is detected, adjusting the optimal MCS.
3. The WLAN-based MCS selection method according to claim 2, wherein the method of determining that the current optimal MCS does not match the channel state comprises:
dividing the SNR report value of the current channel into N judgment sections, and determining adjustment thresholds corresponding to the judgment sections; wherein, N is a positive integer, and the adjustment threshold comprises a preset continuous retransmission threshold of the data packet and a preset packet loss rate threshold;
acquiring channel state information of a current channel; the channel state information comprises the continuous retransmission times and the packet loss rate of the data packet;
determining a target judgment section in which the SNR value is located, and comparing the channel state information with an adjustment threshold value of the target judgment section;
and when the number of continuous retransmission times of the data packet exceeds the continuous retransmission threshold of the data packet and the packet loss rate exceeds the packet loss rate threshold, judging that the current optimal MCS is not matched with the channel state.
4. The MCS selection method based on WLAN according to claim 2, characterized in that said adjusting the optimal MCS is in particular:
and selecting the highest level MCS left except the current optimal MCS from the available MCS list, and setting the highest level MCS as a new optimal MCS.
5. The WLAN-based MCS selection method according to claim 1, further comprising:
and re-requesting the data receiving end to feed back the CSI report at intervals of a preset fixed period, re-matching an available MCS list according to the latest acquired SNR value, and re-selecting the optimal MCS.
6. A WLAN-based MCS selection method, comprising:
receiving a CSI measurement request sent by a data sending end and a PPDU detection frame;
and carrying out CSI calculation according to the CSI measurement request and the PPDU detection frame, and feeding back a CSI report to the data transmitting end, so that the data transmitting end matches an available MCS list under the specific bandwidth condition conforming to the protocol specification according to the SNR value in the CSI report and the preset protocol specification, and selects the highest-level MCS from the available MCS list as the optimal MCS of the current channel.
7. The WLAN-based MCS selection method according to claim 6, further comprising:
and calculating the SNR floating value of the channel in real time, and when the SNR floating value is monitored to exceed a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding back to the data transmitting end so that the data transmitting end can re-match the available MCS list and re-select the optimal MCS according to the latest SNR value.
8. The MCS selection system based on the WLAN is characterized by comprising a data transmitting end and a data receiving end; wherein,
the data transmitting end is used for transmitting a CSI measurement request and a PPDU detection frame to the data receiving end;
the data receiving end is used for carrying out CSI calculation according to the CSI measurement request and the PPDU detection frame and feeding back a CSI report to the data sending end; wherein the CSI report includes an SNR value;
the data transmitting end is also used for matching available MCS list under specific bandwidth condition conforming to the protocol according to the SNR value and the preset protocol specification, and selecting the MCS with the highest level from the available MCS list as the optimal MCS of the current channel.
9. The WLAN-based MCS selection system according to claim 8, wherein the data sender is further configured to: and when the fact that the current optimal MCS is not matched with the channel state is detected, adjusting the optimal MCS.
10. The WLAN-based MCS selection system according to claim 8, wherein the data receiving side is further configured to: and calculating the SNR floating value of the channel in real time, and when the SNR floating value is monitored to exceed a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding back to the data transmitting end so that the data transmitting end can re-match the available MCS list and re-select the optimal MCS according to the latest SNR value.
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