CN110831072A - MCS selection method and system based on WLAN - Google Patents

MCS selection method and system based on WLAN Download PDF

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CN110831072A
CN110831072A CN201911036072.0A CN201911036072A CN110831072A CN 110831072 A CN110831072 A CN 110831072A CN 201911036072 A CN201911036072 A CN 201911036072A CN 110831072 A CN110831072 A CN 110831072A
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mcs
snr
value
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data
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CN110831072B (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 a system based on WLAN, the method comprises: sending 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 contains an SNR value; and matching an available MCS list according with the protocol regulation according to the SNR value and the preset protocol regulation, and selecting the MCS with the highest grade 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 quickly judge the optional MCS range and the optimal MCS, thereby being capable of selecting the rate 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 perform periodic updating adjustment on the MCS, thereby effectively ensuring that the selection of the MCS can adapt to the complex and changeable wireless channel condition.

Description

MCS selection method and system based on WLAN
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a MCS selection method and system based on a WLAN.
Background
In a wireless communication network, after both data transceivers establish a communication connection, the data transceivers must select a transmission rate, and the rate is continuously adjusted during the communication to achieve optimal network performance. The rate selection process involves an MCS selection algorithm.
Due to the time-varying nature of the wireless communication channel, the data transmission rate generally needs to be adjusted in time to adapt to the channel variations. The protocol only specifies the available MCS levels (e.g., in the 802.11ac WLAN protocol, in the VHT based protocol mode, the MCS is optionally in the range of MCS 0-9), but does not specify how to choose the appropriate MCS. Generally, the selection of the MCS is closely related to the quality of the current wireless environment. The data transmission rate can be well improved by using a high-level MCS, but the requirement on a wireless channel is high, and if the channel condition is not good, the data frame demodulation is easy to fail.
The rate selection methods mentioned in the current large chip manufacturers or papers/patents are mostly: the current MCS level is raised/lowered based on historical statistics (such as average packet loss rate/duration of successful transmission of data/number of retransmissions/statistics of block ack, etc. over the previous period of time). The method only needs the probing and counting of the sending end and does not need the feedback of the receiving end, so the design is simpler, and the use is wider.
However, this method of adjusting the rate only based on the statistical information of the transmitting end lacks mutual negotiation and feedback between both data transmitting and receiving parties, and cannot make a decision based on the real-time channel information, resulting in low MCS selection efficiency and reliability.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method and a system for MCS selection based on WLAN, which can perform MCS selection by using information negotiated and fed back between both data transceivers, and can make a determination according to real-time channel information, thereby improving MCS selection efficiency and reliability.
In order to solve the above technical problem, an embodiment of the present invention provides a method for selecting an MCS based on a WLAN, including:
sending a CSI measurement request and a PPDU detection frame to a data receiving end so that the data receiving end performs CSI calculation and feeds back a CSI report according to the CSI measurement request and the PPDU detection frame; wherein the CSI report contains an SNR value;
and matching an available MCS list according with the protocol regulation according to the SNR value and the preset protocol regulation, and selecting the MCS with the highest grade from the available MCS list as the optimal MCS of the current channel.
Further, the method for selecting MCS based on WLAN further includes:
and when the current optimal MCS is not matched with the channel state, adjusting the optimal MCS.
Further, the method for determining that the current optimal MCS is not matched with the channel state includes:
dividing the SNR report value of the current channel into N judgment intervals, and determining an adjustment threshold corresponding to each judgment interval; wherein, N is a positive integer, and the adjustment threshold comprises a preset data packet continuous retransmission threshold 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 packets;
determining a target judgment interval in which the SNR value is positioned, and comparing the channel state information with an adjustment threshold value of the target judgment interval;
and when the continuous retransmission times of the data packet exceed 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 rest highest level MCS except the current optimal MCS from the available MCS list, and setting the MCS as the new optimal MCS.
Further, the method for selecting MCS based on WLAN further includes:
and re-requesting the data receiving end to feed back the CSI report every other preset fixed period, re-matching an available MCS list according to the newly obtained 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 WLAN-based MCS selection method, including:
receiving a CSI measurement request and a PPDU detection frame sent by the data sending end;
and performing 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 according with the protocol specification according to an SNR value in the CSI report and a preset protocol specification, and selects the MCS with the highest grade from the available MCS list as the optimal MCS of the current channel.
Further, the method for selecting MCS based on WLAN further includes:
and calculating the SNR floating value of the channel in real time, and when the SNR floating value exceeds a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding the SNR value back to the data sending end so that the data sending end re-matches an available MCS list according to the latest SNR value and re-selects the optimal MCS.
In order to solve the same technical problem, a further aspect of the present invention further provides a WLAN-based MCS selection system, including a data transmitting end and a data receiving end; wherein the content of the first and second substances,
the data sending end is used for sending 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 contains an SNR value;
the data sending end is further configured to match an available MCS list meeting the protocol specification according to the SNR value and a preset protocol specification, and select a highest-level MCS from the available MCS list as an optimal MCS for a current channel.
Further, the data sending end is further configured to: and when the current optimal MCS is not matched with the channel state, 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 exceeds a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding the SNR value back to the data sending end so that the data sending end re-matches an available MCS list according to the latest SNR value and re-selects the optimal MCS.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a MCS selection method and a system based on a WLAN, wherein the method comprises the following steps: sending a CSI measurement request and a PPDU detection frame to a data receiving end so that the data receiving end performs CSI calculation and feeds back a CSI report according to the CSI measurement request and the PPDU detection frame; wherein the CSI report contains an SNR value; and matching an available MCS list according with the protocol regulation according to the SNR value and the preset protocol regulation, and selecting the MCS with the highest grade 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 quickly judge the selectable MCS range and the optimal MCS, thereby carrying out rate selection according to the real-time channel information and effectively improving the efficiency and the 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 perform periodic updating adjustment on the MCS, thereby effectively ensuring that the selection of the MCS can adapt to the complex and changeable wireless channel condition.
Drawings
Fig. 1 is a flowchart illustrating a WLAN-based MCS selection method according to embodiment 1 of the present invention;
fig. 2 is a flowchart illustrating a WLAN-based MCS selection method according to embodiment 2 of the present invention;
fig. 3 is a flowchart illustrating steps S140-S150 in the WLAN-based MCS selection method according to embodiment 3 of the present invention;
FIG. 4 is a flowchart of a WLAN-based MCS selection method according to embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of a WLAN-based MCS selection system according to embodiment 5 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention selects the MCS (Modulation and Coding Scheme, Modulation and Coding strategy) according to the overall thought as follows: the SNR (Signal-to-Noise-Ratio) value of the current communication link is obtained, and then the optimal MCS value in the specified range is selected according to the protocol specification.
Example 1:
referring to fig. 1, an embodiment of the present invention provides a method for selecting MCS based on WLAN, including 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 performs CSI calculation and feeds back a CSI report according to the CSI measurement request and the PPDU detection frame; wherein the CSI report contains an SNR value.
In step S110, the data sending end needs to obtain the SNR value of the link according to the feedback of the information receiving end.
When an STA (a terminal connected to a wireless network) wants to know an SNR value of a current Channel, a CSI (Channel State Information) detection request and a sounding frame (sounding PPDU) can be sent to an opposite-end STA, a data receiving end can perform CSI calculation according to preamble Information, a long and short training sequence, subcarrier real transmitting power and real receiving power negotiated by a transmitting and receiving end and parameters of RXVECTOR of the sounding PPDU, then send a CSI action frame to an Information sending end, and return a CSI report frame, where the CSI action frame includes the SNR value.
The method for calculating the SNR is mainly based on the structure of long and short training sequences in the preamble information of the physical layer PPDU.
The specific method comprises the following steps: and subtracting the two same leader sequences in frequency domains to calculate the noise power.
With the frame preamble structure of the physical layer defined in 802.11, two consecutive Long Training Sequences (LTFs) can be represented as:
Y0,k＝X0,kH0,k+W0,k；
Y1,k＝X1,kH1,k+W1,k.
two long training sequences are identical, so there is X1,k＝X0,k. And the channel can be considered identical within two training symbols, i.e. H1,k＝H0,k. Thus, subtracting the above two equations yields:
Y1,k-Y0,k＝W1,k-W0,k.
since the noise signal is an independent random white gaussian noise signal, the expected value is 0, and the variance is proportional to the power spectral density, the above formula Y is mathematically calculated1,k-Y0,k＝W1,k-W0,kAnd the average power of the two sides is obtained, so that double noise power can be obtained. The noise power is obtained, and the accurate SNR value can be obtained by calculating the ratio of the noise power to the received signal power.
S120, according to the SNR value and a preset protocol regulation, matching an available MCS list meeting the protocol regulation, and selecting the MCS with the highest grade from the available MCS list as the optimal MCS of the current channel.
Referring to table 1, examples of protocol specifications are as follows: the 802.11ac stipulates that the protocol stipulates that the channel SNR conditions corresponding to different MCS levels are different, for example, the SNR constraints of VHT MCS 0-9 are expressed as follows:
table 1802.11 ac specifies SNR thresholds for 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 a MCS list 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 MCS list for data transmission.
For example: when the acquired SNR value is 18dB, if the current bandwidth is 20MHz, the selectable MCS lists are (MCS 5, MCS 4, MCS 3, MCS 2, MCS 1, MCS 0), where the best MCS is MCS 5.
The MCS selection method based on WLAN according to embodiment 1 of the present invention can quickly determine the selectable MCS range and the optimal MCS according to the feedback of the information receiving end and the range specified by the protocol, so as to select the rate according to the real-time channel information, thereby effectively improving the efficiency and reliability of MCS selection.
Example 2:
referring to fig. 2, an embodiment 2 of the present invention provides a WLAN-based MCS selection method, and on the basis of the WLAN-based MCS selection method of embodiment 1, the method further includes the following steps:
s130, when the situation that the current optimal MCS is not matched with the channel state is monitored, the optimal MCS is adjusted.
It should be noted that the MCS parameters specified only by the negotiation between the transmitter and the receiver do not always completely match the real-time channel state, and therefore, when the current rate is found not to match the current radio environment, the MCS needs to be changed in time.
In this embodiment of the present invention, further, the method for determining in step S130 that the current optimal MCS does not match the channel state includes:
dividing the SNR report value of the current channel into N judgment intervals, and determining an adjustment threshold corresponding to each judgment interval; wherein, N is a positive integer, and the adjustment threshold comprises a preset data packet continuous retransmission threshold 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 packets;
determining a target judgment interval in which the SNR value is positioned, and comparing the channel state information with an adjustment threshold value of the target judgment interval;
and when the continuous retransmission times of the data packet exceed 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 the threshold value. Because the continuous retransmission times and the packet loss rate of the data packets are not only related to the channel quality, but also related to whether the channel access encounters serious conflict, the method simply takes the division SNR value as the judgment basis to set different continuous retransmission times threshold values and packet loss rate threshold values of the data packets for the situations with different channel qualities.
The protocol specifies that the reported value of SNR ranges from-10 dB to 53.75dB with 0.25dB steps between changes. Therefore, the embodiment of the invention divides SNR into N intervals, and in different SNR judgment intervals, the data packet continuous retransmission threshold value R in the period TnAnd a packet loss rate threshold EnDifferent. In the practical application scenario, N, T, RnAnd EnCan be adjusted appropriately. Examples are as follows:
assuming that N takes a value of 3, T takes a value of 50ms, R1、R2And R3Respectively taking the values of 4, 6 and 8, E1、E2And E3The values are 15%, 20% and 25%, respectively. The specific scheme is as follows;
when SNR is less than 20dB and is less than or equal to-10 dB, the continuous retransmission threshold of the data packet within 50ms is 4, and the packet loss rate threshold is 15%;
when SNR is less than 40dB and is more than or equal to 20dB, the continuous retransmission threshold of the data packet in 50ms is 6, and the packet loss rate threshold is 20%;
when SNR is less than 54dB or equal to 40dB, 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 present invention, when the number of consecutive retransmissions of a data packet exceeds a threshold and the packet loss rate also exceeds the threshold, the MCS needs to be readjusted.
In this embodiment of the present invention, further, the adjusting the optimal MCS specifically includes:
and selecting the rest highest level MCS except the current optimal MCS from the available MCS list, and setting the MCS as the new optimal MCS.
In the embodiment of the present invention, the strategy for adjusting the optimal MCS is as follows: in the MCS list matched in step S120, the remaining highest-level MCS except for the currently used MCS is found, and the value is set as a new MCS.
It should be noted that, if the SNR value obtained by the data sending end is not changed, the corresponding MCS list is not changed, and the MCS list determined after the SNR value is obtained last time is continuously used. The criterion for adjusting the MCS at the later stage is based on the current SNR value.
The method for selecting the MCS based on the WLAN, provided by the embodiment 2 of the invention, has the beneficial effects of the embodiment 1, and can replace the MCS in time when the current rate is found to be unmatched with the current wireless environment, so that the selection of the MCS can be effectively ensured to be suitable for the complex and changeable wireless channel conditions.
Example 3:
referring to fig. 3, an embodiment 3 of the present invention provides a WLAN-based MCS selection method, and on the basis of the WLAN-based MCS selection method of embodiment 1, the method further includes the following steps:
s140, the data receiving end calculates SNR floating value of the channel in real time, and when it is monitored that the SNR floating value exceeds a preset threshold value in a preset time interval, the SNR value of the current channel is obtained and fed back to the data sending end, so that the data sending end re-matches an available MCS list according to the latest SNR value and re-selects an optimal MCS.
In this embodiment of the present invention, further, the method for selecting MCS based on WLAN further includes the steps of:
s150, requesting the data receiving end to feed back the CSI report again at intervals of a preset fixed period, and re-matching an available MCS list according to the newly obtained 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 feedback information of a data receiving end, two mechanisms are specified in the embodiment of the present invention, and specific examples are as follows:
the first mechanism is as follows: when the link condition changes, the data receiving end actively feeds back SNR:
when the data receiving end finds that the SNR value of the channel continuously floats (rises or falls by 5dBm) within a period of time delta t, the SNR value needs to be actively fed back to the data transmitting end. The initial value of Δ t is 50ms, which can be adjusted according to actual conditions.
And a second mechanism: updating MCS with fixed period P:
after a fixed period (the initial value is 1s, which can be adjusted according to actual conditions), the data sending end sends the CSI measurement request to the receiving end again, and the data receiving end gives feedback. And the data sending end reselects and adjusts the MCS according to the new SNR information. In other words, the embodiment of the present invention provides that the MCS selection process in embodiment 1 is automatically performed every time a period P passes.
By way of example, the main algorithm for MCS selection is as follows:
1. the data sending 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 which contains an SNR value;
3. the data transmitting end selects an available MCS list according to the lowest SNR value required by each MCS, and preferentially selects the largest MCS value from the list.
4.// adjusting MCS
5. Dividing SNR into N intervals, and setting retransmission time threshold R in period T correspondingly in different SNR intervalsnAnd a packet loss rate threshold En；
If, aiming at different SNR intervals, the threshold value of retransmission times and the threshold value of packet loss rate in the period T both exceed the threshold values;
7. selecting the maximum MCS value left from the MCS list in the step 3 except the current MCS;
8.endif；
if the receiving end detects that the SNR value in the delta t continuously floats (rises or falls by 5 dBm);
10. the receiving end automatically feeds back a CSI report which 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 MCS selection method based on WLAN according to the embodiment of the present invention is as follows:
step 1, a data sending end sends a CSI measurement request frame to a data receiving end to request an opposite end to measure the channel quality. And the data receiving end responds and returns a CSI report.
And step 2, the data sending end acquires the SNR of the current channel according to the CSI request, the sounding PPDU and the CSI report.
And step 3, selecting the MCS list and the 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; aiming at different SNR intervals, different thresholds of continuous retransmission times and packet loss rate of the data packets exist; and when the continuous retransmission times and the packet loss rate of the data packet in the time T both exceed the corresponding threshold values, adjusting the MCS.
And step 5, when the data receiving end detects that the SNR of the channel continuously floats within +/-5 dBm within the delta t, actively feeding back a CSI report to the data sending end so as to facilitate the other end to change the MCS.
And 6, repeating the steps 1 to 5 every time a fixed period P passes.
The MCS selection method based on WLAN according to embodiment 3 of the present invention, while obtaining the beneficial effects of embodiment 1, effectively ensures continuous high quality of wireless communication by specifying a mechanism for periodically maintaining MCS selection, and better utilizes feedback information of a data receiving end, 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 method for selecting a MCS based on a WLAN, which includes the steps of:
s210, receiving a CSI measurement request and a PPDU detection frame sent by the data sending end;
s220, CSI calculation is carried out according to the CSI measurement request and the PPDU detection frame, and a CSI report is fed back to the data sending end, so that the data sending end matches an available MCS list according with the protocol regulation according to the SNR value in the CSI report and a preset protocol regulation, and the MCS with the highest grade is selected from the available MCS list to serve as the optimal MCS of the current channel.
In this embodiment of the present invention, further, the method for selecting MCS based on WLAN further includes the steps of:
and 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 in a preset time interval, acquiring the SNR value of the current channel and feeding the SNR value back to the data sending end, so that the data sending end re-matches an available MCS list according to the latest SNR value and re-selects an optimal MCS.
The MCS selection method based on WLAN provided in embodiment 4 of the present invention can quickly determine the selectable MCS range and the optimal MCS according to the feedback of the information receiving end and the range specified by the protocol, so as to select the rate according to the real-time channel information, thereby effectively improving the efficiency and reliability of MCS selection; in addition, the embodiment of the invention can monitor the link condition in real time, and when the link condition changes, the data receiving end actively feeds back the SNR to reselect the optimal MCS, thereby effectively ensuring that the selection of the MCS can adapt to the complex and changeable wireless channel condition.
It should be noted that the above method or flow embodiment is described as a series of acts or combinations for simplicity, but those skilled in the art should understand that the above embodiment is not limited by the described acts or sequences, as some steps may be performed in other sequences or simultaneously according to the embodiment. Further, those skilled in the art will appreciate that the embodiments described in the specification are exemplary embodiments and that no single embodiment is necessarily required by the inventive embodiments.
Example 5:
referring to fig. 5, in order to solve the same technical problem, embodiment 5 of the present invention further provides a WLAN-based MCS selection system, including a data transmitting end and a data receiving end; wherein the content of the first and second substances,
the data sending end is used for sending 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 contains an SNR value;
the data sending end is further configured to match an available MCS list meeting the protocol specification according to the SNR value and a preset protocol specification, and select a highest-level MCS from the available MCS list as an optimal MCS for a current channel.
In this embodiment of the present invention, further, the data sending end is further configured to: and when the current optimal MCS is not matched with the channel state, adjusting the optimal MCS.
In this 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 exceeds a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding the SNR value back to the data sending end so that the data sending end re-matches an available MCS list according to the latest SNR value and re-selects the optimal MCS.
In this 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 every other preset fixed period, re-matching an available MCS list according to the newly obtained SNR value and re-selecting the optimal MCS.
The MCS selection system based on WLAN provided in embodiment 5 of the present invention can quickly determine the selectable MCS range and the optimal MCS according to the feedback of the information receiving end and the range specified by the protocol, so as to select the rate according to the real-time channel information, thereby effectively improving the efficiency and 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 perform periodic updating adjustment on the MCS, thereby effectively ensuring that the selection of the MCS can adapt to the complex and changeable wireless channel condition.
It should be understood that the above system item embodiments correspond to the method item embodiments of the present invention, and the WLAN based MCS selection system provided in the embodiment of the present invention may implement the WLAN based MCS selection method provided in any method item embodiment of the present invention.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A WLAN based MCS selection method, comprising:
sending a CSI measurement request and a PPDU detection frame to a data receiving end so that the data receiving end performs CSI calculation and feeds back a CSI report according to the CSI measurement request and the PPDU detection frame; wherein the CSI report contains an SNR value;
and matching an available MCS list according with the protocol regulation according to the SNR value and the preset protocol regulation, and selecting the MCS with the highest grade from the available MCS list as the optimal MCS of the current channel.
2. The WLAN based MCS selection method of claim 1, further comprising:
and when the current optimal MCS is not matched with the channel state, adjusting the optimal MCS.
3. The method of claim 2, wherein the 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 intervals, and determining an adjustment threshold corresponding to each judgment interval; wherein, N is a positive integer, and the adjustment threshold comprises a preset data packet continuous retransmission threshold 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 packets;
determining a target judgment interval in which the SNR value is positioned, and comparing the channel state information with an adjustment threshold value of the target judgment interval;
and when the continuous retransmission times of the data packet exceed 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 WLAN based MCS selection method of claim 2, wherein the adjusting the optimal MCS is specifically:
and selecting the rest highest level MCS except the current optimal MCS from the available MCS list, and setting the MCS as the new optimal MCS.
5. The WLAN based MCS selection method of claim 1, further comprising:
and re-requesting the data receiving end to feed back the CSI report every other preset fixed period, re-matching an available MCS list according to the newly obtained SNR value and re-selecting the optimal MCS.
6. A WLAN based MCS selection method, comprising:
receiving a CSI measurement request and a PPDU detection frame sent by the data sending end;
and performing 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 according with the protocol specification according to an SNR value in the CSI report and a preset protocol specification, and selects the MCS with the highest grade 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 exceeds a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding the SNR value back to the data sending end so that the data sending end re-matches an available MCS list according to the latest SNR value and re-selects the optimal MCS.
8. A MCS selection system based on WLAN is characterized by comprising a data sending end and a data receiving end; wherein the content of the first and second substances,
the data sending end is used for sending 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 contains an SNR value;
the data sending end is further configured to match an available MCS list meeting the protocol specification according to the SNR value and a preset protocol specification, and select a highest-level MCS from the available MCS list as an optimal MCS for a current channel.
9. The WLAN based MCS selection system of claim 8, wherein the data transmitting end is further configured to: and when the current optimal MCS is not matched with the channel state, adjusting the optimal MCS.
10. The WLAN based MCS selection system of claim 8, wherein 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 exceeds a preset threshold value within a preset time interval, acquiring the SNR value of the current channel and feeding the SNR value back to the data sending end so that the data sending end re-matches an available MCS list according to the latest SNR value and re-selects the optimal MCS.
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