CN106612156A - Data frame wireless transmission method and device - Google Patents
Data frame wireless transmission method and device Download PDFInfo
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- CN106612156A CN106612156A CN201510703393.7A CN201510703393A CN106612156A CN 106612156 A CN106612156 A CN 106612156A CN 201510703393 A CN201510703393 A CN 201510703393A CN 106612156 A CN106612156 A CN 106612156A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
Abstract
The invention discloses a data frame wireless transmission method and device, and belongs to the technical field of communication. The data frame wireless transmission method comprises the steps of obtaining the quality of a channel between a transmitting terminal and a receiving terminal by the transmitting terminal; determining an aggregation frame length based on the obtained quality of the channel; aggregating data frames required to be transmitted based on the determined aggregation frame length, wherein the frame length of the aggregated data frames is less than or equal to the determined aggregation frame length; and sending the aggregated data frames to the receiving terminal. The data frame wireless transmission device comprises an obtaining module, a determining module, an aggregation module and a transmission module. The data frame wireless transmission method and device can dynamically change the frame length of aggregation under the condition of guaranteeing the real-time quality change of the channel, and accordingly realize smooth, real-time and efficient wireless transmission of the data frames.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of Frame radio transmitting method and device.
Background technology
Individual soldier or field personnel (such as fire fighter) need collection site information (example in operation
Such as multi-medium data), and the information of collection is reached by Surveillance center by WLAN, for related personnel point
Analysis.Specifically, the information of collection can be reached by Surveillance center using wireless transmission standards agreement 802.11n,
The frequency range that the information of transmission collection is used can be industry, science and medical frequency range (Industrial Scientific
Medical Band), i.e. 2.412～2.472GHz.
During the present invention is realized, inventor has found that prior art at least has problems with：
802.11n is only supported with fixed frame length transmitting data frame.Because industry, science and medical frequency range are to open
Frequency range is put, there are problems that channel time-varying, transmission signal intensity change at random and terminal are interfered,
Therefore, when with fixed frame length transmitting data frame, if bad channel, channel FER will be caused to increase,
Frame retransmission probability increases, and so as to increase system burden, reduces throughput of system；If channel is good,
Although then data retransmission probability is low, some unnecessary control overheads reduce channel utilization, so as to lead
Cause system does not improve throughput performance because channel quality improves.
The content of the invention
In order to ensure in industry, science and medical frequency range being capable of smooth, in real time and efficiently transmission datas
Frame, to reduce system burden and lift system handling capacity, embodiments provides a kind of Frame wireless
Transmission method and device.The technical scheme is as follows：
First aspect, there is provided a kind of Frame radio transmitting method, methods described includes：
Send the quality of the channel between terminal acquisition and receiving terminal；
According to the quality of the channel for obtaining, it is determined that polymerization frame length；
According to the polymerization frame length for determining, be polymerized the Frame that need to be sent；The frame length of the Frame of polymerization be less than or
Equal to the polymerization frame length of the determination；
The Frame of the polymerization is sent to the receiving terminal.
In the first embodiment of first aspect, the polymerization frame length is calculated according to equation below：
MSL is the polymerization frame length, and SNR is the numerical value of the quality of the channel.
It is described according to the polymerization frame length for determining in the second embodiment of first aspect, what polymerization need to send
Frame, including：
When polymerization current data frame is prepared, detect whether to there is do not send and frame length less than the polymerization for determining
The Frame of the polymerization of frame length；
When the Frame that there is no polymerization of the do not send and frame length less than the polymerization frame length for determining is detected,
The frame length of the comparison current data frame and the polymerization frame length of the determination；When the frame length of the current data frame
Equal to the determination polymerization frame length when, using the current data frame as polymerization Frame；Work as when described
When the frame length of front Frame is less than the polymerization frame length of the determination, with the current data frame as the data of polymerization
First frame of frame, the current data frame is aggregated in the Frame of the polymerization；When the current data
When the frame length of frame is more than the polymerization frame length of the determination, the current data frame is divided into at least two data
Frame piece, and at least two Frames piece is polymerized to into the Frame of at least two polymerizations；Described at least two
Each Frame includes Frame piece described at least one, at least two polymerization in the Frame of individual polymerization
Frame in include at least one frame length be equal to determine polymerization frame length Frame；
When the Frame of polymerization of the do not send and frame length less than the polymerization frame length for determining is detected the presence of, sentence
Whether the frame length of the current data frame of breaking is more than remaining frame length；The polymerization of a length of determination of the residue frame
Frame length deducts the frame length of the Frame of the polymerization of presence；
When the frame length of the current data frame is less than or equal to the remaining frame length, by the current data frame
In being aggregated to the Frame of the polymerization of presence；
When the frame length of the current data frame is more than the remaining frame length, the current data frame is divided into
At least two Frame pieces, and Frame piece described at least one is aggregated to the data of the polymerization of the presence
In frame, until the frame length of the Frame of the polymerization of the presence reaches the polymerization frame length of the determination, and will
Remaining Frame piece is polymerized to the Frame of at least one polymerization.
In the 3rd embodiment of first aspect, the Frame of the polymerization is sent to the receiving terminal,
Including：
In the quality of the channel for pre-building and the corresponding relation of modulation system, it is determined that the matter of the channel for obtaining
Measure corresponding modulation system；
According to the modulation system for determining, the Frame of the polymerization is modulated；
The Frame of modulation is sent to the receiving terminal.
In the 4th embodiment of first aspect, the quality of the channel between the acquisition and receiving terminal,
Including：
Receive the matter of the channel between the transmission terminal and the receiving terminal of the receiving terminal transmission
Amount, the quality of the channel is that the receiving terminal is estimated according to the designated symbols that the transmission terminal sends
Come.
Second aspect, there is provided a kind of Frame radio transmitting device, described device includes：
Acquisition module, for the quality of the channel between acquisition and receiving terminal；
Determining module, the quality of the channel for being obtained according to the acquisition module, it is determined that polymerization frame length；
Aggregation module, for the polymerization frame length determined according to the determining module, be polymerized the Frame that need to be sent；
Polymerization frame length of the frame length of the Frame of the aggregation module polymerization less than or equal to the determination；
Sending module, for sending the Frame of the aggregation module polymerization to the receiving terminal.
In the first embodiment of second aspect, the determining module calculates the polymerization according to equation below
Frame length：
MSL is the polymerization frame length, and SNR is the numerical value of the quality of the channel.
In the second embodiment of second aspect, the aggregation module is used for：
When polymerization current data frame is prepared, detect whether to there is do not send and frame length less than the polymerization for determining
The Frame of the polymerization of frame length；
When the Frame that there is no polymerization of the do not send and frame length less than the polymerization frame length for determining is detected,
The frame length of the comparison current data frame and the polymerization frame length of the determination；When the frame length of the current data frame
Equal to the determination polymerization frame length when, using the current data frame as polymerization Frame；Work as when described
When the frame length of front Frame is less than the polymerization frame length of the determination, with the current data frame as the data of polymerization
First frame of frame, the current data frame is aggregated in the Frame of the polymerization；When the current data
When the frame length of frame is more than the polymerization frame length of the determination, the current data frame is divided into at least two data
Frame piece, and at least two Frames piece is polymerized to into the Frame of at least two polymerizations；Described at least two
Each Frame includes Frame piece described at least one, at least two polymerization in the Frame of individual polymerization
Frame in include at least one frame length be equal to determine polymerization frame length Frame；
When the Frame of polymerization of the do not send and frame length less than the polymerization frame length for determining is detected the presence of, sentence
Whether the frame length of the current data frame of breaking is more than remaining frame length；The polymerization of a length of determination of the residue frame
Frame length deducts the frame length of the Frame of the polymerization of presence；
When the frame length of the current data frame is less than or equal to the remaining frame length, by the current data frame
In being aggregated to the Frame of the polymerization of presence；
When the frame length of the current data frame is more than the remaining frame length, the current data frame is divided into
At least two Frame pieces, and Frame piece described at least one is aggregated to the data of the polymerization of the presence
In frame, until the frame length of the Frame of the polymerization of the presence reaches the polymerization frame length of the determination, and will
Remaining Frame piece is polymerized to the Frame of at least one polymerization.
In the 3rd embodiment of second aspect, the sending module includes：
Determining unit, in the quality of the channel for pre-building and the corresponding relation of modulation system, it is determined that
The corresponding modulation system of quality of the channel of acquisition；
Modulating unit, for the modulation system determined according to the determining unit, modulates the data of the polymerization
Frame；
Transmitting element, for sending the Frame of the modulating unit modulation to the receiving terminal.
In the 4th embodiment of second aspect, the acquisition module is used for：
Receive the matter of the channel between the transmission terminal and the receiving terminal of the receiving terminal transmission
Amount, the quality of the channel is that the receiving terminal is estimated according to the designated symbols that the transmission terminal sends
Come.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
Send the quality of channel of the terminal by obtaining and between receiving terminal；According to the quality of the channel for obtaining,
It is determined that polymerization frame length；According to the polymerization frame length for determining, be polymerized the Frame that need to be sent；The Frame of polymerization
Frame length is less than or equal to the polymerization frame length for determining；The Frame of polymerization is sent to receiving terminal.Due to aggregate frame
Length is determined according to the quality of channel, then, when the quality of channel is preferable, it is determined that aggregate frame
Length can be with long；Channel it is second-rate when, it is determined that polymerization frame length can be shorter.So, to
When receiving terminal sends the Frame of polymerization, when the quality of channel is preferable, due to being polymerized, frame length is long,
When a number of data are sent, the number of data frames of the polymerization of transmission is less, saves some controls and opens
Pin, therefore channel resource can be made full use of, improve throughput of system.Channel it is second-rate when, by
It is shorter in polymerization frame length, it can be ensured that receiving terminal can receive the Frame of polymerization, reduce Frame
Retransmission probability, alleviates system burden, so as to improve throughput of system.To sum up, ensure that in channel
Quality real-time change in the case of, be capable of the frame length of dynamic change polymerization, it is achieved thereby that it is smooth, in real time,
And efficiently wirelessly transmitting data frame.
Description of the drawings
Technical scheme in order to be illustrated more clearly that the embodiment of the present invention, below will be to institute in embodiment description
The accompanying drawing that needs are used is briefly described, it should be apparent that, drawings in the following description are only the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work,
Can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is a kind of flow chart of Frame radio transmitting method that first embodiment of the invention is provided；
Fig. 2 is a kind of flow chart of Frame radio transmitting method that second embodiment of the invention is provided；
Fig. 3 is the form schematic diagram of the Frame of the polymerization that second embodiment of the invention is provided；
Fig. 4 is a kind of Frame radio transmitting device structural representation that third embodiment of the invention is provided；
Fig. 5 is a kind of Frame radio transmitting device structural representation that fourth embodiment of the invention is provided.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Embodiment is described in further detail.
In embodiments of the present invention, it is to send data to specified wireless terminal by WLAN to send terminal
The wireless terminal of frame.Receiving terminal is aforementioned specified wireless terminal, and for receiving the data that terminal sends are sent
Frame.
The wireless terminal being related in the embodiment of the present invention, can be mobile terminal, such as mobile phone (or be referred to as
" honeycomb " phone), or the computer with mobile terminal, for example, portable, pocket, hand
Hold formula, built-in computer or vehicle-mounted mobile device.
For example, individual soldier's Wireless Image Transmission Systems include transmitter and receiver, and transmitter and receiver pass through
Wireless LAN communication, transmitter is used to send multi-medium data to receiver, and receiver is used to receive transmission
The multi-medium data that machine sends.The transmission terminal includes transmitter, and the receiving terminal includes receiver.
A kind of flow chart of Frame radio transmitting method that Fig. 1 is provided for first embodiment of the invention.The party
Method can apply to send terminal.As shown in figure 1, the method comprises the steps.
The quality of the channel between step 101, acquisition and receiving terminal.
Optionally, step 101 is specifically included：Send terminal to receive the transmission terminal of receiving terminal transmission and connect
The quality of the channel between terminal is received, the quality of the channel is receiving terminal specifying according to transmission terminal transmission
What symbol was estimated.
Optionally, channel of the transmission terminal of terminal reception receiving terminal transmission between receiving terminal is being sent
Quality before, step 101 also includes：Send terminal to receiving terminal and send configured information；Configured information
For indicating that receiving terminal estimates the quality for sending the channel between terminal and receiving terminal according to designated symbols.
Step 102, according to obtain channel quality, it is determined that polymerization frame length.
Optionally, step 102 is specifically included：Send terminal and polymerization frame length is calculated according to equation below (1).
MSL is polymerization frame length, and SNR is the numerical value of the quality of channel, and In is the logarithm fortune with constant e as bottom
Calculate, erfc (x) is remaining compensating error function.
Step 103, the Frame that need to be sent according to the polymerization frame length for determining, polymerization.
Optionally, the frame length of the Frame of polymerization is less than or equal to the polymerization frame length for determining.
Optionally, the Frame that need to be sent includes at least one Frame, and step 103 is specifically included：In standard
During for polymerization current data frame, detect whether there is do not send and frame length gathering less than the polymerization frame length for determining
The Frame of conjunction.
When the Frame that there is no polymerization of the do not send and frame length less than the polymerization frame length for determining is detected,
The frame length for comparing current data frame and the polymerization frame length for determining.When the frame length of current data frame is equal to the poly- of determination
When closing frame length, using current data frame as the Frame being polymerized.When the frame length of current data frame is less than determination
During polymerization frame length, using current data frame as the first frame of the Frame of polymerization, current data frame is polymerized to
The Frame of polymerization.When the frame length of current data frame is more than the polymerization frame length for determining, by current data frame point
At least two Frame pieces are segmented into, and at least two Frame pieces are polymerized to into the Frame of at least two polymerizations；
Each Frame includes at least one Frame piece in the Frame of at least two polymerizations, at least two polymerizations
Include the Frame that at least one frame length is equal to the polymerization frame length for determining in Frame.
When the Frame of polymerization of the do not send and frame length less than the polymerization frame length for determining is detected the presence of, sentence
Whether the frame length of disconnected current data frame is more than remaining frame length；The polymerization frame length of a length of determination of residue frame deducts presence
Polymerization Frame frame length.
When the frame length of the current data frame that need to be sent is less than or equal to remaining frame length, by current data frame aggregation
To in the Frame of the polymerization for existing.
When the frame length of the current data frame that need to be sent is more than remaining frame length, current data frame is divided at least
Two Frame pieces, and at least one Frame piece is aggregated in the Frame of the polymerization of presence, Zhi Daocun
The frame length of Frame of polymerization reach the polymerization frame length of determination, and remaining Frame piece is polymerized to
The Frame of at least one polymerization.
Step 104, the Frame that polymerization is sent to receiving terminal.
Optionally, step 104 is specifically included：When the frame length of the Frame of polymerization is equal to the polymerization frame length for determining
When, send terminal to the Frame that receiving terminal sends polymerization.Determine when the frame length of the Frame of polymerization is less than
Polymerization frame length and the first frame from the Frame of polymerization when beginning to pass through scheduled duration, send terminal
The Frame of polymerization is sent to receiving terminal.
Optionally, when the Frame of polymerization is sent, sending terminal can adjust according to predetermined modulation system
The Frame of system polymerization, and send the Frame of modulation to receiving terminal.Sending terminal can also first advance
In the quality of the channel of foundation and the corresponding relation of modulation system, it is determined that the corresponding tune of quality of the channel for obtaining
Mode processed；Then according to the modulation system for determining, modulates the Frame of polymerization, then tune is sent to receiving terminal
The Frame of system.
In the embodiment of the present invention, the quality of channel of the terminal by obtaining and between receiving terminal is sent；According to
The quality of the channel of acquisition, it is determined that polymerization frame length；According to the polymerization frame length for determining, be polymerized the data that need to be sent
Frame；The frame length of the Frame of polymerization is less than or equal to the polymerization frame length for determining；Polymerization is sent to receiving terminal
Frame.Due to be polymerized frame length be to be determined according to the quality of channel, then, channel quality compared with
When good, it is determined that polymerization frame length can be with long；Channel it is second-rate when, it is determined that polymerization frame length can
With relatively shorter.So, when sending the Frame of polymerization to receiving terminal, when the quality of channel is preferable, by
Long in polymerization frame length, when a number of data are sent, the number of data frames of the polymerization of transmission is less,
Some control overheads are saved, therefore channel resource can be made full use of, improve throughput of system.In channel
It is second-rate when, due to be polymerized frame length it is shorter, it can be ensured that receiving terminal can receive the data of polymerization
Frame, reduces Frame retransmission probability, alleviates system burden, so as to improve throughput of system.To sum up,
Ensure that in the case of the quality real-time change of channel, be capable of the frame length of dynamic change polymerization, so as to reality
Smooth, in real time and efficiently wirelessly transmitting data frame is showed.
A kind of flow chart of Frame radio transmitting method that Fig. 2 is provided for second embodiment of the invention.At this
In inventive embodiments, first embodiment will be described in detail.As shown in Fig. 2 the method is including as follows
Step.
Step 201, send terminal to receiving terminal send request send (Request To Send, abbreviation RTS)
Frame.
Wherein, the RTS frames are used for request to receiving terminal transmission data.
Optionally, the RTS frames carry configured information and designated symbols.The configured information is used to indicate to receive eventually
Hold and the quality for sending the channel between terminal and receiving terminal is estimated according to designated symbols.
Optionally, the quality of channel includes signal to noise ratio.
Table 1 shows the form of RTS frames.As shown in table 1, RTS frames include control field (2 bytes)
With designated symbols field (12 bytes).Control field carries configured information, it is intended that sign field is carried specifies
Symbol.
Table 1
| Type | Control | Destination address | Source address | Designated symbols | Verification |
When realizing, the modulation system for sending terminal transmission RTS frame employings can be that multi-system digit phase is adjusted
System (Multiple Phase Shift Keying, abbreviation MPSK) mode.
When realizing, send terminal to receiving terminal and send before RTS frames, can first intercept channel.If
Channel idle, then random back for a period of time, then to receiving terminal send RTS frames.Random backoff mechanism
Window size avoidance mechanism can be based on using 802.11n.
Step 202, receiving terminal are received after RTS frames, are calculated according to the designated symbols that RTS frames are carried and are sent
The quality of the channel between terminal and receiving terminal.
Optionally, receiving terminal calculates signal to noise ratio according to equation below (2).
Wherein SNR be signal to noise ratio, rk=ak+nk, k=1,2 ..., L, akTo send the designated symbols that terminal sends,
nkFor the white complex gaussian noise of zero-mean, nkReal part and the variance of imaginary part be all σ2, L is default observation
The value of the length of data, such as L can be 10.Re (x) represents plural number x
Real part, e is natural constant, and j is imaginary unit, and M is order of modulation, i=0,1 ..., M-1.Modulation
Exponent number M is obtained with specific reference to modulation system.
The reasoning process of formula (2) is described below.
Assume that system equalization and synchronous remainder error are sufficiently small, the impact caused to signal-to-noise ratio (SNR) estimation can be neglected
Slightly disregard, and the matching that system has Nyquist shaping and accurate Timing Synchronization, such receiving terminal is filtered
The sampled signal (sampling frequency is symbol rate) that ripple device is exported in moment k can be expressed as：
rk=ak+nk, k=1,2 ..., L.
Due to：E|rk|2=E | ak|2+E|nk|2=E | ak|2+2σ2, it is therefore desirable to the signal to noise ratio snr of estimation can
To be expressed as formula (3).
For mpsk signal, akValue can be expressed as ai=Aej(2πi)/M, i=0,1 ..., M-1, then formula
(3) can represent such as formula (2).
Refer again to formula (2), it is only necessary to from observed value rkIn estimate the value of A and can be obtained by signal to noise ratio
SNR.In practical application, the Xiang Yaoyong seeking times mean value averaged in formula (2) is replacing.
Formula (4) can be obtained according to maximum-likelihood criterion.
In designated symbols akWhen known, with designated symbols akRelated log-likelihood function such as formula (5) is represented.
Symbol C is the constant term unrelated with A in formula (5).Log-likelihood function is taken in seek formula (5)
The A values of maximum, seek formula (5) partial derivative and are allowed to for 0, obtain formula (6).
Bring formula (6) into estimate that formula (2) obtains signal to noise ratio snr.
Step 203, receiving terminal broadcast clear to send (Clear To Send, abbreviation CTS) frame.
Optionally, CTS frames are used to allow to send terminal to receiving terminal transmission data.CTS frames are carried and received
The quality of the channel that terminal is calculated.
Table 2 shows the form of CTS frames.As shown in table 2, CTS frames include data field (6 bytes),
Data field carries the quality of the channel for calculating.
Table 2
| Type | Source address | Data | Verification |
When realizing, before receiving terminal broadcast CTS frames, channel can be first intercepted.If channel idle,
Then random back broadcasts for a period of time, then CTS frames.
Step 204, transmission terminal receive the quality of the channel for after CTS frames, carrying according to CTS frames, it is determined that
Polymerization frame length.
Optionally, send terminal and polymerization frame length MSL is calculated according to formula (1).
, according to the polymerization frame length for determining, be polymerized the Frame that need to be sent for step 205, transmission terminal.
Optionally, the frame length of the Frame of polymerization is less than or equal to the polymerization frame length for determining.
When realizing, the data frame transfer that need to be sent is given media intervention control (Media by the upper strata for sending terminal
Access Control, abbreviation MAC) layer, the Frame that MAC layer polymerization need to send.Upper strata is by multiple need
The Frame of transmission, form is Medium Access Control (MAC) Protocol Data Unit (MAC Protocol Data Unit, abbreviation MPDU)
Frame, is sequentially transferred to MAC layer.
MAC layer is received after first MPDU frame of upper layer transport, compares the frame length of first MPDU frame
With the polymerization frame length for determining.When the frame length of first MPDU frame is equal to the polymerization frame length for determining, directly will
First MPDU frame waits second MPDU frame to be received as the Frame being polymerized.
It is poly- with first MPDU frame when the frame length of first MPDU frame is less than the polymerization frame length for determining
First frame of the Frame of conjunction, by first MPDU frame aggregation to polymerization Frame in, and start this gather
The corresponding timer of Frame of conjunction.When a length of scheduled duration when timer is used to walk, when walking.Timer
Startup opportunity be that the length of the Frame being polymerized after the first frame of the Frame of polymerization is not up to true
Fixed polymerization frame length.
When the frame length of first MPDU frame is more than the polymerization frame length for determining, first MPDU frame is split
For at least two Frame pieces, and at least two Frame pieces are polymerized to into the Frame of at least two polymerizations.
Each Frame includes at least one Frame piece in the Frame of at least two polymerizations, at least two polymerizations
Include the Frame that at least one frame length is equal to the polymerization frame length for determining in Frame.
Optionally, first MPDU frame can be divided into two Frame pieces, one of Frame piece
Length be equal to determine polymerization frame length, this Frame piece by directly as one polymerization Frame.If
The length of another Frame piece is less than the polymerization frame length for determining, then with another Frame piece as another polymerization
Frame the first frame, another Frame piece is aggregated in the Frame of another polymerization, and started another
The corresponding timer of Frame of one polymerization.If the length of another Frame piece is still poly- more than what is determined
Close frame length, then it is similar with the mode of first MPDU frame of segmentation, then another Frame piece is divided into into two
Individual Frame piece is simultaneously polymerized.
MAC layer is received after second MPDU frame of upper layer transport, detects whether there is do not send and frame length
Less than the Frame of the polymerization of the polymerization frame length for determining.Specifically, MAC layer can detect whether timer arrives
Reach.If timer is not reached, show there is do not send and frame length gathering less than the polymerization frame length for determining
The Frame of conjunction.If timer is reached, show to there is no do not send and frame length less than the polymerization for determining
The Frame of the polymerization of frame length.
When the Frame that there is no polymerization of the do not send and frame length less than the polymerization frame length for determining is detected,
With reference to the mode of first MPDU frame of polymerization, be polymerized second MPDU frame, will not be described here.
When the Frame of polymerization of the do not send and frame length less than the polymerization frame length for determining is detected the presence of, sentence
Whether the frame length of disconnected second MPDU frame is more than remaining frame length.The polymerization frame length of a length of determination of residue frame is deducted
The frame length of the Frame of the polymerization of presence.The Frame of the polymerization of presence does not as send and frame length is less than true
The Frame of the polymerization of fixed polymerization frame length.
When the frame length of second MPDU frame is less than or equal to remaining frame length, by second MPDU frame aggregation
To in the Frame of the polymerization for existing.
When the frame length of second MPDU frame is more than remaining frame length, second MPDU frame is divided at least
Two Frame pieces, and at least one Frame piece is aggregated in the Frame of the polymerization of presence, Zhi Daocun
The frame length of Frame of polymerization reach the polymerization frame length of determination, and remaining Frame piece is polymerized to
The Frame of at least one polymerization.
Optionally, second MPDU frame can be divided into two Frame pieces, one of Frame piece
Length be equal to remaining frame length, this Frame piece will be aggregated in the Frame of the polymerization of presence.If another
The length of one Frame piece is then another polymerization with another Frame piece less than the polymerization frame length for determining
First frame of Frame, another Frame piece is aggregated in the Frame of another polymerization, and is started another
The corresponding timer of Frame of polymerization.If the length of another Frame piece is more than the polymerization frame length for determining,
It is then similar with the mode of second MPDU frame of segmentation, then another Frame piece is divided into into two Frames
Piece is simultaneously polymerized.
Similar, MAC layer is received after the follow-up MPDU frames of upper layer transport, according to polymerization second
The mode of MPDU frames is polymerized, and be will not be described here.
Fig. 3 shows the form of the Frame of polymerization.As shown in figure 3, the data frame packet of polymerization connects containing media
Enter to control frame head data (Media Access Control Header Data, abbreviation MAC HDR) field,
Data (English：DATA) field and frame check sequence (Frame Check Sequence, abbreviation FCS)
Field.
MAC HDR fields are used to carry control information, comprising synchronizing information, address information, Error Control letter
Breath etc..
DATA field is used to carry Frame.
FCS fields are used to carry checking information.
Specifically, DATA field can carry a Frame, and DATA field can also carry multiple data
Frame and/or Frame piece.When DATA field carries multiple Frames and/or Frame piece, adjacent data
Using separator (English between frame or Frame piece：Delimiter) separate.Refer again to Fig. 3, it is assumed that
DATA field carries N frame data frame and/or Frame piece.N is natural number.Each frame also includes in N frames
MAC HDR fields, DATA field and FCS fields.
Whether step 206, the frame length of the Frame for sending terminal judges polymerization are equal to the polymerization frame length for determining.
When the frame length of the Frame of polymerization is less than the polymerization frame length for determining, execution step 207.When the number of polymerization
When being equal to the polymerization frame length for determining according to the frame length of frame, execution step 208.
Optionally, send terminal to be often polymerized a MPDU frame, whether be judged as the frame length of Frame that is polymerized
Equal to the polymerization frame length for determining.
Whether step 207, transmission terminal detect from the first frame of the Frame of polymerization and start through pre- timing
It is long.
When the first frame of the Frame from polymerization begins to pass through scheduled duration, execution step 208.When from
When first frame of the Frame of polymerization starts without scheduled duration, execution step 206.
When realizing, sending terminal can detect whether timer reaches.If timer is not reached, table
First frame of the bright Frame from polymerization starts without scheduled duration.If timer is reached, table
First frame of the bright Frame from polymerization begins to pass through scheduled duration.
Step 208, send terminal in the quality of the channel for pre-building and the corresponding relation of modulation system, really
The corresponding modulation system of quality of the fixed channel for obtaining.
Optionally, the quality of the channel for pre-building is as shown in table 3 with the corresponding relation of modulation system.Work as letter
Make an uproar and compare SNR>During 30dB, corresponding modulation system is 64 quadrature amplitude modulations (Quadrature Amplitude
Modulation, abbreviation QAM)；Work as 20dB<SNR<During 30dB, corresponding modulation system is 16QAM；
Work as 10dB<SNR<During 20dB, corresponding modulation system is QPSK (Quadrature Phase Shift
Keyin, abbreviation QPSK)；As -3dB<SNR<During 10dB, corresponding modulation system is binary phase-shift key
Control (Binary Phase Shift Keying, abbreviation BPSK).When realizing, when signal to noise ratio snr is less than -3dB
When, the Frame of polymerization can not be sent, and cue is of poor quality.
Table 3
| Signal to noise ratio | Modulation system |
| SNR>30dB | 64QAM |
| 20dB<SNR<30dB | 16QAM |
| 10dB<SNR<20dB | QPSK |
| -3dB<SNR<10dB | BPSK |
Step 209, transmission terminal modulate the Frame of polymerization according to the modulation system for determining.
Optionally, the Frame of the physical layer modulation polymerization of terminal is sent.
Step 210, the Frame for sending terminal to receiving terminal transmission modulation.
Receiving terminal is received after the Frame for sending the modulation that terminal sends, first in the matter of the channel for pre-building
In the corresponding relation of amount and modulation system, it is determined that the corresponding modulation system of quality of the channel for obtaining；Further according to
It is determined that modulation system demodulation receive modulation Frame.
In embodiments of the present invention, by the quality according to channel, modulation system is determined, in such manner, it is possible to dynamic
State ground selects most suitable modulation system according to the quality of channel, so as to lift the efficiency of transmission of Frame.
A kind of structural representation of Frame radio transmitting device that Fig. 4 is provided for third embodiment of the invention.
The device may be mounted in transmission terminal, it is possible to provide suitable for first embodiment or second embodiment
Method.In embodiments of the present invention, with first embodiment or the same or analogous content of second embodiment, tool
Body refer to first embodiment or second embodiment, will not be described here.As shown in figure 4, the device includes
Acquisition module 401, determining module 402, aggregation module 403 and sending module 404.
Acquisition module 401, for the quality of the channel between acquisition and receiving terminal.
Determining module 402, the quality of the channel for being obtained according to acquisition module 401, it is determined that polymerization frame length.
Aggregation module 403, for the polymerization frame length determined according to determining module 402, aggregation module 403 is polymerized
The Frame that need to be sent；The frame length of the Frame of polymerization is less than or equal to the polymerization frame length for determining.
Sending module 404, for sending the Frame of the polymerization of aggregation module 403 to receiving terminal.
In the embodiment of the present invention, by the quality of the channel between acquisition and receiving terminal；According to the letter for obtaining
The quality in road, it is determined that polymerization frame length；According to the polymerization frame length for determining, be polymerized the Frame that need to be sent；Polymerization
Frame frame length less than or equal to determine polymerization frame length；The Frame of polymerization is sent to receiving terminal.
Due to being polymerized, frame length is determined according to the quality of channel, then, when the quality of channel is preferable, really
Fixed polymerization frame length can be with long；Channel it is second-rate when, it is determined that polymerization frame length can be shorter.
So, when sending the Frame of polymerization to receiving terminal, when the quality of channel is preferable, due to the frame length that is polymerized
Long, when a number of data are sent, the number of data frames of the polymerization of transmission is less, saves one
A little control overheads, therefore channel resource can be made full use of, improve throughput of system.Channel quality compared with
During difference, due to being polymerized, frame length is shorter, it can be ensured that receiving terminal can receive the Frame of polymerization, reduces
Frame retransmission probability, alleviates system burden, so as to improve throughput of system.To sum up, Neng Goubao
Card is capable of the frame length of dynamic change polymerization, it is achieved thereby that stream in the case of the quality real-time change of channel
Freely, in real time and efficiently wirelessly transmitting data frame.
A kind of structural representation of Frame radio transmitting device that Fig. 5 is provided for fourth embodiment of the invention.
In the present embodiment, the device that 3rd embodiment is provided will be described in detail.As shown in figure 5, the dress
Put including acquisition module 501, determining module 502, aggregation module 503 and sending module 504.
Optionally, determining module 502 calculates polymerization frame length according to formula (1).
Optionally, aggregation module 503 is used for：
When polymerization current data frame is prepared, detect whether to there is do not send and frame length less than the polymerization for determining
The Frame of the polymerization of frame length；
When the Frame that there is no polymerization of the do not send and frame length less than the polymerization frame length for determining is detected,
The frame length for comparing current data frame and the polymerization frame length for determining；When the frame length of current data frame is equal to the poly- of determination
When closing frame length, using current data frame as the Frame being polymerized；When the frame length of current data frame is less than determination
During polymerization frame length, with the first frame of Frame of the current data frame to be polymerized, current data frame is aggregated to poly-
In the Frame of conjunction；When the frame length of current data frame is more than the polymerization frame length for determining, by current data frame point
At least two Frame pieces are segmented into, and at least two Frame pieces are polymerized to into the Frame of at least two polymerizations；
Each Frame includes at least one Frame piece in the Frame of at least two polymerizations, at least two polymerizations
Include the Frame that at least one frame length is equal to the polymerization frame length for determining in Frame；
When the Frame of polymerization of the do not send and frame length less than the polymerization frame length for determining is detected the presence of, sentence
Whether the frame length of disconnected current data frame is more than remaining frame length；The polymerization frame length of a length of determination of residue frame deducts presence
Polymerization Frame frame length；
When the frame length of the current data frame that need to be sent is less than or equal to remaining frame length, by current data frame aggregation
To in the Frame of the polymerization for existing；
When the frame length of the current data frame that need to be sent is more than remaining frame length, current data frame is divided at least
Two Frame pieces, and at least one Frame piece is aggregated in the Frame of the polymerization of presence, Zhi Daocun
The frame length of Frame of polymerization reach the polymerization frame length of determination, and remaining Frame piece is polymerized to
The Frame of at least one polymerization.
Optionally, sending module 504 includes：
Determining unit 5041, in the quality of the channel for pre-building and the corresponding relation of modulation system,
It is determined that the corresponding modulation system of quality of the channel for obtaining.
Modulating unit 5042, for the modulation system determined according to determining unit 5041, modulates the data of polymerization
Frame.
Transmitting element 5043, for sending the Frame of the modulation of modulating unit 5042 to receiving terminal.
Optionally, receiver module 501 is used for：Receive transmission terminal and receiving terminal that receiving terminal sends it
Between channel quality, the quality of the channel is receiving terminal according to sending the designated symbols estimation that terminal sends
Out.
In embodiments of the present invention, by the quality according to channel, modulation system is determined, in such manner, it is possible to dynamic
State ground selects most suitable modulation system according to the quality of channel, so as to lift the efficiency of transmission of Frame.
It should be noted that：The Frame radio transmitting device that above-described embodiment is provided is in wirelessly transmitting data frame
When, only it is illustrated with the division of above-mentioned each functional module, in practical application, can be as desired
Above-mentioned functions distribution is completed by different functional modules, will the internal structure of equipment be divided into different work(
Energy module, to complete all or part of function described above.In addition, the data that above-described embodiment is provided
Frame radio transmitting device belongs to same design with Frame radio transmitting method embodiment, and it implements process
Embodiment of the method is referred to, is repeated no more here.
One of ordinary skill in the art will appreciate that realize all or part of step of above-described embodiment can pass through
Hardware is completing, it is also possible to which the hardware that correlation is instructed by program is completed, and described program can be stored in
In a kind of computer-readable recording medium, storage medium mentioned above can be read-only storage, disk or
CD etc..
Presently preferred embodiments of the present invention is the foregoing is only, it is all the present invention's not to limit the present invention
Within spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in the present invention's
Within protection domain.
Claims (10)
1. a kind of Frame radio transmitting method, it is characterised in that methods described includes：
Send the quality of the channel between terminal acquisition and receiving terminal；
According to the quality of the channel for obtaining, it is determined that polymerization frame length；
According to the polymerization frame length for determining, be polymerized the Frame that need to be sent；The frame length of the Frame of polymerization be less than or
Equal to the polymerization frame length of the determination；
The Frame of the polymerization is sent to the receiving terminal.
2. method according to claim 1, it is characterised in that the polymerization is calculated according to equation below
Frame length：
MSL is the polymerization frame length, and SNR is the numerical value of the quality of the channel.
3. method according to claim 1, it is characterised in that described according to the polymerization frame length for determining,
The Frame that polymerization need to send, including：
When polymerization current data frame is prepared, detect whether to there is do not send and frame length less than the polymerization for determining
The Frame of the polymerization of frame length；
When the Frame that there is no polymerization of the do not send and frame length less than the polymerization frame length for determining is detected,
The frame length of the comparison current data frame and the polymerization frame length of the determination；When the frame length of the current data frame
Equal to the determination polymerization frame length when, using the current data frame as polymerization Frame；Work as when described
When the frame length of front Frame is less than the polymerization frame length of the determination, with the current data frame as the data of polymerization
First frame of frame, the current data frame is aggregated in the Frame of the polymerization；When the current data
When the frame length of frame is more than the polymerization frame length of the determination, the current data frame is divided into at least two data
Frame piece, and at least two Frames piece is polymerized to into the Frame of at least two polymerizations；Described at least two
Each Frame includes Frame piece described at least one, at least two polymerization in the Frame of individual polymerization
Frame in include at least one frame length be equal to determine polymerization frame length Frame；
When the Frame of polymerization of the do not send and frame length less than the polymerization frame length for determining is detected the presence of, sentence
Whether the frame length of the current data frame of breaking is more than remaining frame length；The polymerization of a length of determination of the residue frame
Frame length deducts the frame length of the Frame of the polymerization of presence；
When the frame length of the current data frame is less than or equal to the remaining frame length, by the current data frame
In being aggregated to the Frame of the polymerization of presence；
When the frame length of the current data frame is more than the remaining frame length, the current data frame is divided into
At least two Frame pieces, and Frame piece described at least one is aggregated to the data of the polymerization of the presence
In frame, until the frame length of the Frame of the polymerization of the presence reaches the polymerization frame length of the determination, and will
Remaining Frame piece is polymerized to the Frame of at least one polymerization.
4. method according to claim 1, it is characterised in that send described poly- to the receiving terminal
The Frame of conjunction, including：
In the quality of the channel for pre-building and the corresponding relation of modulation system, it is determined that the matter of the channel for obtaining
Measure corresponding modulation system；
According to the modulation system for determining, the Frame of the polymerization is modulated；
The Frame of modulation is sent to the receiving terminal.
5. method according to any one of claim 1 to 4, it is characterised in that the acquisition with connect
The quality of the channel between terminal is received, including：
Receive the matter of the channel between the transmission terminal and the receiving terminal of the receiving terminal transmission
Amount, the quality of the channel is that the receiving terminal is estimated according to the designated symbols that the transmission terminal sends
Come.
6. a kind of Frame radio transmitting device, it is characterised in that described device includes：
Acquisition module, for the quality of the channel between acquisition and receiving terminal；
Determining module, the quality of the channel for being obtained according to the acquisition module, it is determined that polymerization frame length；
Aggregation module, for the polymerization frame length determined according to the determining module, be polymerized the Frame that need to be sent；
Polymerization frame length of the frame length of the Frame of the aggregation module polymerization less than or equal to the determination；
Sending module, for sending the Frame of the aggregation module polymerization to the receiving terminal.
7. device according to claim 6, it is characterised in that the determining module is according to equation below
Calculate the polymerization frame length：
MSL is the polymerization frame length, and SNR is the numerical value of the quality of the channel.
8. device according to claim 6, it is characterised in that the aggregation module is used for：
When polymerization current data frame is prepared, detect whether to there is do not send and frame length less than the polymerization for determining
The Frame of the polymerization of frame length；
When the Frame that there is no polymerization of the do not send and frame length less than the polymerization frame length for determining is detected,
The frame length of the comparison current data frame and the polymerization frame length of the determination；When the frame length of the current data frame
Equal to the determination polymerization frame length when, using the current data frame as polymerization Frame；Work as when described
When the frame length of front Frame is less than the polymerization frame length of the determination, with the current data frame as the data of polymerization
First frame of frame, the current data frame is aggregated in the Frame of the polymerization；When the current data
When the frame length of frame is more than the polymerization frame length of the determination, the current data frame is divided into at least two data
Frame piece, and at least two Frames piece is polymerized to into the Frame of at least two polymerizations；Described at least two
Each Frame includes Frame piece described at least one, at least two polymerization in the Frame of individual polymerization
Frame in include at least one frame length be equal to determine polymerization frame length Frame；
When the Frame of polymerization of the do not send and frame length less than the polymerization frame length for determining is detected the presence of, sentence
Whether the frame length of the current data frame of breaking is more than remaining frame length；The polymerization of a length of determination of the residue frame
Frame length deducts the frame length of the Frame of the polymerization of presence；
When the frame length of the current data frame is less than or equal to the remaining frame length, by the current data frame
In being aggregated to the Frame of the polymerization of presence；
When the frame length of the current data frame is more than the remaining frame length, the current data frame is divided into
At least two Frame pieces, and Frame piece described at least one is aggregated to the data of the polymerization of the presence
In frame, until the frame length of the Frame of the polymerization of the presence reaches the polymerization frame length of the determination, and will
Remaining Frame piece is polymerized to the Frame of at least one polymerization.
9. device according to claim 6, it is characterised in that the sending module includes：
Determining unit, in the quality of the channel for pre-building and the corresponding relation of modulation system, it is determined that
The corresponding modulation system of quality of the channel of acquisition；
Modulating unit, for the modulation system determined according to the determining unit, modulates the data of the polymerization
Frame；
Transmitting element, for sending the Frame of the modulating unit modulation to the receiving terminal.
10. the device according to any one of claim 6 to 9, it is characterised in that the acquisition mould
Block is used for：
Receive the matter of the channel between the transmission terminal and the receiving terminal of the receiving terminal transmission
Amount, the quality of the channel is that the receiving terminal is estimated according to the designated symbols that the transmission terminal sends
Come.
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| CN110730475A (en) * | 2019-09-29 | 2020-01-24 | 中科睿微(宁波)电子技术有限公司 | Two-stage aggregation retransmission method, equipment and storage medium |
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