CN106471785A - A kind of virtual carrier sensing method and device - Google Patents

A kind of virtual carrier sensing method and device Download PDF

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Publication number
CN106471785A
CN106471785A CN201480080356.9A CN201480080356A CN106471785A CN 106471785 A CN106471785 A CN 106471785A CN 201480080356 A CN201480080356 A CN 201480080356A CN 106471785 A CN106471785 A CN 106471785A
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CN
China
Prior art keywords
field
duration
transmission frame
includes
check value
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CN201480080356.9A
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Chinese (zh)
Inventor
杜振国
丁志明
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华为技术有限公司
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Priority to PCT/CN2014/092624 priority Critical patent/WO2016082230A1/en
Publication of CN106471785A publication Critical patent/CN106471785A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/02Communication control; Communication processing
    • H04L29/06Communication control; Communication processing characterised by a protocol

Abstract

A kind of virtual carrier sensing method and device, wherein, the method includes:Receive transmission frame, transmission frame includes service field and Duration field, wherein, service field includes check field, the first check value is carried in check field, first check value be the second check value be carried in check field through wireless channel transmission after obtain, the second check value be send transmission frame wireless device generate transmission frame when calculated by pre-defined algorithm according to sets of fields;Wherein, sets of fields is the part field in the field that transmission frame includes, and sets of fields includes Duration field;Duration field includes the persistent period (S101);Determine according to the first check value whether the persistent period is effective persistent period (S102);When determining that the persistent period is effective persistent period, update the network allocation vector timer (S103) of local terminal using the persistent period.The method can improve virtual carrier sensing in wireless network communication reliability.

Description

A kind of virtual carrier sensing method and device Technical field

The present invention relates to field of communication technology more particularly to a kind of virtual carrier sensing methods and device.

Background technique

Virtual carrier sensing in wireless network communication (Virtual Carrier Sense; it VCS) is a kind of important transmission protection mechanism in Institute of Electrical and Electric Engineers (Institute of Electrical and Electronics Engineers, IEEE) 802.11 standards.In VCS mechanism, data are transmitted in the form of transmission frame, transmission frame includes physical header and data, data include service (SERVICE) field and physical layer convergence process services data cell (Physical Layer Convergence Procedure Service Data Unit, PSDU).PSDU is media access control (Media Access Control, MAC) layer data, including mac frame head, frame and Frame Check Sequence (Frame Check Sequence, FCS).Mac frame head includes Duration field, is used to indicate the expection remaining time that transmission between source wireless device and purpose wireless device includes the data of transmission frame.

At present, common virtual carrier sensing method are as follows: when transmission frame is transmitted by a wireless channel to purpose wireless device from source wireless device, all the elements that the transmission frame includes are likely to be received using other wireless devices of same wireless channel with the two wireless devices, judge whether the transmission frame is valid frame using FCS later, when the transmission frame is valid frame, according to the Duration field that the transmission frame includes, network allocation vector (Network Allocation Vector, NAV) timer is set.Before NAV counter decrements are zero, even if these wireless devices listen to the wireless channel free time, also data can not be sent by the wireless channel, to avoid to just interfering in the wireless device of the wireless channel transmitting data.

In the above-mentioned methods, when transmission frame is invalid frame, NAV timer can not be arranged according to the duration in these equipment, will send data in the wireless channel, so that multiple wireless devices occur in same wireless channel of same time while sending data, virtual carrier sensing in wireless network communication reliability is reduced.

Summary of the invention

The embodiment of the invention discloses a kind of virtual carrier sensing method and devices, for improving virtual carrier sensing in wireless network communication reliability.

First aspect of the embodiment of the present invention discloses a kind of virtual carrier sensing method, comprising:

Receive transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, the first check value is carried in the check field, first check value is that the second check value is carried in the check field and obtains after wireless channel transmits, and second check value is to send when the wireless device of the transmission frame generates the transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, the sets of fields is the part field in field that the transmission frame includes, and the sets of fields includes the Duration field;The Duration field includes the duration;

Determine whether the duration is effective duration according to first check value;

When determining the duration is effective duration, the NAV timer of local terminal is updated using the duration.

It is described to determine whether the duration is effective duration according to first check value in conjunction with the embodiment of the present invention in a first aspect, in the first possible implementation of first aspect of the embodiment of the present invention, comprising:

Third check value is calculated by the pre-defined algorithm according to the sets of fields;

When first check value is matched with the third check value, determine that the duration is effective duration.

In conjunction with the possible implementation of the first of first aspect of the embodiment of the present invention or first aspect of the embodiment of the present invention, in second of possible implementation of first aspect of the embodiment of the present invention, the transmission frame further includes destination address field, the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field;

It is described when determine the duration be effective duration when, using the duration update local terminal NAV timer include:

When determining that the duration is effective duration, the reception address is effective reception address according to first check value, if address and the address of local terminal of receiving mismatches, and the duration is greater than the time of the NAV timer of local terminal, and the NAV timer of local terminal is updated using the duration.

In conjunction with second of possible implementation of first aspect of the embodiment of the present invention, in the third possible implementation of first aspect of the embodiment of the present invention, the transmission frame further includes physical header, the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.

Second aspect of the embodiment of the present invention discloses a kind of virtual carrier sensing method, comprising:

Generate transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, the second check value is carried in the check field, second check value is calculated according to sets of fields by pre-defined algorithm, and the sets of fields is the part field in the field that the transmission frame includes, the sets of fields includes the Duration field, and the Duration field includes the duration;

Send the transmission frame, so that the wireless device for receiving the transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the network allocation vector timer of the wireless device is updated using the duration, wherein, first check value is that second check value is carried in the check field and obtains after wireless channel transmits.

In conjunction with second aspect of the embodiment of the present invention, in the first possible implementation of second aspect of the embodiment of the present invention, the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field.

In conjunction with the first possible implementation of second aspect of the embodiment of the present invention, in second of possible implementation of second aspect of the embodiment of the present invention, the transmission frame further includes physical header, the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.

The third aspect of the embodiment of the present invention discloses a kind of wireless device, comprising:

Receiving unit, for receiving transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, carry the first check value in the check field, first check value is that the second check value is carried in the check field and obtains after wireless channel transmits, and second check value is to send when the wireless device of the transmission frame generates the transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, the sets of fields is the part field in field that the transmission frame includes, and the sets of fields includes the Duration field;The Duration field includes the duration;

Judging unit, the first check value for including according to the received transmission frame of the receiving unit determine whether the duration is effective duration;

Updating unit, for updating the NAV timer of the wireless device using the duration when the judging unit determines that the duration is effective duration.

In conjunction with the third aspect of the embodiment of the present invention, in the first possible implementation of the third aspect of the embodiment of the present invention, the judging unit is specifically used for:

Third check value is calculated by the pre-defined algorithm according to the sets of fields;

When first check value is matched with the third check value, determine that the duration is effective duration.

In conjunction with the possible implementation of the first of the third aspect of the embodiment of the present invention or the third aspect of the embodiment of the present invention, in second of possible implementation of the third aspect of the embodiment of the present invention, the transmission frame further includes destination address field, the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field;

The updating unit, specifically for when determining that the duration is effective duration, the reception address is effective reception address according to first check value, if address and the address of the wireless device of receiving mismatches, and the duration is greater than the time of the NAV timer of the wireless device, then the NAV timer of the wireless device is updated using the duration.

In conjunction with second of possible implementation of the third aspect of the embodiment of the present invention, in the third possible implementation of the third aspect of the embodiment of the present invention, the transmission frame further includes physical header, the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.

Fourth aspect of the embodiment of the present invention discloses a kind of wireless device, including processor, memory and input unit, in which:

The input unit, for receiving transmission frame and being sent to the processor, the transmission frame includes service field and Duration field, wherein, the service field includes check field, the first check value is carried in the check field, first check value is that the second check value is carried in the check field and obtains after wireless channel transmits, and second check value is to send when the wireless device of the transmission frame generates the transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, the sets of fields is the part field in field that the transmission frame includes, and the sets of fields includes the Duration field;The Duration field includes the duration;

Batch processing code is stored in the memory, the processor is for calling the program code stored in the memory to execute following operation:

Determine whether the duration is effective duration according to first check value;

When determining the duration is effective duration, the NAV timer of the wireless device is updated using the duration.

In conjunction with fourth aspect of the embodiment of the present invention, in the first possible implementation of fourth aspect of the embodiment of the present invention, the processor be used for determined according to first check value duration whether be effective duration mode specifically:

The processor is used to that third check value to be calculated by the pre-defined algorithm according to the sets of fields;

When first check value is matched with the third check value, determine that the duration is effective duration.

In conjunction with the possible implementation of the first of fourth aspect of the embodiment of the present invention or fourth aspect of the embodiment of the present invention, in second of possible implementation of fourth aspect of the embodiment of the present invention, the transmission frame further includes destination address field, the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field;

The processor is used for when determining the duration is effective duration, in the way of the NAV timer of duration update local terminal specifically:

The processor is used for when determining that the duration is effective duration, the reception address is effective reception address according to first check value, if address and the address of the wireless device of receiving mismatches, and the duration is greater than the time of the NAV timer of the wireless device, then the NAV timer of the wireless device is updated using the duration.

In conjunction with second of possible implementation of fourth aspect of the embodiment of the present invention, in the third possible implementation of fourth aspect of the embodiment of the present invention, the transmission frame further includes physical header, the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.

The 5th aspect of the embodiment of the present invention discloses a kind of wireless device, comprising:

Generation unit, for generating transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, and the second check value is carried in the check field, second check value is calculated according to sets of fields by pre-defined algorithm, the sets of fields is the part field in the field that the transmission frame includes, and the sets of fields includes the Duration field, and the Duration field includes the duration;

Transmission unit, the transmission frame generated for sending the generation unit, so that the targeted wireless device for receiving the transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the Target Wireless is updated using the duration and is set Standby network allocation vector timer, wherein first check value is that second check value is carried in the check field and obtains after wireless channel transmits.

In conjunction with the 5th aspect of the embodiment of the present invention, in the first possible implementation of the 5th aspect of the embodiment of the present invention, the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field.

In conjunction with the first possible implementation of the 5th aspect of the embodiment of the present invention, in second of possible implementation of the 5th aspect of the embodiment of the present invention, the transmission frame further includes physical header, the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.

The 6th aspect of the embodiment of the present invention discloses a kind of wireless device, including processor, memory and output device, in which:

Batch processing code is stored in the memory, the processor is for calling the program code stored in the memory to execute following operation:

Generate transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, the second check value is carried in the check field, second check value is calculated according to sets of fields by pre-defined algorithm, and the sets of fields is the part field in the field that the transmission frame includes, the sets of fields includes the Duration field, and the Duration field includes the duration;

The output device, for sending the transmission frame, so that the targeted wireless device for receiving the transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the network allocation vector timer of the targeted wireless device is updated using the duration, wherein, first check value is that second check value is carried in the check field and obtains after wireless channel transmits.

In conjunction with the 6th aspect of the embodiment of the present invention, in the first possible implementation of the 6th aspect of the embodiment of the present invention, the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field.

In conjunction with the first possible implementation of the 6th aspect of the embodiment of the present invention, in second of possible implementation of the 6th aspect of the embodiment of the present invention, the transmission frame further includes physical header, the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.

In existing method, wireless device only when received transmission frame is valid frame, just utilizes the duration Update the NAV timer of local terminal;When received transmission frame is invalid frame, NAV timer can not be arranged according to the duration in the wireless device, data will be sent in the wireless channel reduces virtual carrier sensing in wireless network communication reliability so that multiple wireless devices occur in same wireless channel of same time while sending data.In virtual carrier sensing method provided in an embodiment of the present invention, by including check field in the service field of transmission frame, determine whether the duration that received transmission frame includes is effective duration according to the first check value carried in the check field, no matter whether received transmission frame is valid frame, it does not need to judge whether the transmission frame is valid frame using FCS to the entire frame of transmission frame, it only needs to verify the duration for including in transmission frame, when determining the duration for including in transmission frame is effective duration, the NAV timer of local terminal can be updated using the duration, so that local terminal does not send data before the time of NAV timer is decremented to zero, avoid the case where occurring multiple wireless devices in same wireless channel of same time while sending data, so as to improve virtual load Wave listens to reliability.

Detailed description of the invention

To describe the technical solutions in the embodiments of the present invention more clearly, the drawings to be used in the embodiments are briefly described below, apparently, drawings in the following description are some embodiments of the invention, for those of ordinary skill in the art, without any creative labor, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is a kind of flow chart of virtual carrier sensing method disclosed by the embodiments of the present invention;

Fig. 2 is the process disclosed by the embodiments of the present invention that check value is carried using scrambling code generator;

Fig. 3 is that another virtual carrier sensing method disclosed by the embodiments of the present invention is flow chart;

Fig. 4 is a kind of flow chart of mac frame head compression method disclosed by the embodiments of the present invention;

Fig. 5 is the flow chart of another mac frame head compression method disclosed by the embodiments of the present invention;

Fig. 6 is a kind of structure chart of wireless device disclosed by the embodiments of the present invention;

Fig. 7 is the structure chart of another wireless device disclosed by the embodiments of the present invention;

Fig. 8 is the structure chart of another wireless device disclosed by the embodiments of the present invention;

Fig. 9 is the structure chart of another wireless device disclosed by the embodiments of the present invention;

Figure 10 is the structure chart of another wireless device disclosed by the embodiments of the present invention;

Figure 11 is the structure chart of another wireless device disclosed by the embodiments of the present invention;

Figure 12 is the structure chart of another wireless device disclosed by the embodiments of the present invention;

Figure 13 is the structure chart of another wireless device disclosed by the embodiments of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical scheme in the embodiment of the invention is clearly and completely described, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a kind of virtual carrier sensing method and devices, for improving virtual carrier sensing in wireless network communication reliability.It is described in detail separately below.

Due to the unreliability of wireless channel, the transmission of transmission frame may malfunction, and the transmission content frame for causing receiving end to receive is different from the content that transmitting terminal generates.In the prior art, the transmission frame correctness received to enable receiving end to know, transmitting terminal increase additional verification data in transmission frame, i.e., transmission content frame are inputted predetermined checking algorithm, it obtains and sends check value, then carry and sent in the frame check field in transmission frame.After receiving end receives transmission frame, transmission content frame is calculated using checking algorithm identical with receiving end, obtains and receives check value, be then compared it with the transmission check value obtained from the transmission frame received.If the two matches, then it is assumed that transmission frame content reception is correct, i.e., the transmission frame is valid frame;If mismatching, illustrate that transmit content frame malfunctions in transmission process, or send check value loading error occurring, i.e., the transmission frame is invalid frame, at this point, receiving end abandons the transmission frame.

Because the mistake caused by wireless channel is unreliable possibly is present at any position in transmission frame.When equipment receives an invalid transmission frame (when i.e. frame check value matching result is mismatches), Duration field in transmission frame still is possible to be correct, at this time, the duration still can be used to the NAV timer that oneself is arranged in Duration field, but the frame is just abandoned when receiving an invalid transmission frame in the prior art, utilizes the still information of effective duration in the invalid transmission frame.Therefore, it is necessary to a kind of mechanism, even if so that receiving end under the transmission frame overall transfer error situation received, can also judge whether Duration field malfunctions in the transmission frame.

On the other hand, from the perspective of realization, since frame check field is located at the tail portion of frame, when equipment receives a transmission frame, and when determining that the frame does not need oneself reception according to the reception address field in frame head, the frame can be directly abandoned, the further part of transmission frame is received without being further continued for, to save energy.In this case, receiving device has no way of judging that Duration field receives correctness at all.If it receives mistake, use NAV timer, which is arranged, in it may cause unpredictable problem.Therefore, it is necessary in the case where wireless device only receives frame head, can accurate judgement Duration field whether receive correctly.

In conclusion need in transmission frame frame head and before position increase new check field, Duration field is verified.This method enables reception wireless device to can determine whether Duration field receives correctly in the case where only receiving portion transmission frame, so that NAV timer be made correctly to be arranged, and can save energy;Meanwhile even if in the case where receiving a failed transmission frame, receiving wireless device also can individually judge whether Duration field receives correctly, so that NAV timer be arranged using it.Compared to existing method, method provided in an embodiment of the present invention enables wireless device to obtain effective duration more often than not, to keep virtual carrier sense mechanism more efficient.

Referring to Fig. 1, Fig. 1 is a kind of flow chart of virtual carrier sensing method disclosed by the embodiments of the present invention.Wherein, virtual carrier sensing method shown in FIG. 1 is suitable for the wireless devices such as mobile phone, tablet computer.Virtual carrier sensing method shown in FIG. 1 is described from the angle of receiving side.As shown in Figure 1, the virtual carrier sensing method may comprise steps of.

S101, transmission frame is received, transmission frame includes service field and Duration field, wherein, service field includes check field, the first check value is carried in check field, first check value is that the second check value is carried in check field and obtains after wireless channel transmits, and the second check value is to send when the wireless device of transmission frame generates transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, sets of fields is the part field in field that transmission frame includes, and sets of fields includes Duration field;Duration field includes the duration.

In the present embodiment, the transmission frame received includes physical header and data, and data include service field, PSDU, tail (Tail) and filling (Pad).Wherein, in some cases, there is no tails and filling two parts in data.PSDU is MAC layer data, and PSDU includes mac frame head, frame and FCS, and mac frame head includes Duration field, and Duration field includes the duration.Service field includes check field, scrambling code generator initial value (Scrambler Initialization), wherein, the first check value is carried in check field, first check value is that the second check value is carried in check field and obtains after wireless channel transmits, and the second check value is to send when the wireless device of transmission frame generates transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, sets of fields is the part field in field that transmission frame includes, and sets of fields includes Duration field;Duration field includes the duration.Wherein, the first check value and the second check value can It can be equal, it is also possible to unequal;When the check field loading error occurring in transmission process, the two is unequal;When check field transmission is correct in transmission process, the two is equal.

In the present embodiment, service field can carry check value by basic skills or extended method.Basic skills are as follows: the length of service field is generally 16bits, wherein, 7bits is scrambling code generator initial value, information cannot be carried, therefore, check value can be carried with remaining 9bits, the method for carrying check value using 8bits in service field is had proposed in 802.11ac standard, but the check value is the check value of the VTH-SIG-B field in physical header, therefore, the check value of bits some or all of in remaining 9bits) carrying sets of fields (can be utilized using similar method, if necessary to carry the check value of the SIG field in physical header, then sets of fields will further include SIG field in physical header.The check value length the short more is also easy to produce erroneous judgement, therefore, extended method further increases check value length on the basis of basic skills, specifically: check value is implicitly carried by the scrambling code generator initial state value of transmission frame source wireless device, to increase check value length.

In the present embodiment, scrambling code generator initial value (Initialization) and initial state value (Initial State) concept that be two different.The former is the name of a subfield in SERVICE field, and length 7bits usually takes and takes 7bits full 0 sequence in fixed value, such as current 802.11 standard;The latter is the initial value of 7 bit shift registers in scrambling code generator, length 7bits, usual random value but cannot be full 0, for generating scrambler sequence.In actual transmissions, transmitting terminal is primarily based on 7bits initial state value and generates scrambler sequence, then xor operation is carried out respectively with the 7bits full 0 sequence of preceding 7bits and scrambling code generator initial value in scrambler sequence, send its result as the data after scrambling over the wireless channel;After receiving end receives the scrambled data, it is subjected to exclusive or with the 7bits full 0 sequence of scrambling code generator initial value again, to obtain the preceding 7bits of transmitting terminal scrambler sequence.According to the specific configuration of scrambling code generator, receiving end can be gone out transmitting terminal by this 7bits scrambler sequence reverse-direction derivation and generate used initial state value when the scrambler sequence, and then generation and the identical scrambler sequence of transmitting terminal, be descrambled for receiving end.Check information is carried using scrambling code generator initial state value, replace random value with check information, receiving end needs according to the initial value scrambling result received and obtains the initial state value (check information) of transmitting terminal in conjunction with scrambling code generator specific structure reverse-direction derivation, therefore belongs to implicit transmission.

For example, scrambling code generator is one 7 circulating registers, after giving 7 initial values, scrambler sequence that the exportable period is 127.In traditional mechanism, transmission frame source wireless device randomly chooses 7 binary sequences of a non-full 0 as scrambling code generator initial state value.And in extended method, 6 in 7 random sequences are replaced with 6 (X1~X6) in check value, remaining 1 perseverance is set to 1 (in order to guarantee 0) initial state value is not all.After other wireless devices receive transmission frame, can reverse push export this 7 initial state values, wherein 6 be test value content.6 bit check values (X1~X6) are implicitly carried by scrambling code generator initial state value in this method, in addition 9 (X7~X15) directly being carried by service field, then check value at most may include 15bits, and process is as shown in Figure 2.

In the present embodiment, when the source wireless device of transmission frame sends transmission frame, transmission frame will be received using other wireless devices of same wireless channel with the source wireless device.

S102, determine whether the duration is effective duration according to the first check value.

As a kind of possible embodiment, determined according to check value the duration whether be effective duration concrete mode are as follows:

Third check value is calculated by pre-defined algorithm according to sets of fields;

When the first check value is matched with third check value, determine that the duration is effective duration.

In the present embodiment, after receiving transmission frame, will determine whether the duration is effective duration, that is, calculates the third check value for the sets of fields that received transmission frame includes, judge whether the first check value matches with third check value according to the first check value.Wherein, only when check field and sets of fields are all transmitted correctly, the first check value can just be matched with third check value.Matching, can be equal, or have corresponding relationship, for example, after a side is negated it is equal with another party, it can be understood as two sides have corresponding relationship.

It illustrates, it is assumed that the first check value and third check value are all the values being directly calculated using pre-defined algorithm according to sets of fields, and the first check value is matched with third check value, i.e., the first check value is equal with third check value;Assuming that the first check value is the value after being negated using pre-defined algorithm according to the value that sets of fields is calculated, and third check value is the value being directly calculated using pre-defined algorithm according to sets of fields, first check value is matched with third check value, i.e., by the first check value it is negated value it is equal with third check value or by third check value it is negated be worth it is equal with the first check value.Wherein, pre-defined algorithm can be cyclic redundancy check (Cyclic Redundancy Code, CRC) algorithm.

S103, when determine the duration be effective duration when, utilize the duration update local terminal NAV timer.

In the present embodiment, when determine the duration be effective duration, when i.e. the first check value is matched with third check value, the NAV timer of local terminal is updated using the duration, set the time of NAV timer to the value of duration, so that local terminal does not send data before the time of NAV timer is decremented to zero, the data sent to avoid local terminal interfere the data transmitted in same wireless channel;Work as the duration When for the invalid duration, the NAV timer of local terminal will not updated.

As a kind of possible embodiment, transmission frame further includes destination address field, and destination address field includes the reception address of transmission frame, and sets of fields further includes destination address field;

When determining the duration is effective duration, in the way of the NAV timer of duration update local terminal specifically:

When the duration is the time of effective duration, the address mismatch of reception address and local terminal, and duration greater than the network allocation vector timer of local terminal, the duration is utilized to update the NAV timer of local terminal.

In the present embodiment, when transmission frame includes Duration field and destination address field, third check value is calculated by pre-defined algorithm according to sets of fields, i.e., third check value is calculated by pre-defined algorithm according to Duration field and destination address field.Therefore, when the first check value is matched with third check value, it may indicate that the duration is effective duration, and receiving address is effectively to receive address.When the first check value and third check value mismatch, it may indicate that the duration is the invalid duration, and/or, reception address is invalid receiver address.

In the present embodiment, when transmission frame includes the first check value, when duration and destination address field, after receiving transmission frame, it whether is effective duration first with the first check value verifying duration, whether destination address field is effective address field, it is effective duration when the duration, and destination address field be effective address field when, judge receive address whether the address matching with local terminal, (show that transmission frame is not destined to the transmission frame of local terminal) when the address for receiving address and local terminal mismatches, further judge whether the duration is greater than the time of the network allocation vector timer of local terminal, when the duration being greater than the time of the network allocation vector timer of local terminal, the NAV timer of local terminal is updated using the duration;When destination address field is invalid address field, show that Duration field is also invalid field, will work without the NAV timer of duration update local terminal;When destination address field is effective address field, and receives the address matching of address and local terminal, shows that transmission frame is destined to the transmission frame of local terminal, continue to other contents of transmission frame;When destination address field is the time of effective address field, the address mismatch of reception address and local terminal, and duration less than or equal to the network allocation vector timer of local terminal, the NAV timer of duration update local terminal will work without.Wherein, the address for the purpose wireless device that address is transmission frame is received.

In the present embodiment, the reception address that transmission frame includes can be unicast reception address, multicast reception address or broadcast reception address, and therefore, the address of local terminal and reception address matching include following situations: when reception ground When location is unicast reception address, when the address matching of unicast reception address and local terminal, shows the address of local terminal and receive address matching;When receiving address is multicast reception address, if in multicast group defined in multicast reception address including the address of local terminal, showing the address of local terminal and receiving address matching;It is broadcast reception address when receiving address, shows the address of local terminal and receive address matching.Other situations are accordingly to be regarded as the address of local terminal and receive address mismatch.

As a kind of possible embodiment, transmission frame further includes physical header, and physical header includes instruction information, and it includes check field that instruction information, which is used to indicate transmission frame,.

In the present embodiment, when transmission frame includes check field, duration, when destination address field and instruction information, after receiving transmission frame, judge whether transmission frame includes check field first with instruction information, when transmission frame includes check field, it whether will be effective address field using the first check value verifying destination address field, when destination address field is effective address field, judge receive address whether the address matching with local terminal, when the address for receiving address and local terminal mismatches, show that transmission frame is not destined to the transmission frame of local terminal, judge whether the duration is greater than the time of the network allocation vector timer of local terminal, when the duration being greater than the time of the network allocation vector timer of local terminal, the NAV timer of local terminal is updated using the duration;When transmission frame does not include check field, subsequent operation will not be executed;When transmission frame includes check field, and destination address field is invalid address field, show that Duration field is also invalid field, will work without the NAV timer of duration update local terminal;When transmission frame includes check field, destination address field is effective address field, and when the address matching of reception address and local terminal, shows that transmission frame is destined to the transmission frame of local terminal, continue to other contents of transmission frame;When transmission frame includes check field, destination address field is effective address field, the address for receiving address and local terminal mismatches, and when the duration is less than or equal to the time of the network allocation vector timer of local terminal, will work without the NAV timer that the duration updates local terminal.

In existing method, wireless device only when received transmission frame is valid frame, just updates the NAV timer of local terminal using the duration;When received transmission frame is invalid frame, NAV timer can not be arranged according to the duration in the wireless device, data will be sent in the wireless channel reduces virtual carrier sensing in wireless network communication reliability so that multiple wireless devices occur in same wireless channel of same time while sending data.In virtual carrier sensing method provided in an embodiment of the present invention, by including check field in the service field of transmission frame, determine whether the duration that received transmission frame includes is effective duration according to the first check value carried in the check field, no matter whether received transmission frame is valid frame, it does not need to judge whether the transmission frame is valid frame using FCS to the entire frame of transmission frame, it is only necessary to continue to include in transmission frame Time is verified, when determining the duration for including in transmission frame is effective duration, the NAV timer of local terminal can be updated using the duration, so that local terminal does not send data before the time of NAV timer is decremented to zero, the case where occurring multiple wireless devices in same wireless channel of same time while sending data is avoided, so as to improve virtual carrier sensing in wireless network communication reliability.

Referring to Fig. 3, Fig. 3 is the flow chart of another virtual carrier sensing method disclosed by the embodiments of the present invention.Wherein, virtual carrier sensing method shown in Fig. 3 is suitable for the wireless devices such as mobile phone, tablet computer.Virtual carrier sensing method shown in Fig. 3 is described from the angle of sending side, and correlation step can be understood with reference to foregoing teachings.As shown in figure 3, the virtual carrier sensing method may comprise steps of.

S301, transmission frame is generated, transmission frame includes service field and Duration field, wherein, service field includes check field, the second check value is carried in check field, the second check value is calculated according to sets of fields by pre-defined algorithm, and sets of fields is the part field in the field that transmission frame includes, sets of fields includes Duration field, and Duration field includes the duration.

In the present embodiment, service field can carry check value by basic skills or extended method.Basic skills are as follows: the length of service field is generally 16bits, wherein, 7bits is scrambling code generator initial value, information cannot be carried, therefore, check value can be carried with remaining 9bits, the method for carrying check value using 8bits in service field is had proposed in 802.11ac standard, but the check value is the check value of the VTH-SIG-B field in physical header, therefore, the check value of bits some or all of in remaining 9bits) carrying sets of fields (can be utilized using similar method, if necessary to carry the check value of the SIG field in physical header, then sets of fields will further include SIG field in physical header.The check value length the short more is also easy to produce erroneous judgement, therefore, extended method further increases check value length on the basis of basic skills, specifically: check value is implicitly carried by the scrambling code generator initial state value of transmission frame source wireless device, to increase check value length.

For example, scrambling code generator is one 7 circulating registers, after giving 7 initial values, scrambler sequence that the exportable period is 127.In traditional mechanism, transmission frame source wireless device randomly chooses 7 binary sequences of a non-full 0 as scrambling code generator initial state value.And in extended method, 6 in 7 random sequences are replaced with 6 (X1~X6) in check value, remaining 1 perseverance is set to 1 (in order to guarantee that initial state value is not all 0).After other wireless devices receive transmission frame, can reverse push export this 7 initial state values, wherein 6 be test value content.6 bit check values (X1~X6) are implicitly carried by scrambling code generator initial state value in this method, in addition 9 directly carried by service field (X7~X15), then check value at most may include 15bits, and process is as shown in Figure 2.

As a kind of possible embodiment, transmission frame further includes destination address field, and destination address field includes the reception address of transmission frame, and sets of fields further includes destination address field.

In the present embodiment, the reception address of transmission frame can be unicast address, broadcast address or multicast address.Wherein, the purpose wireless device address that address is transmission frame is received.

As a kind of possible embodiment, transmission frame further includes physical header, and physical header includes instruction information, and it includes check field that instruction information, which is used to indicate transmission frame,.

For example, showing that transmission frame includes check field when the value of the instruction information in physical header is 1, when the value for indicating information is 0, show that transmission frame does not include check field.

S302, transmission frame is sent, so that the wireless device for receiving transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the network allocation vector timer of the wireless device is updated using the duration, wherein, the first check value is that the second check value is carried in check field and obtains after wireless channel transmits.How the wireless device for receiving transmission frame determines whether the duration is that can understand with reference to the related content of foregoing embodiments effective duration according to the first check value.

In the present embodiment, after generation transmission frame, transmission frame is sent to and receives the corresponding wireless device in address, during transmission, due to the broadcast characteristic of wireless channel itself, it will be received by wireless device corresponding with address is received using other wireless devices of same wireless channel, so that these wireless devices determine whether the duration is effective duration using the first check value, when determining the duration is effective duration, their NAV timer will be updated using the duration, avoid the case where occurring multiple wireless devices in same wireless channel of same time while sending data.

In the virtual carrier sensing method described in Fig. 3, the transmission frame of generation includes check field, the second check value is carried in check field, after being received by wireless device corresponding with address is received using other wireless devices of same wireless channel, it whether will be effective duration using the first check value verifying duration, wherein, first check value is that the second check value is carried in check field and obtains after wireless channel transmits, when the duration is effective duration, their NAV timer will be updated using the duration, avoid the case where occurring multiple wireless devices in same wireless channel of same time while sending data, so as to improve virtual carrier sensing in wireless network communication reliability.

Referring to Fig. 4, Fig. 4 is a kind of process of mac frame head compression method disclosed by the embodiments of the present invention Figure.Wherein, mac frame head compression method shown in Fig. 4 is suitable for the wireless devices such as mobile phone, tablet computer.Mac frame head compression method shown in Fig. 4 is described from the angle of sending side.As shown in figure 4, the mac frame head compression method may comprise steps of.

S401, building transmission frame, transmission frame includes physical header, mac frame head and Frame Check Sequence, and mac frame head includes the type of transmission frame, the transmission direction of transmission frame and address field collection, physical header include be used to indicate transmission frame whether be compression transmission frame instruction information.

In the present embodiment, in 802.11 network of IEEE, there are the shorter short frame of a large amount of length, the ratio of the transmission frame as shared by mac frame head in short frame is bigger than the ratio of transmission frame shared by mac frame head in long frame, and short frame reduces radio channel utilization.Improve a kind of mode of short frame radio channel utilization are as follows: be that long frame transmits by these short frame aggregations when a wireless device there are multiple short frames to need to transmit.It can not polymerize however, when these short frames belong to different user, between them.Therefore, set about in the present embodiment from the mac frame head of short frame, the ratio of transmission frame shared by mac frame head is reduced by the address field collection in compression mac frame head.

In the present embodiment, transmission frame is constructed according to existing rule, transmission frame includes physical header, mac frame head and Frame Check Sequence.Mac frame head includes the address field collection and frame control field being made of at least one address field, wherein frame control field includes the type of transmission frame and the transmission direction of transmission frame.Frame Check Sequence calculates acquisition using special algorithm, according to mac frame head and frame two parts.Wherein, instruction information may be located in the domain SERVICE.The domain SERVICE is located at before mac frame head.

S402, the address field that can be removed in the sets of fields of address is determined according to the type of transmission frame and the transmission direction of transmission frame.

In the present embodiment, the type of transmission frame can be control frame, data frame, management frame etc., and the transmission direction of transmission frame can be downlink frame, uplink frame, direct-connected frame etc..

In the present embodiment, control frame generally comprises the transmission address of frame and receives address, or only includes and receive address, these addresses can all be removed, that is, can be compressed.Wherein, the address for sending the source wireless device that address is transmission frame receives the address for the purpose wireless device that address is transmission frame.

In the present embodiment, data frame is according to the difference of From DS and To DS value in control field, direct-connected frame (From DS=0 can be divided into, To DS=0), downlink frame (From DS=1, To DS=0), uplink frame (From DS=0, To DS=1) and Mesh frame (From DS=1, To DS=1), due between any Mesh node all can free communication, do not compress the address of Mesh frame;Uplink frame and downlink frame include receiving address, sending address and third address, and receiving address and sending address can be removed, and work as frame Part is MAC Service Data Unit (MAC Service Data Unit, when MSDU), third address is source wireless device address or purpose wireless device address (device address except current Wi-Fi network), therefore third address not can be compressed;When body section is polymerization MSDU (Aggregate MSDU, A-MSDU), third address is basic service set identification (Basic Service Set Identifier, BSSID), that is, when accessing dot address, therefore can be compressed.Do you how to know that received transmission frame body section is MSDU or A-MSDU? in fact, service quality (Quality of Service in mac frame head, QoS) there are A-MSDU instructions in control (Control) field, being used to indicate body section is A-MSDU or MSDU, and position is after third address.Therefore, the presence or absence of third address will affect relative position of the QoS Control field in frame, i.e., according to QoS control field position, recipient can not first pass through the field and obtain the existing instruction of A-MSDU, then determine that third address whether there is again.Therefore, in compression transmission frame, QoS control field is mentioned to the position before all address fields, instruction existing for the A-MSDU in QoS control field can be first checked so as to recipient, may thereby determine that whether third address is compressed.The position movement of QoS control field can occur FCS calculate before, can also occur FCS calculate after, this embodiment is not limited, but other equipment receive transmission frame after should also make corresponding inverse operations.Direct-connected frame: it can be compressed including two direct-connected site addresses, and the address with the same access point of the two station associates, three.

In the present embodiment, management frame includes receiving address, sending address and third address, wherein receiving address and sending address can be compressed, third address can be the BSSID of BSSID (address of access point) or wildcard, and the BSSID of wildcard cannot be compressed.Therefore, management frame address field collection is compressed with two schemes: A) only crimping receives address and sends address, and third address is not compressed always;B) when third address is BSSID, three address fields are compressed;When third address is wildcard BSSID, three address fields do not compress.Since third address is mostly BSSID in real network, option b is preferred embodiment.

In the present embodiment, when there are multiple wireless devices to be associated with local terminal, in order to quickly determine the identity of transmitting terminal, reduce and sound out number, some auxiliary mechanisms can be used.A kind of basic scheme is that only a compression one or more of them address, other addresses are not compressed, such as: in uplink frame or downlink frame, retain and receive address, and compresses and send address;In direct-connected frame, retain the address of Source Site or purpose website, and compresses the address of another website and the address of access point.Furthermore, the short mark of sending ending equipment, such as association identification (Association Identifier can also be carried in the physical header or MAC header of transmission frame while compressing address sets of fields, AID), partial association mark (Partial AID, PAID) etc..

In the present embodiment, if in transmission frame including polymerization Medium Access Control (MAC) Protocol Data Unit (Aggregate MAC Protocol data unit, A-MPDU), then address above mentioned field is removed into all Medium Access Control (MAC) Protocol Data Units (MAC protocol data unit, MPDU) that rule is used in A-MPDU.

S403, the address that address field concentration can be removed is removed, to obtain the mac frame head of compression.

Instruction information in S404, setting physical header makes to indicate that information is used to indicate transmission frame compression transmission frame, to obtain compression transmission frame.

In the present embodiment, physical header includes SIG field, including instruction information, is used to indicate whether transmission frame is compression transmission frame.For example, expression transmission frame is compression transmission frame when the value of instruction information is 1, when the value for indicating information is 0, expression transmission frame is uncompressed transmission frame.

S405, compression transmission frame is sent.

In mac frame head compression method shown in Fig. 4, before sending transmission frame, first address field some or all of in mac frame leading address sets of fields is removed, to reduce the mac frame head length of transmission frame, the ratio that mac frame head occupies in transmission frame is reduced, to improve channel utilization.

Referring to Fig. 5, Fig. 5 is the flow chart of another mac frame head compression method disclosed by the embodiments of the present invention.Wherein, mac frame head compression method shown in fig. 5 is suitable for the wireless devices such as mobile phone, tablet computer.Mac frame head compression method shown in fig. 5 is described from the angle of receiving side.As shown in figure 5, the mac frame head compression method may comprise steps of.

S501, transmission frame is received, transmission frame includes physical header, mac frame head and Frame Check Sequence, mac frame head includes the type of transmission frame, the transmission direction of transmission frame and address field collection, and physical header includes instruction information, and it is compression transmission frame that instruction information, which is used to indicate transmission frame,.

In the present embodiment, in 802.11 network of IEEE, there are the shorter short frame of a large amount of length, the ratio of the transmission frame as shared by mac frame head in short frame is bigger than the ratio of transmission frame shared by mac frame head in long frame, and short frame reduces radio channel utilization.Improve a kind of mode of short frame radio channel utilization are as follows: be that long frame transmits by these short frame aggregations when a wireless device there are multiple short frames to need to transmit.It can not polymerize however, when these short frames belong to different user, between them.Therefore, set about in the present embodiment from the mac frame head of short frame, the ratio of transmission frame shared by mac frame head is reduced by the address field in compression mac frame head.Wherein, instruction information may be located in the domain SERVICE.The domain SERVICE is located at before mac frame head.

S502, judge whether transmission frame is compression transmission frame according to instruction information.

In the present embodiment, need to carry out recovery processing after compression transmission frame due to receiving, when transmission frame not It when being compression transmission frame, does not need to carry out recovery processing, therefore, includes instruction information in the SIG field in the physical header of transmission frame, be used to indicate whether transmission frame is compression transmission frame.For example, expression transmission frame is compression transmission frame when the position the Compress of SIG field is 1, when the position the Compress of transmission frame SIG field is 0, indicate that transmission frame is not compression transmission frame.Wherein, the type of transmission frame can be control frame, data frame, management frame etc., and the transmission direction of transmission frame can be downlink frame, uplink frame, direct-connected frame etc..

S503, when transmission frame be compression transmission frame when, according to the transmission direction of the type of transmission frame and transmission frame determine in the sets of fields of address be removed address.

In the present embodiment, after receiving transmission frame, it will judge whether transmission frame is compression transmission frame according to instruction information, when transmission frame is compression transmission frame, the address being removed in the sets of fields of address is determined using the type of transmission frame and the transmission direction of transmission frame.

The removed address of S504, addition, to obtain the transmission frame of decompression.

Any one or more of address, transmission address, third address are received in transmission frame may all be compressed.This, which sentences while compressing, receives address with for transmission address, illustrates how receiving end restores compressed address field.Other situation using similar approach processing, details are not described herein again.

When removed address is made of the reception address of transmission frame and the transmission address of transmission frame, removed address is added, may comprise steps of with obtaining the transmission frame of decompression.

A1, using with the address of the associated wireless device of local terminal as the transmission address of transmission frame, include the transmission frame for being removed address to obtain using the address of local terminal as the reception address of transmission frame.

A2, the target Frame Check Sequence for calculating the transmission frame including being removed address.

A3, judge whether target Frame Check Sequence matches with the Frame Check Sequence that transmission frame includes, will include being removed the transmission frame of address as the transmission frame of decompression when target Frame Check Sequence is matched with the Frame Check Sequence.

In the present embodiment, when removed address is made of the sending device address of transmission frame and the reception address of transmission frame, assuming that being at this time the transmission address of transmission frame with the address of the associated wireless device of local terminal, the address of local terminal is the reception address of transmission frame, it include the transmission frame for being removed address to obtain, being calculated later using Cyclic Redundancy Algorithms includes the target Frame Check Sequence for being removed the transmission frame of address, judge whether target Frame Check Sequence matches with the Frame Check Sequence that transmission frame includes later, when target Frame Check Sequence is matched with the Frame Check Sequence that transmission frame includes, then show to assume to set up, transmission frame is that this is sent to by associated wireless device The transmission frame at end will include being removed the transmission frame of address as the transmission frame of decompression;When target Frame Check Sequence and the Frame Check Sequence mismatch, then show to assume invalid, transmission frame is not the transmission frame that associated wireless device is sent to local terminal.When the wireless device being connected with local terminal is multiple wireless devices, multiple aforesaid operations will be executed, until successful match or until attempted all wireless devices being connected with local terminal.

In the present embodiment, when there are multiple wireless devices to be associated with local terminal, in order to quickly determine the identity of transmitting terminal, reduce and sound out number, some auxiliary mechanisms can be used.A kind of basic scheme is that only a compression one or more of them address, other addresses are not compressed, such as: in uplink frame or downlink frame, retain and receive address, and compresses and send address;In direct-connected frame, retain the address of Source Site or purpose website, and compresses the address of another website and the address of access point.Further, it is also possible to carry the short mark of sending ending equipment, such as AID, PAID etc. in the physical header or MAC header of transmission frame while compressing address sets of fields.

In mac frame head compression method shown in Fig. 5, when transmission frame is condensed frame, address is removed some or all of in mac frame leading address sets of fields, and the length of the mac frame head of transmission frame reduces, the ratio for occupying mac frame head in transmission frame reduces, to improve channel utilization.

Referring to Fig. 6, Fig. 6 is a kind of structure chart of wireless device disclosed by the embodiments of the present invention.Wherein, which can be mobile phone, tablet computer etc., and this embodiment is not limited.As shown in fig. 6, the wireless device 600 may include:

Receiving unit 601, for receiving transmission frame, transmission frame includes service field and Duration field, wherein, service field includes check field, carry the first check value in check field, the first check value is that the second check value is carried in check field and obtains after wireless channel transmits, and the second check value is to send when the wireless device of transmission frame generates transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, sets of fields is the part field in field that transmission frame includes, and sets of fields includes Duration field;Duration field includes the duration;

Judging unit 602, the first check value for including according to the received transmission frame of receiving unit 601 determine whether the duration is effective duration;

Updating unit 603, for updating the NAV timer of the wireless device using the duration that the received transmission frame of receiving unit 601 includes when judging unit 602 determines that the duration is effective duration.

Specifically, updating unit 603 are specifically used for updating the NAV timer of the wireless device using the duration when judging unit 602 determines that the duration is effective duration.

As a kind of possible embodiment, judging unit 602 is specifically used for:

Third check value is calculated by pre-defined algorithm according to sets of fields;

When the first check value is matched with third check value, determine that the duration is effective duration.

As a kind of possible embodiment, transmission frame further includes destination address field, and destination address field includes the reception address of transmission frame, and sets of fields further includes destination address field;

Updating unit 603, specifically for when determining that the duration is effective duration, reception address is effective reception address according to the first check value, if the address for receiving address and the wireless device mismatches, and the duration be greater than the wireless device network allocation vector timer time when, then using the duration update the wireless device network allocation vector timer.

As a kind of possible embodiment, transmission frame further includes physical header, and physical header includes instruction information, and it includes check field that instruction information, which is used to indicate transmission frame,.

In existing method, wireless device only when receiving address is effective address and reception address and the address of local terminal mismatch, if transmission frame is valid frame, just updates the NAV timer of local terminal using the duration;When received transmission frame is invalid frame, NAV timer can not be arranged according to the duration in the wireless device, data will be sent in the wireless channel reduces virtual carrier sensing in wireless network communication reliability so that multiple wireless devices occur in same wireless channel of same time while sending data.In virtual carrier sensing method provided in an embodiment of the present invention, by including check field in the service field of transmission frame, determine whether the duration that received transmission frame includes is effective duration according to the first check value carried in the check field, whether the reception address that received transmission frame includes is effective reception address, no matter whether received transmission frame is valid frame, it does not need to judge whether the transmission frame is valid frame using FCS to the entire frame of transmission frame, it only needs to verify the reception address for including in transmission frame and duration, it is effectively to receive address when receiving address, and when reception address and the address of local terminal mismatch, determine that the duration for including in transmission frame is effective duration, the NAV timer of local terminal can be updated using the duration, so that local terminal is in NAV timer Time be decremented to not send data before zero, the case where occurring multiple wireless devices in same wireless channel of same time while sending data is avoided, so as to improve virtual carrier sensing in wireless network communication reliability.

Referring to Fig. 7, Fig. 7 is the structure chart of another wireless device disclosed by the embodiments of the present invention.Wherein, which can be mobile phone, tablet computer etc., and this embodiment is not limited.As shown in fig. 7, the nothing Line equipment 700 may include processor 701, memory 702, input unit 703 and output device 704.Processor 701 can be connect with memory 702, processor 701 with input unit 703, processor 701 with output device 704 by bus or other means, in the present embodiment by taking bus connects as an example.Wherein:

Input unit 703, for receiving transmission frame and being sent to processor 701, transmission frame includes service field and Duration field, wherein, service field includes check field, carry the first check value in check field, the first check value is that the second check value is carried in check field and obtains after wireless channel transmits, and the second check value is to send when the wireless device of transmission frame generates transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, sets of fields is the part field in field that transmission frame includes, and sets of fields includes Duration field;Duration field includes the duration;

Batch processing code is stored in memory 702, processor 701 is for calling the program code stored in memory 702 to execute following operation:

Determine whether the duration is effective duration according to the first check value;

When determining the duration is effective duration, the NAV timer of the wireless device is updated using the duration.

As a kind of possible embodiment, output device 704, for sending message.

As a kind of possible embodiment, processor 701 be used for determined according to the first check value the duration whether be effective duration mode specifically:

Processor 701 is used to that third check value to be calculated by pre-defined algorithm according to sets of fields;

When the first check value is matched with third check value, determine that the duration is effective duration.

As a kind of possible embodiment, transmission frame further includes destination address field, and destination address field includes the reception address of transmission frame, and sets of fields further includes destination address field;

Processor 701 be used for when determine the duration be effective duration when, by the duration update the network allocation vector timer of the wireless device in the way of specifically:

Processor 701 is used for when determining that the duration is effective duration, reception address is effective reception address according to the first check value, if the address for receiving address and the wireless device mismatches, and the duration is greater than the time of the network allocation vector timer of the wireless device, then the network allocation vector timer of the wireless device is updated using the duration.

As a kind of possible embodiment, transmission frame further includes physical header, and physical header includes instruction information, and it includes check field that instruction information, which is used to indicate transmission frame,.

In existing method, wireless device only when receiving address is effective address and reception address and the address of local terminal mismatch, if transmission frame is valid frame, just updates the NAV timer of local terminal using the duration;When received transmission frame is invalid frame, NAV timer can not be arranged according to the duration in the wireless device, data will be sent in the wireless channel reduces virtual carrier sensing in wireless network communication reliability so that multiple wireless devices occur in same wireless channel of same time while sending data.In virtual carrier sensing method provided in an embodiment of the present invention, by including check field in the service field of transmission frame, determine whether the duration that received transmission frame includes is effective duration according to the first check value carried in the check field, whether the reception address that received transmission frame includes is effective reception address, no matter whether received transmission frame is valid frame, it does not need to judge whether the transmission frame is valid frame using FCS to the entire frame of transmission frame, it only needs to verify the reception address for including in transmission frame and duration, it is effectively to receive address when receiving address, and when reception address and the address of local terminal mismatch, determine that the duration for including in transmission frame is effective duration, the NAV timer of local terminal can be updated using the duration, so that local terminal is in NAV timer Time be decremented to not send data before zero, the case where occurring multiple wireless devices in same wireless channel of same time while sending data is avoided, so as to improve virtual carrier sensing in wireless network communication reliability.

Referring to Fig. 8, Fig. 8 is the structure chart of another wireless device disclosed by the embodiments of the present invention.Wherein, which can be mobile phone, tablet computer etc., and this embodiment is not limited.As shown in figure 8, the wireless device 800 may include:

Generation unit 801, for generating transmission frame, transmission frame includes service field and Duration field, wherein, service field includes check field, and the second check value is carried in check field, second check value is calculated according to sets of fields by pre-defined algorithm, sets of fields is the part field in the field that transmission frame includes, and sets of fields includes Duration field, and Duration field includes the duration;

Transmission unit 802, for sending the transmission frame of the generation of generation unit 801, so that the targeted wireless device for receiving transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the network allocation vector timer of the targeted wireless device is updated using the duration, wherein, the first check value is that the second check value is carried in check field and obtains after wireless channel transmits.

As a kind of possible embodiment, transmission frame further includes destination address field, and destination address field includes the reception address of transmission frame, and sets of fields further includes destination address field.

As a kind of possible embodiment, transmission frame further includes physical header, and physical header includes instruction information, and it includes check field that instruction information, which is used to indicate transmission frame,.

In the wireless device described in Fig. 8, the transmission frame of generation includes check field, the second check value is carried in check field, after being received by wireless device corresponding with address is received using other wireless devices of same wireless channel, it whether will be effective duration using the first check value verifying duration, wherein, first check value is that the second check value is carried in check field and obtains after wireless channel transmits, when the duration is effective duration, their NAV timer will be updated using the duration, avoid the case where occurring multiple wireless devices in same wireless channel of same time while sending data, so as to improve virtual carrier sensing in wireless network communication reliability.

Referring to Fig. 9, Fig. 9 is the structure chart of another wireless device disclosed by the embodiments of the present invention.Wherein, which can be mobile phone, tablet computer etc., and this embodiment is not limited.As shown in figure 9, the wireless device 900 may include processor 901, memory 902, output device 903 and input unit 904.Processor 901 can be connect with memory 902, processor 901 with input unit 903, processor 901 with input unit 904 by bus or other means, in the present embodiment by taking bus connects as an example.Wherein:

Batch processing code is stored in memory 902, processor 901 is for calling the program code stored in memory 902 to execute following operation:

Generate transmission frame, transmission frame includes service field and Duration field, wherein, service field includes check field, the second check value is carried in check field, the second check value is calculated according to sets of fields by pre-defined algorithm, and sets of fields is the part field in the field that transmission frame includes, sets of fields includes Duration field, and Duration field includes the duration;

Output device 903, for sending transmission frame, so that the targeted wireless device for receiving transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the network allocation vector timer of the targeted wireless device is updated using the duration, wherein, the first check value is that the second check value is carried in check field and obtains after wireless channel transmits.

As a kind of possible embodiment, which can also include input unit 904, for receiving message.

As a kind of possible embodiment, transmission frame further includes destination address field, and destination address field includes the reception address of transmission frame, and sets of fields further includes destination address field.

As a kind of possible embodiment, transmission frame further includes physical header, and physical header includes instruction information, and it includes check field that instruction information, which is used to indicate transmission frame,.

In wireless device shown in Fig. 9, the transmission frame of generation includes check field, the second check value is carried in check field, after being received by wireless device corresponding with address is received using other wireless devices of same wireless channel, it whether will be effective duration using the first check value verifying duration, wherein, first check value is that the second check value is carried in check field and obtains after wireless channel transmits, when the duration is effective duration, their NAV timer will be updated using the duration, avoid the case where occurring multiple wireless devices in same wireless channel of same time while sending data, so as to improve virtual carrier sensing in wireless network communication reliability.

Referring to Fig. 10, Figure 10 is the structure chart of another wireless device disclosed by the embodiments of the present invention.Wherein, which can be mobile phone, tablet computer etc., and this embodiment is not limited.As shown in Figure 10, which may include:

Construction unit 1001, for constructing transmission frame, transmission frame includes physical header, mac frame head and Frame Check Sequence, and mac frame head includes the type of transmission frame, the transmission direction of transmission frame and address field collection, physical header include be used to indicate transmission frame whether be compression transmission frame instruction information;

The transmission direction of determination unit 1002, the transmission frame of type and construction unit 1001 building of the transmission frame for being constructed according to construction unit 1001 determines the address field that can be removed in the sets of fields of address;

Unit 1003 is removed, the removed address of the energy that the address field for removing the building of construction unit 1001 concentrates determination unit 1002 to determine, to obtain the mac frame head of compression;

Acquiring unit 1004, the instruction information in physical header that the transmission frame for the building of construction unit 1001 to be arranged includes, makes to indicate that information is used to indicate transmission frame compression transmission frame, to obtain compression transmission frame;

Transmission unit 1005 sends the compression transmission frame that acquiring unit 1004 obtains.

Specifically, remove unit 1003, the removed address of the energy that address field for removing the building of construction unit 1001 concentrates determination unit 1002 to determine, to obtain the mac frame head of compression, the instruction information in the physical header that the transmission frame that construction unit 1001 constructs includes is arranged in triggering acquiring unit 1004, make to indicate that information is used to indicate transmission frame compression transmission frame, to obtain compression transmission frame

In wireless device shown in Fig. 10, before sending transmission frame, first address field some or all of in mac frame leading address sets of fields is removed, to reduce the mac frame head length of transmission frame, the ratio that mac frame head occupies in transmission frame is reduced, to improve channel utilization.

Figure 11 is please referred to, Figure 11 is the structure chart of another wireless device disclosed by the embodiments of the present invention.Wherein, which can be mobile phone, tablet computer etc., and this embodiment is not limited.As shown in figure 11, which may include processor 1101, memory 1102, output device 1103 and input unit 1104.Processor 1101 can be connect with memory 1102, processor 1101 with output device 1103, processor 1101 with input unit 1104 by bus or other means, in the present embodiment by taking bus connects as an example.Wherein:

Batch processing code is stored in memory 1102, processor 1101 is for calling the program code stored in memory 1102 to execute following operation:

Construct transmission frame, transmission frame includes physical header, mac frame head and Frame Check Sequence, and mac frame head includes the type of transmission frame, the transmission direction of transmission frame and address field collection, physical header include be used to indicate transmission frame whether be compression transmission frame instruction information;

The address field that can be removed in the sets of fields of address is determined according to the transmission direction of the type of transmission frame and transmission frame;

It removes address field and concentrates the address that can be removed, to obtain the mac frame head of compression;

Instruction information in physical header is set, makes to indicate that information is used to indicate transmission frame compression transmission frame, to obtain compression transmission frame;

Output device 1103, for sending compression transmission frame.

As a kind of possible embodiment, input unit 1104, for receiving message.

In the wireless device shown in Figure 11, before sending transmission frame, first address field some or all of in mac frame leading address sets of fields is removed, to reduce the mac frame head length of transmission frame, the ratio that mac frame head occupies in transmission frame is reduced, to improve channel utilization.

Figure 12 is please referred to, Figure 12 is the structure chart of another wireless device disclosed by the embodiments of the present invention.Wherein, which can be mobile phone, tablet computer etc., and this embodiment is not limited.As shown in figure 12, which may include:

Receiving unit 1201, for receiving transmission frame, transmission frame includes physical header, mac frame head and Frame Check Sequence, and mac frame head includes the type of transmission frame, the transmission direction of transmission frame and address field collection, physical header includes instruction information, and it is compression transmission frame that instruction information, which is used to indicate transmission frame,;

Judging unit 1202, for whether judging transmission frame according to the received instruction information of receiving unit 1201 For compression transmission frame;

Determination unit 1203, for when the judging result of judging unit 1202, which is, is, the transmission direction for the transmission frame that the type and receiving unit 1201 of the transmission frame obtained using receiving unit 1201 are obtained to determine the address being removed in sets of fields;

Adding unit 1204, the removed address determined for adding determination unit 1203, to obtain the transmission frame of decompression.

As a kind of possible embodiment, when removed address is made of the reception address of transmission frame and the transmission address of transmission frame, adding unit 1204 may include:

Address obtains subelement, for including the transmission frame for being removed address to obtain using the address of the wireless device as the reception address of transmission frame using the address of the targeted wireless device with the wireless device association as the transmission address of transmission frame.

Retrieval subelement obtains the target Frame Check Sequence for the transmission frame including being removed address that subelement obtains for calculating address.

Judgment sub-unit, whether the target Frame Check Sequence for judging that retrieval subelement obtains matches with the Frame Check Sequence that the received transmission frame of receiving unit 1201 includes, it will include being removed the transmission frame of address as the transmission frame of decompression when the judging result of judgment sub-unit, which is, is.

In the wireless device shown in Figure 12, when transmission frame is condensed frame, address field is removed some or all of in mac frame leading address sets of fields, and the length of the mac frame head of transmission frame reduces, the ratio for occupying mac frame head in transmission frame reduces, to improve channel utilization.

Figure 13 is please referred to, Figure 13 is the structure chart of another wireless device disclosed by the embodiments of the present invention.Wherein, which can be mobile phone, tablet computer etc., and this embodiment is not limited.As shown in figure 13, which may include processor 1301, memory 1302, input unit 1303 and output device 1304.Processor 1301 can be connect with memory 1302, processor 1301 with input unit 1303, processor 1301 with output device 1304 by bus or other means, and the present embodiment is by taking bus connects as an example.Wherein:

Input unit 1303, for receiving transmission frame, transmission frame includes physical header, mac frame head and Frame Check Sequence, and mac frame head includes the type of transmission frame, the transmission direction of transmission frame and address field collection, physical header includes instruction information, and it is compression transmission frame that instruction information, which is used to indicate transmission frame,;

Batch processing code is stored in memory 1302, processor 1301 is for calling memory 1302 The program code of middle storage executes following operation:

Judge whether transmission frame is compression transmission frame according to instruction information;

When transmission frame is compression transmission frame, the address being removed in the sets of fields of address is determined according to the transmission direction of the type of transmission frame and transmission frame;

The removed address of addition, to obtain the transmission frame of decompression.

As a kind of possible embodiment, output device 1304, for sending message.

As a kind of possible embodiment, when removed address is made of the reception address of transmission frame and the transmission address of transmission frame, the removed address of the addition of processor 1301, in a manner of obtaining the transmission frame of decompression specifically:

It include the transmission frame for being removed address to obtain using the address of the wireless device as the reception address of transmission frame using the address of the targeted wireless device with the wireless device association as the transmission address of transmission frame;

Calculating includes the target Frame Check Sequence for being removed the transmission frame of address;

Judge whether target Frame Check Sequence matches with the Frame Check Sequence that transmission frame includes, will include being removed the transmission frame of address as the transmission frame of decompression if target Frame Check Sequence is matched with the Frame Check Sequence.

In the wireless device shown in Figure 13, when transmission frame is condensed frame, address is removed some or all of in mac frame leading address sets of fields, and the length of the mac frame head of transmission frame reduces, the ratio for occupying mac frame head in transmission frame reduces, to improve channel utilization.

In one embodiment, the embodiment of the present invention further discloses a kind of computer storage medium, the computer storage medium is stored with computer program, when the computer program in computer storage medium is read into computer, computer is enabled to complete the Overall Steps of virtual carrier sensing method disclosed by the embodiments of the present invention.

It should be noted that, for each embodiment of the method above-mentioned, for simple description, therefore, it is stated as a series of action combinations, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described, because according to the present invention, certain some step can be performed in other orders or simultaneously.Secondly, those skilled in the art should also know that, the embodiments described in the specification are all preferred embodiments, and related actions and modules are not necessarily necessary for the present invention.

Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is relevant hardware can be instructed to complete by program, which can store computer-readable in one In storage medium, storage medium may include: flash disk, read-only memory (Read-Only Memory, ROM), random access device (Random Access Memory, RAM), disk or CD etc..

It is provided for the embodiments of the invention virtual carrier sensing method above and device is described in detail, used herein a specific example illustrates the principle and implementation of the invention, and the above description of the embodiment is only used to help understand the method for the present invention and its core ideas;At the same time, for those skilled in the art, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.

Claims (21)

  1. A kind of virtual carrier sensing method characterized by comprising
    Receive transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, the first check value is carried in the check field, first check value is that the second check value is carried in the check field and obtains after wireless channel transmits, and second check value is to send when the wireless device of the transmission frame generates the transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, the sets of fields is the part field in field that the transmission frame includes, and the sets of fields includes the Duration field;The Duration field includes the duration;
    Determine whether the duration is effective duration according to first check value;
    When determining the duration is effective duration, the network allocation vector timer of local terminal is updated using the duration.
  2. The method as described in claim 1, which is characterized in that described to determine whether the duration is effective duration according to first check value, comprising:
    Third check value is calculated by the pre-defined algorithm according to the sets of fields;
    When first check value is matched with the third check value, determine that the duration is effective duration.
  3. It is method according to claim 1 or 2, which is characterized in that the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field;
    It is described when determine the duration be effective duration when, using the duration update local terminal network allocation vector timer include:
    When determining that the duration is effective duration, the reception address is effective reception address according to first check value, if address and the address of local terminal of receiving mismatches, and the duration is greater than the time of the network allocation vector timer of local terminal, then the network allocation vector timer of local terminal is updated using the duration.
  4. Method a method according to any one of claims 1-3, which is characterized in that the transmission frame further includes physics Head, the physical header include instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.
  5. A kind of virtual carrier sensing method characterized by comprising
    Generate transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, the second check value is carried in the check field, second check value is calculated according to sets of fields by pre-defined algorithm, and the sets of fields is the part field in the field that the transmission frame includes, the sets of fields includes the Duration field, and the Duration field includes the duration;
    Send the transmission frame, so that the wireless device for receiving the transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the network allocation vector timer of the wireless device is updated using the duration, wherein, first check value is that second check value is carried in the check field and obtains after wireless channel transmits.
  6. Method as claimed in claim 5, which is characterized in that the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field.
  7. Such as method described in claim 5 or 6, which is characterized in that the transmission frame further includes physical header, and the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.
  8. A kind of wireless device characterized by comprising
    Receiving unit, for receiving transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, carry the first check value in the check field, first check value is that the second check value is carried in the check field and obtains after wireless channel transmits, and second check value is to send when the wireless device of the transmission frame generates the transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, the sets of fields is the part field in field that the transmission frame includes, and the sets of fields includes the Duration field;The Duration field includes the duration;
    Judging unit, the first check value for including according to the received transmission frame of the receiving unit determine whether the duration is effective duration;
    Updating unit, for updating the network allocation vector timer of the wireless device using the duration when the judging unit determines that the duration is effective duration.
  9. Wireless device as claimed in claim 8, which is characterized in that the judging unit is specifically used for:
    Third check value is calculated by the pre-defined algorithm according to the sets of fields;
    When first check value is matched with the third check value, determine that the duration is effective duration.
  10. Wireless device as claimed in claim 8 or 9, which is characterized in that the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field;
    The updating unit, specifically for when determining that the duration is effective duration, the reception address is effective reception address according to first check value, if address and the address of the wireless device of receiving mismatches, and the duration be greater than the wireless device network allocation vector timer time when, then the network allocation vector timer of the wireless device is updated using the duration.
  11. Wireless device as described in claim 8-10 is any, which is characterized in that the transmission frame further includes physical header, and the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.
  12. A kind of wireless device, which is characterized in that including processor, memory and input unit, in which:
    The input unit, for receiving transmission frame and being sent to the processor, the transmission frame includes service field and Duration field, wherein, the service field includes check field, the first check value is carried in the check field, first check value is that the second check value is carried in the check field and obtains after wireless channel transmits, and second check value is to send when the wireless device of the transmission frame generates the transmission frame to be calculated according to sets of fields by pre-defined algorithm;Wherein, the sets of fields is the part field in field that the transmission frame includes, and the sets of fields includes the Duration field;It is described lasting Time field includes the duration;
    Batch processing code is stored in the memory, the processor is for calling the program code stored in the memory to execute following operation:
    Determine whether the duration is effective duration according to first check value;
    When determining the duration is effective duration, the network allocation vector timer of the wireless device is updated using the duration.
  13. Wireless device as claimed in claim 12, which is characterized in that the processor be used for determined according to first check value duration whether be effective duration mode specifically:
    The processor is used to that third check value to be calculated by the pre-defined algorithm according to the sets of fields;
    When first check value is matched with the third check value, determine that the duration is effective duration.
  14. Wireless device as described in claim 12 or 13, which is characterized in that the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field;
    The processor be used for when determine the duration be effective duration when, by the duration update the network allocation vector timer of the wireless device in the way of specifically:
    The processor is used for when determining that the duration is effective duration, the reception address is effective reception address according to first check value, if address and the address of the wireless device of receiving mismatches, and the duration is greater than the time of the network allocation vector timer of the wireless device, then the network allocation vector timer of the wireless device is updated using the duration.
  15. Wireless device as described in claim 12-14 is any, which is characterized in that the transmission frame further includes physical header, and the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.
  16. A kind of wireless device characterized by comprising
    Generation unit, for generating transmission frame, the transmission frame includes service field and Duration field, Wherein, the service field includes check field, the second check value is carried in the check field, second check value is calculated according to sets of fields by pre-defined algorithm, the sets of fields is the part field in the field that the transmission frame includes, the sets of fields includes the Duration field, and the Duration field includes the duration;
    Transmission unit, the transmission frame generated for sending the generation unit, so that the targeted wireless device for receiving the transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the network allocation vector timer of the targeted wireless device is updated using the duration, wherein, first check value is that second check value is carried in the check field and obtains after wireless channel transmits.
  17. Wireless device as claimed in claim 16, which is characterized in that the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field.
  18. Wireless device as described in claim 16 or 17, which is characterized in that the transmission frame further includes physical header, and the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.
  19. A kind of wireless device, which is characterized in that including processor, memory and output device, in which:
    Batch processing code is stored in the memory, the processor is for calling the program code stored in the memory to execute following operation:
    Generate transmission frame, the transmission frame includes service field and Duration field, wherein, the service field includes check field, the second check value is carried in the check field, second check value is calculated according to sets of fields by pre-defined algorithm, and the sets of fields is the part field in the field that the transmission frame includes, the sets of fields includes the Duration field, and the Duration field includes the duration;
    The output device, for sending the transmission frame, so that the targeted wireless device for receiving the transmission frame determines whether the duration is effective duration according to the first check value, and when determining the duration is effective duration, the network allocation vector timer of the targeted wireless device is updated using the duration, wherein, first check value is that second check value is carried at the check word It is obtained after wireless channel transmits in section.
  20. Wireless device as claimed in claim 19, which is characterized in that the transmission frame further includes destination address field, and the destination address field includes the reception address of the transmission frame, and the sets of fields further includes the destination address field.
  21. Wireless device as described in claim 19 or 20, which is characterized in that the transmission frame further includes physical header, and the physical header includes instruction information, and it includes the check field that the instruction information, which is used to indicate the transmission frame,.
CN201480080356.9A 2014-11-29 2014-11-29 A kind of virtual carrier sensing method and device CN106471785A (en)

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