CN102624483B - Method and device for data transmission - Google Patents
Method and device for data transmission Download PDFInfo
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- CN102624483B CN102624483B CN201210053629.3A CN201210053629A CN102624483B CN 102624483 B CN102624483 B CN 102624483B CN 201210053629 A CN201210053629 A CN 201210053629A CN 102624483 B CN102624483 B CN 102624483B
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Abstract
The invention discloses a method and a device for data transmission, which relate to the technical field of communication. Power strength signals are used for representing transmission power used by other network devices by attenuating the obtained power strength signals; attenuated power strength signals are compared with a preset disturbance threshold; and when the attenuated power strength signals are smaller than the disturbance threshold, a data frame is sent. The method and the device for the data transmission can achieve that two and more than two devices on the same frequency channel can send the data frame simultaneously, improve channel use rate, and are mainly applied to wireless local area network technology.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method and apparatus of transfer of data.
Background technology
Along with the development of the communication technology, WLAN (wireless local area network) (Wireless Local Area Network is called for short WLAN) technology develops growth rapidly, grows into current mainstream technology between a few years.WLAN technology is carried out transfer of data taking air as medium by semiduplex mode.
Under half-duplex data-transmission mode, two above equipment on same frequency channels, for example access point (Access Point, be called for short AP) or work station (Station) cannot send Frame simultaneously, if there are at least two equipment sending Frame on same frequency channels simultaneously, every equipment all can be subject to the interference of other equipment sending data frames and Frame correctly cannot be sent to corresponding receiving equipment.Prior art avoids (Carrier Sense Multiple Access with Collision Avoidance, CSMA/CA) mechanism to avoid having on a certain frequency channels the situation of two equipment sending datas by Carrier Sense Multiple Access/conflict simultaneously.Concrete, a certain equipment, before sending some Frames, need to be monitored other equipment and whether send Frame.If do not have other equipment carrying out Frame transmission, directly send Frame; If there are other equipment sending Frame, complete after Frame sends to wait for a frame period and again monitor after the random back-off time whether also have other equipment carrying out Frame transmission at this equipment, until while not having other equipment sending Frame on channel, just Frame is sent.
In practical application, distant between some equipment, owing to sending interference between the equipment that causes of Frame very little, can be similar to and ignore.Under this scene, equipment still sends Frame according to existing send mode, causes data transmission efficiency low, the transfer resource of waste channel.
Summary of the invention
Embodiments of the invention provide a kind of method and apparatus of transfer of data, can on same frequency channels, allow multiple equipment to send Frame simultaneously, can improve the efficiency of transfer of data, make full use of the transfer resource of channel.
On the one hand, the embodiment of the present invention provides a kind of method of transfer of data, comprising:
The power level signal obtaining is decayed, the transmitting power size that described power level signal uses for characterizing other network equipments;
Power level signal after decay and default interference threshold value are compared;
In the time that the power level signal after described decay is less than described interference threshold value, send Frame.
On the other hand, the embodiment of the present invention also provides a kind of equipment of transfer of data, comprises attenuator, comparator and transmitter, wherein,
Described attenuator is for the power level signal obtaining is decayed, and described power level signal is for characterizing the transmitting power size of other equipment uses;
Described comparator is for comparing the power level signal after described attenuator decay and default interference threshold value;
Described transmitter, in the time that the power level signal after described attenuator decay is less than described interference threshold value, sends Frame.
The method and apparatus of the transfer of data that the embodiment of the present invention provides, can be before sending Frame, the power level signal of other equipment on the same frequency channels obtaining is decayed, and the power level signal of described other equipment is for characterizing the transmitting power size of other equipment sending data frames.If the power level signal after decay is less than default interference threshold value, send Frame., phase mutual interference distant at equipment and equipment can be similar under the scene of ignoring, and allows multiple devices to send Frame simultaneously, can improve the efficiency of transfer of data, makes full use of the transfer resource of channel.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method flow diagram of transfer of data in the embodiment of the present invention;
Fig. 2 is the schematic diagram of transfer of data in the embodiment of the present invention;
Fig. 3 is the method flow diagram of another transfer of data in the embodiment of the present invention;
Fig. 4 is the schematic diagram of another transfer of data in the embodiment of the present invention;
Fig. 5 is the method flow diagram of another transfer of data in the embodiment of the present invention;
Fig. 6 is the structural representation of the equipment of transfer of data in the embodiment of the present invention;
Fig. 7 is the structural representation of the equipment of another transfer of data in the embodiment of the present invention;
Fig. 8 is the schematic diagram of another transfer of data in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of method of transfer of data, and as shown in Figure 1, described method comprises the steps:
101, the first equipment is decayed to the power level signal obtaining.
Described power level signal is for characterizing the size of the transmitting power that other equipment sending data frames use.Described the first equipment can be the network measurement equipment including AP, can be also the terminal side equipment including work station.
102, described the first equipment compares the power level signal after decay and default interference threshold value.
In the time that the power level signal after decay is more than or equal to default interference threshold value, the first equipment thinks that other transmit leg equipment sending data frames can affect the correct receiving data frames of receiver equipment corresponding to the first equipment, so do not send Frame.In the time that the power level signal after decay is less than default interference threshold value, the first equipment thinks that other transmit leg equipment sending data frames can or not be similar to the correct receiving data frames of receiver equipment that can not affect corresponding to the first equipment, so send Frame.For example, as shown in Figure 2, equipment 1 communicates with equipment 3, and equipment 2 communicates with equipment 4.Equipment 1 need to send Frame A to equipment 3 as the first equipment, and now equipment 2 sends Frame B to equipment 4.Equipment 1 and equipment 2 use same frequency channels to send Frame.The power level signal that the equipment obtaining 2 is sent Frame B by equipment 1 is decayed.In the time that the power level signal after decay is more than or equal to default interference threshold value, equipment 1 thinks that equipment 2 sends Frame B and can affect the correct receiving data frames A of equipment 3, so do not send Frame.In the time that the power level signal after decay is less than default interference threshold value, equipment 1 thinks that equipment 2 sends Frame and can or not be similar to and can not affect the correct receiving data frames A of equipment 3, so send Frame.
It should be noted that, described in the power level signal that obtains can be the first equipment on port, get other equipment sending data frames time the transmitting power size that uses.Described other equipment can be multiple devices, and the first equipment is decayed to multiple power level signals on port respectively, in the time that the power level signal after all decay is all less than default interference threshold value, and the first equipment sending data frame.
103, in the time that the power level signal after decay is less than interference threshold value, described the first equipment sending data frame.
Still as shown in Figure 2, when the power level signal after comparative result is decay is less than interference threshold value, equipment 1 can, when equipment 2 sends Frame B to equipment 4, send Frame A to equipment 3 on same frequency channels.For this frequency channels, this channel at a time can send Frame by two equipment simultaneously.Because equipment 3 and equipment 2 are distant, equipment 2 sends Frame B and can ignore the impact of equipment 3 correct receiving data frames A, and in existing CSMA/CA mechanism, even if equipment 2 sends Frame B the impact of equipment 3 correct receiving data frames A is ignored, when equipment 2 sends Frame B to equipment 4, equipment 1 can not send Frame A to equipment 3.Compared with current mechanism, the technical scheme providing by this inventive embodiments, is doubled the channel utilization of scene shown in Fig. 2.In the time having 3,4,5 equipment to send Frame on a certain frequency channels, channel utilization is higher simultaneously simultaneously, and transfer resource utilization is more abundant.
It should be noted that, in Fig. 2, equipment 1 does not send equipment 2 the actual emission power value reduction of Frame B, but by the port of equipment 1, get, decay for the power level signal of characterization device 2 transmitting power sizes, be equipment 1 to the angle of equipment 2 transmitting power sizes " cognition " on, the decay that the transmission power level of equipment 2 is carried out.Distant for equipment 2 and equipment 3, disturb almost insignificant scene, equipment 1 can " think " that by the mode of relaxation equipment 2 power level signals equipment 2 is little of can be when equipment 2 sends Frame B to equipment 4 to the interference of equipment 1, send Frame A to equipment 3, and then improve channel utilization.
In embodiments of the present invention, owing to carrying out interactive type communication between equipment, so receiver equipment also can send Frame, in the time sending Frame, this equipment is transmit leg equipment.The for example equipment 3 in Fig. 2 and equipment 4, it is identical with the implementation that equipment 1 sends Frame that equipment 3 and equipment 4 send the implementation of Frame to equipment 1 and equipment 2 respectively as transmit leg equipment, repeats no more herein.
The method of the transfer of data that the embodiment of the present invention provides, can be before sending Frame, the power level signal of other equipment on the same frequency channels obtaining is decayed, and the power level signal of described other equipment is for characterizing the transmitting power size of other equipment sending data frames.If the power level signal after decay is less than default interference threshold value, send Frame., phase mutual interference distant at equipment and equipment can be similar under the scene of ignoring, and allows multiple devices to send Frame simultaneously, can improve the efficiency of transfer of data, makes full use of the transfer resource of channel.
Further, the embodiment of the present invention also provides a kind of method of transfer of data, and as shown in Figure 3, described method is that described method comprises to the further expanding of method shown in Fig. 1:
301, the first equipment is decayed to the power level signal obtaining.
Described power level signal is for characterizing the size of the transmitting power that other equipment sending data frames use.Described the first equipment can be the network measurement equipment including AP, can be also the terminal side equipment including work station.
In an application scenarios of the embodiment of the present invention, owing to there being path loss, the power level signal of other equipment that the first equipment obtains is less than the actual emission power size of other equipment.In embodiments of the present invention, described power level signal also can be for characterizing the transmitting power size through path loss.
Still as shown in Figure 2, the transmitting power that equipment 2 sends Frame B is 100 milliwatt (Milliwatt, be called for short mW), due to the effect of wireless channel path loss, the power level signal of the equipment 2 that equipment 1 in a distance obtains is-75 decibels above milliwatts (decibels above 1 milliwatt, be called for short dBm), be converted to milliwatt unit and be about 0.000000032mW.For convenience of calculation, power level signal is dBm.
Described the first equipment is decayed and is specially power level signal: the first equipment is decayed to power level signal according to default signal attenuation value.Described signal attenuation value can be arranged according to the needs of practical application by network manager, and in the embodiment of the present invention, signal attenuation value describes as an example of 25dBm example, in practical application, signal attenuation value is not limited.Still as shown in Figure 2, the transmitting power that equipment 2 sends Frame B is 20dBm, the power level signal of the equipment 2 that equipment 1 obtains is-75dBm, and equipment 1 according to default signal attenuation value by the power level signal attenuation of equipment 2 is-100dBm ,-75dBm-25dBm=-100dBm.
302, described the first equipment compares the power level signal after decay and default interference threshold value.
When the power level signal after decay is while being more than or equal to default interference threshold value, the first equipment is thought on channel has other equipment sending Frame, and its transmitting power can affect this equipment and correctly send Frame.When the power level signal after decay is while being less than default interference threshold value, the first equipment is thought on channel does not have other equipment sending Frame, so send Frame.Between the setting of described interference threshold value and the transmitting power of other equipment, equipment, distance and transmission medium character are relevant.For example, transmitting power is greater than the be not more than-80dBm of interference threshold value of the equipment of 20dBm, can the equal-76dBm of interference threshold value of the equipment of transmitting power between 17dBm and 20dBm, transmitting power is less than or equal to can the equal-70dBm of interference threshold value of the equipment of 17dBm.Between equipment, distance is far away, and the path loss in equal transmission medium is just larger, so interference threshold value is corresponding smaller.The embodiment of the present invention that arranges for interference threshold value does not limit.
303, in the time that the power level signal after decay is less than interference threshold value, described the first equipment sending data frame.
For example, still as shown in Figure 2, equipment 1 communicates with equipment 3, and equipment 2 communicates with equipment 4.Equipment 1 need to send Frame A to equipment 3 as the first equipment, and now equipment 2 sends Frame B to equipment 4.Equipment 1 and equipment 2 use same frequency channels to send Frame.The power level signal of the equipment 2 recording taking equipment 1 is-75dBm, signal attenuation value is 25dBm, interference threshold value for-76dBm is example: in existing CSMA/CA mechanism, because power level signal is greater than interference threshold value for-76dBm for-75dBm, so equipment 1 " thinks " that equipment 2 is sending Frame B, cause mutually producing and disturbing for avoid equipment 1 and equipment 2 to send Frame on same channel simultaneously, equipment 1 can send Frame B by waiting facilities 2, and after equipment 2 sends Frame B again order wait for a frame period and after the random back-off time, again in supervisory channel, whether there are other equipment sending Frame, if had, continue to wait for, if, do not send Frame A.In embodiments of the present invention, equipment 1 by the power level signal attenuation of equipment 2 25dBm, by decay to-100dBm of original-75dBm, value-76dBm compares with interference threshold, power level signal after decay is less than interference threshold value, equipment 1 " thinks " that equipment 2 is not sending Frame, and equipment 1 can send Frame A.In fact, equipment 1 equipment 2 in the time sending Frame A is sending Frame B, and just equipment thinks that in the angle of " cognition " equipment 2 is not sending Frame B.Due to equipment in Fig. 23 and equipment 2 apart from each others, so equipment 2 sends the transmitting power of Frame B, the interference of equipment 3 correct receiving data frames A can be similar to and be ignored.
Suppose that transmission Frame A and B respectively use 1ms (millisecond), interframe is divided into 10ms, the random back-off time is minimum is 2ms, in CSMA/CA mechanism, sending Frame A and B needs 14ms (send Frame B1ms+ frame period 10ms+ random back-off time 2ms+ and send Frame B1ms).And in embodiments of the present invention, send Frame A and the minimum 1ms of needs of B (equipment 1 and equipment 2 send Frame simultaneously), need at most 2ms (equipment 1 and equipment 2 orders send Frame).Current mechanism has at least been saved 12ms relatively.
304,, in the time that the power level signal after decay is more than or equal to interference threshold value, described the first equipment is decayed to the power level signal after decay again.
In the Another application scene of the embodiment of the present invention, the first equipment can be decayed to the power level signal after decaying again according to default signal attenuation value.The embodiment of the present invention does not limit signal attenuation value.Concrete, still as shown in Figure 2, taking the power level signal of equipment 2 as-55dBm, signal attenuation value is as 10dBm, interference threshold value are as-76dBm is as example: after equipment 1 is decayed the power level signal of equipment 2 according to signal attenuation value, the power level signal after decay is still greater than interference threshold value for-65dBm.Now equipment 1 is decayed to the power level signal after decaying again according to signal attenuation value, the power level signal-75dBm after again being decayed.Then repeated execution of steps 302, power level signal after again decaying and default interference threshold value are compared, if the power level signal after decay is less than default interference threshold value again, equipment 1 sends Frame A, if the power level signal after decay is still more than or equal to default interference threshold value again, equipment 1 repeated execution of steps 304 and step 302, until by power level signal attenuation to being less than interference threshold value, then send Frame A.In this application scene, equipment 1 repeats step 304 and step 302 2 times, and power level signal attenuation, to-85dBm, is less than to interference threshold value-76dBm, then sends Frame A.
Further, in another application scenarios of the embodiment of the present invention, can also monitor the packet loss of the first equipment sending data frame, described packet loss is the ratio that in data frame transfer, obliterated data number of frames accounts for transmitting data frame quantity.In the time that packet loss is more than or equal to default packet loss threshold value, show that on same frequency channels, other equipment that sending Frame can exert an influence to the correct receiving data frames of the receiver equipment of described the first equipment.As shown in Figure 4, when equipment 2 sends Frame C, equipment 1 needs to send continuously A and two Frames of B, is sending after Frame A the packet loss of Monitoring Data frame A.
If the packet loss of Frame A is less than or equal to packet loss threshold value, the power level signal that equipment 1 can obtain when sending Frame B according to original signal attenuation value is decayed.
If the packet loss of Frame A is greater than packet loss threshold value, be for example greater than 10%, equipment 1, in the time sending Frame B, as shown in Figure 5, need to be carried out following steps:
501, the first equipment reduces signal attenuation value.
The described signal attenuation value that reduces can realize by following two kinds of modes:
1) signal attenuation value is reduced by half, form new signal attenuation value.For example reduced by half to 5dBm by 10dBm, reduce thus attenuation degree.
2) described default signal attenuation value is deducted to default signal attenuation stepping, form new signal attenuation value.For example original signal pad value is 10dBm, and default signal attenuation stepping is 2dBm, with the signal attenuation value that original signal pad value subtraction signal decay stepping must make new advances be 8dBm.
Optionally, in the time that the packet loss of Frame A is more than or equal to packet loss threshold value, can also be not power level signal when sending Frame B decay.
502, described the first equipment is decayed to the power level signal again obtaining by the signal attenuation value after reducing.
503, described the first monitoring of equipment sends the packet loss of Frame again.
If when the packet loss of Frame B is greater than packet loss threshold value, repeated execution of steps 501,, according to two kinds of implementations that reduce signal attenuation value in step 501, reduces signal attenuation value again.
It should be noted that, reduce attenuation degree to Frame B or not the power level signal when sending Frame B decay, power level signal while not ensureing to send Frame B is necessarily more than or equal to interference threshold value, but reduce or not the power level signal when sending Frame B decay be more than or equal to interference threshold value so that this power level signal levels off to.Whether being less than interference threshold value according to power level signal, to determine whether to send Frame B be the implementation of prior art, according to existing CSMA/CA mechanism, if the power level signal while sending Frame B is less than interference threshold value, show that equipment 2 is not sending Frame C, now equipment 1 can send Frame B; If the power level signal while sending Frame B is more than or equal to interference threshold value, show that equipment 2 is sending Frame C, now equipment 1 does not send Frame B.
Further alternative, when the packet loss that sends Frame A when equipment 1 is more than or equal to packet loss threshold value, can also resend Frame A, described in resend Frame A can be with reference to the implementation of above-mentioned transmission Frame B, the embodiment of the present invention repeats no more this.
The parameter that can be used for the correct receiving data frames of characterization device in the embodiment of the present invention is not limited to packet loss.Parameter for other for the correct receiving data frames of characterization device, the implementation of its implementation when using packet loss as parameter is identical, repeats no more in the lump herein.
The method of the transfer of data that the embodiment of the present invention provides, before sending Frame, the power level signal of other equipment on the same frequency channels obtaining is decayed, and the power level signal of described other equipment is for characterizing the transmitting power size of other equipment sending data frames.If the power level signal after decay is less than default interference threshold value, send Frame., phase mutual interference distant at equipment and equipment can be similar under the scene of ignoring, and allows multiple devices to send Frame simultaneously, can improve the efficiency of transfer of data, makes full use of the transfer resource of channel.
In addition, the method of the transfer of data that the embodiment of the present invention provides, can also monitor the packet loss that sends Frame, in the time that packet loss is greater than the boundary value that can ensure correct transmitting data frame, in the process of follow-up transmission Frame, reduce or not to power level signal attenuation, to preferentially ensure the transmission success rate of Frame.
Referring to Fig. 6, be the equipment of a kind of transfer of data of providing of the embodiment of the present invention, in order to realize the method shown in Fig. 1 of the present invention and Fig. 3.Described equipment 60 can be the network measurement equipment including AP, can be also the terminal side equipment including work station.As shown in Figure 6, described equipment 60 comprises attenuator 61, comparator 62 and transmitter 63, wherein,
Described attenuator 61, decays for the power level signal to obtaining, the transmitting power size that described power level signal uses for characterizing other equipment.
Described comparator 62 compares for the power level signal after described attenuator 61 is decayed and default interference threshold value.
In the time that the power level signal after 61 decay of described attenuator is more than or equal to default interference threshold value, can think on channel and have other equipment sending Frame, its transmitting power can affect the correct Frame that sends of described equipment 60.In the time that the power level signal after described attenuator 61 decay is less than default interference threshold value, can think and there is no other equipment at transmission Frame on channel, described equipment 60 can send Frame.Between the setting of described interference threshold value and the transmitting power of other equipment, equipment, distance and transmission medium character are relevant.For example, transmitting power is greater than the be not more than-80dBm of interference threshold value of the equipment of 20dBm, can the equal-76dBm of interference threshold value of the equipment of transmitting power between 17dBm and 20dBm, transmitting power is less than or equal to can the equal-70dBm of interference threshold value of the equipment of 17dBm.Between equipment, distance is far away, and the path loss in equal transmission medium is just larger, so interference threshold value is corresponding smaller.The embodiment of the present invention that arranges for interference threshold value does not limit.
Described transmitter 63, in the time that the power level signal after described attenuator 61 decay is less than described interference threshold value, sends Frame.
Further, described attenuator 61 is decayed to described power level signal specifically for the signal attenuation value according to default.
Described signal attenuation value can be arranged according to the needs of practical application by network manager, and in the embodiment of the present invention, signal attenuation value describes as an example of 25dBm example, in practical application, signal attenuation value is not limited.
Further, in the time that the power level signal after 61 decay of described attenuator is more than or equal to described interference threshold value, described attenuator 61 also for according to described default signal attenuation value the power level signal after to described decay again decay.
Correspondingly, described comparator 62 also compares for power level signal and described interference threshold value after described attenuator 61 is decayed again.
When described transmitter 63 is also less than described interference threshold value for the power level signal after described attenuator 61 is decayed again, send Frame.
Further, as shown in Figure 7, described equipment 60 can also comprise monitor 71 and processor 72, for realizing the method shown in Fig. 5 of the present invention.
Described monitor 71 sends the packet loss of described Frame for monitoring described transmitter 63.
Described packet loss is the ratio that in data frame transfer, obliterated data number of frames accounts for transmitting data frame quantity.In the time that packet loss is more than or equal to default packet loss threshold value, show can be exerted an influence to the correct receiving data frames of the receiver equipment of described equipment 60 by multiple equipment transmission data frames on same frequency channels simultaneously.
When the packet loss of monitoring when described monitor 71 is more than or equal to default packet loss threshold value:
Described processor 72 for described default signal attenuation value is reduced by half, for example, is reduced by half to 5dBm by 10dBm, forms new signal attenuation value; For example, or for described default signal attenuation value is deducted to default signal attenuation stepping, original signal pad value is 10dBm, default signal attenuation stepping is 2dBm, forms new signal attenuation value.
It should be noted that, described processor 72 reduces attenuation degree to Frame B or power level signal when the power level signal when sending Frame B does not ensure to send Frame B is necessarily more than or equal to interference threshold value, but reduce or not the power level signal when sending Frame B decay be more than or equal to interference threshold value so that this power level signal levels off to.Whether being less than interference threshold value according to power level signal, to determine whether to send Frame B be the implementation of prior art.
Further, in equipment, can also comprise radio frequency link device, described radio frequency link device is for obtaining the power level signal of other equipment.Described radio frequency link device can be connected with described attenuator 61.
Or described radio frequency reception chain circuit device also can comprise described attenuator 61, described comparator 62 and described transmitter 63.
The equipment of the transfer of data that the embodiment of the present invention provides, include but are not limited to access node (the Access Point in WLAN (wireless local area network) WLAN, and work station (Station) AP), in other application scenarioss, there is the device of wireless data sending function or equipment and belong to equally the equipment described in the embodiment of the present invention, enumerate no longer one by one herein.In addition the equipment of the transfer of data described in the embodiment of the present invention has sending function and receiving function in embodiment of the method simultaneously, in order to ensure can to carry out interactive type communication between equipment in practical application.
In an application scenarios of the embodiment of the present invention, it is mutual that AP and Station carry out wireless data under semiduplex mode, and AP and Station can be served as and sent Frame, and when one side is during as transmit leg equipment, the opposing party is as receiver equipment.As shown in Figure 8, AP1 can only carry out data interaction with Station1, and AP2 can only carry out data interaction with Station2, and AP1, Station1, AP2 and Station2 carry out data interaction on same frequency channels.In the time that AP1 sends Frame A to Station1, because AP1 and Station2 are distant, the interference that the transmitting power of AP1 receives AP2 transmission Frame B to Station2 can be similar to be ignored.So the power level signal of the AP1 that now although AP2 obtains is higher than interference threshold value, but AP2 can be by the power level signal attenuation of AP1 to being less than interference threshold value, thereby when AP1 sends Frame A, AP2 can send Frame B to Station2, can realize thus on same frequency channels two and above equipment and send Frame simultaneously, save Internet resources.Station sends Frame to AP implementation as transmit leg equipment is identical with the mode that AP sends Frame, repeats no more herein.
The method and apparatus of the transfer of data that the embodiment of the present invention provides goes for various communication systems, these systems comprise: Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, be called for short WCDMA) system, Long Term Evolution (Long Term Evolution, be called for short LTE) system, global mobile communication (Global System for Mobile Communications is called for short GSM) system etc.
The technical scheme that adopts the embodiment of the present invention to provide, can, before sending Frame, decay the power level signal of other equipment on the same frequency channels obtaining.If the power level signal after decay is less than default interference threshold value, send Frame.Distant at equipment and equipment like this, phase mutual interference can be similar under the scene of ignoring, and allows multiple devices to send Frame simultaneously, can improve the efficiency of transfer of data, makes full use of the transfer resource of channel.Meanwhile, send the packet loss of Frame by monitoring, in the time that packet loss is greater than the boundary value that can ensure correct transmitting data frame, in the process of follow-up transmission Frame, reduces or not to power level signal attenuation, can ensure the transmission success rate of Frame.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, as the floppy disk of computer, hard disk or CD etc., comprise that some instructions are in order to make a computer equipment (can be personal computer, server, or equipment etc.) carry out the method described in each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (8)
1. a method for transfer of data, is characterized in that, comprising:
The power level signal obtaining is decayed, the transmitting power size that described power level signal uses for other network equipments that characterize on same frequency channels;
Power level signal after decay and default interference threshold value are compared;
In the time that the power level signal after described decay is less than described interference threshold value, on the identical frequency channels using with described other network equipments, send Frame to receiver equipment, wherein, the interference between described receiver equipment and described other network equipments can be similar to and ignore.
2. method according to claim 1, is characterized in that, described power level signal is decayed, and specifically comprises:
According to default signal attenuation value, described power level signal is decayed.
3. method according to claim 2, is characterized in that, described method also comprises: in the time that the power level signal after described decay is more than or equal to described interference threshold value,
Power level signal according to described default signal attenuation value after to described decay is decayed again;
Power level signal and described interference threshold value after again decaying are compared;
In the time that the power level signal after described decay is again less than described interference threshold value, on the identical frequency channels using with described other network equipments, send Frame.
4. according to the method in claim 2 or 3, it is characterized in that, send Frame on the described identical frequency channels using with described other network equipments after, described method also comprises:
Monitoring sends the packet loss of described Frame;
In the time that described packet loss is more than or equal to default packet loss threshold value, described default signal attenuation value is reduced by half, form new signal attenuation value; Or,
Described default signal attenuation value is deducted to default signal attenuation stepping, form new signal attenuation value.
5. an equipment for transfer of data, is characterized in that, comprises attenuator, comparator and transmitter, wherein,
Described attenuator is for the power level signal obtaining is decayed, and described power level signal is for characterizing the transmitting power size of other network equipments uses on same frequency channels;
Described comparator is for comparing the power level signal after described attenuator decay and default interference threshold value;
Described transmitter is in the time that the power level signal after described attenuator decay is less than described interference threshold value, on the identical frequency channels using with described other network equipments, send Frame to receiver equipment, wherein, the interference between described receiver equipment and described other network equipments can be similar to and ignore.
6. equipment according to claim 5, is characterized in that, described attenuator is decayed to described power level signal specifically for the signal attenuation value according to default.
7. equipment according to claim 6, it is characterized in that, in the time that the power level signal after described decay is more than or equal to described interference threshold value, described attenuator also for according to described default signal attenuation value the power level signal after to described decay again decay;
Described comparator also compares for the power level signal after described attenuator is decayed again and described interference threshold value;
When described transmitter is also less than described interference threshold value for the power level signal after described attenuator is decayed again, on the identical frequency channels using with described other network equipments, send Frame.
8. according to the equipment described in claim 6 or 7, it is characterized in that, described equipment also comprises:
Monitor, sends the packet loss of described Frame for monitoring described transmitter;
Processor, when being more than or equal to default packet loss threshold value when the packet loss of described monitor monitors,
Described default signal attenuation value is reduced by half, form new signal attenuation value;
Or, described default signal attenuation value is deducted to default signal attenuation stepping, form new signal attenuation value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210053629.3A CN102624483B (en) | 2012-03-02 | 2012-03-02 | Method and device for data transmission |
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