CN101997729A - Network control method and device - Google Patents
Network control method and device Download PDFInfo
- Publication number
- CN101997729A CN101997729A CN2009101092974A CN200910109297A CN101997729A CN 101997729 A CN101997729 A CN 101997729A CN 2009101092974 A CN2009101092974 A CN 2009101092974A CN 200910109297 A CN200910109297 A CN 200910109297A CN 101997729 A CN101997729 A CN 101997729A
- Authority
- CN
- China
- Prior art keywords
- network
- feedback information
- qos parameter
- frame number
- rtp packet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The embodiment of the invention discloses a network control method and device. The method comprises the following steps: acquiring service quality parameters of a network; determining the network state according to the service quality parameters; and when determining that the network is in congestion state according to the service quality parameters, sending a first feedback information to a source end, so that the source end increases the number of data frame packaged by a packet of a real-time transport protocol (RTP) according to the first feedback information. In the technical scheme provided by the embodiment of the invention, the network state is determined according to the service quality parameters of the network, when the network is in the congestion state, the number of the data frame packaged by the RTP data packets of the source end is increased, thereby effectively reducing the bandwidth required to occupy by the RTP packet; and when the network is congested, the flow can be reduced in time to avoid the re-congestion content, thereby effectively reliving the network congestion and improving the quality of the service transmission.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of network control method and device.
Background technology
VoIP (Voice over Internet Protocol) utilizes the Internet to carry out a kind of technology of speech transmissions.This technology with the simulation voice signal after overcompression and package, transmit at the environment of IP network with the form of data packet, be called the networking telephone or IP phone again.Compare with black phone, its cost is cheaper, and can the new multimedia service of convenient introducing.
Along with the maturation gradually of wireless technology, wireless self-organization network (Mobile Ad Hoc Network is called for short Ad hoc network) develops rapidly with its convenient and swift having obtained.It does not rely on existing network infrastructure, adopts distributed autonomous management, and it is simple to have a networking, advantages such as mobility strong.Wireless VoIP business on the Ad hoc network also is a kind of growing demand.Speech business is to time delay and the relatively responsive business of shake, time delay or shook interactivity and the comfortableness that conference influence speech, the reduction voice quality.Because how the unsteadiness of limited bandwidth and Radio Link guarantees that voice quality is the research emphasis of VoIP business in the Ad hoc network.
In the process that realizes the invention, the inventor finds: for reducing time delay, at IP (InternetProtocol, Internet Protocol) that online transmitting voice service use is udp protocol (User DatagramProtocol, User Datagram Protoco (UDP)), so that speech data can be transmitted fast, satisfy the real-time requirement of speech business.But udp protocol lacks flow control mechanism, easily produces network congestion, causes network delay and packet loss to rise, and burst long time delay phenomenon occurs, has a strong impact on voice quality.The problems referred to above do not exist only in the VoIP business field, are present in other real time business field, as fields such as video traffic, multimedia conference services yet.
Summary of the invention
The embodiment of the invention provides a kind of network control method and device, and at the transmission rate of network conditions adjustment source end, effectively alleviating network congestion improves network environment, improves quality of service.
The embodiment of the invention provides a kind of network control method, comprising: the QoS parameter that obtains network; Determine network state according to described QoS parameter; When determining that according to described QoS parameter network is in congestion state, send first feedback information to the source end, so that described source end increases the Frame number of realtime transmission protocol RTP packet encapsulation according to described first feedback information.
The embodiment of the invention provides another kind of network control method, comprising: obtain destination at first feedback information of determining according to the QoS parameter of network to send after network is in congestion state; Increase the Frame number of realtime transmission protocol RTP packet encapsulation according to described first feedback information.
The embodiment of the invention provides another network control method, comprising: the QoS parameter that obtains the network of destination transmission; Determine network state according to described QoS parameter; When determining that according to described QoS parameter network is in congestion state, according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet increases the realtime transmission protocol RTP packet encapsulation.
The embodiment of the invention provides a kind of network control unit, comprising: acquisition module is used to obtain the QoS parameter of network; First determination module is used for determining network state according to the QoS parameter that described acquisition module obtains; Feedback module, be used for when described first determination module determines that according to described QoS parameter network is in congestion state, send first feedback information to the source end, so that described source end increases the Frame number of realtime transmission protocol RTP packet encapsulation according to described first feedback information.
The embodiment of the invention provides another kind of network control unit, comprising: first receiver module is used to obtain destination at first feedback information of determining according to the QoS parameter of network to send after network is in congestion state; First adjusting module, first feedback information that is used for obtaining according to described first receiver module increases the Frame number of realtime transmission protocol RTP packet encapsulation.
The embodiment of the invention provides another network control unit, comprising: second receiver module is used to obtain the QoS parameter that destination sends; Second determination module is used for determining network state according to the QoS parameter that described second receiver module obtains; Second adjusting module, be used for when described second determination module determines that according to described QoS parameter network is in congestion state, according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet increases the realtime transmission protocol RTP packet encapsulation.
The technical scheme that is provided by the invention described above embodiment as can be seen, the embodiment of the invention adopts determines network state according to the QoS parameter of network, when being in congestion state, network increases the technological means of the Frame number of source end RTP packet encapsulation, thereby effectively reduce the bandwidth that the RTP packets need takies, occur to reduce flow timely to avoid the aggravate congestion degree when congested at network, thereby effectively alleviating network congestion has improved the quality of professional transmission.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the network control method flow chart of the embodiment of the invention one;
Fig. 2 is the network control method flow chart of the embodiment of the invention two;
Fig. 3 is the schematic diagram of the embodiment of the invention by basic access way access channel in Ad Hoc network;
Fig. 4 is the schematic diagram of the embodiment of the invention by RTS/CTS access way access channel in Ad Hoc network;
The network control method flow chart of Fig. 5 embodiment of the invention three;
The network control method flow chart of Fig. 6 embodiment of the invention four;
The network control method flow chart of Fig. 7 embodiment of the invention five;
The network control method flow chart of Fig. 8 embodiment of the invention six;
The network control unit structural representation of Fig. 9 embodiment of the invention seven;
The network control unit structural representation of Figure 10 embodiment of the invention eight;
The network control unit structural representation of Figure 11 embodiment of the invention nine;
The network control unit structural representation of Figure 12 embodiment of the invention ten.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The network control method of the embodiment of the invention one as shown in Figure 1, comprising:
The QoS parameter of S101, acquisition network;
S102, determine network state according to described QoS parameter;
S103, when determining that according to described QoS parameter network is in congestion state, send first feedback information to the source end, so that described source end increases the Frame number of realtime transmission protocol RTP packet encapsulation according to described first feedback information.
The network control method of the embodiment of the invention two as shown in Figure 2, comprising:
S201, acquisition destination are at first feedback information of determining according to the QoS parameter of network to send after network is in congestion state;
S202, increase the Frame number of realtime transmission protocol RTP packet encapsulation according to described first feedback information.
The embodiment of the invention is determined network state according to the QoS parameter of network, when being in congestion state, network increases the Frame number of source end RTP packet encapsulation, thereby effectively reduce the bandwidth that the RTP packets need takies, occur to reduce flow timely to avoid the aggravate congestion degree when congested at network, thereby effectively alleviating network congestion has improved the quality of professional transmission.
The technical scheme that the embodiment of the invention provides can be used for speech business, and other relate to the field of data packet technology also to can be used for video traffic, multimedia conference service etc.The technical scheme that the while embodiment of the invention provides can be used for cable network, also can be used for wireless network.
Be that example describes network control method of the present invention and device with the VoIP speech business in the Ad Hoc network below, the network control method in other service environments is identical with principle of device, does not repeat them here, still within protection scope of the present invention.
In Ad Hoc network, the same wireless medium of a plurality of nodes sharing, the source end at first needed competitive channel before the transmission data.Ad hoc network uses based on CSMA/CA (Carrier Sense MultipleAccess with Collision Avoidance, access/the conflict of carrier sense multiple spot is avoided) DCF (Distributed Coordination Function, distributed coordination function) pattern, the mode of its access channel have two kinds: basic access way and RTS/CTS access way.
Fig. 3 is basic access way schematic diagram, and before the transmission data, the source end is waited for a DIFS (DCFInter-Frame Space, DCF interFrameGap), and when knowing that network is idle, random back sends data (DATA) after a period of time.Destination is waited for a SIFS (Short Inter-Frame Space, short interFrameGap) back answer ACK (ACKnowledge Character, acknowledge character) after receiving data.And the RTS/CTS access way is before sending data, and at first the source end sends a RTS (Request To Send, request sends) frame and asks for permission, and just begins to send data after receiving destination CTS (Clear To Send allows to send) frame.Fig. 4 is a RTS/CTS access way schematic diagram, before sending data, the source end is waited for a DIFS, sending a RTS frame asks for permission, destination is replied the CTS frame after receiving and waiting for a SIFS behind this RTS frame, the source end just begins to send data after receiving and waiting for a SIFS behind the destination CTS frame, and destination is received after the data and replied ACK behind SIFS of wait.
As seen from the above analysis, transmit data in Ad hoc network, access channel can cause certain expense.
In a VoIP system, Real-time Transport Protocol (Real-time Transport Protocol, RTP) is used for actual transfer of data.Voice signal is encapsulated in the RTP and transmits after encoding through encoder compresses.In the prior art, the RTP packet carries the speech frame of fixed number, for avoiding introducing too much time delay, is generally 1-2, and a typical speech frame length is 10Bytes.And the packet header of the RTP packet that transmits in network is 74Bytes, comprises RTP head (12Bytes), UDP head (8Bytes), IP head (20Bytes) and MAC head (34Bytes).This has caused the huge waste of bandwidth.
As the above analysis, in Ad hoc network, transmit data, access channel can cause certain expense, and the packet header expense owing to the RTP packet that carries speech frame is very big again, the bandwidth that the needed bandwidth of transmitting voice information often can provide greater than network easily.Therefore be easy to occur congestion phenomenon on the network, cause that packets of voice is a large amount of in the process of transmission loses or introduce long time delay, cause voice quality to descend.
The network control method of the embodiment of the invention three as shown in Figure 5, comprising:
S301, destination obtain the QoS parameter of network.
As mentioned above, the technical scheme that the embodiment of the invention provides can be used for speech business, also can be used for video traffic, multimedia conference service etc.QoS parameter in the embodiment of the invention can be the speech business mass parameter; Also can be the video service quality parameter.Be that example describes with the VoIP speech business below, can carry out with reference to the method that the embodiment of the invention provides about other professional source-end networks control methods such as video traffic, multimedia conference services.
Because the decline of voice quality, can be adopted one or more as QoS parameter in end-to-end time delay, delay variation, packet loss and the MOS value generally because packet loss or time delay is excessive causes in the embodiment of the invention.That is to say that the QoS parameter that the embodiment of the invention obtains can be end-to-end time delay, delay variation, packet loss, or in the MOS value any one, also can be wherein several combinations, so whole.
Need to prove, the acquisition of above-mentioned QoS parameter is in order to judge network state, and network state can have multiple module, as average queue length, network throughput, source end data bag queuing delay, source end data bag packet loss, available bandwidth, average link layer number of retransmissions etc.In the embodiment of the invention; adopt end-to-end time delay, delay variation, packet loss; and the MOS value is that example describes as the voice quality of QoS parameter decision, and modules of other reflection network states are given unnecessary details no longer one by one, and are same within the protection range of the embodiment of the invention.
The method that destination is obtained the QoS parameter of network describes below:
S3011, destination obtain end-to-end time delay, delay variation and the packet loss of the packet of reception.
In the embodiment of the invention, the method that destination obtains QoS parameters such as packet end-to-end time delay, delay variation and packet loss can have multiple.Concrete, obtaining of packet end-to-end time delay can utilize Real-time Transport Protocol to realize.A timestamp field is arranged in the Real-time Transport Protocol head, and the value of the inside is the rise time of RTP bag.Destination deducts the network delay that timestamp can obtain this packet experience, i.e. end-to-end time delay with current system time after obtaining the RTP bag.Above-mentioned execution mode is a kind of asynchronous mode.In some execution mode, also can obtain accurate end-to-end time delay value by the method for system synchronization, so-called is exactly synchronously the system time unanimity of feasible transmitting-receiving section, but the computational methods of time delay value are constant, still are that current system time deducts timestamp.Delay variation can obtain by the difference of former and later two packet end-to-end time delay.Packet loss can also can calculate by the ratio of the bag number of receiving and the number of always giving out a contract for a project by the bag sequence number statistics of RTP bag, yet has other mode.In the embodiment of the invention, destination can obtain the needed value of QoS parameter from dithering cache or from other positions.
In the embodiment of the invention, QoS parameter obtains, and for prediction, these parameter values are more accurate, have bigger reference value.Concrete obtain manner can be varied, and the accuracy of different system requirements is different with complexity, can select own suitable obtain manner, but so long as in mode that destination obtains QoS parameter all within the protection range in the embodiment of the invention.
S3012, destination obtain voice quality MOS value according to end-to-end time delay and packet loss.
For speech business, people's subjective feeling to voice quality can directly reflect network conditions.The parameter of weighing voice quality can be MOS (Mean Opinion Score, average subjective opinion score) value, this is a kind of subjective evaluating method, the people answers and is investigated with the behavior of perceptual speech quality and quantize, hear the voice of which kind of rank quality, just obtain how many MOS branches.
The method of calculating MOS value can have multiple, such as PSQM (perception speech quality measurement method) model, PAMS (perception analysis mensuration) model, PESQ (perception speech Evaluation Method) model, E-Model model etc.Adopt in the embodiment of the invention ITU-T G.107 the E-Model in the standard calculate the MOS value.E-Model has taken all factors into consideration the influence of packet loss, time delay, shake and environment and circuit, and these factors are summed up in the point that in the formula, calculates a R parameter and describes voice quality.Computing formula is as follows:
R＝R
0-I
s-I
d-I
e-eff+A
Wherein, R
0The influence that the expression noise brings is as the interference of background noise and current noise.I
sExpression and the produced simultaneously influencing factors of quality of voice signal are as the interference of crossing strong band by quantification, connection noise and sidetone.A is the advantage parameter, and is relevant with the concrete applied environment of speech business.As the mobile voice service A value in the building is 5, and is 10 for the mobile voice service A value on the mobile traffic.G.107 for these values provide one group of default parameters, when terminal and applied environment are normal, can directly use this group default value, then this formula can be reduced to: R=93.2-I
d-I
E-eff
Wherein, I
dBe the time delay impairment value, it is relevant with end-to-end time delay.In some execution mode, can use the method for curve fit, provide one and calculate I
dSimplified style:
I
d=0.0024d+0.11 (d-177.3) U (d-177.3), wherein U (x) is a step function.D is an end-to-end time delay;
I
E-effBe the damage of introducing by low bit speed rate codec and packet loss, in some execution mode, I
E-effBut simple computation is I
E-eff=γ
1+ γ
2Ln (1+ γ
3E), wherein, e is a packet loss, γ
1γ
2γ
3Relevant with concrete codec.
Can obtain voice quality MOS value according to the R parameter, the conversion formula between R parameter and the MOS value is as follows:
MOS＝1+0.035R+7×10
-6R(R-60)(100-R)；R∈(0，100)
S302, destination are determined network state according to QoS parameter.
In the embodiment of the invention, destination can be determined network state according to the QoS parameter that obtains among the S301, promptly can be according in end-to-end time delay, delay variation, packet loss, the MOS value any one, perhaps network state is determined in the combination of above-mentioned each QoS parameter.
Now to determine that according to the MOS value network state is that example describes, MOS value is being acceptable more than 3.6 usually, and when network exists when congested, MOS value will sharply descend, so can be according to MOS value judgement network congestion situation.In the embodiment of the invention, network state can be divided into normal and congested two kinds of situations, when the MOS value more than or equal to 3.6 the time, think that network state is normal, when the MOS value smaller or equal to 3.6 the time, think that network state is congested.Certainly, be one as 3.6 of threshold value here and give an example, in actual applications, can set different threshold values according to actual conditions.
In some execution mode, also can be according to other QoS parameter, judge network state as packet loss, end-to-end time delay, delay variation, higher when packet loss, end-to-end time delay is bigger, or delay variation is when big, and it is congested to judge that then network state exists, in some execution mode, when the time delay of continuous several RTP packets surpasses 200ms, it is congested to judge that then network occurs.In the other execution mode, also can judge network state according to the combination between the QoS parameters such as MOS value, end-to-end time delay, delay variation, packet loss.
S303, destination send feedback information to the source end.
In the embodiment of the invention, after destination determines that network is in congestion state, send first feedback information to the source end.Described feedback information can be a network state information, is used for Xiang Yuanduan and indicates network and whether be in congestion state, so that the source end is adjusted transmission rate according to network state.First feedback information of the embodiment of the invention can be the information that network is in congestion state, is used for Xiang Yuanduan and indicates network and be in congestion state.In the embodiment of the invention, destination only sends first feedback information when network is in congestion state, and does not just often send feedback information in network state, thereby has saved feedback information taking bandwidth.
In the other execution mode, destination also can all send feedback information to the source end when network state is normal and congested.That is to say, be in congested transmission first feedback information at network, send second and feed back to the source end when network is in normal condition, second feedback information here can be the information that network is in normal condition, is used for Xiang Yuanduan and indicates network and be in normal condition.It can be that network congestion recovers normally afterwards that the network here is in normal condition, also can be the consistent normal of network state.This shows, send different feedback informations according to network state and can make the source end adjust transmission rate in real time according to network state.
S304, source end are adjusted the speech frame number of RTP packet according to feedback information.
In the embodiment of the invention, the source end can be adjusted transmission rate by the speech frame number that adjustment is encapsulated in the RTP packet.RTS/CTS access mechanism with above-mentioned Ad hoc network is that example describes below, and transmitting a needed bandwidth of RTP packet can be calculated as:
For IEEE 802.11b, the value of DIFS, SIFS, ACK, PHY is respectively 50 μ s, 10 μ s, 192 μ s, 56 μ s.RTS, CTS frame are respectively 80 μ s, 56 μ s.H is a packet head expense (74Bytes).Data rate R1 is 11Mbps, and controlling packet transmission rate R2 is 2Mbps.R is a speech encoding rate, and T is speech frame length (is unit with ms).The value of r and T is relevant with concrete codec, and r is 8kbps as G..729 efficient coding speed, G.723.1 is 6.3kbps or 5.3kbps, and the length T of the speech frame of G..729 is 10ms, G.723.1 is 20ms or 30ms.N is the speech frame number of carrying in the RTP packet.
Following table has provided to be used under the situation of codec G.729, when a RTP packet carries the speech frame of different numbers, and needed bandwidth:
| n | B(kbps) |
| 1 | 404.8 |
| 2 | 206.4 |
| 3 | 140.267 |
| 4 | 107.2 |
| 5 | 87.36 |
As seen from the above analysis, the speech frame number that the RTP packet carries is many more, and its bandwidth that need take is few more, promptly increases the transmission rate that speech frame number that the RTP packet carries can reduce the source end.When network congestion, increasing the speech frame number of carrying in the RTP packet is a kind of very effective method, by reducing the transmission rate of source end, can reduce the data traffic of injecting network significantly, reduce load, alleviating network congestion improves network condition, avoids long-term serious decline of voice quality.
The source end is received the feedback information that destination sends, and can increase the speech frame number in the RTP packet when network congestion, otherwise reduces the speech frame number, thus the transmission rate of the source of adjustment end.In some execution mode, if destination only sends first feedback information when network congestion in S303, then the source end can increase the speech frame number in the RTP packet after receiving first feedback information, reduces the transmission rate of source end.Concrete what speech frames that increase can preestablish, and also can set at random, as long as guarantee that not increasing excessive delay can realize purpose of the present invention again.If the source end does not continue to receive first feedback information that shows network congestion of destination transmission, the speech frame number that the source end can be after increasing the speech frame number of m RTP packet encapsulates in packet returns to the state that not have adjustment preceding, as 1-2 speech frame, also can gradually reduce the speech frame number of carrying in the RTP packet, thereby under the abundant situation of the network bandwidth, guarantee can not introduce unnecessary time delay.Here m can preestablish for greater than 1 integer.In the other execution mode, if destination is when network state is normal and congested, all send feedback information to the source end, promptly be in congested transmission first feedback information at network, when network is in normal condition, send second and feed back to the source end, then the source end can be adjusted transmission rate in real time according to feedback information, thus the more efficiently network bandwidth that utilizes.Under some situation, destination can send second feedback information after network returns to normal condition from congestion state, and then the source end reduces the speech frame number of RTP packet encapsulation according to second feedback information, thereby avoids introducing unnecessary time delay; Under some situation, destination always just often sends second feedback information in network state, and it is constant that then the source end can keep the speech frame number of RTP packet encapsulation.
The network control method that the embodiment of the invention provides, QoS parameter according to network, judge network state, and adjust the transmission rate of source end according to network state, when bandwidth ratio is rich, the speech frame number that the RTP packet encapsulation is less, when business increases in the network, easily cause network congestion and cause access delay and queuing delay to increase, when causing burst long time delay phenomenon, the source end increases the speech frame number of RTP packet encapsulation, reduce the shared bandwidth of speech business, reduce access delay and channel competition, thereby make network from congestion condition, recover as early as possible, improve voice quality.
Need to prove that for speech business, what encapsulate in the RTP packet is speech frame; For video traffic, what encapsulate in the RTP packet is frame of video; For other business, what encapsulate in the RTP packet may be other Frames.Various types of frames in the above-mentioned RTP of the being encapsulated in packet can be referred to as Frame.The embodiment of the invention is to be the explanation that example is carried out with the VOIP speech business; other relate to the field of data packet technology for video traffic, multimedia conference service etc.; so long as the Frame number of adjusting the RTP packet encapsulation according to network state is to adjust source end transmission rate, all within the protection range of the embodiment of the invention.
Provide the embodiment four of another kind of network control method below, as shown in Figure 6, the difference of this embodiment and embodiment three is:
In S302, destination determines that according to QoS parameter the method for network state is as follows:
S3021, destination obtain to be encapsulated in the speech frame number in the RTP packet.
In the embodiment of the invention, can obtain needs according to MOS value and end-to-end time delay and be encapsulated in speech frame number n in the RTP packet, n can obtain by several different methods, for example, according to the suggestion of ITU-T in G.114, end-to-end time delay is imperceptible any delay at 150ms with people's ear down, can be thresholding with 150ms, use simple curve fit mode, a computing formula that draws the speech frame number is as follows:
Wherein U (x) is a step function, and D is an end-to-end time delay, and T is the voice frame length of codec.The speech frame number n is that (T, D round on MOS) f.
S3022, destination are judged network state according to the speech frame number that obtains.
After obtaining the speech frame number n, can characterize different network states according to the number of speech frame, number is many more, illustrates that then network congestion is serious more, is badly in need of carrying out congested control.In some execution mode, also can preestablish a threshold value, when n during greater than threshold value decision network be in congestion state.
In S303, the feedback information that destination sends to the source end can be encapsulated in the speech frame number n in the RTP packet for the needs that destination calculates.Conspicuous, destination also can feed back the n value that all calculate as described in the embodiment three, also can be during greater than predetermined threshold value in the n value, and feedback n value is to the source end.
In S304, the source end is adjusted speech frame number in the RTP packet according to the n value of destination feedback, and in some execution mode, the source end can be with the n of reception as a speech frame numerical value that is encapsulated in the RTP packet; In the other execution mode, also can increase and decrease a speech frame numerical value that obtains being encapsulated in the RTP packet in right amount according to actual conditions with the n value that receives as a reference.
In the embodiment of the invention, destination obtains to be encapsulated in the speech frame number in the RTP packet, and this speech frame number fed back to the source end, thereby the source end of making can be more in real time, targetedly according to the speech frame number in the network state adjustment RTP packet, effectively reduce network congestion, improve the quality of voice transfer.
Provide the embodiment five of another kind of network control method below, as shown in Figure 7, the difference of this embodiment and embodiment four is:
Destination is preserved this speech frame number n after obtaining to be encapsulated in speech frame number n in the RTP packet, and preserving type can be only to preserve a nearest n, nearest several n, and perhaps whole n are all within embodiment of the invention protection range.
Different with S3022, in embodiment of the invention S3022 ', destination judges that according to the speech frame number that obtains the method for network state is as follows: after destination obtains to be encapsulated in speech frame number n in the RTP packet, judge whether the new n value that obtains is identical with a last n value, for convenience of explanation, the n value that newly obtains can be made as n1, a last n value is made as n0.N1 is identical with n0, and the network state that then illustrates does not change, and does not need the n1 value is transferred to the source end, can return the QoS parameter that S301 continues to obtain network; N1 and n0 are inequality to illustrate that then network state changes, if n1 is greater than n0, it is congested then may to be that network exists, if n1 is less than n0, then may be that network congestion is eased, or the bandwidth of network is further well-to-do, the n1 value can be transferred to the source end, so that the source end carries out network control according to the n1 value.
In the embodiment of the invention, destination is by relatively n1 and n0 determine network state, when n1 is identical with n0, do not send and feed back to the source end, thereby saved the required bandwidth that takies of feedback information, do not send the n1 value simultaneously to the source end at n1 and n0, thereby in real time, targetedly according to the speech frame number in the network state adjustment RTP packet, effectively reduce network congestion by increasing the speech frame number, effectively avoid introducing unnecessarily time delay by reducing the speech frame number, accomplish equilibrium treatment, effectively improved the quality of voice transfer.
Provide the embodiment six of another kind of network control method below, as shown in Figure 8:
S401, source end obtain the QoS parameter of the network of destination transmission.
The method of the QoS parameter of destination acquisition network can be identical with S301, adopts the QoS parameter of the method acquisition network among the S301, comprises speech business, also can be used for video traffic, multimedia conference service etc.With the VoIP speech business is example, and what the QoS parameter that is obtained can be in end-to-end time delay, delay variation, packet loss and the MOS value is one or more.In some execution mode, destination also can only obtain end-to-end time delay, delay variation and packet loss, does not obtain the MOS value at destination, the calculating of MOS value is placed on the source end carries out.
After destination obtains the QoS parameter of network, send the QoS parameter that obtains to the source end.
S402, source end are determined network state according to QoS parameter.
In the embodiment of the invention, can adopt destination among aforementioned several embodiment to determine the method for network state according to QoS parameter, different is with respect to previous embodiment, to determine that the main body of network state changes the source end into by destination.In some execution mode,, then when the source end need be determined network state according to the MOS value, need at first adopt the method among the S3012 to determine the MOS value if destination only transmits end-to-end time delay, delay variation, packet loss to the source end in S401.Certainly, shown in previous embodiment, the source end also may only need by terminal delay time, delay variation, packet loss, and does not determine network state by the MOS value.
S403, when determining that according to described QoS parameter network is in congestion state, according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet increases the realtime transmission protocol RTP packet encapsulation.
In the embodiment of the invention, can adopt the source end among aforementioned several embodiment to adjust the method for the speech frame number of RTP packet according to network state, thus the source of adjustment end speed.In some execution mode, only when network congestion, adjust, when determining that according to described QoS parameter network is in congestion state, according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet increases the realtime transmission protocol RTP packet encapsulation; In some execution mode, promptly congestion state is adjusted normal condition again, promptly when being in congestion state, network increases the speech frame number in the RTP packet, when determining that according to described QoS parameter network is in normal condition, according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet reduces or keep the realtime transmission protocol RTP packet encapsulation.
The source-end networks control method that the embodiment of the invention provides, be with the difference of previous embodiment, the judgement of network state is undertaken by the source end, realized the source end equally in real time, targetedly according to the speech frame number in the network state adjustment RTP packet, effectively reduce network congestion, improve the quality of voice transfer.
The network control unit of the embodiment of the invention seven as shown in Figure 9, comprising:
In the embodiment of the invention, the network servicequality parameter that acquisition module 701 obtains comprises speech business mass parameter or video service quality parameter; The speech business mass parameter comprises end-to-end time delay, delay variation, packet loss or MOS value.First determination module 702 determines that according to QoS parameter network state comprises: according to one in described end-to-end time delay, delay variation, packet loss or the MOS value, network state is determined in perhaps a plurality of combinations.
In some execution mode, feedback module 703 also is used for when described first determination module 702 determines that according to described QoS parameter network is in normal condition, send second feedback information to the source end, so that described source end reduces or keep the Frame number of RTP packet encapsulation according to described second feedback information.
The feedback information that feedback module 703 sends comprises: network state information maybe needs to be encapsulated in the Frame number in the RTP packet.
The network control unit of the embodiment of the invention eight as shown in figure 10, comprising:
First adjusting module 802 is used for the Frame number according to first feedback information increase realtime transmission protocol RTP packet encapsulation of described first receiver module 801 acquisitions.
In some execution mode, described first receiver module 801 also is used to obtain destination at second feedback information of determining according to the QoS parameter of network to send after network is in normal condition; Described first adjusting module 802 also is used for second feedback information minimizing that obtains according to described first receiver module 801 or the Frame number that keeps the realtime transmission protocol RTP packet encapsulation.
The feedback information that described first receiver module 801 receives comprises that network state information maybe needs to be encapsulated in the Frame number in the RTP packet.
The device that the embodiment of the invention provides, be used for determining network state according to the QoS parameter of network, when being in congestion state, network increases the Frame number of source end RTP packet encapsulation, thereby effectively reduce the bandwidth that the RTP packets need takies, the transmission rate of reduction source end, flow occurs to reduce timely when congested avoiding the aggravate congestion degree at network, thereby effective alleviating network congestion has improved the quality of professional transmission.
Provide the embodiment of the invention nine below, associated methods embodiment is further detailed network control unit of the present invention, as shown in figure 11:
The embodiment of the invention can be applied to the multiple business environment as previously mentioned, is that example describes at this with the VoIP speech business in the Ad Hoc network.In the embodiment of the invention, network control unit comprises destination device and source end device, and destination comprises acquisition module 701, first determination module 702 and feedback module 703, and the source end comprises first receiver module 801 and first adjusting module 802.
In some execution mode, acquisition module 701 obtains the QoS parameter of network, comprises end-to-end time delay, delay variation and the packet loss of the packet that obtains reception, again according to end-to-end time delay and packet loss, obtains voice quality MOS value.First determination module 702 is according to the one or more definite network state in the QoS parameter of acquisition module 701 acquisitions, and described definite method can be to preestablish a threshold value, determines network state according to the relation of QoS parameter and threshold value.Feedback module 703 sends feedback information to receiver module 801 after first determination module 702 is determined network state, feedback information can be a network state information.In some execution mode, can when being in congestion state, network send feedback information, promptly be used for first feedback information that surface network is in congestion state, and in network state just often, not sending feedback information, such benefit is to save feedback information taking bandwidth; In the other execution mode, feedback module 703 also can be when network state be normal and congested, all send feedback information, promptly when being in congestion state, network sends first feedback information, transmission shows normal second feedback information of network when network is in normal condition, and this method can make the source end adjust transmission rate in real time according to network state.First receiver module 801 obtains the feedback information that feedback module 703 sends.First adjusting module 802 is adjusted the speech frame number of RTP packet according to feedback information, thereby the transmission rate of the source of adjustment end comprises that first feedback information that obtains according to first receiver module 801 increases the Frame number of realtime transmission protocol RTP packet encapsulation; Reduce or keep the Frame number of realtime transmission protocol RTP packet encapsulation according to second feedback information of first receiver module, 801 acquisitions.
In some execution mode, first determination module 702 determines that the method for network state can be the speech frame number that obtains to be encapsulated in the RTP packet, judges network state according to the speech frame number that obtains.The feedback information of feedback module 703 transmissions this moment can be encapsulated in the speech frame number in the RTP packet for the needs that first determination module 702 obtains.The speech frame number adjustment that first adjusting module 802 is encapsulated in the RTP packet as required is encapsulated in the interior speech frame number of RTP packet.Under this execution mode, the source end can according to the speech frame number in the network state adjustment RTP packet, effectively reduce network congestion more targetedly, improves the quality of voice transfer.
In some execution mode, first determination module 702 is encapsulated in speech frame number in the RTP packet by the needs of judging new acquisition and whether is encapsulated in the needs of a last acquisition that speech frame number in the RTP packet is identical judges network state, when identical then the source end do not need to adjust, not simultaneously then the source end need to adjust.Under this execution mode, can when network state does not change, not send and feed back to the source end, thereby saved the required bandwidth that takies of feedback information; When network state changes, in time send and feed back to the source end, thereby in real time, targetedly according to the speech frame number in the network state adjustment RTP packet, effectively reduce network congestion by increasing the speech frame number, effectively avoid introducing unnecessarily time delay by reducing the speech frame number, accomplish equilibrium treatment, effectively improved the quality of voice transfer.
The network control unit of the embodiment of the invention ten as shown in figure 12, comprising:
Network control unit below in conjunction with six pairs of present embodiments of method embodiment describes, and acquisition module 701 obtains the QoS parameter of network, can include only end-to-end time delay, delay variation and packet loss, and leaves the acquisition of MOS value for source end operation.Second receiver module 901 obtain that feedback modules 703 send QoS parameter.Second determination module 902 is determined network state according to QoS parameter, and under some situation, second determination module 902 also can be used for obtaining the MOS value according to end-to-end time delay and packet loss.Second adjusting module 903 is adjusted the speech frame number of RTP packet according to network state.In some execution mode, only when network congestion, adjust, when second determination module 902 determines that according to described QoS parameter network is in congestion state, second adjusting module 903 according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet increases the realtime transmission protocol RTP packet encapsulation; In some execution mode, promptly congestion state is adjusted normal condition again, promptly second adjusting module 903 increases the speech frame number in the RTP packet when network is in congestion state, when second determination module 902 determines that according to described QoS parameter network is in normal condition, second adjusting module 903 according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet reduces or keep the realtime transmission protocol RTP packet encapsulation.Under this execution mode, the judgement of network state is undertaken by the source end, has realized the source end equally in real time, according to the speech frame number in the network state adjustment RTP packet, effectively reduces network congestion targetedly, improves the quality of voice transfer.
Because preceding method embodiment has compared in detail, specific description, the network control unit associated methods in the embodiment of the invention has carried out relatively simply describing, and specific implementation can not repeat them here referring to the description of method embodiment.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, can instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (15)
1. a network control method is characterized in that, described method comprises:
Obtain the QoS parameter of network;
Determine network state according to described QoS parameter;
When determining that according to described QoS parameter network is in congestion state, send first feedback information to the source end, so that described source end increases the Frame number of realtime transmission protocol RTP packet encapsulation according to described first feedback information.
2. network control method according to claim 1 is characterized in that, described QoS parameter comprises speech business mass parameter or video service quality parameter; Described speech business mass parameter comprises end-to-end time delay, delay variation, packet loss or MOS value; Describedly determine that according to described QoS parameter network state comprises:
Determine network state according in described end-to-end time delay, delay variation, packet loss or the MOS value one or more.
3. network control method according to claim 1 is characterized in that, described determine network state according to described QoS parameter after, described method also comprises:
When determining that according to described QoS parameter network is in normal condition, send second feedback information to the source end, so that described source end reduces or keep the Frame number of RTP packet encapsulation according to described second feedback information.
4. according to each described network control method of claim 1 to 3, it is characterized in that described feedback information comprises:
Network state information maybe needs to be encapsulated in the Frame number in the RTP packet.
5. a network control method is characterized in that, described method comprises:
Obtain destination at first feedback information of determining according to the QoS parameter of network to send after network is in congestion state;
Increase the Frame number of realtime transmission protocol RTP packet encapsulation according to described first feedback information.
6. network control method according to claim 5 is characterized in that, described method also comprises:
Obtain destination at second feedback information of determining according to the QoS parameter of network to send after network is in normal condition;
Reduce or keep the Frame number of realtime transmission protocol RTP packet encapsulation according to described second feedback information.
7. according to claim 5 or 6 described network control methods, it is characterized in that described feedback information comprises:
Network state information maybe needs to be encapsulated in the Frame number in the RTP packet.
8. a network control method is characterized in that, described method comprises:
Obtain the QoS parameter of the network of destination transmission;
Determine network state according to described QoS parameter;
When determining that according to described QoS parameter network is in congestion state, according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet increases the realtime transmission protocol RTP packet encapsulation.
9. a network control unit is characterized in that, described device comprises:
Acquisition module is used to obtain the QoS parameter of network;
First determination module is used for determining network state according to the QoS parameter that described acquisition module obtains;
Feedback module, be used for when described first determination module determines that according to described QoS parameter network is in congestion state, send first feedback information to the source end, so that described source end increases the Frame number of realtime transmission protocol RTP packet encapsulation according to described first feedback information.
10. network control unit according to claim 9 is characterized in that:
Described feedback module, also be used for when described first determination module determines that according to described QoS parameter network is in normal condition, send second feedback information to the source end, so that described source end reduces or keep the Frame number of RTP packet encapsulation according to described second feedback information.
11., it is characterized in that according to claim 9 or 10 described network control units:
The feedback information that described feedback module sends comprises that network state information maybe needs to be encapsulated in the Frame number in the RTP packet.
12. a network control unit is characterized in that, described device comprises:
First receiver module is used to obtain destination at first feedback information of determining according to the QoS parameter of network to send after network is in congestion state;
First adjusting module, first feedback information that is used for obtaining according to described first receiver module increases the Frame number of realtime transmission protocol RTP packet encapsulation.
13. network control unit according to claim 12 is characterized in that:
Described first receiver module also is used to obtain destination at second feedback information of determining according to the QoS parameter of network to send after network is in normal condition;
Described first adjusting module, second feedback information that also is used for obtaining according to described first receiver module reduces or keeps the Frame number of realtime transmission protocol RTP packet encapsulation.
14., it is characterized in that according to claim 12 or 13 described network control units:
The feedback information that described first receiver module receives comprises that network state information maybe needs to be encapsulated in the Frame number in the RTP packet.
15. a network control unit is characterized in that, described device comprises:
Second receiver module is used to obtain the QoS parameter that destination sends;
Second determination module is used for determining network state according to the QoS parameter that described second receiver module obtains;
Second adjusting module, be used for when described second determination module determines that according to described QoS parameter network is in congestion state, according to network state information maybe needs be encapsulated in the Frame number that Frame number in the RTP packet increases the realtime transmission protocol RTP packet encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101092974A CN101997729A (en) | 2009-08-12 | 2009-08-12 | Network control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101092974A CN101997729A (en) | 2009-08-12 | 2009-08-12 | Network control method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101997729A true CN101997729A (en) | 2011-03-30 |
Family
ID=43787362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101092974A Pending CN101997729A (en) | 2009-08-12 | 2009-08-12 | Network control method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101997729A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298028A (en) * | 2012-03-02 | 2013-09-11 | 华为技术有限公司 | Data package processing method and equipment |
| CN103906140A (en) * | 2012-12-28 | 2014-07-02 | 中国移动通信集团公司 | Data transmission dynamic regulation method and equipment |
| CN105141542A (en) * | 2015-09-18 | 2015-12-09 | 北京百度网讯科技有限公司 | TCP communication protocol-based congestion window control algorithm and system |
| CN105187167A (en) * | 2015-09-28 | 2015-12-23 | 广州市百果园网络科技有限公司 | Voice data communication method and device |
| CN105284077A (en) * | 2013-04-10 | 2016-01-27 | 感觉媒体 | VoIP bandwidth management |
| CN105763942A (en) * | 2016-04-22 | 2016-07-13 | 烽火通信科技股份有限公司 | Calculating method of IPTV set top box VMOS value |
| WO2017004814A1 (en) * | 2015-07-08 | 2017-01-12 | 华为技术有限公司 | User equipment and network side equipment, and method of determining processing mode for data packet |
| CN106817252A (en) * | 2016-12-31 | 2017-06-09 | 中国移动通信集团江苏有限公司 | Internet data processing method and processing device |
| WO2018019102A1 (en) * | 2016-07-27 | 2018-02-01 | 华为技术有限公司 | Bandwidth adjustment method, device and system in video communication process |
| CN108040341A (en) * | 2018-01-26 | 2018-05-15 | 北京德立信通科技有限公司 | A kind of VoLTE network voice qualities integrated relational analysis method and system |
| CN108259364A (en) * | 2016-12-29 | 2018-07-06 | 中国移动通信集团浙江有限公司 | A kind of network congestion determines method and device |
| CN109215317A (en) * | 2018-09-13 | 2019-01-15 | 泉州市信贵机械设备有限公司 | Numerically-controlled machine tool control method and system based on wireless network |
| CN109996285A (en) * | 2017-12-29 | 2019-07-09 | 中国移动通信集团四川有限公司 | Method for controlling network congestion, device, equipment and medium |
-
2009
- 2009-08-12 CN CN2009101092974A patent/CN101997729A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298028A (en) * | 2012-03-02 | 2013-09-11 | 华为技术有限公司 | Data package processing method and equipment |
| CN103298028B (en) * | 2012-03-02 | 2016-12-14 | 华为技术有限公司 | Data package processing method and equipment |
| CN103906140B (en) * | 2012-12-28 | 2018-05-08 | 中国移动通信集团公司 | A kind of data transfer dynamic adjusting method and equipment |
| CN103906140A (en) * | 2012-12-28 | 2014-07-02 | 中国移动通信集团公司 | Data transmission dynamic regulation method and equipment |
| CN105284077A (en) * | 2013-04-10 | 2016-01-27 | 感觉媒体 | VoIP bandwidth management |
| WO2017004814A1 (en) * | 2015-07-08 | 2017-01-12 | 华为技术有限公司 | User equipment and network side equipment, and method of determining processing mode for data packet |
| CN105141542A (en) * | 2015-09-18 | 2015-12-09 | 北京百度网讯科技有限公司 | TCP communication protocol-based congestion window control algorithm and system |
| CN105141542B (en) * | 2015-09-18 | 2019-04-02 | 北京百度网讯科技有限公司 | The control algolithm and system of congestion window based on TCP communication agreement |
| CN105187167A (en) * | 2015-09-28 | 2015-12-23 | 广州市百果园网络科技有限公司 | Voice data communication method and device |
| CN105187167B (en) * | 2015-09-28 | 2018-11-06 | 广州市百果园网络科技有限公司 | A kind of voice data communication method and device |
| CN105763942A (en) * | 2016-04-22 | 2016-07-13 | 烽火通信科技股份有限公司 | Calculating method of IPTV set top box VMOS value |
| CN105763942B (en) * | 2016-04-22 | 2018-01-02 | 烽火通信科技股份有限公司 | A kind of computational methods of IPTV set top box VMOS values |
| CN107666689A (en) * | 2016-07-27 | 2018-02-06 | 华为技术有限公司 | Bandwidth adjusting method, equipment and system in a kind of video communication |
| WO2018019102A1 (en) * | 2016-07-27 | 2018-02-01 | 华为技术有限公司 | Bandwidth adjustment method, device and system in video communication process |
| CN108259364A (en) * | 2016-12-29 | 2018-07-06 | 中国移动通信集团浙江有限公司 | A kind of network congestion determines method and device |
| CN106817252A (en) * | 2016-12-31 | 2017-06-09 | 中国移动通信集团江苏有限公司 | Internet data processing method and processing device |
| CN106817252B (en) * | 2016-12-31 | 2019-11-05 | 中国移动通信集团江苏有限公司 | Internet data processing method and processing device |
| CN109996285A (en) * | 2017-12-29 | 2019-07-09 | 中国移动通信集团四川有限公司 | Method for controlling network congestion, device, equipment and medium |
| CN109996285B (en) * | 2017-12-29 | 2022-09-06 | 中国移动通信集团四川有限公司 | Network congestion control method, device, equipment and medium |
| CN108040341A (en) * | 2018-01-26 | 2018-05-15 | 北京德立信通科技有限公司 | A kind of VoLTE network voice qualities integrated relational analysis method and system |
| CN109215317A (en) * | 2018-09-13 | 2019-01-15 | 泉州市信贵机械设备有限公司 | Numerically-controlled machine tool control method and system based on wireless network |
| CN109215317B (en) * | 2018-09-13 | 2020-12-11 | 福建省庆川数控机械有限公司 | Numerical control machine tool control method and system based on wireless network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101997729A (en) | Network control method and device | |
| Shin et al. | Measurement and Analysis of the VoIP Capacity in IEEE 802.11 WLAN | |
| CN101313536B (en) | Video packet shaping for video telephony | |
| Garg et al. | An experimental study of throughput for UDP and VoIP traffic in IEEE 802.11 b networks | |
| EP2206298B1 (en) | Wireless transmission rate control method | |
| US8081614B2 (en) | Voice transmission apparatus | |
| CN101257419B (en) | Wireless VOIP voice frame combining method as well as radio device | |
| KR20070003701A (en) | Power consumption reduction logic for unschelduled apsd and real time services | |
| Zhang et al. | HARMONICA: enhanced QoS support with admission control for IEEE 802.11 contention-based access | |
| CN101455086A (en) | Video error control based on reverse link information | |
| CN101438550A (en) | Adaptive voice packetization | |
| Kuriakose et al. | Analytical models for capacity estimation of IEEE 802.11 WLANs using DCF for internet applications | |
| Gao et al. | Improving WLAN VoIP capacity through service differentiation | |
| Narbutt et al. | Gauging VoIP call quality from 802.11 WLAN resource usage | |
| Shin et al. | Call admission control in IEEE 802.11 WLANs using QP-CAT | |
| Yuan et al. | iVoIP: an intelligent bandwidth management scheme for VoIP in WLANs | |
| Yasukawa et al. | Distributed delay estimation and call admission control in IEEE 802.11 WLANs | |
| Wiethölter et al. | Perceptual quality of internet telephony over IEEE 802.11 e supporting enhanced dcf and contention free bursting | |
| Mohd et al. | Performance of Voice over IP (VoIP) over a wireless LAN (WLAN) for different audio/voice codecs | |
| CN113179534A (en) | Wireless transmission quality assessment method and device | |
| Li et al. | Variable bit rate VoIP in IEEE 802.11 e wireless LANs | |
| Narbutt et al. | Experimental investigation on VoIP performance and the resource utilization in 802.11 b WLANs | |
| Wiethoelter | Virtual utilization and voip capacity of wlans supporting a mix of data rates | |
| Narbutt et al. | Experimental tuning of AIFSN and CWmin parameters to prioritize voice over data transmission in 802.11 e WLAN networks | |
| Siddique et al. | VoIP capacity over PCF with imperfect channel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110330 |