CN101039254A - Media data regrouping method and packet server - Google Patents
Media data regrouping method and packet server Download PDFInfo
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Abstract
The invention discloses a reorganization method of media data and a group packaging server, the group packaging server comprised a data buffer unit and a data packaging unit is used to recombine the data packages. The data buffer unit is used to queue the received data packages and then send the queued data packages group to the data packaging unit, the data packaging unit is used to recombine the queued data packages group. The reorganization method of media data includes the following steps: Step A, queuing the received data packages; Step B, recombining the data packages that will be sent the same access point. The invention can effectively improve the utilization of bandwidth and downlink efficiency of media data.
Description
Technical field
The present invention relates to the multimedia transmission field, particularly relate to a kind of media data recombination method and group packet server.
Background technology
WIFI (Wireless Fidelity) is based on the wireless local area network technology of 802.11 series, under the WIFI network environment, support two kinds of channel access modes: based on distributed access mode (DCF) and the centralized control on this (PCF) of CSMA/CA (carrier sense/conflict is avoided).
Wireless device is operated in the following time of pattern based on access point, and a plurality of wireless devices generally adopt CSMA/CA channel access mode sharing wireless channel.Under this kind mechanism, wireless device at first obtains the Radio Link right to use by competition, then packet is uploaded to access point, and the packet that access point is sent wireless device carries out buffer memory, and after the control that obtains wireless network, this packet is sent to target device.But under this kind mechanism, because it is more to connect the wireless device of access point, when network traffics were big, packet can be assembled at the access point place, causes the up-downgoing speed of wireless transmission asymmetric.Downstream rate significantly descends because access point can't obtain the network right to use, and this is little for the general data service impact, but will produce considerable influence for real-time voice/video transmission task.
The signal of existing real-time multimedia transmitting system as shown in Figure 1, this real-time multimedia transmitting system comprises a plurality of subscriber equipmenies, a plurality of access point and at least one location-server, location-server is used to realize user identity management, and the user charges, and station address is searched etc.At present, the server of realizing these functions has: during VOIP uses based on the sip proxy server of Session Initiation Protocol and location-server and based on the gatekeeper of agreement H.323.
The concrete transmission course of media data in this real-time multimedia transmitting system (comprising voice and video) transmission is described below with reference to Fig. 1.Among Fig. 1, solid line represents to control the transmission course of signaling, the transmission course of dotted line presentation medium data.
At first, source user equipment is to the local user profile of location-server registration;
When calling out beginning, source user equipment is initiated connection request to location-server, location-server sends control signalings such as media channel negotiation, flow control, authentication and charging to the purpose subscriber equipment, and the control signaling of purpose subscriber equipment feedback is transferred back to source user equipment.
After source user equipment was received the control signaling of purpose subscriber equipment feedback, direct and purpose subscriber equipment connected;
Then, source user equipment and purpose subscriber equipment carry out the multi-medium data transmission.
Wherein, source user equipment is meant the transmit leg of data, and the purpose subscriber equipment is meant the recipient of data.Same subscriber equipment both can be used as source user equipment, also can be used as the purpose subscriber equipment.Because access point can't obtain the network right to use, therefore access point data downstream speed can not solve the asymmetric problem of up-downgoing speed of wireless transmission with restricted in this scheme.
Widespread usage 802.11 standards in multi-media transmission system at present, because, after terminal obtains the network right to use, transmit for the real-time audio and video media stream data, the time of transmitting a packet is very short, therefore, the utilance of lifting grouping efficient and wireless bandwidth is one of difficult point that promotes at present end-to-end audio frequency and video service quality.
In order to promote the utilance of grouping efficient and wireless bandwidth, a lot of new standards are arranged, such as 802.11e.This standard is the technical standard that is used to improve online audio frequency of wireless local and video quality by the IEEE definition, and voice, video, the service of doing one's best and four kinds of discharge patterns of backstage service have been defined, this four types every kind formation that oneself is all arranged, this just makes packet obtain different priority levels.This definition of four types can change.Belong to any type in order to tell each packet, this standard has been used and the similar identifier of Ethernet.In transmission course, after access point detects these identifiers, give VoP the highest priority, next be video packets of data.
Though 802.11e can combine, prevent to collide between the packet with other mechanism,, the problem that it exists is that this standard has been given client with the power of prioritization.Yet, in larger deployed environment,, should give the server or the network mechanism of centralized management with controlling power in order to improve the real-time of voice/video transmission, make access point obtain the network right to use.In addition, need comprehensively upgrade to the network equipment, can't improve the wireless operating efficiency of the equipment of not supporting new standard based on the mechanism of this standard.Under the situation of new equipment and old equipment mixing use, the wireless operating efficiency of whole network is significantly descended.Equally, this scheme can't be coordinated the data that send on the whole WiFi network, therefore can't reach optimum dispatching effect.
In view of this, need provide a kind of and can improve grouping efficient, thus the method and apparatus of the utilance of raising wireless bandwidth.
Summary of the invention
In order to address the above problem, one object of the present invention just provides a kind of media data recombination method, in the process that once sends, send the media data packet of a plurality of terminals under the same access point, effectively promote bandwidth availability ratio and downlink efficiency of media data.
Another object of the present invention is to, a kind of group of packet server is provided, be used for media data packet is recombinated, effectively promote bandwidth availability ratio and downlink efficiency of media data.
Media data recombination method of the present invention may further comprise the steps:
Steps A is ranked to the packet of receiving;
Step B, the packet that will send to same access point is recombinated.
Of the present invention group of packet server comprises:
Data buffer unit is used for the packet that receives is ranked, and the data packet queue after will lining up sends to data set bag unit;
Data set bag unit is used for the data packet queue after the queuing is recombinated.
Of the present invention group of packet server further comprises registering unit, authentication unit and network condition memory cell, wherein,
Registering unit is used to receive register requirement, and log-on message is saved in the network condition memory cell;
Authentication unit is used for behind the packet that receives from subscriber equipment, judges according to the log-on message of preserving in the network condition memory cell whether described subscriber equipment has been registered to the group packet server.
The invention has the beneficial effects as follows:
By the group packet server to the media data packet reorganization of ranking, a plurality of parcels are formed one wrap and carry out the packet header compression greatly and handle, thereby improved clean He ratio, and wrap by directly sending greatly, can promote bandwidth availability ratio and data transmission efficiency; And
2. manage concentratedly by media data, and, significantly promote the channel utilization of WiFI network under the whole network condition, make the downlink bandwidth of access point significantly promote according to queuing and reorganization that data traffic is wrapped to whole network.
Description of drawings
Fig. 1 is the schematic diagram of existing real-time voice/video transmission scheme;
Fig. 2 is the Organization Chart of the adaptable multi-media transmission system of media data recombination method of the present invention;
Fig. 3 is the schematic diagram of agent client module;
Fig. 4 is the schematic diagram of group packet server;
Fig. 5 is the flow chart of multimedia transmission method;
Fig. 6 is the flow chart of media data recombination method of the present invention;
Fig. 7 is the organization chart of queuing back packet;
Fig. 8 is a structure chart of organizing the packet behind the bag again;
Fig. 9 is the flow chart of the process that abandons by the type and the content of packet.
Embodiment
Media data recombination method of the present invention can be applied under as shown in Figure 2 the multi-media transmission system.In Fig. 2, this multi-media transmission system comprises a plurality of subscriber equipmenies, a plurality of agent client module, a plurality of access point, a group packet server and at least one location-server, and wherein, a plurality of access points are connected with this group packet server.
Be that with existing real-time voice/video transmission scheme difference real-time multimedia transmitting system of the present invention has increased group packet server and agent client module.Wherein, the group packet server is used for media data packet is recombinated; The agent client module is used to carry out connection, registration and the call request between source user equipment and the purpose subscriber equipment.The agent client module is corresponding one by one with subscriber equipment, can be positioned at subscriber equipment inside, also can be positioned at the subscriber equipment outside.
Fig. 3 is the schematic diagram of agent client module.As shown in Figure 3, the agent client module comprises Signaling Processing Unit, register requirement unit and data set bag/unwrapper unit.
Wherein, Signaling Processing Unit is resolved the control signaling that subscriber equipment sends, and will control signaling and be forwarded to the correct positioning server, and, after the control signaling of receiving the location-server feedback, it is resolved, and issue corresponding user equipment.
The register requirement unit is used for the register requirement of subscriber equipment is sent to the group packet server.
The a plurality of parcels that need in the packet of data set bag/unwrapper unit with the subscriber equipment transmission to send to same access point are formed a big bag, send to the group packet server, and the packet that the group packet server is transmitted unpacks, find out the packet that belongs to this subscriber equipment, abandon the packet that does not belong to this subscriber equipment, and the packet that will belong to this subscriber equipment is reduced into the form of User Recognition.
Fig. 4 is the schematic diagram of group packet server.As shown in Figure 4, this group packet server comprises registering unit, authentication unit, data buffer unit, data set bag unit and network condition memory cell.
Wherein, registering unit receives the register requirement of agent client module, and network condition descriptor such as the address of the access point that will be connected with this agent client module and user equipment information are saved in the network condition memory cell.
The group packet server at first, judges according to the network condition of the access point of storing in the network condition memory cell whether subscriber equipment has been registered to the group packet server by authentication unit after receiving the media data packet that subscriber equipment sends by access point.If subscriber equipment is registered, media data packet to be delivered to data buffer unit packet is ranked, data buffer unit is sent to data set bag unit with packet, by data set bag unit the packet of receiving is recombinated.Otherwise notifying user equipment is registered.
Owing to increased group packet server and agent client module, the media data transmission course of real-time multimedia transmitting system of the present invention comprises control signaling transmission course S, subscriber equipment and group packet server registration process R, media data transmission course D.
Media data transmission course below with reference to Fig. 2 and 5 these systems of explanation.In Fig. 2, solid line represents to control the transmission course of signaling, and dotted line is represented registration process and data transmission procedure.
At first, source user equipment sends and feedback control signaling by agent client module, access point and location-server and purpose subscriber equipment, and this process is expressed as control signaling transmission course S in Fig. 2;
The agent client module is to group packet server information of registered users, and this process is expressed as group packet server registration process R in Fig. 2;
Then, source user equipment sends media data packet to the agent client module, the agent client module is sent to the group packet server by access point with media data packet, the group packet server is ranked for all packets that receive, the packet that sends to different access points is distinguished and recombinated, make and only comprise the media data packet that mails to same access point in the packet of each reorganization, and the packet after will recombinating sends to the agent client module of purpose subscriber equipment by access point, send to the purpose subscriber equipment after unpacking processing by the agent client module, this process is expressed as media data transmission course D in Fig. 2.
Concrete, multimedia transmission method comprises the steps: as shown in Figure 5
Step 10, subscriber equipment sends packet to its corresponding agent client module, comprises control signaling and voice/video data in this packet.The Signaling Processing Unit of agent client module is resolved the signaling request that subscriber equipment sends, and will control signaling and send to location-server.Should control signaling by location-server and send to the purpose subscriber equipment.After the purpose subscriber equipment is received this control signaling, the control signaling is responded, and feedback control corresponding signaling is to location-server.
Step 20, location-server sends to the agent client module with the control signaling of purpose subscriber equipment feedback, then, will control signaling by the agent client module and submit source user equipment to.
Described control signaling comprises media channel negotiation, flow control, authentication and charging etc.
Step 30, the wireless network identification of the subscriber equipment corresponding with the agent client module and the address of the access point that links to each other with subscriber equipment are uploaded to the group packet server in the register requirement unit of agent client module, user equipment registration to the group packet server, is set up media channel.
Described step 30 also can be carried out before step 1.
Step 40, agent client module judge in the packet that subscriber equipment sends whether comprise the voice/video data, if comprise these data, by the agent client module voice/video data are submitted to registered group of packet server by access point.
Step 50, the group packet server receives this packet, and this packet is submitted to data buffer unit, and data buffer unit is submitted to data set bag unit after the packet of receiving is ranked.
Data set bag unit parses the packet of issuing same purpose access point according to the purpose access point information in the packet header of each packet, and a plurality of parcels that send to same access point are formed a big bag.Packet after the reorganization increases a packet header, and this packet header comprises the purpose user device IP address that original packet will send.
Then, the big bag after the group packet server will be recombinated is sent to the access point that will send, and this packet is issued to the agent client module of all coupled subscriber equipment correspondences by access point.
Step 60, the agent client module receives the media data packet of sending from access point, by data set bag/unwrapper unit the packet that receives being carried out this locality according to the user equipment (UE) IP address information in the packet header unpacks, parse the packet of the subscriber equipment corresponding with it, abandon the media data packet that mails to other purposes user, data set bag/unwrapper unit packet by the agent client module is reduced into the form that subscriber equipment can receive, and it is passed to the purpose subscriber equipment.By this process as can be seen, the queuing of media data recombination method of the present invention and regrouping process are to be finished in above-mentioned steps 50 by the group packet server in the described multi-media transmission system.
Fig. 6 is the flow chart of media data recombination method of the present invention.
As shown in Figure 6, the detailed process of media data recombination method of the present invention is as follows:
Step 1, the group packet server receives packet, deposits data buffer unit in.
Data buffer unit is determined purpose access point with this address correlation according to the destination address information in the packet header of the packet in the data buffer zone, then, to the difference of these packets, the packet that mails to different access points is ranked respectively according to the access point that will send to.
The institutional framework of queuing back packet as shown in Figure 7.In Fig. 7, between the individual queue that mails to different access points, can rank according to the data volume of individual queue, also can rank according to the mode that other users set.The queuing principle of individual queue inside is preferentially to guarantee the real-time audio and video high priority data, promptly voice data priority is the highest when queuing, video data secondly, other data come Voice ﹠ Video data back, according to the characteristics of using, the user also can be provided with the priority of some specific type data (such as real-time game) in formation.The media data of same type in same formation is ranked according to the time order and function that arrives.
Step 2, a big packet is formed with a plurality of small data packets that will send to same access point in data set bag unit, make the packet after each reorganization only comprise the packet that mails to same access point, and adding a reorganization packet header, information such as the source address of different pieces of information bag and destination address, data load length, data type are described in this packet header.
Fig. 8 is a structure chart of organizing the packet behind the bag again, and as shown in Figure 8, A1, A2, B1, B2, B3, C1, C2, D1, D2, E1 are for issuing the packet of A, B, C, D, five purpose subscriber equipmenies of E simultaneously.A, B, C, D, five purpose subscriber equipmenies of E all are connected to same access point.Packet after the reorganization is Z, this packet comprises A1, A2, B1, B2, B3, C1, C2, D1, D2, E1 and reorganization packet header, and information such as the source address of A1, A2, B1, B2, B3, C1, C2, D1, D2, E1 and destination address, data load length, data type are described in this packet header.
After this packet of structure, data set bag unit can carry out encryption to this packet.
Step 3, the big packet after will recombinating in data set bag unit is sent to the access point that will send, and this packet is issued to the agent client module of all coupled subscriber equipment correspondences by access point.
Queuing strategy described in the step 1 also can be that all packets that send to same access point are ranked according to the sequencing that arrives.
In above-mentioned steps one, for the inner queue that mails to same access point, to rank according to the priority of packet medium type, the data that priority is high come the front of formation.Wherein, voice data has limit priority, and video data has higher priority, and general data has lowest priority.
Before above-mentioned steps two, may further include:
Whether quantity of data packets surpasses a certain set point T1 in the data buffer unit judgment data buffering area, if surpass this set point T1, then the priority according to data abandons unessential media data packet.Behind data packet discarding, (T2＜T1), the process of abandoning stops after the quantity of bag reaches a certain threshold value T2.
The principle that abandons is preferentially to abandon the media data packet that comes the rear end, after abandoning media data packet, guarantees the speech quality of whole wireless network as far as possible.
When abandoning, in order to reach effect preferably, can judge the type and the content of data in the packet, abandon process by the type and the content of data.As shown in Figure 9, concrete workflow is as follows:
Whether S1 comprises general data in the judgment data bag, if comprise general data in the packet, then abandon general data, and judges whether the packet size abandon after the general data meets the demands, if satisfy, the process that then abandons is finished.
If the packet size after not comprising general data in the packet or abandoning general data is backlog demand still, then carry out the judgement of S2.
Whether S2 comprises video data in the judgment data bag, for the judgement of video data type, can carry out according to the field information of expression data type in the data packet head of using.Generally speaking, the corresponding primary image I of the data type field of base image data frame, the corresponding error image B of the data type field of non-base image data, P frame.If comprise video data, then check the video packets type, abandon non-base image packet, and whether judgment data bag size meet the demands, if meet the demands, the process of abandoning is finished; If do not meet the demands, then begin to abandon the base image packet, and whether judgment data bag size meets the demands; If meet the demands, the process of abandoning is finished; If do not meet the demands, then re-execute the process of S2.
If do not comprise video data in the packet, then check the VoP type.Generally speaking, can detect the type of speech data according to the field of expression data type in the speech data packet header; And, also can directly detect speech data for waveform coding voice data (adopting modes such as G711, G726 to encode), whether determination data bag type is quiet data.After detecting the voice packet type, abandon the quiet data bag, and whether judgment data bag size meets the demands; If meet the demands, the process of abandoning is finished; If do not meet the demands, then abandon the vocoded data bag that carries repair mechanism, and whether judgment data bag size meets the demands; If meet the demands, abandon and finish; If do not meet the demands, then begin to abandon the oldest VoP, the process of abandoning is finished.
In above-mentioned steps two, preferentially begin to package from the media data packet that comes queue front.In order to reduce the loss of data that excessive data packet transmission conflict causes, the whole packet size after the reorganization should be long less than the maximum bag of the link layer of upper strata tolerance.
In addition, when in step 2, packaging, can carry out packet header compression processing with mailing to a plurality of continuous bags of same destination address, to improve clean He ratio.
Media data recombination method of the present invention has adopted the group packet server that the media data that different access points send is adopted the strategy of organizing into groups again and sending.This strategy can send the media data of a plurality of terminals under the same access point in the process that once sends, effectively promote bandwidth availability ratio and downlink efficiency of media data.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (15)
1. media data recombination method may further comprise the steps:
Steps A is ranked to the packet of receiving;
Step B, the packet that will send to same access point is recombinated.
2. the method for claim 1 is characterized in that, described steps A is ranked the packet that mails to different access points respectively to the packet the received difference according to the access point that will send to.
3. the method for claim 1 is characterized in that, described steps A is ranked according to the sequencing that arrives to the packet that will receive.
4. method as claimed in claim 2, it is characterized in that, in the described steps A, between the individual queue that mails to different access points, data volume according to individual queue is ranked, for the inner queue that mails to same access point, rank according to the priority of packet medium type, and the media data packet of same type is ranked according to the time order and function that arrives.
5. the method for claim 1, it is characterized in that, described step B adds a reorganization packet header to the packet after recombinating, and source address and destination address, data load length and the data type of the different media data packet that mail to same access point described in this packet header.
6. as claim 1 or 5 described methods, it is characterized in that, when packet is recombinated, a plurality of continuous packets are carried out the packet header compression among the described step B.
7. as claim 1 or 5 described methods, it is characterized in that, after the packet reorganization, packet is carried out encryption among the described step B.
8. as claim 1 or 5 or 6 or 7 described methods, it is characterized in that the size of the packet in described step B after the reorganization is long less than the maximum bag of link layer.
9. the method for claim 1 is characterized in that, before the described step B, further may further comprise the steps:
Whether the data volume in the judgment data buffering area surpasses a certain set point, if surpass this set point, then abandons the lower media data packet of importance.
10. method as claimed in claim 9 is characterized in that, abandons by the type and the content of packet.
11. a group packet server is used for packet is recombinated, and it is characterized in that, comprising:
Data buffer unit is used for the packet that receives is ranked, and the data packet queue after will lining up sends to data set bag unit;
Data set bag unit is used for the data packet queue after the queuing is recombinated.
12. as claimed in claim 11 group of packet server, it is characterized in that, described data buffer unit is between the individual queue that mails to different access points, data volume according to individual queue is ranked, for the inner queue that mails to same access point, priority according to the packet medium type is ranked, and the media data packet of same type is ranked according to the time order and function that arrives.
13. as claimed in claim 11 group of packet server is characterized in that, described data set bag unit will send to the packet of same access point and recombinate.
14. as claimed in claim 11 group of packet server is characterized in that, described data buffer unit abandons by the type and the content of packet.
15. as claimed in claim 11 group of packet server is characterized in that, further comprises registering unit, authentication unit and network condition memory cell, wherein,
Registering unit is used to receive register requirement, and log-on message is saved in the network condition memory cell;
Authentication unit is used for behind the packet that receives from subscriber equipment, judges according to the log-on message of preserving in the network condition memory cell whether described subscriber equipment has been registered to the group packet server.
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| CN104348656A (en) * | 2013-08-07 | 2015-02-11 | 中国移动通信集团北京有限公司 | Data acquisition method and device |
| CN103814582B (en) * | 2013-11-05 | 2017-06-20 | 华为技术有限公司 | Video service data transmission and data sending device |
| CN103814582A (en) * | 2013-11-05 | 2014-05-21 | 华为技术有限公司 | Data transmission method, data receiving device and data sending device for video service |
| CN106330820A (en) * | 2015-06-18 | 2017-01-11 | 上海交通大学 | Packet header design method based on MMT (MPEG media transport) protocol transmission and recombination non-sequential media |
| CN107332860A (en) * | 2017-08-10 | 2017-11-07 | 上海梁维贸易有限公司 | A kind of data transmission method and storage medium |
| CN107332860B (en) * | 2017-08-10 | 2020-08-28 | 上海梁维贸易有限公司 | Data transmission method and storage medium |
| CN107832356A (en) * | 2017-10-23 | 2018-03-23 | 成都佳发安泰科技股份有限公司 | A kind of data file system, generation and the method for showing test question files |
| CN109361951A (en) * | 2018-10-30 | 2019-02-19 | 腾讯科技（深圳）有限公司 | A kind of video data caching method, device and user terminal |
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