CN101834799B - Selection method of server of mobile IPTV (Internet Protocol Television), client, server and system - Google Patents
Selection method of server of mobile IPTV (Internet Protocol Television), client, server and system Download PDFInfo
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Abstract
The invention relates to a selection method of a server of mobile IPTV (Internet Protocol Television), a client, a server and a system. The method comprises the following steps of: sending an IPTV service request; receiving a media server list sent by a proxy server according to the IPTV service request, wherein the media server list includes a default media server; establishing the connection of the media server list and the default media server according to the media server list; sending a server quality probe data packet to each media server in the media server list; receiving a probe data packet returned by each media server, calculating and comparing the service quality parameter of each media server, and selecting the media server according to a selection strategy of the media server. According to the technical scheme provided by the invention, an optimal media server can be rapidly found and switched to meet the QoS requirement when a position of a mobile terminal is changed so as to avoid the degradation of the service quality.
Description
Technical field
The present invention is server selection method, client, server and the system about a kind of mobile network's television IPTV relevant for mobile communication technology concretely.
Background technology
In the IPTV network; For reducing access to netwoks and Signalling exchange time delay; Contradiction between solution backbone bandwidth resource-constrained and the numerous bandwidth demands that bring of concurrent user are too high; Improve user experience quality (QoE), the IPTV business platform uses CDN network (content distributing network: Content Delivery Network) accomplish distribution, transmission and the storage of looking audio content.IPTV CDN network is made up of a series of media servers, and media content adopts the mode of distributed storage to be stored on each media server.Therefore, when terminal request IPTV serves, need select certain optimal service device on the CDN network to the terminal transmission Media Stream for the terminal.In fixed network IPTV business, the optimal service device selects generally to be based on customer location.But in mobile IPTV business; The position of portable terminal is constantly to change; Wireless channel is also complicated more than fixed network access waies such as LAN, ADSL; Because the variation of mobile terminal locations causes the continuous variation of wireless channel parameter, make to guarantee that for portable terminal distributes fixing this mode of media server the user is to the professional experience of IPTV like this.Therefore; Need badly in the industry based on the server selection method, client and the system that move IPTV; Can the real-time detection client and the dynamic change of each server-link state of CDN network (packet loss, time delay etc.); Selection to user's transmitting media content, reduces media delivery time delay and transmission impairment to the optimum server of user, improves service quality.
Summary of the invention
On the one hand, the present invention proposes a kind of based on the server selection method that moves IPTV, to solve the problem how in moving IPTV, to select server that prior art exists.Said server selection method based on mobile IPTV comprises:
Send the IPTV services request;
Receive the media server tabulation that acting server sends according to described IPTV services request, comprise the acquiescence media server in the described media server tabulation;
According to the tabulation of said media server, set up with described acquiescence media server between be connected;
Each media server in the media server tabulation sends quality probe data packet;
Receive the probe data packet that each media server returns, the QoS parameter of calculating and more described each media server is selected media server according to the media server selection strategy.
On the other hand, the present invention proposes a kind of based on the client that moves IPTV, and described client comprises:
IPTV services request transmitting element is used to send the IPTV services request;
Media server tabulation receiving element is used to receive the media server tabulation that acting server sends according to described IPTV services request, comprises the acquiescence media server in the described media server tabulation;
Media server connects sets up the unit, is used for according to said media server tabulation, set up with described acquiescence media server between be connected;
The service quality probe unit is used for sending the service quality probe requests thereby to each media server of media server tabulation;
The media server selected cell is used to receive the probe data packet that each media server returns, and the QoS parameter of calculating and more described each media server is selected media server according to the media server selection strategy.
Another aspect, the present invention also proposes based on the acting server that moves IPTV, and described acting server comprises:
IPTV services request receiving element is used to receive the IPTV services request;
Media server tabulation transmitting element is used for according to described IPTV services request, sends the media server tabulation.
Again on the one hand, the present invention also proposes a kind of based on the system that moves IPTV, and described system comprises: based on the client that moves IPTV with based on the acting server that moves IPTV; Wherein:
Described client comprises: IPTV services request transmitting element is used to send the IPTV services request; Media server tabulation receiving element is used to receive the media server tabulation that acting server sends according to described IPTV services request, comprises the acquiescence media server in the described media server tabulation; Media server connects sets up the unit, is used for according to said media server tabulation, set up with described acquiescence media server between be connected; The service quality probe unit is used for sending the service quality probe requests thereby to each media server of media server tabulation; The media server selected cell is used to receive the probe data packet that each media server returns, and the QoS parameter of calculating and more described each media server is selected media server according to the media server selection strategy; Described acting server comprises: IPTV services request receiving element is used to receive the IPTV services request; Media server tabulation transmitting element is used for according to described IPTV services request, sends the media server tabulation.
Beneficial effect of the present invention is, according to technical scheme provided by the invention, can find rapidly and switch to when portable terminal is changed in the position and satisfy the server that QoS (service quality) requires, and avoids the decline of service quality.From the availability angle, this programme can also be simplified handoff procedure simultaneously, avoids frequent retrieval server, reduces the resource loss of system, makes being applied on the portable terminal that system can success.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the 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 property, can also obtain other accompanying drawing according to these accompanying drawings.
The sketch map that provides for the embodiment of the invention shown in Figure 1 based on the running environment of the system that moves IPTV;
The flow chart that provides for the embodiment of the invention shown in Figure 2 based on the method that moves IPTV;
Shown in Figure 3 for the embodiment of the invention provide based on the client terminal structure sketch map that moves IPTV;
Shown in Figure 4 for the embodiment of the invention provide based on another structural representation of client that moves IPTV;
Shown in Figure 5 for the embodiment of the invention provide based on the server architecture sketch map that moves IPTV;
Shown in Figure 6 for the embodiment of the invention provide based on the system configuration sketch map that moves IPTV;
The user quality that provides for the embodiment of the invention shown in Figure 7 experience and QoS parameter between the sketch map of corresponding relation;
Detect cycle that provides for the embodiment of the invention shown in Figure 8 and detection time be sketch map at interval;
The server list that provides for the embodiment of the invention shown in Figure 9 is upgraded sketch map.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, 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 are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Sketch map based on the running environment of the system that moves IPTV as shown in Figure 1, as to provide for the embodiment of the invention.In the application scenarios of the mobile IPTV shown in Fig. 1; The system that is made up of equipment such as acting server, a plurality of media server (the acquiescence media server A shown in the figure, media server B, media server C, media server D), router, base stations provides IPTV business platform; Through this IPTV business platform is that the terminal provides IPTV service; To guarantee the user experience quality of client (specifically can be portable terminal, mobile phone A, the mobile phone B shown in for example scheming) when under mobile status, using streaming media service.In the network that a plurality of clients, a plurality of media servers are arranged, each client (for example: mobile phone) but the qos parameter of link between each server on this client of real-time detection and the CDN network.According to qos parameter and the corresponding server selection strategy surveyed, choose the current streaming media server that should connect, and realize the Streaming Media transmission.If when judging that according to result of detection current server can't satisfy the service quality minimum requirements; Client can be initiated to survey to other servers in the server list in order; Calculate the QoS parameter of each media server; And select to satisfy the server of quality of service requirement, replace current server as next server.When carrying out the server switching, native system can be realized the breakpoint transmission function automatically.
Flow chart based on the method that moves IPTV as shown in Figure 2, as to provide for the embodiment of the invention.
Step S201, client is sent the IPTV services request to acting server;
Said client includes but not limited to mobile phone, PDA and PC.
Step S202 receives the media server tabulation that acting server sends according to described IPTV services request, comprises the acquiescence media server in the described media server tabulation;
Further, described reception acting server comprises according to the media server tabulation of described IPTV services request transmission: receive acting server according to the media server tabulation of described IPTV services request through the transmission of transmission control protocol.Described tabulation comprises a default server can provide the server of Media Stream with other.Particularly, described server list can be the address list of each media server.Acquiescence media server in the service list can be that acting server chooses from a plurality of media servers according to predefined selection strategy; For example: acting server can select the optimum media server of a current service mass parameter as the acquiescence media server according to the QoS parameter of current a plurality of media servers, and the starting stage professional at client-requested IPTV provides Media Stream to client.But the present invention is not limited to this; The person of ordinary skill in the field can be according to the technological know-how of being grasped; Utilize another selection strategy to select a media server, all should be included within protection scope of the present invention according to common variation and the replacement that this programme carried out as the acquiescence media server.
Step S203, according to the tabulation of said media server, set up with described acquiescence media server between be connected;
Further, set up with described acquiescence media server between be connected after, receive the Media Stream that described media server sends and play described Media Stream;
Step S204, each media server in the media server tabulation sends quality probe data packet, to obtain the QoS parameter of current each media server; Preferential is to survey to media server through sending the service quality detection packet according to preset detect cycle.
Step S205 receives the probe data packet that each media server returns, and the QoS parameter of calculating and more described each media server is selected media server according to the media server selection strategy.
Further, receive the probe data packet that each media server returns, the QoS parameter of calculating and more described each media server, select media server to comprise according to the media server selection strategy:
Preset QoS parameter upper limit threshold, lower threshold;
If the QoS parameter of described acquiescence media server is less than described service quality lower threshold, then with described acquiescence media server as current server, and said preset detect cycle prolonged;
If the QoS parameter of described acquiescence media server is greater than described service quality lower threshold; When the QoS parameter of a media server that detects during less than described service quality lower threshold; Then said media server is elected to be and is current server, and said preset detect cycle is shortened; If the QoS parameter of all media servers that detect is all between between the upper limit threshold of described service quality, lower threshold the time; Then the QoS parameter with all media servers sorts; The media server that QoS parameter is minimum (being the optimum media server of service quality) is elected to be and is current server, and said preset detect cycle is shortened.
If the QoS parameter of all media servers is all greater than described service quality upper limit threshold, then current IP TV service is unavailable.
Thus; When having realized that the current media server can't satisfy the service quality minimum requirements; Client is initiated to survey to other servers in the server list in order, and selects can satisfy the server of quality of service requirement, reselects media server to be implemented in to move under the IPTV environment.
As shown in Figure 3, for the embodiment of the invention provide based on the client terminal structure sketch map that moves IPTV.Described client 300 based on mobile IPTV comprises: IPTV services request transmitting element 301, media server tabulation receiving element 302, media server connect sets up unit 303, service quality probe unit 304 and media server selected cell 305.Wherein:
IPTV services request transmitting element 301 sends the IPTV services request;
Media server tabulation receiving element 302 is used to receive the media server tabulation that acting server sends according to described IPTV services request, comprises the acquiescence media server in the described media server tabulation;
Described media server tabulation receiving element 302 is further used for receiving the media server tabulation that acting server sends through transmitting control protocol according to described IPTV services request.
Media server connects sets up unit 303, is used for according to said media server tabulation, set up with described acquiescence media server between be connected;
Service quality probe unit 304 is used for sending quality probe data packet to each media server of media server tabulation;
Said service quality probe unit 304 is further used for according to preset detect cycle, surveys to media server through sending the service quality detection packet.
Media server selected cell 305 is used to receive the probe data packet that each media server returns, and the QoS parameter of calculating and more described each media server is selected media server according to the media server selection strategy.
Described media server selected cell 305 is further used for: preset QoS parameter upper limit threshold, lower threshold; If the QoS parameter of described acquiescence media server is less than described service quality lower threshold, then with described acquiescence media server as current server, and said preset detect cycle prolonged; If the QoS parameter of described acquiescence media server is greater than described service quality lower threshold; When the QoS parameter of a media server that detects during, then said media server is elected to be and is current server less than described service quality lower threshold; If the QoS parameter of all media servers that detect is all between between the upper limit threshold of described service quality, lower threshold the time; Then the QoS parameter with all media servers sorts, and the media server that QoS parameter is minimum (being the optimum media server of service quality) is elected to be and is current server; If the QoS parameter of all media servers is all greater than described service quality upper limit threshold, then current IP TV service is unavailable.
Shown in Figure 4 for the embodiment of the invention provide based on another structural representation of client that moves IPTV; Described client 300 based on mobile IPTV further comprises: Media Stream receives and broadcast unit 306; Be used for when described media server connect set up unit 303 and connect with media server after, receive the Media Stream that described media server sends and play described Media Stream.
Preferably, carry out qos parameter and survey, mainly comprise the detection of delay detection and packet loss.Wherein: the QoS detection packet can be used the character string of length as 64byte; Detection packet number, detection packet to each server sends are sent at interval and can be adjusted according to network condition, and for example: the detection packet number is set to 300, and giving out a contract for a project is set to 3 milliseconds.The QoS detection packet can be used the UDP encapsulation.Through the qos parameter in more different paths (path between client and each media server), choose optimized media server, and whether decision needs server to switch.After when server switches, accomplishing, client receives the Media Stream that is provided by new media server.In addition, client also can be added up Media Stream and received progress msg, has promptly received byte number, and to acting server report reception progress.Report adopts the TCP transmission to guarantee reliability.By way of example, be the time delay set in the IPTV business and the lower threshold of packet loss shown in the table 1; Be the time delay set in the IPTV business and the upper limit threshold of packet loss shown in the table 2.
Time delay and packet loss upper limit threshold in the table 1:IPTV business
Time delay and packet loss upper limit threshold in the table 2:IPTV business
In a detect cycle, the detection to current server can be at first initiated at the terminal.Be increase system efficiency, if the QoS parameter of current server is lower than lower threshold as described in Table 1, the service quality that then need not continue to carry out other server-link is surveyed; Be lower than lower threshold if in detection process, record the QoS parameter of certain server, then this server is next optimal service device, and finishes this detect cycle; If the QoS parameter of the Servers-all that detects is all between between the upper limit threshold of described service quality, lower threshold the time; Then the QoS parameter with Servers-all sorts, and the media server that QoS parameter is minimum is elected to be and is current server; If the Servers-all link parameter that records in detect cycle all is higher than upper limit threshold as described in Table 2, will cause professional unacceptablely, think that current IP TV business is unavailable this moment.
As shown in Figure 5, for the embodiment of the invention provide based on the server architecture sketch map that moves IPTV.Described acting server 500 based on mobile IPTV comprises: IPTV services request receiving element 501 and media server tabulation transmitting element 502.Wherein: IPTV services request receiving element 501 is used to receive the IPTV services request; Media server tabulation transmitting element 502 is used for according to described IPTV services request, sends the media server tabulation.
As shown in Figure 6, for the embodiment of the invention provide based on the system configuration sketch map that moves IPTV.Described system comprises based on the client 300 that moves IPTV with based on the acting server 500 that moves IPTV.Wherein: send the IPTV services request based on the client 300 that moves IPTV to sending acting server 500, after acting server 500 is received this request, send the media server tabulation.Client 300 is surveyed after receiving this media server tabulation, and optimal media server is reselected in final realization.Preferably, adopt the socket interface to communicate between acting server 500, media server and the client 300.
As shown in Figure 7, the user quality that provides for the embodiment of the invention experience and QoS parameter between the sketch map of corresponding relation.Native system is guaranteeing to move under the IPTV scene streaming media service QoE of client in moving process.Can know according to test data: when QoE drops to certain reference value when following, the quality of service that the user perceives is unacceptable; And being optimized to certain reference value when above as QoE, the user just can not continue to perceive tangible quality of service and promote.Therefore, consider from the comprehensive angle of systematic function and validity, the user QoE upper and lower bound that initialization system should provide, promptly the QoE threshold value is used for the foundation that server is selected; There is nonlinear correspondence relation between QoE and the qos parameter, as shown in Figure 7.Therefore, the QoE threshold value of system requirements can be converted into the qos parameter threshold value of network layer; To sum up, when QoS reached lower limit (the A point among the figure), system can guarantee to provide customer satisfaction system QoE, and at this moment, even continue to optimize QoS, the QoE that the user perceives also no longer includes obvious lifting; And when QoS deteriorated into higher limit (the B point among Fig. 7), the QoE that system provides was unacceptable.Therefore, native system should confirm to influence main qos parameter and the corresponding threshold value of the QoE of system, as the foundation of server selection.
Detect cycle that provides for the embodiment of the invention shown in Figure 8 and detection time be sketch map at interval.T
N+1Be two detect cycle P
nAnd P
N+1Between the time interval; P
nAnd P
N+1Be detect cycle; Be located at detect cycle P
nThe server of selecting afterwards is S
n, P
N+1The server of selecting behind the detect cycle is S
N+1If still be server S through the server of reselecting after surveying so
n, can probe interval be prolonged, for example: T
N+1=2T
nOtherwise, then can probe interval be shortened, for example: T
N+1=0.5T
nBut the present invention, can regulate according to different needs in practical application not as limit.
The server list that provides for the embodiment of the invention shown in Figure 9 is upgraded sketch map.T among the figure
nBe two detect cycle P
nAnd P
N+1Between the time interval.S
1To S
4Be a plurality of media servers.For elevator system is carried out efficient; Reduce the time and the processing expenditure of client executing detection process; After each detect cycle finishes; System will upgrade the sequence server in the server list and adjust, and is placed on first position in the server list to current server, explains in conjunction with Fig. 8: detect cycle P
nIn, client is at first to current server S
1Initiate to survey, obtain current server S
1The link quality of service parameter is through comparing S
1Service quality is higher than lower threshold.So initiate detection to other servers according to the current server tabulation; Through surveying and comparing S
3It is the optimal service device; The tabulation of update service device is with S
3Be placed on first position of tabulation; According to result of detection to server queuing (the optimal service device made number one puts, the suboptimum server is come the second place, and the like; The server that service quality is the poorest comes the position at end), and the order of server in the adjustment tabulation; Detect cycle P
N+1In, survey according to the server list after upgrading.
Thus; When having realized that the current media server can't satisfy the service quality minimum requirements; Client is initiated to survey to other servers in the server list in order; And select to satisfy the server of quality of service requirement, reselect optimal media server to be implemented in to move under the IPTV environment.
Above embodiment is the preferred embodiments of the disclosure, and is not in order to restriction the present invention, and common variation that those skilled in the art carries out in technical scheme of the present invention and replacement all should be included within protection scope of the present invention.
Claims (8)
1. the server selection method based on mobile network's television IPTV is characterized in that, described method comprises:
Send the IPTV services request;
Receive the media server tabulation that acting server sends according to described IPTV services request, comprise the acquiescence media server in the described media server tabulation;
According to the tabulation of said media server, set up with described acquiescence media server between be connected;
Each media server in the media server tabulation sends quality probe data packet;
Receive the probe data packet that each media server returns, the QoS parameter of calculating and more described each media server is selected media server according to the media server selection strategy;
Wherein, described each media server in the media server tabulation sends quality probe data packet and comprises: according to preset detect cycle, survey to media server through sending quality probe data packet;
The probe data packet that each media server of described reception returns, the QoS parameter of calculating and more described each media server, select media server to comprise according to the media server selection strategy:
Preset QoS parameter upper limit threshold, lower threshold;
If the QoS parameter of described acquiescence media server is less than described service quality lower threshold, then with described acquiescence media server as current server, and said preset detect cycle prolonged;
If the QoS parameter of described acquiescence media server is greater than described service quality lower threshold; When the QoS parameter of a media server that detects during, then said media server is elected to be and is current server less than described service quality lower threshold; If the QoS parameter of all media servers that detect is all between between the upper limit threshold of described service quality, lower threshold the time; Then the QoS parameter with all media servers sorts, and the media server that QoS parameter is minimum is elected to be and is current server;
If the QoS parameter of all media servers is all greater than described service quality upper limit threshold, then current IP TV service is unavailable.
2. the described method of claim 1 is characterized in that, described method also comprises: after connecting with media server, receive the Media Stream that described media server sends and play described Media Stream.
3. the described method of claim 1; It is characterized in that the media server tabulation that described reception acting server sends according to described IPTV services request comprises: receive the media server tabulation that acting server sends through transmitting control protocol according to described IPTV services request.
4. the client based on mobile network's television IPTV is characterized in that, described client comprises:
IPTV services request transmitting element is used to send the IPTV services request;
Media server tabulation receiving element is used to receive the media server tabulation that acting server sends according to described IPTV services request, comprises the acquiescence media server in the described media server tabulation;
Media server connects sets up the unit, is used for according to said media server tabulation, set up with described acquiescence media server between be connected;
The service quality probe unit is used for sending quality probe data packet to each media server of media server tabulation;
The media server selected cell is used to receive the probe data packet that each media server returns, and the QoS parameter of calculating and more described each media server is selected media server according to the media server selection strategy;
Wherein, described media server selected cell is further used for:
Preset QoS parameter upper limit threshold, lower threshold;
If the QoS parameter of described acquiescence media server is less than described service quality lower threshold, then with described acquiescence media server as current server, and said preset detect cycle prolonged;
If the QoS parameter of described acquiescence media server is greater than described service quality lower threshold; When the QoS parameter of a media server that detects during less than described service quality lower threshold; Then said media server is elected to be and is current server, and said preset detect cycle is shortened; If the QoS parameter of all media servers that detect is all between between the upper limit threshold of described service quality, lower threshold the time; Then the QoS parameter with all media servers sorts; The media server that QoS parameter is minimum is elected to be and is current server, and said preset detect cycle is shortened;
If the QoS parameter of all media servers is all greater than described service quality upper limit threshold, then current IP TV service is unavailable.
5. client as claimed in claim 4 is characterized in that, described client also comprises:
Media Stream receives and broadcast unit, is used for after described media server connection is set up unit and media server and connected, and receives the Media Stream that described media server sends and plays described Media Stream.
6. client as claimed in claim 4 is characterized in that, described media server tabulation receiving element is further used for receiving the media server tabulation that acting server sends through transmitting control protocol according to described IPTV services request.
7. client as claimed in claim 4 is characterized in that, said service quality probe unit is further used for according to preset detect cycle, surveys to media server through sending quality probe data packet.
8. the system based on mobile network's television IPTV is characterized in that, described system comprises: based on the client that moves IPTV with based on the acting server that moves IPTV; Wherein:
Described client comprises: IPTV services request transmitting element is used to send the IPTV services request; Media server tabulation receiving element is used to receive the media server tabulation that acting server sends according to described IPTV services request, comprises the acquiescence media server in the described media server tabulation; Media server connects sets up the unit, is used for according to said media server tabulation, set up with described acquiescence media server between be connected; The service quality probe unit is used for sending the service quality probe requests thereby to each media server of media server tabulation; The media server selected cell is used to receive the probe data packet that each media server returns, and the QoS parameter of calculating and more described each media server is selected media server according to the media server selection strategy;
Described acting server comprises: PTV services request receiving element is used to receive the IPTV services request; Media server tabulation transmitting element is used for according to described IPTV services request, sends the media server tabulation;
Wherein, described media server selected cell is further used for:
Preset QoS parameter upper limit threshold, lower threshold;
If the QoS parameter of described acquiescence media server is less than described service quality lower threshold, then with described acquiescence media server as current server, and said preset detect cycle prolonged;
If the QoS parameter of described acquiescence media server is greater than described service quality lower threshold; When the QoS parameter of a media server that detects during less than described service quality lower threshold; Then said media server is elected to be and is current server, and said preset detect cycle is shortened; If the QoS parameter of all media servers that detect is all between between the upper limit threshold of described service quality, lower threshold the time; Then the QoS parameter with all media servers sorts; The media server that QoS parameter is minimum is elected to be and is current server, and said preset detect cycle is shortened;
If the QoS parameter of all media servers is all greater than described service quality upper limit threshold, then current IP TV service is unavailable.
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| CN2010101708368A CN101834799B (en) | 2010-05-06 | 2010-05-06 | Selection method of server of mobile IPTV (Internet Protocol Television), client, server and system |
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| CN2010101708368A CN101834799B (en) | 2010-05-06 | 2010-05-06 | Selection method of server of mobile IPTV (Internet Protocol Television), client, server and system |
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| CN104518985A (en) * | 2013-09-27 | 2015-04-15 | 国家广播电影电视总局广播科学研究院 | Method and terminal for selecting service node in distributed network environment |
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