WO2010127618A1

WO2010127618A1 - System and method for implementing streaming media content service

Info

Publication number: WO2010127618A1
Application number: PCT/CN2010/072455
Authority: WO
Inventors: 周扬
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-05-07
Filing date: 2010-05-05
Publication date: 2010-11-11
Also published as: CN101557423A

Abstract

A system and method for implementing streaming media content service are provided. The system includes: at least one physical network management domain. The physical network management domains are connected with each other by communication network. A physical network management domain includes: at least one edge media server, which is set as: memorizing media content and providing media service for a client, wherein the edge media servers are connected with each other in its physical network management domain in a peer-to-peer (P2P) network topology manner; a domain list server, which is set as: memorizing media content information saved by each edge media server in its physical network management domain and providing media inquiry service for an edge media server, wherein the domain list servers of the physical network management domain are connected with each other in the system in the network topology manner. The present invention can improve the media capacity and user scale expandability and reduce the bandwidth of the central nodes and the effect of the single point invalidity on the whole system.

Description

System and method for implementing streaming media content service

TECHNICAL FIELD The present invention relates to a system and method for distributed streaming media content services, which provides various streaming media content services including live broadcast, on-demand, carousel, download, etc. for clients such as computers, media consoles, and video phones.

Background technique

In recent years, streaming media content services are in a stage of rapid development, with storage capacity reaching hundreds of T bytes, even thousands of T bytes, and the scale of users has expanded from tens of thousands to millions to tens of millions. Although the traditional CDN (Content Delivery Network) technology can accelerate the distribution of streaming media to a certain extent, realizing live, on-demand, carousel, download and other services, but its core is still ^ centralized server structure, mainly exist The following questions:

(1) When the media content increases, the capacity of each node needs to be increased accordingly, and the media capacity can be poorly extended;

(2) When the number of users increases, the CPU processing power, read/write capability, etc. of each node need to be synchronized and enhanced, and the scalability of the user scale is poor;

(3) The central node network consumes a large amount of bandwidth, and the reliability caused by a single point of failure is poor. Due to the above problems of the traditional CDN technology, it is unable to meet the current large-scale video content and user needs.

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a system and method for implementing streaming media content services, improving media capacity and user scale scalability, reducing network bandwidth consumption of a central node as much as possible, and reducing single point failure to the entire network. influences. In order to solve the above technical problem, the present invention provides a system for implementing a streaming media content service, including: at least one physical network management domain, each physical network management domain being connected through a communication network; The physical network management domain includes: at least one edge media server, configured to: store the media content, and provide the media service to the client, where the edge media servers are connected in a peer network topology in the physical network management domain; And a domain directory server, configured to: store media content information saved by each edge media server of the physical network management domain, and provide media query service for the edge media server; the domain directory server of each physical network management domain is in the system The connection of the topology. Preferably, the domain directory server is further configured to: store media content information in a domain directory server of another physical network management domain, and provide a cross-domain media query service for the edge media server in the physical network management domain. Preferably, each edge media server in the physical network management domain is fully distributed, and the centralized secondary mode is used. The intra-domain edge media server provides a media query service to other edge media servers by means of a distributed hash table. Preferably, the physical network management domain further includes: a media publishing unit, configured to: receive a media publishing request of the domain directory server in the domain, and release media program information in the domain. In order to solve the above technical problem, the present invention provides a method for implementing a streaming media content service, which includes the following processes: an edge media server receives a media content search request of a client of a user area; and searches for an edge media stored with the target media content in the domain. Server; redirects the client to an edge media server that holds the target media content. Preferably, after the edge media server storing the target media content is searched, before the client is redirected, the method further includes the following processes: detecting a quality of service parameter of each edge media server storing the target media content, and selecting a service The edge media server with high quality parameters acts as the client redirect target server. Preferably, the process of searching for the edge media server in the domain includes: searching, by using a distributed hash table, whether other edge media servers are stored in the domain. The standard media content, if the edge media server containing the target media content is not found within the specified service quality requirement, finds the edge media server storing the target media content to the domain directory server in the domain.

Preferably, the method further includes the following process: the cross-domain domain directory servers exchange media content information by one of: a multicast, a distributed hash table, and a centralized mode. Preferably, in the process of searching for the edge media server storing the target media content in the domain, if the edge media server storing the target media content is not found, the method further includes the following process: searching for a cross-domain storage target The processing of the edge media server for media content. Preferably, the process of searching for the edge media server storing the target media content across the domain comprises: searching the domain directory server of the physical network management domain storing the target media content across the domain by the domain directory server in the domain; The directory server looks for an edge media server that stores the target media content.

The system and method for implementing the streaming media content service proposed by the present invention, on the one hand, the edge media server in the physical network management domain is connected by a P2P (Peer-to-Peer, peer-to-peer) network topology, in particular, The distributed structured topology solves the problem of poor media capacity and user scale scalability of the CDN system, reducing the bandwidth of the central node and the impact of single point failure on other nodes in the system; on the other hand, setting a centralized directory server , to ensure the node find time, to ensure the quality of service. Moreover, DTS (Domain Track Server Domain Directory Server) constitutes a long-term Ι ⁄ ⁄ 0 0 查找查找查找查找查找查找查找查找查找查找查找查找查找查找查找查找查找查找

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system architecture diagram of an embodiment of a streaming media content service system according to the present invention; FIG. 2 is a flowchart of processing for searching and requesting media content in an embodiment of a method for implementing a streaming media content service according to the present invention;

3 is a realization of the flow of the present invention flg ^-rr ^, ί- ^ ii; ttr 4f withdrawal too AA 1, -: S Cheng Tu.

BEST MODE FOR CARRYING OUT THE INVENTION The implementation process of the system and method for implementing streaming media content service of the present invention will be described in detail below with reference to the accompanying drawings. The core idea of the system for implementing streaming media content service of the present invention is to integrate P2P technology and CDN technology. In the embodiment shown in FIG. 1 , the system includes multiple physical network management domains D1 and D2 Dn, and each physical network management domain may be deployed in a province, a city, a district, or a county according to actual conditions. Build a network topology between CDN EMS (Edge Media Server) in the same physical network management domain. In one embodiment, the network topology can be selected mainly by using a fully distributed structured topology and a centralized mode. For example, D DHT (Distributed Hash Table) is used to build network topology and provide media query services for other edge media servers. The client performs the search and request processing of the media content by triggering the edge media server EMS to which it belongs. The media content of the content source is injected into the edge media server of each physical network management domain. A DTS (Domain Track Server) is also provided in each physical network management domain to store media content information held by all EMSs in the physical network management domain, and to provide media query services for the edge media servers. The domain directory servers of each management domain are connected in a network topology within the system. In an embodiment, the domain directory server may also store media content information in the domain directory server of the other physical network management domain, and provide cross-domain media query service for the edge media server in the management domain. The cross-domain domain directory servers can exchange media content information by using one of: multicast, distributed hash table, and centralized mode. In an embodiment, the physical network management domain further includes: a media publishing unit, configured to receive a media publishing request of the domain directory server in the domain, and release the media program information in the domain. The media publishing unit may specifically be a web portal (Web Portal). The method for implementing the streaming media content service of the present invention sets the basic search process to the intra-domain lookup in the process of performing node search. In addition, you can increase the cross-domain lookup process. The essence of the discovery process is to find an edge media server that stores the target media content. The edge media server can be an edge media server in the domain or a cross-domain edge media server, and redirect the client to the target media content. Edge Media Server. In one embodiment, the intra-domain lookup includes: intra-domain lookup in DHT mode and intra-domain lookup done through DTS; cross-domain lookup is done through the DTS topology network. The following is a detailed description of the following: In this embodiment, each edge media server in the domain uses DHT to construct a network topology, and DHT is a main topology of a fully distributed structured topology P2P network, which is within a network scope. A hash table maintained by many nodes. The hash table is divided into discontinuous blocks, each node is assigned to a hash block of its own and becomes the manager of this hash block. By encrypting the hash function, the name or keyword of an object is mapped to a hash value of several bits. The DHT architecture has good scalability, robustness, uniformity of node ID assignment, and self-organization capabilities. Since the overlapping network uses a deterministic topology, DHT can provide accurate discovery. As long as the destination node exists in the network, DHT can always find it, and the accuracy of the discovery is guaranteed. The main DHT topology includes Pastry. Chord and CAN, etc. The biggest problem with the DHT architecture is that the network fluctuations (Churn) caused by the DHT's frequent join/exit of processing nodes can greatly increase the maintenance cost of the DHT. In the method for implementing the streaming media content service, the EMS is relatively stably present in the network in the P2P network topology formed by the edge media server EMS of the CDN, and a new one needs to be added unless a server failure or system expansion occurs. In the case of edge media servers, otherwise, nodes do not join and exit the system frequently, so DHT maintenance costs are small. At the same time, using the fully distributed structure of DHT, the scalability problem of the CDN system is solved, and the bandwidth of the central node and the influence of single point failure on other nodes in the system are reduced. In addition, a centralized domain directory server DTS is set in each physical network management domain, and the DTS stores media content information held by all EMSs in the physical network management domain. If the DHT search delay reaches a certain threshold and still cannot find the EMS that can provide the service, the DTS can quickly find the information of the EMS containing the media content in the physical network management domain according to the locally saved information, and Inform the EMS that initiated the media content lookup, thus ensuring the quality of the service. Since the DTS of each physical network management domain together constitutes a network topology, when a certain physical network When the management domain publishes new media content or saves a new media content to serve other physical network management domains, the DTS of the physical network management domain declares the network management and contains new in the form of multicast, DHT, and centralized. Media information, other DTSs in the network receive this information and save it locally. If the media content is newly released, the DTS of each physical network management domain may also publish the media content in the physical network management domain of the physical network through the Web Portal to serve the user. When there is no media content requested by the user in a certain physical network management domain, the application DTS is configured to have a small number of DTSs, and the network bandwidth between the DTSs of the respective network management domains is large, and the network bandwidth required for media content information transmission is occupied. Relatively small, therefore, each DTS saves all other DTS information and does not have a large impact on the overall system resource occupancy rate, and this way can greatly improve the search of media content between different network management domains. effectiveness. The basic applications of the streaming media content service method of the present invention include: searching for media content and publishing media content. The details will be described below by way of examples. The processing flow for searching and requesting media content in the embodiment of the method for implementing the streaming media content service of the present invention as shown in FIG. 2 includes the following processing steps: Step 201: If the media content required by the client cannot be found in the user area A, the trigger is triggered. The edge media server EMS belonging to the area A searches for media content in the media content, and the client finds the media content in the illustration to the EMS1. Step 202: The EMS to which the user area A belongs searches for the EMS containing the target media content to the other EMSs of the same physical network management domain by means of DHT, that is, the EMS 1 in the figure searches for the media information to the EMS2, EMS3, and EMS4. If the EMS containing the target media content is found within the specified quality of service requirements, then go to step 205; otherwise, continue to the next step. Step 203: The EMS to which the area A belongs to the DTS initiating the node search request of the same physical network management domain, that is, the EMS1 searches for the media information to the DTS1 in the figure, and if the DTS finds the EMS containing the target media content in the physical network management domain, the DTS continues. One step; otherwise, go to step 208. Step 204: The DTS returns the information of the EMS containing the target media content in the same physical network management domain to the EMS to which the area A belongs, that is, the DTS1 in the figure feeds back the EMS information to the EMS1. In this embodiment, the DTS1 feedback EMS3 and EMS4 contain the target. Media content. Step 205: The EMS to which the area A belongs sends a media content query to one or more EMSs of the same physical network management domain that contain the target media content, that is, the EMS1 sends the media content query to the EMS3 and EMS4. Step 206: The EMS that receives the media content query checks local program content, storage, network bandwidth, computing resources, and load conditions, and sends the information to the EMS to which the area A belongs, that is, the EMS3 and EMS4 in the figure feed back information to the EMS1. . Step 207: The EMS of the area A checks the network available bandwidth of the EMS containing the target media content in the same physical network management domain, the distance from the user, the load, etc., selects an EMS that can provide a better quality of service, and redirects the client to The EMS, in which EMS1 selects EMS3 and redirects the client to EMS3, the client can obtain the required media content through EMS3, and ends the process.

The one or more physical management domains containing the target media content are found, and the DTS information of the physical management domains is returned to the EMS to which the zone A belongs, that is, the DTS1 feedback information in the figure is sent to the EMS1. Step 209: The EMS to which the area A belongs sends a node lookup request to the DTS of the physical management domain containing the target media content, and searches for the EMS containing the target media content, that is, the EMS1 sends a lookup request to the DTS2 in the illustration. Step 210: The DTS of the physical network management domain that contains the target media content sends the EMS list to the EMS to which the area A belongs, that is, the DTS2 feedback information in the figure to the EMS1. In this embodiment, the DTS2 feedback EMS5 and EMS6 contain the target media content. Step 211: The EMS to which the area A belongs sends the media content query to one or more EMSs that have the target media content in the other physical network management domain, that is, the EMS1 sends the media content query to the EMS5 and EMS6 in the illustration. Step 212: Receive the program content, storage, network bandwidth, calculation, and other resources and loads of the EMS check by the media content, and send the situation to the EMS to which the area A belongs, that is, the EMS5 and EMS6 in the figure feed back the information to the EMS1. . Step 213: The EMS of the area A checks the network available bandwidth of the EMS containing the target media content in other physical network management domains, the distance from the user, the load, and the like, and the selection may be performed. For better quality of service EMS, and redirect the client to the EMS, ie EMS1 selects EMS5 and redirects the client to EMS5, the client can obtain the required media content through EMS5. Step 214: Each time the DTS directs the EMS of the physical network management domain to another physical network management domain, the DTS records the media content information requested by the EMS and counts the number of times each media content is requested, when a certain media content When the requested number reaches a certain threshold, the DTS finds one or more EMSs with better performance from the physical network management domain it contains, and the EMS actively requests the media in the physical network management domain where the media content is located. The content is stored in the physical network management domain, and the subsequent request for the media content only needs to be performed in the physical network management domain. Step 215: The DTS declares that the program is included in the physical network management domain in which the DTS is located in the multicast, DHT, and centralized manners, and the DTS of the other physical network management domain obtains the information and saves the information. As shown in FIG. 3, the processing flow for distributing a media program in the embodiment of the method for implementing the streaming media content service of the present invention specifically includes the following processing steps: Step 301: The management domain directory server DTS in the physical network management domain D1 is based on a certain selection policy. One or more suitable EMSs are found in the physical network management domain D1, such as EMSs with more resources, such as current storage, bandwidth, and computing, which are pulled by these EMSs (ie, DTS1 sends data to EMS1, EMS2 in the figure). EMS3) or media content is distributedly stored in these EMSs by way of content source push (ie, the content source sends data to EMS1, EMS2, EMS3 in the illustration). Step 302: After the media content is injected, the DTS issues the program to the Web Portal, and the user of the physical network management domain D1 can view the program information from the electronic program menu, and can select the program service, that is, the DTS1 sends data in the icon. Go to Web Portall. Step 303: The DTS in the physical network management domain D1 declares the program included in the physical network management domain D1 by means of multicast, DHT, and centralized, and the DTS of the other physical network management domain obtains the information and saves the information. The program is released, and users of other physical network management domains can view the program information from the electronic program menu, and can select the program service, that is, DTS2 sends data to Web Portal2, and DTS3 sends data to Web Portal3.

While the invention has been described in connection with the specific embodiments, the modifications and variations may be Such modifications and variations are considered to be within the scope of the invention and the scope of the appended claims.

Industrial Applicability The present invention provides a system and method for implementing streaming media content services. On the one hand, the edge media servers in the physical network management domain are connected in a P2P network topology, in particular, using a fully distributed structured topology. It solves the problem that the CDN system media capacity and user scale scalability is poor, reducing the bandwidth of the central node and the impact of single point failure on other nodes in the system; on the other hand, setting a centralized directory server ensures the node search time and ensures The quality of service. And, DTS and sharing.

Claims

Claim

A system for implementing a streaming media content service, comprising: at least one physical network management domain, each physical network management domain being connected by a communication network; and a physical network management domain comprising: at least one edge media server, configured as: a storage medium Content, and providing media services to the client, the edge media servers are connected in a peer network topology in the physical network management domain; and a domain directory server, configured to: store the edge media of the physical network management domain The media content information saved by the server provides a media query service for the edge media server; the domain directory server of each physical network management domain is connected in a network topology manner in the system.

2. The system for implementing a streaming media content service according to claim 1, wherein: the domain directory server is further configured to: store media content information in a domain directory server of another physical network management domain, which is within the physical network management domain. The Edge Media Server provides cross-domain media query services.

3. The system for implementing a streaming media content service according to claim 1 or 2, wherein: each edge media server in the physical network management domain is fully distributed, and the centralized supplementary mode, the intra-edge edge media server Provide media query services to other edge media servers by means of distributed hash tables.

The system for implementing a streaming media content service according to claim 3, wherein: the physical network management domain further comprises: a media publishing unit, configured to: receive a media publishing request of the domain directory server in the domain, and publish the media in the domain Program information.

5. A method for implementing a streaming media content service, comprising the following process: an edge media server receiving a media content lookup request of a client of a user area; searching an edge media server storing the target media content in the domain; Redirect to the edge media server where the target media content is stored.

6. The method of implementing a streaming media content service according to claim 5, wherein: After the edge media server storing the target media content is searched, before the client is redirected, the method further includes the following process: detecting a quality of service parameter of each edge media server storing the target media content, and selecting a high quality of service parameter The Edge Media Server acts as a client to redirect the target server.

The method for implementing a streaming media content service according to claim 5 or 6, wherein: the process of searching for an edge media server in the domain includes: searching for other edge media servers in the domain by using a distributed hash table. If there is target media content, if the edge media server containing the target media content is not found within the specified service quality requirement, the edge media server storing the target media content is searched for the domain directory server in the domain.

8. The method for implementing a streaming media content service according to claim 7, wherein: the method further comprises the following process: the cross-domain domain directory servers include: multicast, distributed hash table, and concentration One way to interact with media content information.

The method for implementing a streaming media content service according to claim 5 or 6 or 8, wherein: in the process of searching for an edge media server storing the target media content in the domain, if the edge storing the target media content is not found The media server, the method further includes the following process: searching for a cross-domain process of storing the edge media server with the target media content.

10. The method for implementing a streaming media content service according to claim 9, wherein: the process of searching for an edge media server storing the target media content across the domain comprises: searching for the stored target media across domains through the domain directory server in the domain The domain directory server of the physical network management domain of the content; finds the edge media server where the target media content is stored by the domain directory server across the domain.